android receiver中显示AlertDialog

AndroidManifest.xml中，加permission

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

	@Override
	public void onReceive(Context context, Intent intent) {
		Log.d("LocalReceiver", " in onReceive");
		// TODO Auto-generated method stub

		AlertDialog.Builder builder = new AlertDialog.Builder(context.getApplicationContext());
		builder.setTitle("Toggle Google Apps").setMessage("to enable/diable google apps");
		AlertDialog alert = builder.create();  //一般builder.show()中实现也会调builder.create()返回AlertDialog再调AlertDialog.show()
		alert.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); //创建AlertDialog设置为系统alert type参数， 使用系统alert
		alert.show();
	}