Android广播接收器里弹出对话框

 1 public class MyReceiver extends BroadcastReceiver {
 2     @Override
 3     public void onReceive(final Context context, Intent intent) {
 4         AlertDialog.Builder builder = new AlertDialog.Builder(context);
 5         builder.setTitle("提示");
 6         builder.setMessage("确定打开主界面吗？");       
 7         builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
 8             @Override
 9             public void onClick(DialogInterface dialog, int which) {
10                 Intent intent1 = new Intent(context, MainActivity.class);
11 
12                 //在广播接收器中启动活动，一定要给Intent加入FLAG_ACTIVITY_NEW_TASK标志
13                 intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
14                 context.startActivity(intent1);
15             }
16         });
17 
18         AlertDialog dialog = builder.create();
19 
20         //需要把对话框的类型设为TYPE_SYSTEM_ALERT，否则对话框无法在广播接收器里弹出
21         dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
22         dialog.show();
23     }
24 }