I use startForeground to make my service persistent. Thus, I must build a notification to pass it to the startForeground function.
I want to start that foreground service without letting the notification make an alert (i.e. with vibration or sound).
For android 8 devices, I create a notification channel before calling the startForeground. I set the importance to NotificationManager.IMPORTANCE_NONE to avoid notification alerts (just to make the icon appear on the status bar).
However, on some devices, I still have a notification alert (for Samsung Galaxy S8 and Honor View 10).
So, I tested this approved answer https://stackoverflow.com/a/24008765/10069542.
This worked fine for the Samsung Galaxy S8. Nonetheless, the Honor View 10 still emits an alert when I start my foreground service.
Here is the code to create my notification channel and to build the notification to be passed to startForeground
Notification channel
@RequiresApi(api = Build.VERSION_CODES.O)
private String createNotificationChannel() {
String channelId = NOTIFICATION_CHANNEL_ID;
String channelName = "My Background Service";
NotificationChannel chan = new NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_NONE);
chan.setLightColor(Color.BLUE);
chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
NotificationManager service = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
if (service != null) {
service.createNotificationChannel(chan);
} else {
Log.e(TAG, "Error creating notification channel");
return null;
}
return channelId;
}
Notification
private Notification getNotification() {
Intent startIntent = new Intent(getApplicationContext(), RangoActivity.class);
startIntent.setAction(Intent.ACTION_MAIN);
startIntent.addCategory(Intent.CATEGORY_LAUNCHER);
startIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent contentIntent = PendingIntent.getActivity(
this, REQ_CODE_REQUEST_RANGO_SERVICE, startIntent, PendingIntent.FLAG_UPDATE_CURRENT);
Notification.Builder builder;
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
builder = new Notification.Builder(this, NOTIFICATION_CHANNEL_ID);
} else {
builder = new Notification.Builder(this);
}
builder.setSmallIcon(R.drawable.rango_notification_icon)
.setContentTitle(getString(R.string.notification_content_title))
.setContentText(getString(R.string.notification_content_text))
.setTicker(getString(R.string.notification_ticker))
.setDefaults(Notification.DEFAULT_LIGHTS | Notification.DEFAULT_SOUND)
.setVibrate(new long[]{0L})
.setWhen(System.currentTimeMillis())
.setOngoing(true)
.setAutoCancel(true)
.setContentIntent(contentIntent);
Notification notification = builder.build();
return notification;
}
Here is a NotificationHelper class that supports Android 8+.
Use "getNotificationLow" for no sound.
For init use this: notificationHelper = new NotificationHelper(context);
To show a notification use the methods below:
public Notification.Builder createNotification( String title, String description, int priority ) {
if (notificationHelper == null) {
return null;
} else
{
if ( priority == Notification.PRIORITY_HIGH ) {
return notificationHelper.getNotificationHigh( title, description );
} else if ( priority == Notification.PRIORITY_LOW ) {
return notificationHelper.getNotificationLow( title, description );
} else {
return notificationHelper.getNotificationDefault( title, description );
}
}
}
public void cancelNotification(int notification_id) {
if ( notificationHelper != null )
{
notificationHelper.cancel( notification_id );
}
}
public void showNotification(int notification_id, String title, String description, int priority) {
if ( notificationHelper != null )
{
notificationHelper.notify( notification_id, createNotification(title, description, priority) );
}
}
Here is the Helper class
package com.example.myApp;
import android.annotation.TargetApi;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.os.Build;
@TargetApi( Build.VERSION_CODES.O )
public class NotificationHelper
{
private NotificationManager notifManager;
private static final String CHANNEL_HIGH_ID = "com.example.myApp.high";
private static final String CHANNEL_HIGH_NAME = "myexample (high)";
private static final String CHANNEL_DEFAULT_ID = "com.example.myApp.default";
private static final String CHANNEL_DEFAULT_NAME = "myexample (default)";
private static final String CHANNEL_LOW_NAME = "myexample (low)";
private static final String CHANNEL_LOW_ID = "com.example.myApp.low";
private Context mContext;
public NotificationHelper(Context context)
{
super();
mContext = context;
if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ) {
createChannels();
}
}
public void createChannels() {
NotificationChannel notificationChannel =
new NotificationChannel(CHANNEL_HIGH_ID, CHANNEL_HIGH_NAME, NotificationManager.IMPORTANCE_HIGH);
notificationChannel.enableLights(true);
notificationChannel.enableVibration(true);
notificationChannel.setLightColor(Color.RED);
notificationChannel.setShowBadge(true);
notificationChannel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
getManager().createNotificationChannel(notificationChannel);
NotificationChannel notificationChannel2 =
new NotificationChannel(CHANNEL_DEFAULT_ID, CHANNEL_DEFAULT_NAME, NotificationManager.IMPORTANCE_DEFAULT);
notificationChannel2.enableLights(true);
notificationChannel2.enableVibration(true);
notificationChannel2.setLightColor(Color.RED);
notificationChannel2.setShowBadge(true);
notificationChannel2.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
getManager().createNotificationChannel(notificationChannel2);
NotificationChannel notificationChannel3 =
new NotificationChannel(CHANNEL_LOW_ID, CHANNEL_LOW_NAME, NotificationManager.IMPORTANCE_LOW);
notificationChannel3.enableLights(false);
notificationChannel3.enableVibration(false);
notificationChannel3.setLightColor(Color.RED);
notificationChannel3.setShowBadge(false);
notificationChannel3.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
getManager().createNotificationChannel(notificationChannel3);
}
public Notification.Builder getNotificationHigh(String title, String body) {
Notification.Builder builder;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
{
builder = new Notification.Builder( mContext, CHANNEL_HIGH_ID );
} else {
builder = new Notification.Builder( mContext );
builder.setPriority( Notification.PRIORITY_HIGH );
}
builder.setContentTitle(title);
builder.setContentText(body);
builder.setAutoCancel( true );
builder.setSmallIcon(R.mipmap.ic_launcher_bw);
builder.setLargeIcon( BitmapFactory.decodeResource( mContext.getResources(), R.mipmap.ic_launcher ));
builder.build();
return builder;
}
public Notification.Builder getNotificationDefault(String title, String body) {
Notification.Builder builder;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
{
builder = new Notification.Builder( mContext, CHANNEL_DEFAULT_ID );
} else {
builder = new Notification.Builder( mContext );
builder.setPriority( Notification.PRIORITY_DEFAULT );
}
builder.setContentTitle(title);
builder.setContentText(body);
builder.setAutoCancel( true );
builder.setSmallIcon(R.mipmap.ic_launcher_bw);
builder.setLargeIcon( BitmapFactory.decodeResource( mContext.getResources(), R.mipmap.ic_launcher ));
builder.build();
return builder;
}
public Notification.Builder getNotificationLow(String title, String body) {
Notification.Builder builder;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
{
builder = new Notification.Builder( mContext, CHANNEL_LOW_ID );
} else {
builder = new Notification.Builder( mContext );
builder.setPriority( Notification.PRIORITY_LOW );
}
builder.setContentTitle(title);
builder.setContentText(body);
builder.setAutoCancel( true );
builder.setSmallIcon(R.mipmap.ic_launcher_bw);
builder.setLargeIcon( BitmapFactory.decodeResource( mContext.getResources(), R.mipmap.ic_launcher ));
builder.build();
return builder;
}
public void notify(int id, Notification.Builder notification) {
getManager().notify(id, notification.build());
}
public void cancel(int id) {
getManager().cancel(id);
}
private NotificationManager getManager() {
if (notifManager == null) {
notifManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
}
return notifManager;
}
}