android - 单击通知并在android中启动应用程序

Question

我目前正在研究 GCM(谷歌云消息传递)，我希望用户在点击收到的通知时启动应用程序，问题是它无法准确检查应用程序是否已启动，所以它总是启动新 Activity 甚至应用程序已经在运行。谢谢

接收者

public class GcmBroadcastReceiver extends WakefulBroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub

        // Explicitly specify that GcmIntentService will handle the intent.
        ComponentName comp = new ComponentName(context.getPackageName(),
                GcmIntentService.class.getName());
        // Start the service, keeping the device awake while it is launching.
        startWakefulService(context, (intent.setComponent(comp)));
        setResultCode(Activity.RESULT_OK);

    }

}

Intent 处理程序

public class GcmIntentService extends IntentService{
    Context context;
    public static final int NOTIFICATION_ID = 1;
    private NotificationManager mNotificationManager;
    NotificationCompat.Builder builder;
    public static final String TAG = "GCM";

    public GcmIntentService() {
        super("GcmIntentService");
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        // TODO Auto-generated method stub
        Bundle extras = intent.getExtras();
        String msg = null;
        msg = intent.getStringExtra("message");
        GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
        String messageType = gcm.getMessageType(intent);

         if (!extras.isEmpty()) {

             if (GoogleCloudMessaging.
                        MESSAGE_TYPE_SEND_ERROR.equals(messageType)) {
                    sendNotification("Send error: " + extras.toString());
                } else if (GoogleCloudMessaging.
                        MESSAGE_TYPE_DELETED.equals(messageType)) {
                    sendNotification("Deleted messages on server: " +
                            extras.toString());
                // If it's a regular GCM message, do some work.
                } else if (GoogleCloudMessaging.
                        MESSAGE_TYPE_MESSAGE.equals(messageType)) {
                    // This loop represents the service doing some work.
                    for (int i=0; i<5; i++) {
                        Log.i(TAG, "Working... " + (i+1)
                                + "/5 @ " + SystemClock.elapsedRealtime());
                        try {
                            Thread.sleep(500);
                        } catch (InterruptedException e) {
                        }
                    }
                    Log.i(TAG, "Completed work @ " + SystemClock.elapsedRealtime());
                    // Post notification of received message.
                    //sendNotification("Received: " + extras.toString());
                    sendNotification(msg);
                    Log.i(TAG, "Received: " + extras.toString());
                }
            }
         GcmBroadcastReceiver.completeWakefulIntent(intent);
    }

    private void sendNotification(String msg) {
        mNotificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
        String notifyMsg = "";
        JSONTokener tokener = new JSONTokener(msg);

        if (tokener != null) {
            try {
                notifyMsg = new JSONObject(tokener).getString("msg");
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        Intent myintent = new Intent(this, MainActivity.class);
        myintent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, myintent, PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
        .setSmallIcon(R.drawable.ic_launcher)
        .setContentTitle(getResources().getString(R.string.notification_title))
        .setStyle(new NotificationCompat.BigTextStyle()
        .bigText(notifyMsg))
        .setContentText(notifyMsg)
        .setContentIntent(contentIntent);

        mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
    }   
}

Answer 1

实际上，您总是在启动新的 Activity 任务，所以它正在发生，而不是您需要恢复或清除已经在运行的顶级 Activity。

您的代码

private void sendNotification(String msg) {
    mNotificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
    String notifyMsg = "";
    JSONTokener tokener = new JSONTokener(msg);

    if (tokener != null) {
        try {
            notifyMsg = new JSONObject(tokener).getString("msg");
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    Intent myintent = new Intent(this, MainActivity.class);
    myintent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, myintent, PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
    .setSmallIcon(R.drawable.ic_launcher)
    .setContentTitle(getResources().getString(R.string.notification_title))
    .setStyle(new NotificationCompat.BigTextStyle()
    .bigText(notifyMsg))
    .setContentText(notifyMsg)
    .setContentIntent(contentIntent);

    mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
}   

编辑代码:

private void sendNotification(String msg) {
    mNotificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
    String notifyMsg = "";
    JSONTokener tokener = new JSONTokener(msg);

    if (tokener != null) {
        try {
            notifyMsg = new JSONObject(tokener).getString("msg");
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    Intent myintent = new Intent(this, MainActivity.class);
    myintent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);//changes 
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, myintent, PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
    .setSmallIcon(R.drawable.ic_launcher)
    .setContentTitle(getResources().getString(R.string.notification_title))
    .setStyle(new NotificationCompat.BigTextStyle()
    .bigText(notifyMsg))
    .setContentText(notifyMsg)
    .setContentIntent(contentIntent);

    mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
}   

希望对您有所帮助。