Android开发常用的工具类集合
2017-08-13 18:56
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本文出自【张鸿洋的博客】:http://blog.csdn.net/lmj623565791/article/details/38965311打开大家手上的项目,基本都会有一大批的辅助类,今天特此整理出10个基本每个项目中都会使用的工具类,用于快速开发~~
在此感谢群里给我发项目中工具类的兄弟/姐妹~
import android.util.Log;
/**
* Log统一管理类
*
*
*
*/
public class L
{
private L()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
public static boolean isDebug = true;// 是否需要打印bug,可以在application的onCreate函数里面初始化
private static final String TAG = “way”;
// 下面四个是默认tag的函数
public static void i(String msg)
{
if (isDebug)
Log.i(TAG, msg);
}
public static void d(String msg)
{
if (isDebug)
Log.d(TAG, msg);
}
public static void e(String msg)
{
if (isDebug)
Log.e(TAG, msg);
}
public static void v(String msg)
{
if (isDebug)
Log.v(TAG, msg);
}
// 下面是传入自定义tag的函数
public static void i(String tag, String msg)
{
if (isDebug)
Log.i(tag, msg);
}
public static void d(String tag, String msg)
{
if (isDebug)
Log.i(tag, msg);
4000
}
public static void e(String tag, String msg)
{
if (isDebug)
Log.i(tag, msg);
}
public static void v(String tag, String msg)
{
if (isDebug)
Log.i(tag, msg);
}
}
网上看到的类,注释上应该原创作者的名字,很简单的一个类;网上也有很多提供把日志记录到SDCard上的,不过我是从来没记录过,所以引入个最简单的,大家可以进行评价是否需要扩充~~
import android.content.Context;
import android.widget.Toast;
/**
* Toast统一管理类
*
*/
public class T
{
private T()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
public static boolean isShow = true;
/**
* 短时间显示Toast
*
* @param context
* @param message
*/
public static void showShort(Context context, CharSequence message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
}
/**
* 短时间显示Toast
*
* @param context
* @param message
*/
public static void showShort(Context context, int message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
}
/**
* 长时间显示Toast
*
* @param context
* @param message
*/
public static void showLong(Context context, CharSequence message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
/**
* 长时间显示Toast
*
* @param context
* @param message
*/
public static void showLong(Context context, int message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
/**
* 自定义显示Toast时间
*
* @param context
* @param message
* @param duration
*/
public static void show(Context context, CharSequence message, int duration)
{
if (isShow)
Toast.makeText(context, message, duration).show();
}
/**
* 自定义显示Toast时间
*
* @param context
* @param message
* @param duration
*/
public static void show(Context context, int message, int duration)
{
if (isShow)
Toast.makeText(context, message, duration).show();
}
}
也是非常简单的一个封装,能省则省了~~
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
import android.content.Context;
import android.content.SharedPreferences;
public class SPUtils
{
/**
* 保存在手机里面的文件名
*/
public static final String FILE_NAME = “share_data”;
/**
* 保存数据的方法,我们需要拿到保存数据的具体类型,然后根据类型调用不同的保存方法
*
* @param context
* @param key
* @param object
*/
public static void put(Context context, String key, Object object)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
if (object instanceof String)
{
editor.putString(key, (String) object);
} else if (object instanceof Integer)
{
editor.putInt(key, (Integer) object);
} else if (object instanceof Boolean)
{
editor.putBoolean(key, (Boolean) object);
} else if (object instanceof Float)
{
editor.putFloat(key, (Float) object);
} else if (object instanceof Long)
{
editor.putLong(key, (Long) object);
} else
{
editor.putString(key, object.toString());
}
SharedPreferencesCompat.apply(editor);
}
/**
* 得到保存数据的方法,我们根据默认值得到保存的数据的具体类型,然后调用相对于的方法获取值
*
* @param context
* @param key
* @param defaultObject
* @return
*/
public static Object get(Context context, String key, Object defaultObject)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
if (defaultObject instanceof String)
{
return sp.getString(key, (String) defaultObject);
} else if (defaultObject instanceof Integer)
{
return sp.getInt(key, (Integer) defaultObject);
} else if (defaultObject instanceof Boolean)
{
return sp.getBoolean(key, (Boolean) defaultObject);
} else if (defaultObject instanceof Float)
{
return sp.getFloat(key, (Float) defaultObject);
} else if (defaultObject instanceof Long)
{
return sp.getLong(key, (Long) defaultObject);
}
return null;
}
/**
* 移除某个key值已经对应的值
* @param context
* @param key
*/
public static void remove(Context context, String key)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.remove(key);
SharedPreferencesCompat.apply(editor);
}
/**
* 清除所有数据
* @param context
*/
public static void clear(Context context)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.clear();
SharedPreferencesCompat.apply(editor);
}
/**
* 查询某个key是否已经存在
* @param context
* @param key
* @return
*/
public static boolean contains(Context context, String key)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
return sp.contains(key);
}
/**
* 返回所有的键值对
*
* @param context
* @return
*/
public static Map<String, ?> getAll(Context context)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
return sp.getAll();
}
/**
* 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
*
* @author zhy
*
*/
private static class SharedPreferencesCompat
{
private static final Method sApplyMethod = findApplyMethod();
/**
* 反射查找apply的方法
*
* @return
*/
@SuppressWarnings({ “unchecked”, “rawtypes” })
private static Method findApplyMethod()
{
try
{
Class clz = SharedPreferences.Editor.class;
return clz.getMethod(“apply”);
} catch (NoSuchMethodException e)
{
}
return null;
}
/**
* 如果找到则使用apply执行,否则使用commit
*
* @param editor
*/
public static void apply(SharedPreferences.Editor editor)
{
try
{
if (sApplyMethod != null)
{
sApplyMethod.invoke(editor);
return;
}
} catch (IllegalArgumentException e)
{
} catch (IllegalAccessException e)
{
} catch (InvocationTargetException e)
{
}
editor.commit();
}
}
}
对SharedPreference的使用做了建议的封装,对外公布出put,get,remove,clear等等方法;
注意一点,里面所有的commit操作使用了SharedPreferencesCompat.apply进行了替代,目的是尽可能的使用apply代替commit
首先说下为什么,因为commit方法是同步的,并且我们很多时候的commit操作都是UI线程中,毕竟是IO操作,尽可能异步;
所以我们使用apply进行替代,apply异步的进行写入;
但是apply相当于commit来说是new API呢,为了更好的兼容,我们做了适配;
SharedPreferencesCompat也可以给大家创建兼容类提供了一定的参考~~
import android.content.Context;
import android.util.TypedValue;
/**
* 常用单位转换的辅助类
*
*
*
*/
public class DensityUtils
{
private DensityUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
/**
* dp转px
*
* @param context
* @param val
* @return
*/
public static int dp2px(Context context, float dpVal)
{
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
dpVal, context.getResources().getDisplayMetrics());
}
/**
* sp转px
*
* @param context
* @param val
* @return
*/
public static int sp2px(Context context, float spVal)
{
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
spVal, context.getResources().getDisplayMetrics());
}
/**
* px转dp
*
* @param context
* @param pxVal
* @return
*/
public static float px2dp(Context context, float pxVal)
{
final float scale = context.getResources().getDisplayMetrics().density;
return (pxVal / scale);
}
/**
* px转sp
*
* @param fontScale
* @param pxVal
* @return
*/
public static float px2sp(Context context, float pxVal)
{
return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
}
}
import java.io.File;
import android.os.Environment;
import android.os.StatFs;
/**
* SD卡相关的辅助类
*
*
*
*/
public class SDCardUtils
{
private SDCardUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
/**
* 判断SDCard是否可用
*
* @return
*/
public static boolean isSDCardEnable()
{
return Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED);
}
/**
* 获取SD卡路径
*
* @return
*/
public static String getSDCardPath()
{
return Environment.getExternalStorageDirectory().getAbsolutePath()
+ File.separator;
}
/**
* 获取SD卡的剩余容量 单位byte
*
* @return
*/
public static long getSDCardAllSize()
{
if (isSDCardEnable())
{
StatFs stat = new StatFs(getSDCardPath());
// 获取空闲的数据块的数量
long availableBlocks = (long) stat.getAvailableBlocks() - 4;
// 获取单个数据块的大小(byte)
long freeBlocks = stat.getAvailableBlocks();
return freeBlocks * availableBlocks;
}
return 0;
}
/**
* 获取指定路径所在空间的剩余可用容量字节数,单位byte
*
* @param filePath
* @return 容量字节 SDCard可用空间,内部存储可用空间
*/
public static long getFreeBytes(String filePath)
{
// 如果是sd卡的下的路径,则获取sd卡可用容量
if (filePath.startsWith(getSDCardPath()))
{
filePath = getSDCardPath();
} else
{// 如果是内部存储的路径,则获取内存存储的可用容量
filePath = Environment.getDataDirectory().getAbsolutePath();
}
StatFs stat = new StatFs(filePath);
long availableBlocks = (long) stat.getAvailableBlocks() - 4;
return stat.getBlockSize() * availableBlocks;
}
/**
* 获取系统存储路径
*
* @return
*/
public static String getRootDirectoryPath()
{
return Environment.getRootDirectory().getAbsolutePath();
}
}
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;
/**
* 获得屏幕相关的辅助类
*
*
*
*/
public class ScreenUtils
{
private ScreenUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
/**
* 获得屏幕高度
*
* @param context
* @return
*/
public static int getScreenWidth(Context context)
{
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.widthPixels;
}
/**
* 获得屏幕宽度
*
* @param context
* @return
*/
public static int getScreenHeight(Context context)
{
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.heightPixels;
}
/**
* 获得状态栏的高度
*
* @param context
* @return
*/
public static int getStatusHeight(Context context)
{
int statusHeight = -1;
try
{
Class<?> clazz = Class.forName(”com.android.internal.R$dimen”);
Object object = clazz.newInstance();
int height = Integer.parseInt(clazz.getField(“status_bar_height”)
.get(object).toString());
statusHeight = context.getResources().getDimensionPixelSize(height);
} catch (Exception e)
{
e.printStackTrace();
}
return statusHeight;
}
/**
* 获取当前屏幕截图,包含状态栏
*
* @param activity
* @return
*/
public static Bitmap snapShotWithStatusBar(Activity activity)
{
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
int width = getScreenWidth(activity);
int height = getScreenHeight(activity);
Bitmap bp = null;
bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
view.destroyDrawingCache();
return bp;
}
/**
* 获取当前屏幕截图,不包含状态栏
*
* @param activity
* @return
*/
public static Bitmap snapShotWithoutStatusBar(Activity activity)
{
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
Rect frame = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
int width = getScreenWidth(activity);
int height = getScreenHeight(activity);
Bitmap bp = null;
bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
- statusBarHeight);
view.destroyDrawingCache();
return bp;
}
}
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
/**
* 跟App相关的辅助类
*
*
*
*/
public class AppUtils
{
private AppUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
/**
* 获取应用程序名称
*/
public static String getAppName(Context context)
{
try
{
PackageManager packageManager = context.getPackageManager();
PackageInfo packageInfo = packageManager.getPackageInfo(
context.getPackageName(), 0);
int labelRes = packageInfo.applicationInfo.labelRes;
return context.getResources().getString(labelRes);
} catch (NameNotFoundException e)
{
e.printStackTrace();
}
return null;
}
/**
* [获取应用程序版本名称信息]
*
* @param context
* @return 当前应用的版本名称
*/
public static String getVersionName(Context context)
{
try
{
PackageManager packageManager = context.getPackageManager();
PackageInfo packageInfo = packageManager.getPackageInfo(
context.getPackageName(), 0);
return packageInfo.versionName;
} catch (NameNotFoundException e)
{
e.printStackTrace();
}
return null;
}
}
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
/**
* 跟网络相关的工具类
*
*
*
*/
public class NetUtils
{
private NetUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
/**
* 判断网络是否连接
*
* @param context
* @return
*/
public static boolean isConnected(Context context)
{
ConnectivityManager connectivity = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (null != connectivity)
{
NetworkInfo info = connectivity.getActiveNetworkInfo();
if (null != info && info.isConnected())
{
if (info.getState() == NetworkInfo.State.CONNECTED)
{
return true;
}
}
}
return false;
}
/**
* 判断是否是wifi连接
*/
public static boolean isWifi(Context context)
{
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (cm == null)
return false;
return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;
}
/**
* 打开网络设置界面
*/
public static void openSetting(Activity activity)
{
Intent intent = new Intent(“/”);
ComponentName cm = new ComponentName(“com.android.settings”,
”com.android.settings.WirelessSettings”);
intent.setComponent(cm);
intent.setAction(”android.intent.action.VIEW”);
activity.startActivityForResult(intent, 0);
}
}
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
/**
* Http请求的工具类
*
* @author zhy
*
*/
public class HttpUtils
{
private static final int TIMEOUT_IN_MILLIONS = 5000;
public interface CallBack
{
void onRequestComplete(String result);
}
/**
* 异步的Get请求
*
* @param urlStr
* @param callBack
*/
public static void doGetAsyn(final String urlStr, final CallBack callBack)
{
new Thread()
{
public void run()
{
try
{
String result = doGet(urlStr);
if (callBack != null)
{
callBack.onRequestComplete(result);
}
} catch (Exception e)
{
e.printStackTrace();
}
};
}.start();
}
/**
* 异步的Post请求
* @param urlStr
* @param params
* @param callBack
* @throws Exception
*/
public static void doPostAsyn(final String urlStr, final String params,
final CallBack callBack) throws Exception
{
new Thread()
{
public void run()
{
try
{
String result = doPost(urlStr, params);
if (callBack != null)
{
callBack.onRequestComplete(result);
}
} catch (Exception e)
{
e.printStackTrace();
}
};
}.start();
}
/**
* Get请求,获得返回数据
*
* @param urlStr
* @return
* @throws Exception
*/
public static String doGet(String urlStr)
{
URL url = null;
HttpURLConnection conn = null;
InputStream is = null;
ByteArrayOutputStream baos = null;
try
{
url = new URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
conn.setRequestMethod(”GET”);
conn.setRequestProperty(”accept”, “*/*”);
conn.setRequestProperty(”connection”, “Keep-Alive”);
if (conn.getResponseCode() == 200)
{
is = conn.getInputStream();
baos = new ByteArrayOutputStream();
int len = -1;
byte[] buf = new byte[128];
while ((len = is.read(buf)) != -1)
{
baos.write(buf, 0, len);
}
baos.flush();
return baos.toString();
} else
{
throw new RuntimeException(“ responseCode is not 200 … ”);
}
} catch (Exception e)
{
e.printStackTrace();
} finally
{
try
{
if (is != null)
is.close();
} catch (IOException e)
{
}
try
{
if (baos != null)
baos.close();
} catch (IOException e)
{
}
conn.disconnect();
}
return null ;
}
/**
* 向指定 URL 发送POST方法的请求
*
* @param url
* 发送请求的 URL
* @param param
* 请求参数,请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
* @throws Exception
*/
public static String doPost(String url, String param)
{
PrintWriter out = null;
BufferedReader in = null;
String result = ”“;
try
{
URL realUrl = new URL(url);
// 打开和URL之间的连接
HttpURLConnection conn = (HttpURLConnection) realUrl
.openConnection();
// 设置通用的请求属性
conn.setRequestProperty(”accept”, “*/*”);
conn.setRequestProperty(”connection”, “Keep-Alive”);
conn.setRequestMethod(”POST”);
conn.setRequestProperty(”Content-Type”,
”application/x-www-form-urlencoded”);
conn.setRequestProperty(”charset”, “utf-8”);
conn.setUseCaches(false);
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
if (param != null && !param.trim().equals(“”))
{
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
}
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null)
{
result += line;
}
} catch (Exception e)
{
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally
{
try
{
if (out != null)
{
out.close();
}
if (in != null)
{
in.close();
}
} catch (IOException ex)
{
ex.printStackTrace();
}
}
return result;
}
}
如果大家在使用过程中出现什么错误,或者有更好的建议,欢迎大家留言提出~~可以不断的改进这些类~
源码点击下载
在此感谢群里给我发项目中工具类的兄弟/姐妹~
1、日志工具类L.java
[java] view plain copy print?package com.zhy.utils;import android.util.Log;
/**
* Log统一管理类
*
*
*
*/
public class L
{
private L()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
public static boolean isDebug = true;// 是否需要打印bug,可以在application的onCreate函数里面初始化
private static final String TAG = “way”;
// 下面四个是默认tag的函数
public static void i(String msg)
{
if (isDebug)
Log.i(TAG, msg);
}
public static void d(String msg)
{
if (isDebug)
Log.d(TAG, msg);
}
public static void e(String msg)
{
if (isDebug)
Log.e(TAG, msg);
}
public static void v(String msg)
{
if (isDebug)
Log.v(TAG, msg);
}
// 下面是传入自定义tag的函数
public static void i(String tag, String msg)
{
if (isDebug)
Log.i(tag, msg);
}
public static void d(String tag, String msg)
{
if (isDebug)
Log.i(tag, msg);
4000
}
public static void e(String tag, String msg)
{
if (isDebug)
Log.i(tag, msg);
}
public static void v(String tag, String msg)
{
if (isDebug)
Log.i(tag, msg);
}
}
package com.zhy.utils; import android.util.Log; /** * Log统一管理类 * * * */ public class L { private L() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } public static boolean isDebug = true;// 是否需要打印bug,可以在application的onCreate函数里面初始化 private static final String TAG = "way"; // 下面四个是默认tag的函数 public static void i(String msg) { if (isDebug) Log.i(TAG, msg); } public static void d(String msg) { if (isDebug) Log.d(TAG, msg); } public static void e(String msg) { if (isDebug) Log.e(TAG, msg); } public static void v(String msg) { if (isDebug) Log.v(TAG, msg); } // 下面是传入自定义tag的函数 public static void i(String tag, String msg) { if (isDebug) Log.i(tag, msg); } public static void d(String tag, String msg) { if (isDebug) Log.i(tag, msg); } public static void e(String tag, String msg) { if (isDebug) Log.i(tag, msg); } public static void v(String tag, String msg) { if (isDebug) Log.i(tag, msg); } }
网上看到的类,注释上应该原创作者的名字,很简单的一个类;网上也有很多提供把日志记录到SDCard上的,不过我是从来没记录过,所以引入个最简单的,大家可以进行评价是否需要扩充~~
2、Toast统一管理类
[java] view plain copy print?package com.zhy.utils;import android.content.Context;
import android.widget.Toast;
/**
* Toast统一管理类
*
*/
public class T
{
private T()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
public static boolean isShow = true;
/**
* 短时间显示Toast
*
* @param context
* @param message
*/
public static void showShort(Context context, CharSequence message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
}
/**
* 短时间显示Toast
*
* @param context
* @param message
*/
public static void showShort(Context context, int message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
}
/**
* 长时间显示Toast
*
* @param context
* @param message
*/
public static void showLong(Context context, CharSequence message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
/**
* 长时间显示Toast
*
* @param context
* @param message
*/
public static void showLong(Context context, int message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
/**
* 自定义显示Toast时间
*
* @param context
* @param message
* @param duration
*/
public static void show(Context context, CharSequence message, int duration)
{
if (isShow)
Toast.makeText(context, message, duration).show();
}
/**
* 自定义显示Toast时间
*
* @param context
* @param message
* @param duration
*/
public static void show(Context context, int message, int duration)
{
if (isShow)
Toast.makeText(context, message, duration).show();
}
}
package com.zhy.utils; import android.content.Context; import android.widget.Toast; /** * Toast统一管理类 * */ public class T { private T() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } public static boolean isShow = true; /** * 短时间显示Toast * * @param context * @param message */ public static void showShort(Context context, CharSequence message) { if (isShow) Toast.makeText(context, message, Toast.LENGTH_SHORT).show(); } /** * 短时间显示Toast * * @param context * @param message */ public static void showShort(Context context, int message) { if (isShow) Toast.makeText(context, message, Toast.LENGTH_SHORT).show(); } 20000 /** * 长时间显示Toast * * @param context * @param message */ public static void showLong(Context context, CharSequence message) { if (isShow) Toast.makeText(context, message, Toast.LENGTH_LONG).show(); } /** * 长时间显示Toast * * @param context * @param message */ public static void showLong(Context context, int message) { if (isShow) Toast.makeText(context, message, Toast.LENGTH_LONG).show(); } /** * 自定义显示Toast时间 * * @param context * @param message * @param duration */ public static void show(Context context, CharSequence message, int duration) { if (isShow) Toast.makeText(context, message, duration).show(); } /** * 自定义显示Toast时间 * * @param context * @param message * @param duration */ public static void show(Context context, int message, int duration) { if (isShow) Toast.makeText(context, message, duration).show(); } }
也是非常简单的一个封装,能省则省了~~
3、SharedPreferences封装类SPUtils
[java] view plain copy print?package com.zhy.utils;import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
import android.content.Context;
import android.content.SharedPreferences;
public class SPUtils
{
/**
* 保存在手机里面的文件名
*/
public static final String FILE_NAME = “share_data”;
/**
* 保存数据的方法,我们需要拿到保存数据的具体类型,然后根据类型调用不同的保存方法
*
* @param context
* @param key
* @param object
*/
public static void put(Context context, String key, Object object)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
if (object instanceof String)
{
editor.putString(key, (String) object);
} else if (object instanceof Integer)
{
editor.putInt(key, (Integer) object);
} else if (object instanceof Boolean)
{
editor.putBoolean(key, (Boolean) object);
} else if (object instanceof Float)
{
editor.putFloat(key, (Float) object);
} else if (object instanceof Long)
{
editor.putLong(key, (Long) object);
} else
{
editor.putString(key, object.toString());
}
SharedPreferencesCompat.apply(editor);
}
/**
* 得到保存数据的方法,我们根据默认值得到保存的数据的具体类型,然后调用相对于的方法获取值
*
* @param context
* @param key
* @param defaultObject
* @return
*/
public static Object get(Context context, String key, Object defaultObject)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
if (defaultObject instanceof String)
{
return sp.getString(key, (String) defaultObject);
} else if (defaultObject instanceof Integer)
{
return sp.getInt(key, (Integer) defaultObject);
} else if (defaultObject instanceof Boolean)
{
return sp.getBoolean(key, (Boolean) defaultObject);
} else if (defaultObject instanceof Float)
{
return sp.getFloat(key, (Float) defaultObject);
} else if (defaultObject instanceof Long)
{
return sp.getLong(key, (Long) defaultObject);
}
return null;
}
/**
* 移除某个key值已经对应的值
* @param context
* @param key
*/
public static void remove(Context context, String key)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.remove(key);
SharedPreferencesCompat.apply(editor);
}
/**
* 清除所有数据
* @param context
*/
public static void clear(Context context)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.clear();
SharedPreferencesCompat.apply(editor);
}
/**
* 查询某个key是否已经存在
* @param context
* @param key
* @return
*/
public static boolean contains(Context context, String key)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
return sp.contains(key);
}
/**
* 返回所有的键值对
*
* @param context
* @return
*/
public static Map<String, ?> getAll(Context context)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
return sp.getAll();
}
/**
* 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
*
* @author zhy
*
*/
private static class SharedPreferencesCompat
{
private static final Method sApplyMethod = findApplyMethod();
/**
* 反射查找apply的方法
*
* @return
*/
@SuppressWarnings({ “unchecked”, “rawtypes” })
private static Method findApplyMethod()
{
try
{
Class clz = SharedPreferences.Editor.class;
return clz.getMethod(“apply”);
} catch (NoSuchMethodException e)
{
}
return null;
}
/**
* 如果找到则使用apply执行,否则使用commit
*
* @param editor
*/
public static void apply(SharedPreferences.Editor editor)
{
try
{
if (sApplyMethod != null)
{
sApplyMethod.invoke(editor);
return;
}
} catch (IllegalArgumentException e)
{
} catch (IllegalAccessException e)
{
} catch (InvocationTargetException e)
{
}
editor.commit();
}
}
}
package com.zhy.utils; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.Map; import android.content.Context; import android.content.SharedPreferences; public class SPUtils { /** * 保存在手机里面的文件名 */ public static final String FILE_NAME = "share_data"; /** * 保存数据的方法,我们需要拿到保存数据的具体类型,然后根据类型调用不同的保存方法 * * @param context * @param key * @param object */ public static void put(Context context, String key, Object object) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); if (object instanceof String) { editor.putString(key, (String) object); } else if (object instanceof Integer) { editor.putInt(key, (Integer) object); } else if (object instanceof Boolean) { editor.putBoolean(key, (Boolean) object); } else if (object instanceof Float) { editor.putFloat(key, (Float) object); } else if (object instanceof Long) { editor.putLong(key, (Long) object); } else { editor.putString(key, object.toString()); } SharedPreferencesCompat.apply(editor); } /** * 得到保存数据的方法,我们根据默认值得到保存的数据的具体类型,然后调用相对于的方法获取值 * * @param context * @param key * @param defaultObject * @return */ public static Object get(Context context, String key, Object defaultObject) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); if (defaultObject instanceof String) { return sp.getString(key, (String) defaultObject); } else if (defaultObject instanceof Integer) { return sp.getInt(key, (Integer) defaultObject); } else if (defaultObject instanceof Boolean) { return sp.getBoolean(key, (Boolean) defaultObject); } else if (defaultObject instanceof Float) { return sp.getFloat(key, (Float) defaultObject); } else if (defaultObject instanceof Long) { return sp.getLong(key, (Long) defaultObject); } return null; } /** * 移除某个key值已经对应的值 * @param context * @param key */ public static void remove(Context context, String key) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); editor.remove(key); SharedPreferencesCompat.apply(editor); } /** * 清除所有数据 * @param context */ public static void clear(Context context) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); editor.clear(); SharedPreferencesCompat.apply(editor); } /** * 查询某个key是否已经存在 * @param context * @param key * @return */ public static boolean contains(Context context, String key) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); return sp.contains(key); } /** * 返回所有的键值对 * * @param context * @return */ public static Map<String, ?> getAll(Context context) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); return sp.getAll(); } /** * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类 * * @author zhy * */ private static class SharedPreferencesCompat { private static final Method sApplyMethod = findApplyMethod(); /** * 反射查找apply的方法 * * @return */ @SuppressWarnings({ "unchecked", "rawtypes" }) private static Method findApplyMethod() { try { Class clz = SharedPreferences.Editor.class; return clz.getMethod("apply"); } catch (NoSuchMethodException e) { } return null; } /** * 如果找到则使用apply执行,否则使用commit * * @param editor */ public static void apply(SharedPreferences.Editor editor) { try { if (sApplyMethod != null) { sApplyMethod.invoke(editor); return; } } catch (IllegalArgumentException e) { } catch (IllegalAccessException e) { } catch (InvocationTargetException e) { } editor.commit(); } } }
对SharedPreference的使用做了建议的封装,对外公布出put,get,remove,clear等等方法;
注意一点,里面所有的commit操作使用了SharedPreferencesCompat.apply进行了替代,目的是尽可能的使用apply代替commit
首先说下为什么,因为commit方法是同步的,并且我们很多时候的commit操作都是UI线程中,毕竟是IO操作,尽可能异步;
所以我们使用apply进行替代,apply异步的进行写入;
但是apply相当于commit来说是new API呢,为了更好的兼容,我们做了适配;
SharedPreferencesCompat也可以给大家创建兼容类提供了一定的参考~~
4、单位转换类 DensityUtils
[java] view plain copy print?package com.zhy.utils;import android.content.Context;
import android.util.TypedValue;
/**
* 常用单位转换的辅助类
*
*
*
*/
public class DensityUtils
{
private DensityUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
/**
* dp转px
*
* @param context
* @param val
* @return
*/
public static int dp2px(Context context, float dpVal)
{
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
dpVal, context.getResources().getDisplayMetrics());
}
/**
* sp转px
*
* @param context
* @param val
* @return
*/
public static int sp2px(Context context, float spVal)
{
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
spVal, context.getResources().getDisplayMetrics());
}
/**
* px转dp
*
* @param context
* @param pxVal
* @return
*/
public static float px2dp(Context context, float pxVal)
{
final float scale = context.getResources().getDisplayMetrics().density;
return (pxVal / scale);
}
/**
* px转sp
*
* @param fontScale
* @param pxVal
* @return
*/
public static float px2sp(Context context, float pxVal)
{
return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
}
}
package com.zhy.utils; import android.content.Context; import android.util.TypedValue; /** * 常用单位转换的辅助类 * * * */ public class DensityUtils { private DensityUtils() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } /** * dp转px * * @param context * @param val * @return */ public static int dp2px(Context context, float dpVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, context.getResources().getDisplayMetrics()); } /** * sp转px * * @param context * @param val * @return */ public static int sp2px(Context context, float spVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spVal, context.getResources().getDisplayMetrics()); } /** * px转dp * * @param context * @param pxVal * @return */ public static float px2dp(Context context, float pxVal) { final float scale = context.getResources().getDisplayMetrics().density; return (pxVal / scale); } /** * px转sp * * @param fontScale * @param pxVal * @return */ public static float px2sp(Context context, float pxVal) { return (pxVal / context.getResources().getDisplayMetrics().scaledDensity); } }
5、SD卡相关辅助类 SDCardUtils
[java] view plain copy print?package com.zhy.utils;import java.io.File;
import android.os.Environment;
import android.os.StatFs;
/**
* SD卡相关的辅助类
*
*
*
*/
public class SDCardUtils
{
private SDCardUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
/**
* 判断SDCard是否可用
*
* @return
*/
public static boolean isSDCardEnable()
{
return Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED);
}
/**
* 获取SD卡路径
*
* @return
*/
public static String getSDCardPath()
{
return Environment.getExternalStorageDirectory().getAbsolutePath()
+ File.separator;
}
/**
* 获取SD卡的剩余容量 单位byte
*
* @return
*/
public static long getSDCardAllSize()
{
if (isSDCardEnable())
{
StatFs stat = new StatFs(getSDCardPath());
// 获取空闲的数据块的数量
long availableBlocks = (long) stat.getAvailableBlocks() - 4;
// 获取单个数据块的大小(byte)
long freeBlocks = stat.getAvailableBlocks();
return freeBlocks * availableBlocks;
}
return 0;
}
/**
* 获取指定路径所在空间的剩余可用容量字节数,单位byte
*
* @param filePath
* @return 容量字节 SDCard可用空间,内部存储可用空间
*/
public static long getFreeBytes(String filePath)
{
// 如果是sd卡的下的路径,则获取sd卡可用容量
if (filePath.startsWith(getSDCardPath()))
{
filePath = getSDCardPath();
} else
{// 如果是内部存储的路径,则获取内存存储的可用容量
filePath = Environment.getDataDirectory().getAbsolutePath();
}
StatFs stat = new StatFs(filePath);
long availableBlocks = (long) stat.getAvailableBlocks() - 4;
return stat.getBlockSize() * availableBlocks;
}
/**
* 获取系统存储路径
*
* @return
*/
public static String getRootDirectoryPath()
{
return Environment.getRootDirectory().getAbsolutePath();
}
}
package com.zhy.utils; import java.io.File; import android.os.Environment; import android.os.StatFs; /** * SD卡相关的辅助类 * * * */ public class SDCardUtils { private SDCardUtils() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } /** * 判断SDCard是否可用 * * @return */ public static boolean isSDCardEnable() { return Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED); } /** * 获取SD卡路径 * * @return */ public static String getSDCardPath() { return Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator; } /** * 获取SD卡的剩余容量 单位byte * * @return */ public static long getSDCardAllSize() { if (isSDCardEnable()) { StatFs stat = new StatFs(getSDCardPath()); // 获取空闲的数据块的数量 long availableBlocks = (long) stat.getAvailableBlocks() - 4; // 获取单个数据块的大小(byte) long freeBlocks = stat.getAvailableBlocks(); return freeBlocks * availableBlocks; } return 0; } /** * 获取指定路径所在空间的剩余可用容量字节数,单位byte * * @param filePath * @return 容量字节 SDCard可用空间,内部存储可用空间 */ public static long getFreeBytes(String filePath) { // 如果是sd卡的下的路径,则获取sd卡可用容量 if (filePath.startsWith(getSDCardPath())) { filePath = getSDCardPath(); } else {// 如果是内部存储的路径,则获取内存存储的可用容量 filePath = Environment.getDataDirectory().getAbsolutePath(); } StatFs stat = new StatFs(filePath); long availableBlocks = (long) stat.getAvailableBlocks() - 4; return stat.getBlockSize() * availableBlocks; } /** * 获取系统存储路径 * * @return */ public static String getRootDirectoryPath() { return Environment.getRootDirectory().getAbsolutePath(); } }
6、屏幕相关辅助类 ScreenUtils
[java] view plain copy print?package com.zhy.utils;import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;
/**
* 获得屏幕相关的辅助类
*
*
*
*/
public class ScreenUtils
{
private ScreenUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
/**
* 获得屏幕高度
*
* @param context
* @return
*/
public static int getScreenWidth(Context context)
{
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.widthPixels;
}
/**
* 获得屏幕宽度
*
* @param context
* @return
*/
public static int getScreenHeight(Context context)
{
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.heightPixels;
}
/**
* 获得状态栏的高度
*
* @param context
* @return
*/
public static int getStatusHeight(Context context)
{
int statusHeight = -1;
try
{
Class<?> clazz = Class.forName(”com.android.internal.R$dimen”);
Object object = clazz.newInstance();
int height = Integer.parseInt(clazz.getField(“status_bar_height”)
.get(object).toString());
statusHeight = context.getResources().getDimensionPixelSize(height);
} catch (Exception e)
{
e.printStackTrace();
}
return statusHeight;
}
/**
* 获取当前屏幕截图,包含状态栏
*
* @param activity
* @return
*/
public static Bitmap snapShotWithStatusBar(Activity activity)
{
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
int width = getScreenWidth(activity);
int height = getScreenHeight(activity);
Bitmap bp = null;
bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
view.destroyDrawingCache();
return bp;
}
/**
* 获取当前屏幕截图,不包含状态栏
*
* @param activity
* @return
*/
public static Bitmap snapShotWithoutStatusBar(Activity activity)
{
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
Rect frame = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
int width = getScreenWidth(activity);
int height = getScreenHeight(activity);
Bitmap bp = null;
bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
- statusBarHeight);
view.destroyDrawingCache();
return bp;
}
}
package com.zhy.utils; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Rect; import android.util.DisplayMetrics; import android.view.View; import android.view.WindowManager; /** * 获得屏幕相关的辅助类 * * * */ public class ScreenUtils { private ScreenUtils() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } /** * 获得屏幕高度 * * @param context * @return */ public static int getScreenWidth(Context context) { WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); DisplayMetrics outMetrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(outMetrics); return outMetrics.widthPixels; } /** * 获得屏幕宽度 * * @param context * @return */ public static int getScreenHeight(Context context) { WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); DisplayMetrics outMetrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(outMetrics); return outMetrics.heightPixels; } /** * 获得状态栏的高度 * * @param context * @return */ public static int getStatusHeight(Context context) { int statusHeight = -1; try { Class<?> clazz = Class.forName("com.android.internal.R$dimen"); Object object = clazz.newInstance(); int height = Integer.parseInt(clazz.getField("status_bar_height") .get(object).toString()); statusHeight = context.getResources().getDimensionPixelSize(height); } catch (Exception e) { e.printStackTrace(); } return statusHeight; } /** * 获取当前屏幕截图,包含状态栏 * * @param activity * @return */ public static Bitmap snapShotWithStatusBar(Activity activity) { View view = activity.getWindow().getDecorView(); view.setDrawingCacheEnabled(true); view.buildDrawingCache(); Bitmap bmp = view.getDrawingCache(); int width = getScreenWidth(activity); int height = getScreenHeight(activity); Bitmap bp = null; bp = Bitmap.createBitmap(bmp, 0, 0, width, height); view.destroyDrawingCache(); return bp; } /** * 获取当前屏幕截图,不包含状态栏 * * @param activity * @return */ public static Bitmap snapShotWithoutStatusBar(Activity activity) { View view = activity.getWindow().getDecorView(); view.setDrawingCacheEnabled(true); view.buildDrawingCache(); Bitmap bmp = view.getDrawingCache(); Rect frame = new Rect(); activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); int statusBarHeight = frame.top; int width = getScreenWidth(activity); int height = getScreenHeight(activity); Bitmap bp = null; bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height - statusBarHeight); view.destroyDrawingCache(); return bp; } }
7、App相关辅助类
[java] view plain copy print?package com.zhy.utils;import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
/**
* 跟App相关的辅助类
*
*
*
*/
public class AppUtils
{
private AppUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
/**
* 获取应用程序名称
*/
public static String getAppName(Context context)
{
try
{
PackageManager packageManager = context.getPackageManager();
PackageInfo packageInfo = packageManager.getPackageInfo(
context.getPackageName(), 0);
int labelRes = packageInfo.applicationInfo.labelRes;
return context.getResources().getString(labelRes);
} catch (NameNotFoundException e)
{
e.printStackTrace();
}
return null;
}
/**
* [获取应用程序版本名称信息]
*
* @param context
* @return 当前应用的版本名称
*/
public static String getVersionName(Context context)
{
try
{
PackageManager packageManager = context.getPackageManager();
PackageInfo packageInfo = packageManager.getPackageInfo(
context.getPackageName(), 0);
return packageInfo.versionName;
} catch (NameNotFoundException e)
{
e.printStackTrace();
}
return null;
}
}
package com.zhy.utils; import android.content.Context; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.content.pm.PackageManager.NameNotFoundException; /** * 跟App相关的辅助类 * * * */ public class AppUtils { private AppUtils() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } /** * 获取应用程序名称 */ public static String getAppName(Context context) { try { PackageManager packageManager = context.getPackageManager(); PackageInfo packageInfo = packageManager.getPackageInfo( context.getPackageName(), 0); int labelRes = packageInfo.applicationInfo.labelRes; return context.getResources().getString(labelRes); } catch (NameNotFoundException e) { e.printStackTrace(); } return null; } /** * [获取应用程序版本名称信息] * * @param context * @return 当前应用的版本名称 */ public static String getVersionName(Context context) { try { PackageManager packageManager = context.getPackageManager(); PackageInfo packageInfo = packageManager.getPackageInfo( context.getPackageName(), 0); return packageInfo.versionName; } catch (NameNotFoundException e) { e.printStackTrace(); } return null; } }
8、软键盘相关辅助类KeyBoardUtils
[java] view plain copy print?package com.zhy.utils; import android.content.Context; import android.view.inputmethod.InputMethodManager; import android.widget.EditText; /** * 打开或关闭软键盘 * * @author zhy * */ public class KeyBoardUtils { /** * 打卡软键盘 * * @param mEditText * 输入框 * @param mContext * 上下文 */ public static void openKeybord(EditText mEditText, Context mContext) { InputMethodManager imm = (InputMethodManager) mContext .getSystemService(Context.INPUT_METHOD_SERVICE); imm.showSoftInput(mEditText, InputMethodManager.RESULT_SHOWN); imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY); } /** * 关闭软键盘 * * @param mEditText * 输入框 * @param mContext * 上下文 */ public static void closeKeybord(EditText mEditText, Context mContext) { InputMethodManager imm = (InputMethodManager) mContext .getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(mEditText.getWindowToken(), 0); } }package com.zhy.utils; import android.content.Context; import android.view.inputmethod.InputMethodManager; import android.widget.EditText; /** * 打开或关闭软键盘 * * @author zhy * */ public class KeyBoardUtils { /** * 打卡软键盘 * * @param mEditText * 输入框 * @param mContext * 上下文 */ public static void openKeybord(EditText mEditText, Context mContext) { InputMethodManager imm = (InputMethodManager) mContext .getSystemService(Context.INPUT_METHOD_SERVICE); imm.showSoftInput(mEditText, InputMethodManager.RESULT_SHOWN); imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY); } /** * 关闭软键盘 * * @param mEditText * 输入框 * @param mContext * 上下文 */ public static void closeKeybord(EditText mEditText, Context mContext) { InputMethodManager imm = (InputMethodManager) mContext .getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(mEditText.getWindowToken(), 0); } }
9、网络相关辅助类 NetUtils
[java] view plain copy print?package com.zhy.utils;import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
/**
* 跟网络相关的工具类
*
*
*
*/
public class NetUtils
{
private NetUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException(“cannot be instantiated”);
}
/**
* 判断网络是否连接
*
* @param context
* @return
*/
public static boolean isConnected(Context context)
{
ConnectivityManager connectivity = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (null != connectivity)
{
NetworkInfo info = connectivity.getActiveNetworkInfo();
if (null != info && info.isConnected())
{
if (info.getState() == NetworkInfo.State.CONNECTED)
{
return true;
}
}
}
return false;
}
/**
* 判断是否是wifi连接
*/
public static boolean isWifi(Context context)
{
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (cm == null)
return false;
return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;
}
/**
* 打开网络设置界面
*/
public static void openSetting(Activity activity)
{
Intent intent = new Intent(“/”);
ComponentName cm = new ComponentName(“com.android.settings”,
”com.android.settings.WirelessSettings”);
intent.setComponent(cm);
intent.setAction(”android.intent.action.VIEW”);
activity.startActivityForResult(intent, 0);
}
}
package com.zhy.utils; import android.app.Activity; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.net.ConnectivityManager; import android.net.NetworkInfo; /** * 跟网络相关的工具类 * * * */ public class NetUtils { private NetUtils() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } /** * 判断网络是否连接 * * @param context * @return */ public static boolean isConnected(Context context) { ConnectivityManager connectivity = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); if (null != connectivity) { NetworkInfo info = connectivity.getActiveNetworkInfo(); if (null != info && info.isConnected()) { if (info.getState() == NetworkInfo.State.CONNECTED) { return true; } } } return false; } /** * 判断是否是wifi连接 */ public static boolean isWifi(Context context) { ConnectivityManager cm = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); if (cm == null) return false; return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI; } /** * 打开网络设置界面 */ public static void openSetting(Activity activity) { Intent intent = new Intent("/"); ComponentName cm = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings"); intent.setComponent(cm); intent.setAction("android.intent.action.VIEW"); activity.startActivityForResult(intent, 0); } }
10、Http相关辅助类 HttpUtils
[java] view plain copy print?package com.zhy.utils;import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
/**
* Http请求的工具类
*
* @author zhy
*
*/
public class HttpUtils
{
private static final int TIMEOUT_IN_MILLIONS = 5000;
public interface CallBack
{
void onRequestComplete(String result);
}
/**
* 异步的Get请求
*
* @param urlStr
* @param callBack
*/
public static void doGetAsyn(final String urlStr, final CallBack callBack)
{
new Thread()
{
public void run()
{
try
{
String result = doGet(urlStr);
if (callBack != null)
{
callBack.onRequestComplete(result);
}
} catch (Exception e)
{
e.printStackTrace();
}
};
}.start();
}
/**
* 异步的Post请求
* @param urlStr
* @param params
* @param callBack
* @throws Exception
*/
public static void doPostAsyn(final String urlStr, final String params,
final CallBack callBack) throws Exception
{
new Thread()
{
public void run()
{
try
{
String result = doPost(urlStr, params);
if (callBack != null)
{
callBack.onRequestComplete(result);
}
} catch (Exception e)
{
e.printStackTrace();
}
};
}.start();
}
/**
* Get请求,获得返回数据
*
* @param urlStr
* @return
* @throws Exception
*/
public static String doGet(String urlStr)
{
URL url = null;
HttpURLConnection conn = null;
InputStream is = null;
ByteArrayOutputStream baos = null;
try
{
url = new URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
conn.setRequestMethod(”GET”);
conn.setRequestProperty(”accept”, “*/*”);
conn.setRequestProperty(”connection”, “Keep-Alive”);
if (conn.getResponseCode() == 200)
{
is = conn.getInputStream();
baos = new ByteArrayOutputStream();
int len = -1;
byte[] buf = new byte[128];
while ((len = is.read(buf)) != -1)
{
baos.write(buf, 0, len);
}
baos.flush();
return baos.toString();
} else
{
throw new RuntimeException(“ responseCode is not 200 … ”);
}
} catch (Exception e)
{
e.printStackTrace();
} finally
{
try
{
if (is != null)
is.close();
} catch (IOException e)
{
}
try
{
if (baos != null)
baos.close();
} catch (IOException e)
{
}
conn.disconnect();
}
return null ;
}
/**
* 向指定 URL 发送POST方法的请求
*
* @param url
* 发送请求的 URL
* @param param
* 请求参数,请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
* @throws Exception
*/
public static String doPost(String url, String param)
{
PrintWriter out = null;
BufferedReader in = null;
String result = ”“;
try
{
URL realUrl = new URL(url);
// 打开和URL之间的连接
HttpURLConnection conn = (HttpURLConnection) realUrl
.openConnection();
// 设置通用的请求属性
conn.setRequestProperty(”accept”, “*/*”);
conn.setRequestProperty(”connection”, “Keep-Alive”);
conn.setRequestMethod(”POST”);
conn.setRequestProperty(”Content-Type”,
”application/x-www-form-urlencoded”);
conn.setRequestProperty(”charset”, “utf-8”);
conn.setUseCaches(false);
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
if (param != null && !param.trim().equals(“”))
{
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
}
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null)
{
result += line;
}
} catch (Exception e)
{
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally
{
try
{
if (out != null)
{
out.close();
}
if (in != null)
{
in.close();
}
} catch (IOException ex)
{
ex.printStackTrace();
}
}
return result;
}
}
package com.zhy.utils; import java.io.BufferedReader; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.HttpURLConnection; import java.net.URL; /** * Http请求的工具类 * * @author zhy * */ public class HttpUtils { private static final int TIMEOUT_IN_MILLIONS = 5000; public interface CallBack { void onRequestComplete(String result); } /** * 异步的Get请求 * * @param urlStr * @param callBack */ public static void doGetAsyn(final String urlStr, final CallBack callBack) { new Thread() { public void run() { try { String result = doGet(urlStr); if (callBack != null) { callBack.onRequestComplete(result); } } catch (Exception e) { e.printStackTrace(); } }; }.start(); } /** * 异步的Post请求 * @param urlStr * @param params * @param callBack * @throws Exception */ public static void doPostAsyn(final String urlStr, final String params, final CallBack callBack) throws Exception { new Thread() { public void run() { try { String result = doPost(urlStr, params); if (callBack != null) { callBack.onRequestComplete(result); } } catch (Exception e) { e.printStackTrace(); } }; }.start(); } /** * Get请求,获得返回数据 * * @param urlStr * @return * @throws Exception */ public static String doGet(String urlStr) { URL url = null; HttpURLConnection conn = null; InputStream is = null; ByteArrayOutputStream baos = null; try { url = new URL(urlStr); conn = (HttpURLConnection) url.openConnection(); conn.setReadTimeout(TIMEOUT_IN_MILLIONS); conn.setConnectTimeout(TIMEOUT_IN_MILLIONS); conn.setRequestMethod("GET"); conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); if (conn.getResponseCode() == 200) { is = conn.getInputStream(); baos = new ByteArrayOutputStream(); int len = -1; byte[] buf = new byte[128]; while ((len = is.read(buf)) != -1) { baos.write(buf, 0, len); } baos.flush(); return baos.toString(); } else { throw new RuntimeException(" responseCode is not 200 ... "); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (is != null) is.close(); } catch (IOException e) { } try { if (baos != null) baos.close(); } catch (IOException e) { } conn.disconnect(); } return null ; } /** * 向指定 URL 发送POST方法的请求 * * @param url * 发送请求的 URL * @param param * 请求参数,请求参数应该是 name1=value1&name2=value2 的形式。 * @return 所代表远程资源的响应结果 * @throws Exception */ public static String doPost(String url, String param) { PrintWriter out = null; BufferedReader in = null; String result = ""; try { URL realUrl = new URL(url); // 打开和URL之间的连接 HttpURLConnection conn = (HttpURLConnection) realUrl .openConnection(); // 设置通用的请求属性 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("charset", "utf-8"); conn.setUseCaches(false); // 发送POST请求必须设置如下两行 conn.setDoOutput(true); conn.setDoInput(true); conn.setReadTimeout(TIMEOUT_IN_MILLIONS); conn.setConnectTimeout(TIMEOUT_IN_MILLIONS); if (param != null && !param.trim().equals("")) { // 获取URLConnection对象对应的输出流 out = new PrintWriter(conn.getOutputStream()); // 发送请求参数 out.print(param); // flush输出流的缓冲 out.flush(); } // 定义BufferedReader输入流来读取URL的响应 in = new BufferedReader( new InputStreamReader(conn.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { e.printStackTrace(); } // 使用finally块来关闭输出流、输入流 finally { try { if (out != null) { out.close(); } if (in != null) { in.close(); } } catch (IOException ex) { ex.printStackTrace(); } } return result; } }
如果大家在使用过程中出现什么错误,或者有更好的建议,欢迎大家留言提出~~可以不断的改进这些类~
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