从广播接收器android中调用活动Alert Box

Question

我有一个启动广播的应用程序。如果应用程序正在运行，无论我在哪个活动中，我都想显示一个弹出窗口，如果没有，则推送通知

这是我的代码

public class AlarmReceiver extends BroadcastReceiver
{
    private static int NOTIFICATION_ID = 1;
    private NotificationManager mNotificationManager;
     @Override
     public void onReceive(final Context ctx, Intent intent) 
     {
         if (isRunning(ctx))
         {
            Intent myIntent = new Intent (ctx, NotifyTagabilityCounter.class);
            myIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            ctx.startActivity(myIntent);
         }
         else
         {
             mNotificationManager = (NotificationManager)
                      ctx.getSystemService(Context.NOTIFICATION_SERVICE);
             Intent i = new Intent(ctx, Game.class);
             i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
             i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
             i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
             i.putExtra(Constants.TAG_TIMESTAMP, true);
             PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0,
                  i, PendingIntent.FLAG_CANCEL_CURRENT);      
             NotificationCompat.Builder mBuilder =
                  new NotificationCompat.Builder(ctx)
                  .setSmallIcon(R.drawable.launcher)
             Notification notification = mBuilder.getNotification();
             notification.flags = Notification.FLAG_AUTO_CANCEL;
             mBuilder.setContentIntent(contentIntent);
             mNotificationManager.notify(NOTIFICATION_ID, notification);
             SharedPreferences customSharedPreference = ctx.getSharedPreferences(
                     "UserSharedPrefs", Activity.MODE_PRIVATE);
            SharedPreferences.Editor editor = customSharedPreference.edit();
            editor.putBoolean(Constants.TAG_NOTIFICATION, true);
            editor.commit();
         }
     }
     public boolean isRunning(Context ctx) 
     {
            ActivityManager activityManager = (ActivityManager)  ctx.getSystemService(Context.ACTIVITY_SERVICE);
            List<RunningTaskInfo> tasks =  activityManager.getRunningTasks(Integer.MAX_VALUE);
            for (RunningTaskInfo task : tasks) 
            {
                if (ctx.getPackageName().equalsIgnoreCase(
                                         task.baseActivity.getPackageName())) 
                    return true;                                  
            }
            return false;
        }

关于创建新的活动NotificyTagabilityCounter

ublic class NotifyTagabilityCounter extends Activity
{
    public static final int NOTIFICATION_ID_RECEIVED = 0x1221;
    static final String ACTION = "com.trib.broadcast";
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        IntentFilter filter = new IntentFilter(ACTION);
        this.registerReceiver(mReceivedReceiver, filter);
    }
private final BroadcastReceiver mReceivedReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (ACTION.equals(action)) 
            {
                displayAlert();
            }
        }
    };    

我得到的只是一个黑屏。我希望显示我的最后一个活动，并在其顶部显示一个弹出的AlertDisplay。这是怎么做到的。。？

Answer 1

要做到这一点：
1-定义两个BroadcastReceivers——清单中优先级较低的第一个，应用程序（运行时）中每个活动中优先级较高的第二个
第一个BroadcastReceivers应显示通知
第二个广播应该CCD_ 4广播并显示对话框。

2-发送已订购的广播。

PS：您可以创建一个BaseActivtiy开关来扩展Activity，并在其上定义第二个广播（不要在onStart()和onStop()中注册和注销广播），
然后使您的所有活动扩展BaseActivtiy