Android 常用代码集合

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<span style="font-family: Arial, Verdana, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">这篇文章主要记录一些我常用的一些代码段，方便以后查阅，不断更新中</span> 

这篇文章主要记录一些我常用的一些代码段，方便以后查阅，不断更新中

1 调用浏览器 载入某网址

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Uri uri = Uri.parse("http://www.baidu.com");         

Intent it = new Intent(Intent.ACTION_VIEW, uri);         

startActivity(it); 

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public class getBroadcast
extends BroadcastReceiver { 
        @Override 
        public void onReceive(Context context, Intent intent) { 

                
                  if(Intent.ACTION_PACKAGE_ADDED.equals(intent.getAction())){ 

                    Toast.makeText(context, "有应用被添加", Toast.LENGTH_LONG).show(); 

            } 
                else  if(Intent.ACTION_PACKAGE_REMOVED.equals(intent.getAction())){ 

                    Toast.makeText(context,
"有应用被删除", Toast.LENGTH_LONG).show(); 
            } 
              
                else  if(Intent.ACTION_PACKAGE_REPLACED.equals(intent.getAction())){ 

                    Toast.makeText(context,
"有应用被替换", Toast.LENGTH_LONG).show(); 
            } 
                   
                else  if(Intent.ACTION_CAMERA_BUTTON.equals(intent.getAction())){ 

                    Toast.makeText(context,
"按键", Toast.LENGTH_LONG).show(); 
            } 
             
        } 
        
} 

public class getBroadcast extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {

if(Intent.ACTION_PACKAGE_ADDED.equals(intent.getAction())){
Toast.makeText(context, "有应用被添加", Toast.LENGTH_LONG).show();
}
else  if(Intent.ACTION_PACKAGE_REMOVED.equals(intent.getAction())){
Toast.makeText(context, "有应用被删除", Toast.LENGTH_LONG).show();
}

else  if(Intent.ACTION_PACKAGE_REPLACED.equals(intent.getAction())){
Toast.makeText(context, "有应用被替换", Toast.LENGTH_LONG).show();
}

else  if(Intent.ACTION_CAMERA_BUTTON.equals(intent.getAction())){
Toast.makeText(context, "按键", Toast.LENGTH_LONG).show();
}

}

}

需要声明的权限如下AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?> 

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 

      package="zy.Broadcast" 

      android:versionCode="1" 

      android:versionName="1.0"> 

    <application android:icon="@drawable/icon" android:label="@string/app_name"> 

        <activity android:name=".Broadcast" 

                  android:label="@string/app_name"> 

            <intent-filter> 
                <action android:name="android.intent.action.MAIN" /> 

                <category android:name="android.intent.category.LAUNCHER" /> 

            </intent-filter> 
        </activity> 
      <receiver android:name="getBroadcast" android:enabled="true" > 

         <intent-filter> 
             <action android:name="android.intent.action.PACKAGE_ADDED"></action> 

             <!-- <action android:name="android.intent.action.PACKAGE_CHANGED"></action>--> 

             <action android:name="android.intent.action.PACKAGE_REMOVED"></action> 

             <action android:name="android.intent.action.PACKAGE_REPLACED"></action> 

             <!-- <action android:name="android.intent.action.PACKAGE_RESTARTED"></action>--> 

           <!--    <action android:name="android.intent.action.PACKAGE_INSTALL"></action>--> 

               <action android:name="android.intent.action.CAMERA_BUTTON"></action> 

               <data android:scheme="package"></data> 

              </intent-filter> 
</receiver> 
    </application> 
    <uses-sdk android:minSdkVersion="3" /> 

     
</manifest>  

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public void DisplayToast(String str) 

        { 
      Toast.makeText(this,str,Toast.LENGTH_SHORT).show(); 

        }  

public void DisplayToast(String str)
{
Toast.makeText(this,str,Toast.LENGTH_SHORT).show();
}

4 把一个字符串写进文件

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public void writefile(String str,String path ) 

        { 
            File file; 
            FileOutputStream out; 

             try { 

                 //创建文件 
                 file = new File(path); 

                 file.createNewFile(); 
                  
                 //打开文件file的OutputStream 

                 out =
new FileOutputStream(file); 
                 String infoToWrite = str; 
                 //将字符串转换成byte数组写入文件 

                 out.write(infoToWrite.getBytes()); 

                 //关闭文件file的OutputStream 

                 out.close(); 

                  
                  
                  
             } catch (IOException e) { 

                 //将出错信息打印到Logcat 

              DisplayToast(e.toString()); 
                  
             } 
        } 

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public String getinfo(String path) 

        { 
            File file; 
            String str="";  
            FileInputStream in; 
         try{ 
            //打开文件file的InputStream 

             file = new File(path); 

             in = new FileInputStream(file); 

             //将文件内容全部读入到byte数组 

             int length = (int)file.length(); 

             byte[] temp = new
byte[length]; 
             in.read(temp, 0, length); 

             //将byte数组用UTF-8编码并存入display字符串中 

             str =  EncodingUtils.getString(temp,TEXT_ENCODING); 

             //关闭文件file的InputStream 

              
             in.close(); 
         } 
         catch (IOException e) { 

              
          DisplayToast(e.toString()); 
              
         } 
         return str; 

        } 

public String getinfo(String path)
{
File file;
String str="";
FileInputStream in;
try{
//打开文件file的InputStream
file = new File(path);
in = new FileInputStream(file);
//将文件内容全部读入到byte数组
int length = (int)file.length();
byte[] temp = new byte[length];
in.read(temp, 0, length);
//将byte数组用UTF-8编码并存入display字符串中
str =  EncodingUtils.getString(temp,TEXT_ENCODING);
//关闭文件file的InputStream

in.close();
}
catch (IOException e) {

DisplayToast(e.toString());

}
return str;
}

6 调用Android installer 安装和卸载程序

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Intent intent = new Intent(Intent.ACTION_VIEW);  

       intent.setDataAndType(Uri.fromFile(new File("/sdcard/WorldCupTimer.apk")),
"application/vnd.android.package-archive");  

       startActivity(intent); //安装 程序 

        
       Uri packageURI = Uri.parse("package:zy.dnh");      

       Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);      

       startActivity(uninstallIntent);//正常卸载程序 

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activityManager.restartPackage(packageName); 

activityManager.restartPackage(packageName);

8 设置默认来电铃声

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public void setMyRingtone() 

    { 
   File k = new File("/sdcard/Shall We Talk.mp3");
// 设置歌曲路径 
    ContentValues values = new ContentValues(); 

    values.put(MediaStore.MediaColumns.DATA, k.getAbsolutePath()); 

    values.put(MediaStore.MediaColumns.TITLE, "Shall We Talk"); 

    values.put(MediaStore.MediaColumns.SIZE, 8474325); 

    values.put(MediaStore.MediaColumns.MIME_TYPE,
"audio/mp3"); 
    values.put(MediaStore.Audio.Media.ARTIST,
"Madonna"); 
    values.put(MediaStore.Audio.Media.DURATION, 230); 
    values.put(MediaStore.Audio.Media.IS_RINGTONE,
true); 
    values.put(MediaStore.Audio.Media.IS_NOTIFICATION,
false); 
    values.put(MediaStore.Audio.Media.IS_ALARM,
false); 
    values.put(MediaStore.Audio.Media.IS_MUSIC, false); 

    // Insert it into the database 

    Uri uri = MediaStore.Audio.Media.getContentUriForPath(k.getAbsolutePath()); 

    Uri newUri = this.getContentResolver().insert(uri, values); 

    RingtoneManager.setActualDefaultRingtoneUri(this, RingtoneManager.TYPE_RINGTONE, newUri); 

    ;} 

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<uses-permission android:name="android.permission.WRITE_SETTINGS"></uses-permission> 

<uses-permission android:name="android.permission.WRITE_SETTINGS"></uses-permission>

模拟HOME按键

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Intent i=new Intent(Intent.ACTION_MAIN); 

i.addCategory(Intent.CATEGORY_HOME); 
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
context.startActivity(i); 

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Intent intent=new Intent(); 

String data = "content://contacts/people/1"; 

Uri  uri = Uri.parse(data);          intent.setAction(Intent.ACTION_VIEW); 

intent.setData(uri); 
startActivity(intent); 

Intent intent=new Intent();
String data = "content://contacts/people/1";
Uri  uri = Uri.parse(data);			 intent.setAction(Intent.ACTION_VIEW);
intent.setData(uri);
startActivity(intent);

10 发送文件

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void sendFile(String path) 

{ 
    File mZipFile=new File(path); 

       Intent intent = new Intent(  

               Intent.ACTION_SEND);  
     //  intent.setClassName("com.android.bluetooth", "com.broadcom.bt.app.opp.OppLauncherActivity"); 

     // intent.setClassName("com.android.bluetooth", "com.android.bluetooth.opp.BluetoothOppLauncherActivity"); 

       intent.putExtra("subject", mZipFile  

               .getName()); //
 
        
       intent.putExtra("body",
"content by chopsticks"); // 正文
 
       intent.putExtra(Intent.EXTRA_STREAM,  
               Uri.fromFile(mZipFile));
// 添加附件，附件为file对象  
       if (mZipFile.getName().endsWith(".gz")) {  

           intent  
                   .setType("application/x-gzip");
// 如果是gz使用gzip的mime  
       } else if (mZipFile.getName().endsWith(  

               ".txt")) {  
           intent.setType("text/plain");
// 纯文本则用text/plain的mime  
       } else if (mZipFile.getName().endsWith(  

               ".zip")) {  

           intent.setType("application/zip");
// 纯文本则用text/plain的mime  
       } else {  

           intent  
                   .setType("application/octet-stream");
// 其他的均使用流当做二进制数据来发送  
       }  
      // startActivity(intent); 

       startActivity(  
               Intent.createChooser(intent,  
                       "选择蓝牙客户端")); 

} 

void sendFile(String path)
{
File mZipFile=new File(path);
Intent intent = new Intent(
Intent.ACTION_SEND);
//  intent.setClassName("com.android.bluetooth", "com.broadcom.bt.app.opp.OppLauncherActivity");
// intent.setClassName("com.android.bluetooth", "com.android.bluetooth.opp.BluetoothOppLauncherActivity");
intent.putExtra("subject", mZipFile
.getName()); //

intent.putExtra("body", "content by chopsticks"); // 正文
intent.putExtra(Intent.EXTRA_STREAM,
Uri.fromFile(mZipFile)); // 添加附件，附件为file对象
if (mZipFile.getName().endsWith(".gz")) {
intent
.setType("application/x-gzip"); // 如果是gz使用gzip的mime
} else if (mZipFile.getName().endsWith(
".txt")) {
intent.setType("text/plain"); // 纯文本则用text/plain的mime
} else if (mZipFile.getName().endsWith(
".zip")) {
intent.setType("application/zip"); // 纯文本则用text/plain的mime
} else {
intent
.setType("application/octet-stream"); // 其他的均使用流当做二进制数据来发送
}
// startActivity(intent);
startActivity(
Intent.createChooser(intent,
"选择蓝牙客户端"));
}