Android编程实现监控apk安装，卸载，替换的方法

public class GetBroadcast extends BroadcastReceiver {  private static GetBroadcast mReceiver = new GetBroadcast();  private static IntentFilter mIntentFilter;  public static void registerReceiver(Context context) {    mIntentFilter = new IntentFilter();    mIntentFilter.addDataScheme("package");    mIntentFilter.addAction(Intent.ACTION_PACKAGE_ADDED);    mIntentFilter.addAction(Intent.ACTION_PACKAGE_REMOVED);    mIntentFilter.addAction(Intent.ACTION_PACKAGE_REPLACED);    context.registerReceiver(mReceiver, mIntentFilter);  }  public static void unregisterReceiver(Context context) {    context.unregisterReceiver(mReceiver);  }  @Override  public void onReceive(Context context, Intent intent) {    String action = intent.getAction();    if (Intent.ACTION_PACKAGE_ADDED.equals(action)) {      Toast.makeText(context, "有应用被添加", Toast.LENGTH_LONG).show();    } else if (Intent.ACTION_PACKAGE_REMOVED.equals(action)) {      Toast.makeText(context, "有应用被删除", Toast.LENGTH_LONG).show();    }    /*    * else if(Intent.ACTION_PACKAGE_CHANGED.equals(action)){    * Toast.makeText(context, "有应用被改变", Toast.LENGTH_LONG).show(); }    */    else if (Intent.ACTION_PACKAGE_REPLACED.equals(action)) {      Toast.makeText(context, "有应用被替换", Toast.LENGTH_LONG).show();    }    /*    * else if(Intent.ACTION_PACKAGE_RESTARTED.equals(action)){    * Toast.makeText(context, "有应用被重启", Toast.LENGTH_LONG).show(); }    */    /*    * else if(Intent.ACTION_PACKAGE_INSTALL.equals(action)){    * Toast.makeText(context, "有应用被安装", Toast.LENGTH_LONG).show(); }    */  }}