Java 在Android中单击Firebase通知时向活动发送数据

在我的应用程序中，我希望使用fireBase进行通知
我想在单击通知时（当应用程序关闭时，我的意思是应用程序是

后台

）使用

putExtra

将数据发送到mainActivity
我写了下面的代码，但是当点击通知时（应用程序中是后台），但是为

getStringExtra

显示null

MyNotificationManager类：

public class MyNotificationManager {

    private Context mCtx;
    private Uri soundUri;
    private static MyNotificationManager mInstance;

    public MyNotificationManager(Context context) {
        mCtx = context;
    }

    public static synchronized MyNotificationManager getInstance(Context context) {
        if (mInstance == null) {
            mInstance = new MyNotificationManager(context);
        }
        return mInstance;
    }

    public void displayNotification(String title, String body) {

        soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

        Intent intent = new Intent(mCtx, MainActivity.class);
        intent.putExtra("fcm_notification", "Y");

        PendingIntent pendingIntent = PendingIntent.getActivity(mCtx, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mCtx, Constants.NOTIF_CHANNEL_ID)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(title)
                .setSound(soundUri)
                .setAutoCancel(true)
                .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400})
                .setContentText(body)
                .setContentIntent(pendingIntent);

        NotificationManager mNotifyMgr = (NotificationManager) mCtx.getSystemService(NOTIFICATION_SERVICE);

        if (mNotifyMgr != null) {
            mNotifyMgr.notify(1, mBuilder.build());
        }
    }
}

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        showNotify(remoteMessage.getFrom(), remoteMessage.getNotification().getBody());
    }

    private void showNotify(String title, String body) {
        MyNotificationManager myNotificationManager = new MyNotificationManager(getApplicationContext());
        //myNotificationManager.displayNotification(title, body);
        myNotificationManager.displayNotification(title, body);
    }
}

MyFirebaseMessagingService类：

public class MyNotificationManager {

    private Context mCtx;
    private Uri soundUri;
    private static MyNotificationManager mInstance;

    public MyNotificationManager(Context context) {
        mCtx = context;
    }

    public static synchronized MyNotificationManager getInstance(Context context) {
        if (mInstance == null) {
            mInstance = new MyNotificationManager(context);
        }
        return mInstance;
    }

    public void displayNotification(String title, String body) {

        soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

        Intent intent = new Intent(mCtx, MainActivity.class);
        intent.putExtra("fcm_notification", "Y");

        PendingIntent pendingIntent = PendingIntent.getActivity(mCtx, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mCtx, Constants.NOTIF_CHANNEL_ID)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(title)
                .setSound(soundUri)
                .setAutoCancel(true)
                .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400})
                .setContentText(body)
                .setContentIntent(pendingIntent);

        NotificationManager mNotifyMgr = (NotificationManager) mCtx.getSystemService(NOTIFICATION_SERVICE);

        if (mNotifyMgr != null) {
            mNotifyMgr.notify(1, mBuilder.build());
        }
    }
}

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        showNotify(remoteMessage.getFrom(), remoteMessage.getNotification().getBody());
    }

    private void showNotify(String title, String body) {
        MyNotificationManager myNotificationManager = new MyNotificationManager(getApplicationContext());
        //myNotificationManager.displayNotification(title, body);
        myNotificationManager.displayNotification(title, body);
    }
}

main活动类：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
if (checkIntent()) return;
}

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            checkIntent();
        }
    }, 1000);
}

private boolean checkIntent() {
    String value = getIntent().getStringExtra("fcm_notification");
    Toast.makeText(context, "" + value, Toast.LENGTH_SHORT).show();

    if (value == null) return false;

    if (value.equals("Y")) {
        startActivity(new Intent(this, LandingActivity.class));
        // open one activity.

    } else if (value.equals("another thing")) {
        // open another activity.
    }

    finish();
    return true;
}

Intent intent = new Intent(mCtx, MainActivity.class);
intent.putExtra("EXTRA_DATA", title);

当点击通知（在应用程序上为后台）时，在

Toast

中为此行显示null消息

String value=getIntent（）.getStringExtra（“fcm_通知”）

我怎样才能修好它
 从控制台发送通知时，从“高级选项”添加自定义数据：


由于某些原因，firebase不允许密钥以fcm开头。您不能使用fcm\U通知。使用不同的键

对于上图，按如下方式接收按键：

String value = getIntent().getStringExtra("test_key");

试试这个：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
if (checkIntent()) return;
}

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            checkIntent();
        }
    }, 1000);
}

private boolean checkIntent() {
    String value = getIntent().getStringExtra("fcm_notification");
    Toast.makeText(context, "" + value, Toast.LENGTH_SHORT).show();

    if (value == null) return false;

    if (value.equals("Y")) {
        startActivity(new Intent(this, LandingActivity.class));
        // open one activity.

    } else if (value.equals("another thing")) {
        // open another activity.
    }

    finish();
    return true;
}

Intent intent = new Intent(mCtx, MainActivity.class);
intent.putExtra("EXTRA_DATA", title);

并获得：

String value = getIntent().getStringExtra("EXTRA_DATA");

最好换一下钥匙。另外，您似乎需要从控制台发送数据，然后将数据发送到另一个
活动

我已使用当前通知
title
检查它是否返回了标题。如果它返回了值，请尝试从控制台发送数据。
当应用程序处于后台时，您需要发送
数据负载
以从通知中获取数据。@Yupi，您能帮助我吗？请将以上代码发送给我。你能帮我吗？你如何发送通知？从Firebase控制台？再次显示空：（：（请帮帮我，我真的需要你的帮助，我的兄弟。这很奇怪。你是否从Firebase控制台添加了自定义数据？你是否用你使用的密钥替换了
fcm_通知
？如果应用程序在后台，方法
onMessageReceived
中的代码无关紧要。通知是由库内部创建的。只要在发送通知之前，从FCM控制台添加自定义数据。我使用下面的新代码更改代码。请参见。在MyNotificationManager=
Intent Intent Intent=new Intent（mCtx，MainActivity.class）；Intent.putExtra（“test_key”，keyTest）；PendingIntent PendingIntent=PendingIntent.getActivity（mCtx，0，intent，PENDINGENT.FLAG_UPDATE_CURRENT）
---在MyFirebaseMessagingService=
showNotify（remoteMessage.getFrom（）、remoteMessage.getNotification（）.getBody（）、remoteMessage.getData（）.get（“测试密钥”）；
---并在fireBase控制台上的自定义数据中添加
test_密钥
。再次显示空值。