我正在尝试打开一个 Activity单击通知时，下面是我的代码。

Intent intent = new Intent(this.getApplicationContext(), NotificationActivity.class);
intent.putExtra("msgBody",messageBody);
intent.putExtra(Constants.NOTIF_INTENT_TYPE,Constants.NOTIF_INTENT_TYPE);

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                |Intent.FLAG_ACTIVITY_SINGLE_TOP
                |Intent.FLAG_ACTIVITY_CLEAR_TOP); //Tried with many options here

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

Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.otp_icon)
                .setContentTitle("Push MSG")
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);

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

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

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.com.pushapp">

    <uses-sdk
        android:minSdkVersion="17"
        android:targetSdkVersion="21" />

    <supports-screens
        android:anyDensity="true"
        android:largeScreens="true"
        android:normalScreens="true"
        android:smallScreens="true" />

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_LOGS" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:name=".AndroidPushApp"
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher">
        <activity
            android:name=".PushSplashScreen"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".MainApplicationScreen"
            android:screenOrientation="portrait"
            android:windowSoftInputMode="adjustResize">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
            </intent-filter>
        </activity>
        <activity
            android:name=".StartActivity"
            android:launchMode="singleTask"
            android:screenOrientation="portrait"
            android:uiOptions="splitActionBarWhenNarrow"
            android:windowSoftInputMode="adjustResize">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
            </intent-filter>
        </activity>

        <service android:name=".MyFirebaseMessagingService">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>

        <service android:name=".MyFirebaseInstanceIDService">
            <intent-filter>
                <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
            </intent-filter>
        </service>

        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />

        <activity
            android:name=".NotificationActivity"
            android:exported="true"
            android:label="@string/title_activity">
            <intent-filter>
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

</manifest>

最佳答案

根据 FCM用于接收和处理消息的文档，

If you want to receive notifications when your app is in the foreground, you need to add some message handling logic.

To receive messages, use a service that extends FirebaseMessagingService. Your service should override the onMessageReceived callback, which is provided for most message types, with the following exceptions:

1). Notifications delivered when your app is in the background. In this case, the notification is delivered to the device’s system tray. A user tap on a notification opens the app launcher by default.

2). Messages with both notification and data payload, both background and foreground. In this case, the notification is delivered to the device’s system tray, and the data payload is delivered in the extras of the intent of your launcher Activity.

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    if (null != remoteMessage.getNotification().getClickAction()) {
            startActivity(remoteMessage.getNotification().getClickAction(), null, this);
    }
}

public void startActivity(String className, Bundle extras, Context context) {
    Class cls = null;
    try {
        cls = Class.forName(className);
    } catch (ClassNotFoundException e) {
        //means you made a wrong input in firebase console
    }
    Intent intent = new Intent(context, cls);
    if (null != extras) {
        intent.putExtras(extras);
    }
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
            | Intent.FLAG_ACTIVITY_CLEAR_TASK);
    context.startActivity(intent);
}

NOTE : This click_action key will work only when the app is in Foreground, for all other case when the app is in Background and closed, it doesn't work. It doesn't even open the Launcher Activity, in case of Background and Closed, if this parameter is specified.

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    Map<String, String> data = remoteMessage.getData();
    if (null != data && 0 < data.size()) {
        if (data.containsKey("custom_key_1")) {
            sendNotification(data.get("custom_key_1"));
        }
    }
}

private void sendNotification(String messageBody) {
        Intent intent = new Intent(this, DesiredActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
                PendingIntent.FLAG_ONE_SHOT);

        Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.ic_stat_ic_notification)
                .setContentTitle("FCM Message")
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);

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

        notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if(getIntent().hasExtra("custom_key_1") && getIntent().getStringExtra("custom_key_1")
            .equals("custom_value_1")){
        startActivity(new Intent(this, DesiredActivity.class));
        finish();
        return;
    }

    // other operations
}

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    if (getIntent().hasExtra("custom_key_1") && getIntent().getStringExtra("custom_key_1")
                .equals("custom_value_1")) {
            startActivity(new Intent(this, DesiredActivity.class));
            finish();
    }
}

Note : Some devices are having issue receiving Notifications in Background as I found some queries over same here. Moreover at the time, I was investigating these cases, my ASUS phone was not receiving notifications in Background for any of the types mentioned above. So not sure what's the issue with these devices.

关于java - 单击通知不会打开提到的 Activity ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40417127/