即使在创建自定义频道后，服务通知错误的无效频道也是如此

Question

我已经实现了一个startForeground() 方法来启动在onCreate() 中调用的持续通知。在两个不同的类中有两种用法。我正在测试 API 27 (Android 8.1)

第一次使用（PictureCapturingService.java）：

onCreate()：

@Override
public void onCreate() {
    super.onCreate();
    Context mContext = this.getApplicationContext();
    context = this.getApplicationContext();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        startMyOwnForeground();
    } else {
        startForeground(1234, new Builder(getApplicationContext()).setContentTitle("Capturing Image").setContentText("").setSmallIcon(R.drawable.icon_notif).build());
    }

startMyOwnForeground()：

@RequiresApi(api = Build.VERSION_CODES.O)
private void startMyOwnForeground() {
    String channelID = "com.example.code";
    NotificationChannel notificationChannel = new NotificationChannel(channelID, "Background Service", NotificationManager.IMPORTANCE_NONE);
    notificationChannel.enableLights(false);
    notificationChannel.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    assert manager != null;
    manager.createNotificationChannel(notificationChannel);

    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, channelID);
    Notification notification = notificationBuilder.setOngoing(true)
            .setSmallIcon(R.drawable.icon_notif)
            .setContentTitle("Capturing Image")
            .setPriority(NotificationManager.IMPORTANCE_MIN)
            .setCategory(Notification.CATEGORY_SERVICE)
            .build();

    startForeground(1234, notification);
}

第二次使用（VideoRecordService.java）：

从onCreate() 和startRecord() 调用

onCreate()：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        startMyOwnForeground("Sending Message");
    }
    else {
        startForeground(1234, new Builder(this).setContentTitle("Sending Message").setContentText("").setSmallIcon(R.drawable.icon_notif).build());
    }

startRecord()：

private void startRecord() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        startMyOwnForeground("Video Recording");
    } else {
        startForeground(1234, new Builder(getApplicationContext()).setContentTitle("Video Recording").setContentText("").setSmallIcon(R.drawable.icon_notif).build());
    }

startMyOwnForeground：

@RequiresApi(api = Build.VERSION_CODES.O)
private void startMyOwnForeground(String str) {
    String channelID = "com.example.code";
    NotificationChannel notificationChannel = new NotificationChannel(channelID, "Background Service", NotificationManager.IMPORTANCE_NONE);
    notificationChannel.enableLights(false);
    notificationChannel.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    assert manager != null;
    manager.createNotificationChannel(notificationChannel);

    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, channelID);
    Notification notification = notificationBuilder.setOngoing(true)
            .setSmallIcon(R.drawable.icon_notif)
            .setContentTitle(str)
            .setPriority(NotificationManager.IMPORTANCE_MIN)
            .setCategory(Notification.CATEGORY_SERVICE)
            .build();

    startForeground(1234, notification);
}

我收到以下错误：

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.raudram.barathikannamma, PID: 18871
android.app.RemoteServiceException: Bad notification for startForeground: java.lang.RuntimeException: invalid channel for service notification: Notification(channel=null pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x40 color=0x00000000 vis=PRIVATE)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:176)
    at android.app.ActivityThread.main(ActivityThread.java:6651)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)

Answer 1

您的图标设置为R.mipmap.ic_launcher。顾名思义，这表明您正在尝试将应用启动器图标用作通知图标。不过，这不是一个有效的通知图标。

使用 Android Studio 中的图像资产向导创建一个专用的通知图标 - 您将在向导中为“图标类型”找到一个专用的“通知图标”类别。然后，切换到使用该资源，而不是 R.mipmap.ic_launcher，看看是否有更好的结果。

Answer 2

听着，你创建通知通道的类必须继承Application类enter image description here

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