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Firebase - 当用户点击通知时活动重新启动

[英]Firebase - Activity restarts when user clicks notification

我正在编写一个使用 firebase 来实现通知的应用程序。 在我的 MainActivity 中,我有一个带有一些 url 的 WebView,但问题是当用户单击通知时,我想在 WebView 中使用不同的 url 打开 MainActiviy。 我已经阅读了很多内容,并且已经向意图(单击通知时打开 MainActivity)添加了一个包,其中包含所需的 url。 但是当我点击通知时,MainActivity 重新启动,我的意思是,它不会转到 onNewIntent,而是运行 onCreate。 我是这样实现的:

private void sendNotification(String messageTitle, String messageBody, String url){

    Intent intent = new Intent(this, MainActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

    //This adds the url to the intent
    if(!url.equals("")){
        Bundle bundle = new Bundle();
        bundle.putString("url", url);
        intent.putExtras(bundle);
    }

    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,intent, PendingIntent.FLAG_ONE_SHOT);

    String channelId = getString(R.string.default_notification_channel_id);

    NotificationCompat.Builder notificationBuilder = new NotificationCompat
            .Builder(this, channelId)
            .setContentTitle(messageTitle)
            .setContentText(messageBody)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setAutoCancel(true)
            .setSmallIcon(R.drawable.ic_launcher_background)
            .setContentIntent(pendingIntent);

    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
        NotificationChannel channel = new NotificationChannel(channelId,
                "Notification channel",
                NotificationManager.IMPORTANCE_DEFAULT);
        notificationManager.createNotificationChannel(channel);
    }

    notificationManager.notify(0, notificationBuilder.build());

}

onNewIntent 我有这个:

Bundle bundle = intent.getExtras();
        if (bundle != null) {
            String url = bundle.getString("url");
            mWebView.loadUrl(url);
        }

但是当点击通知时,活动只是重新启动,所以它不会在NewIntent上运行,并且日志给了我这个错误:

02-08 12:51:12.140 19056-19056/com.example.android.app E/ActivityThread: Activity com.example.android.app.MainActivity has leaked IntentReceiver com.example.android.app.MainActivity$1@d7818db that was originally registered here. Are you missing a call to unregisterReceiver()?
android.app.IntentReceiverLeaked: Activity com.example.android.app.MainActivity has leaked IntentReceiver com.example.android.app.MainActivity$1@d7818db that was originally registered here. Are you missing a call to unregisterReceiver()?
    at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:999)
    at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:795)
    at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1329)
    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1309)
    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1303)
    at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:554)
    at com.example.android.app.MainActivity.onCreate(MainActivity.java:264)
    at android.app.Activity.performCreate(Activity.java:6367)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2404)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2511)
    at android.app.ActivityThread.access$900(ActivityThread.java:165)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1375)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:150)
    at android.app.ActivityThread.main(ActivityThread.java:5621)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)

我在stackoverflow上读到一个类似的问题是取消注册一个BroadCastReceiver来修复这个错误,但我对如何去做有点迷茫。

我已经尝试将 sendNotification 的意图更改为

Intent intent = new Intent("android.intent.action.MAIN");

但在这种情况下,当用户单击通知时,它什么也不做。

有谁知道如何修复它以便在用户点击时加载 url? 提前谢谢你

Android 文档中它说明了这一点:

如果它已经声明它的启动模式为“multiple”(默认)并且你没有在同一个意图中设置FLAG_ACTIVITY_SINGLE_TOP ,那么它将被完成并重新创建; 对于所有其他启动模式,或者如果FLAG_ACTIVITY_SINGLE_TOP被设置,那么这个 Intent 将被传递到当前实例的 onNewIntent()。

所以看起来像在创建新意图时设置FLAG_ACTIVITY_SINGLE_TOP标志应该解决并运行 onNewIntent() 方法,而不是重新创建应用程序。

创建一个这样的方法

private PendingIntent retrievePlaybackAction(final String action) {
    Intent intent = new Intent(action);
    return PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
}

现在像这样添加你的意图

builder.setContentIntent(retrievePlaybackAction("OPEN_MAIN")); //change action text as you want

创建一个我猜你已经创建的简单类NotificationReceiver ,现在从你发送通知的地方创建这个类的对象

private NotificationReceiver notificationReceiver;

onCreate()注册您的接收器

notificationReceiver = new NotificationReceiver();

IntentFilter intentFilterNextClick = new IntentFilter("OPEN_MAIN");

registerReceiver(notificationReceiver, intentFilterNextClick); 
//can create exception, better to surround with try catch

onDestroy()取消注册您的接收器

unregisterReceiver(notificationReceiver); 
//can create exception, better to surround with try catch

要打开或执行某些操作,请将其添加到您的接收器中

@Override
public void onReceive(Context context, Intent intent) {
    Log.e(TAG, "onReceive: received " + intent.getAction());

    String action = intent.getAction();

    //no need to create switch you can also use if
    switch (action) {
        case "OPEN_MAIN":
            openMain();
            break;
    }

}

//here is openMain();
private void openMain(Context context) {
    Intent openMainIntent = new Intent(context, MainActivity.class);
    openMainIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //this flag is important
    context.startActivity(openMainIntent);
}

如果应用程序被最小化或关闭,这也将起作用

希望这会有所帮助!

请询问您是否需要更多帮助!

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