Android廣播接收器裏彈出對話框

很少說,直接上車。。。android

 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("肯定打開主界面嗎?");       
 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                 //在廣播接收器中啓動活動,必定要給Intent加入FLAG_ACTIVITY_NEW_TASK標誌
13                 intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
14                 context.startActivity(intent1);
15             }
16         });
17 
18         AlertDialog dialog = builder.create();
19 
20         //須要把對話框的類型設爲TYPE_SYSTEM_ALERT,不然對話框沒法在廣播接收器裏彈出
21         dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
22         dialog.show();
23     }
24 }

注意:把對話框的類型設爲了TYPE_SYSTEM_ALERT, 這樣彈出的就是一個系統級別的對話框,所以必須聲明android.permission.SYSTEM_ALERT_WINDOW權限。最後不要忘記註冊廣播接收器哦。ide

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