【黑马Android】(02)短信发送器/布局演示/android下单位/android下Junit/保存数据/android下权限/xml解析和序列化

短信发送器

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheima28.smssender"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.SEND_SMS"/>

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheima28.smssender.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<TextView
android:id="@+id/tv_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请输入手机号" />

<EditText
android:id="@+id/et_number"
android:inputType="number"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/tv_number" />

<TextView
android:id="@+id/tv_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/et_number"
android:text="请输入短信内容" />

<EditText
android:id="@+id/et_content"
android:layout_width="match_parent"
android:layout_height="200px"
android:gravity="top"
android:layout_below="@id/tv_content" />

<Button
android:id="@+id/btn_send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/et_content"
android:text="发送短信" />

</RelativeLayout>

package com.itheima28.smssender;

import android.os.Bundle;
import android.app.Activity;
import android.telephony.SmsManager;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity implements OnClickListener {

private EditText etNumber;
private EditText etContent;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

etNumber = (EditText) findViewById(R.id.et_number);
etContent = (EditText) findViewById(R.id.et_content);

Button button = (Button) findViewById(R.id.btn_send);
button.setOnClickListener(this);
}

@Override
public void onClick(View v) {
// 号码
String number = etNumber.getText().toString();
// 内容
String content = etContent.getText().toString();

SmsManager smsManager = SmsManager.getDefault();

smsManager.sendTextMessage(
number,	// 收件人
null, 	// 短信中心号码
content, // 内容
null,
null);
}

}

布局演示(LinearLayout, RelativeLayout)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="按钮1" />

<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="right|center_vertical"
android:text="按钮2" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="按钮3" />

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="按钮1" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="按钮2" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
an<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="按钮1" />

<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="right|center_vertical"
android:text="按钮2" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="按钮3" />

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="按钮1" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="按钮2" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:text="按钮3" />
</LinearLayout>

</LinearLayout>droid:visibility="gone"
android:text="按钮3" />
</LinearLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="进攻" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:text="左勾拳" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="右勾拳" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="逃跑" />

<Button
android:id="@+id/btn_bisha"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="大绝招" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@id/btn_bisha"
android:layout_alignTop="@id/btn_bisha"
android:text="左" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@id/btn_bisha"
android:layout_centerHorizontal="true"
android:text="上" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/btn_bisha"
android:layout_alignBaseline="@id/btn_bisha"
android:text="右" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/btn_bisha"
android:layout_centerHorizontal="true"
android:text="下" />
</RelativeLayout>

布局演示和android下单位

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="1dp"
android:layout_y="253dp"
android:text="按钮" />

</AbsoluteLayout>

在制作播放器的时候，按钮是层次的。可以使用这种布局方式。

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<Button
android:layout_width="300px"
android:layout_height="300px"
android:layout_gravity="center"
android:text="最底部" />

<Button
android:layout_width="150px"
android:layout_height="150px"
android:layout_gravity="center"
android:text="中间" />

<Button
android:layout_width="50px"
android:layout_height="50px"
android:layout_gravity="center"
android:text="顶部" />
</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:shrinkColumns="0"
android:collapseColumns="0" >

<TableRow android:layout_height="wrap_content" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="第一行, 0列" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="第一行, 1列" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="第一行, 2列" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="第一行, 3列" />
</TableRow>

<TableRow android:layout_height="wrap_content" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="第二行, 0列" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_span="2"
android:text="第二行, 1列" />
</TableRow>

</TableLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
android:layout_width="160px"
android:layout_height="wrap_content"
android:text="单位是px"
android:textSize="18px" />

<Button
android:layout_width="160dp"
android:layout_height="wrap_content"
android:text="单位是sp"
android:textSize="18sp" />
</LinearLayout>

android下Junit

冒烟测试:

adb shell monkey -p <程序的包名> -v <事件的数量>



android下单元测试:

在AndroidManifest.xml文件中配置一下信息:

在manifest节点下:

<instrumentation

android:name="android.test.InstrumentationTestRunner"

android:targetPackage="com.itheima28.junittest" />

在application节点下配置下面信息:

<uses-library android:name="android.test.runner" />

测试时, 定义一个类继承AndroidTestCase

使用另外一个工程进行单元测试

保存数据到手机内存

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >

<EditText
android:id="@+id/et_number"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入QQ号" />

<EditText
android:id="@+id/et_password"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入密码"
android:inputType="textPassword" />

<CheckBox
android:id="@+id/cb_remerber_pwd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="记住密码" />

<Button
android:id="@+id/btn_login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="登录" />

</LinearLayout>

package com.itheima28.qqlogin.utils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.text.TextUtils;

public class Utils {

/**
* 保存用户信息
* @param number
* @param password
* @return true 成功
*/
public static boolean saveUserInfo(String number, String password) {

try {
String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";

FileOutputStream fos = new FileOutputStream(path);

// 307966990##123123
String data = number + "##" + password;

fos.write(data.getBytes());

fos.flush();

fos.close();

return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}

/**
* 保存用户信息
* @param number
* @param password
* @return true 成功
*/
public static boolean saveUserInfo(Context context, String number, String password) {

try {
//			String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";

//			File filesDir = context.getFilesDir();
File filesDir = context.getCacheDir();

File f = new File(filesDir, "itheima28.txt");

FileOutputStream fos = new FileOutputStream(f);

// 307966990##123123
String data = number + "##" + password;

fos.write(data.getBytes());

fos.flush();

fos.close();

return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}

/**
* 返回用户信息
* @return
*/
public static Map<String, String> getUserInfo() {

try {
String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";

FileInputStream fis = new FileInputStream(path);

// 字符流对象
BufferedReader reader = new BufferedReader(new InputStreamReader(fis));

// 307966990##123123
String text = reader.readLine();

if(!TextUtils.isEmpty(text)) {
String[] split = text.split("##");

Map<String, String> userInfoMap = new HashMap<String, String>();
userInfoMap.put("number", split[0]);
userInfoMap.put("password", split[1]);
return userInfoMap;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

/**
* 返回用户信息
* @return
*/
public static Map<String, String> getUserInfo(Context context) {

try {
//			String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";

//			File filesDir = context.getFilesDir();
File filesDir = context.getCacheDir();

File f = new File(filesDir, "itheima28.txt");

FileInputStream fis = new FileInputStream(f);

// 字符流对象
BufferedReader reader = new BufferedReader(new InputStreamReader(fis));

// 307966990##123123
String text = reader.readLine();

if(!TextUtils.isEmpty(text)) {
String[] split = text.split("##");

Map<String, String> userInfoMap = new HashMap<String, String>();
userInfoMap.put("number", split[0]);
userInfoMap.put("password", split[1]);
return userInfoMap;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}

package com.itheima28.qqlogin;

import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

import com.itheima28.qqlogin.utils.Utils;
import com.itheima28.qqlogin.utils.UtilsOfSharedPreferences;

public class MainActivity extends Activity implements OnClickListener {

private static final String TAG = "MainActivity";
private EditText etNumber;
private EditText etPassword;
private CheckBox cbRemerberPWD;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

etNumber = (EditText) findViewById(R.id.et_number);
etPassword = (EditText) findViewById(R.id.et_password);
cbRemerberPWD = (CheckBox) findViewById(R.id.cb_remerber_pwd);
Button btnLogin = (Button) findViewById(R.id.btn_login);

btnLogin.setOnClickListener(this);

// 回显数据
Map<String, String> userInfoMap = UtilsOfSharedPreferences.getUserInfo(this);
if(userInfoMap != null) {
etNumber.setText(userInfoMap.get("number"));
etPassword.setText(userInfoMap.get("password"));
}
}

@Override
public void onClick(View v) {
// 执行登录的操作

// 1. 取出号码和密码
String number = etNumber.getText().toString();
String password = etPassword.getText().toString();

if(TextUtils.isEmpty(number) || TextUtils.isEmpty(password)) {
// 弹出吐司
Toast.makeText(this, "请正确输入", Toast.LENGTH_SHORT).show();
return;
}

// 2. 判断记住密码是否被选中, 如果被选中, 存起来
if(cbRemerberPWD.isChecked()) {
// 当前需要记住密码
Log.i(TAG, "记住密码: " + number + ", " + password);

boolean isSuccess = UtilsOfSharedPreferences.saveUserInfo(this, number, password);

if(isSuccess) {
Toast.makeText(this, "保存成功", 0).show();
} else {
Toast.makeText(this, "保存失败", 0).show();
}
}

// 3. 登陆成功
Toast.makeText(this, "登录成功", 0).show();
}
}

保存数据到sd卡

package com.itheima28.qqlogin.utils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.os.Environment;
import android.text.TextUtils;

public class UtilsOfSDCard {

/**
* 保存用户信息到sd卡
* @param number
* @param password
* @return true 成功
*/
public static boolean saveUserInfo(Context context, String number, String password) {

try {
// 判断当前的手机是否有sd卡
String state = Environment.getExternalStorageState();

if(!Environment.MEDIA_MOUNTED.equals(state)) {
// 已经挂载了sd卡
return false;
}

File sdCardFile = Environment.getExternalStorageDirectory();

File file = new File(sdCardFile, "itheima28.txt");

FileOutputStream fos = new FileOutputStream(file);

String data = number + "##" + password;

fos.write(data.getBytes());

fos.flush();

fos.close();
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}

/**
* 到sd卡获取用户信息
* @return
*/
public static Map<String, String> getUserInfo(Context context) {

try {
// 判断当前的手机是否有sd卡
String state = Environment.getExternalStorageState();

if(!Environment.MEDIA_MOUNTED.equals(state)) {
// 已经挂载了sd卡
return null;
}

File sdCardFile = Environment.getExternalStorageDirectory();

File file = new File(sdCardFile, "itheima28.txt");

BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));

String text = br.readLine();

br.close();

if(!TextUtils.isEmpty(text)) {
Map<String, String> userInfoMap = new HashMap<String, String>();
String[] split = text.split("##");
userInfoMap.put("number", split[0]);
userInfoMap.put("password", split[1]);
return userInfoMap;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheima28.qqlogin"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<!--     写入sd卡的权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheima28.qqlogin.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

获得内存状态

获取sd卡的剩余空间；

package com.itheima28.memorydemo;

import java.io.File;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.StatFs;
import android.text.format.Formatter;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

TextView tvMemoryInfo = (TextView) findViewById(R.id.tv_memory_info);

// 获得sd卡的内存状态
File sdcardFileDir = Environment.getExternalStorageDirectory();
String sdcardMemory = getMemoryInfo(sdcardFileDir);

// 获得手机内部存储控件的状态
File dataFileDir = Environment.getDataDirectory();
String dataMemory = getMemoryInfo(dataFileDir);

tvMemoryInfo.setText("SD卡: " + sdcardMemory + "\n手机内部: " + dataMemory);
}

/**
* 根据路径获取内存状态
* @param path
* @return
*/
private String getMemoryInfo(File path) {
// 获得一个磁盘状态对象
StatFs stat = new StatFs(path.getPath());

long blockSize = stat.getBlockSize();	// 获得一个扇区的大小

long totalBlocks = stat.getBlockCount();	// 获得扇区的总数

long availableBlocks = stat.getAvailableBlocks();	// 获得可用的扇区数量

// 总空间
String totalMemory =  Formatter.formatFileSize(this, totalBlocks * blockSize);
// 可用空间
String availableMemory = Formatter.formatFileSize(this, availableBlocks * blockSize);

return "总空间: " + totalMemory + "\n可用空间: " + availableMemory;
}
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<TextView
android:id="@+id/tv_memory_info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />

</RelativeLayout>

android下权限

文件存储:

this.getFilesDir(); // /data/data/包名/files

this.getCacheDir(); // /data/data/包名/cache

openFileOutput("aa.txt", 0); /data/data/包名/files/aa.txt

权限相关:

1. 私有文件

2. 可读文件

3. 可写文件

4. 可读可写文件.



写数据_权限相关

package com.itheima28.writedata;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 写数据
// 私有文件
writeToLocal("private.txt", Context.MODE_PRIVATE);
// 可读文件
writeToLocal("readable.txt", Context.MODE_WORLD_READABLE);
// 可写文件
writeToLocal("writeable.txt", Context.MODE_WORLD_WRITEABLE);
// 可读可写文件
writeToLocal("readable_writeable.txt", Context.MODE_WORLD_READABLE + Context.MODE_WORLD_WRITEABLE);
}

private void writeToLocal(String fileName, int mode) {
try {
FileOutputStream fos = openFileOutput(fileName, mode);
fos.write(("第一个程序写的数据: " + fileName).getBytes());
fos.flush();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

读数据_权限相关

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >

<Button
android:id="@+id/btn_read_private"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="读私有文件" />

<Button
android:id="@+id/btn_write_private"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="写私有文件" />

<Button
android:id="@+id/btn_read_readable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="读可读文件" />

<Button
android:id="@+id/btn_write_readable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="写可读文件" />

<Button
android:id="@+id/btn_read_writeable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="读可写文件" />

<Button
android:id="@+id/btn_write_writeable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="写可写文件" />

<Button
android:id="@+id/btn_read_readable_writeable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="读可读可写文件" />

<Button
android:id="@+id/btn_write_readable_writeable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="写可读可写文件" />

</LinearLayout>

package com.itheima28.readdata;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

private String basicPath = "/data/data/com.itheima28.writedata/files/";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

findViewById(R.id.btn_read_private).setOnClickListener(this);
findViewById(R.id.btn_write_private).setOnClickListener(this);

findViewById(R.id.btn_read_readable).setOnClickListener(this);
findViewById(R.id.btn_write_readable).setOnClickListener(this);

findViewById(R.id.btn_read_writeable).setOnClickListener(this);
findViewById(R.id.btn_write_writeable).setOnClickListener(this);

findViewById(R.id.btn_read_readable_writeable).setOnClickListener(this);
findViewById(R.id.btn_write_readable_writeable).setOnClickListener(this);
}

/**
* 哪一个控件被点击, v对象就代表被点击的对象
*/
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_read_private:
readFile("private.txt");
break;
case R.id.btn_write_private:
writeFile("private.txt");
break;
case R.id.btn_read_readable:
readFile("readable.txt");
break;
case R.id.btn_write_readable:
writeFile("readable.txt");
break;
case R.id.btn_read_writeable:
readFile("writeable.txt");
break;
case R.id.btn_write_writeable:
writeFile("writeable.txt");
break;
case R.id.btn_read_readable_writeable:
readFile("readable_writeable.txt");
break;
case R.id.btn_write_readable_writeable:
writeFile("readable_writeable.txt");
break;
default:
break;
}
}

/**
* 读文件
* @param fileName
*/
private void readFile(String fileName) {
try {
String path = basicPath + fileName;

BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(path)));
String text = reader.readLine();
reader.close();
Toast.makeText(this, "读取成功: " + text, 0).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, "读取失败: " + fileName, 0).show();
}
}

private void writeFile(String fileName) {
try {
String path = basicPath + fileName;

FileOutputStream fos = new FileOutputStream(path);

fos.write("哈哈, 被我给黑了".getBytes());

fos.flush();

fos.close();
Toast.makeText(this, "写入成功: " + fileName, 0).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, "写入失败: " + fileName, 0).show();
}
}

}

SharedPreferences使用

SharedPreferences存储路径:/data/data/包名/shared_prefs/

package com.itheima28.qqlogin.utils;

import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.text.TextUtils;

public class UtilsOfSharedPreferences {

/**
* 保存用户信息到sd卡
* @param number
* @param password
* @return true 成功
*/
public static boolean saveUserInfo(Context context, String number, String password) {

try {
// /data/data/包名/shared_prefs/itheima28
SharedPreferences sp = context.getSharedPreferences("itheima28", Context.MODE_PRIVATE);

// 获得一个编辑对象
Editor edit = sp.edit();

// 存数据
edit.putString("number", number);
edit.putString("password", password);

// 提交, 数据真正存储起来了.
edit.commit();
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}

/**
* 到sd卡获取用户信息
* @return
*/
public static Map<String, String> getUserInfo(Context context) {

SharedPreferences sp = context.getSharedPreferences("itheima28", Context.MODE_PRIVATE);

String number = sp.getString("number", null);
String password = sp.getString("password", null);

if(!TextUtils.isEmpty(number) && !TextUtils.isEmpty(password)) {
Map<String, String> userInfoMap = new HashMap<String, String>();
userInfoMap.put("number", number);
userInfoMap.put("password", password);
return userInfoMap;
}
return null;
}
}

xml解析和序列化

Person.java

package com.itheima28.xmldemo;

public class Person {

private int id;
private String name;
private int age;
@Override
public String toString() {
return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";
}
public Person(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
public Person() {
super();
// TODO Auto-generated constructor stub
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}

TestCase.java

package com.itheima28.xmldemo.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlSerializer;

import android.os.Environment;
import android.test.AndroidTestCase;
import android.util.Log;
import android.util.Xml;

import com.itheima28.xmldemo.Person;

public class TestCase extends AndroidTestCase {

public void test() {
//		writeXmlToLocal();

List<Person> personList = parserXmlFromLocal();

for (Person person : personList) {
Log.i("TestCase", person.toString());
}
}

/**
* 写xml文件到本地
*/
private void writeXmlToLocal() {
List<Person> personList = getPersonList();

// 获得序列化对象
XmlSerializer serializer = Xml.newSerializer();

try {
File path = new File(Environment.getExternalStorageDirectory(), "persons.xml");
FileOutputStream fos = new FileOutputStream(path);
// 指定序列化对象输出的位置和编码
serializer.setOutput(fos, "utf-8");

serializer.startDocument("utf-8", true);	// 写开始 <?xml version='1.0' encoding='utf-8' standalone='yes' ?>

serializer.startTag(null, "persons");		// <persons>

for (Person person : personList) {
// 开始写人

serializer.startTag(null, "person");	// <person>
serializer.attribute(null, "id", String.valueOf(person.getId()));

// 写名字
serializer.startTag(null, "name");		// <name>
serializer.text(person.getName());
serializer.endTag(null, "name");		// </name>

// 写年龄
serializer.startTag(null, "age");		// <age>
serializer.text(String.valueOf(person.getAge()));
serializer.endTag(null, "age");		// </age>

serializer.endTag(null, "person");	// </person>
}

serializer.endTag(null, "persons");			// </persons>

serializer.endDocument();		// 结束
} catch (Exception e) {
e.printStackTrace();
}

}

private List<Person> getPersonList() {
List<Person> personList = new ArrayList<Person>();

for (int i = 0; i < 30; i++) {
personList.add(new Person(i, "wang" + i, 18 + i));
}

return personList;
}

private List<Person> parserXmlFromLocal() {
try {
File path = new File(Environment.getExternalStorageDirectory(), "persons.xml");
FileInputStream fis = new FileInputStream(path);

// 获得pull解析器对象
XmlPullParser parser = Xml.newPullParser();
// 指定解析的文件和编码格式
parser.setInput(fis, "utf-8");

int eventType = parser.getEventType(); 		// 获得事件类型

List<Person> personList = null;
Person person = null;
String id;
while(eventType != XmlPullParser.END_DOCUMENT) {
String tagName = parser.getName();	// 获得当前节点的名称

switch (eventType) {
case XmlPullParser.START_TAG: 		// 当前等于开始节点  <person>
if("persons".equals(tagName)) {	// <persons>
personList = new ArrayList<Person>();
} else if("person".equals(tagName)) { // <person id="1">
person = new Person();
id = parser.getAttributeValue(null, "id");
person.setId(Integer.valueOf(id));
} else if("name".equals(tagName)) { // <name>
person.setName(parser.nextText());
} else if("age".equals(tagName)) { // <age>
person.setAge(Integer.parseInt(parser.nextText()));
}
break;
case XmlPullParser.END_TAG:		// </persons>
if("person".equals(tagName)) {
// 需要把上面设置好值的person对象添加到集合中
personList.add(person);
}
break;
default:
break;
}

eventType = parser.next();		// 获得下一个事件类型
}
return personList;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}