Notice:
Regarding startForeground (id, notification), if id is 0, it crashes, if id is 1, notification function is disabled, id is 2 I encountered the phenomenon of being notified. Note that it was OK if it was not 0 in the street, but it was not so in my code, so it is set to 2 in the code font> td> table>
Notification.Builder(context,channelId) || NotificationCompat.Builder(context,channelId)The context is required to use the notification area by the Android System and will not exist beyond the lifetime of the generated Builder object.
** 1. Notification code before API25 **
** 2. Notification code for API 26 or later **
** 3. Android 9 Pie or later manifest additional code **
** 4. Code that determines API 25 or earlier and API 26 or later **
1. Notification code before API25
--Content settings with builder
--Display notification with notify
MainActivity
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this,"channel_id");
builder.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("title under 8")
.setContentText("content under 8")
.setPriority(NotificationCompat.PRIORITY_DEFAULT);
NotificationManager manager =(NotificationManager)getSystemService(this.NOTIFICATION_SERVICE);
manager.notify(0,builder.build());
}
2. API26 or later notification code
--Content settings with builder
--Set importance on channel
--Generate channel
--Display notification with notify
MainActivity
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this,"channel_id");
builder.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("title over 8")
.setContentText("content over 8");
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel("channel_id","name",importance);
NotificationManager manager =(NotificationManager)getSystemService(this.NOTIFICATION_SERVICE);
manager.createNotificationChannel(channel);
manager.notify(0,builder.build());
}
3. Android 9 Pie or later manifest additional code
AandroidManifest
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
4. Code that determines API 25 or earlier and API 26 or later
if(Build.VERSION.SDK_INT >=26)
MainActivity
String CHANNEL_ID = "channel_id";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createNotificationChannel();
NotificationCompat.Builder builder = new NotificationCompat.Builder(this,CHANNEL_ID);
builder.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("title")
.setContentText("content")
.setPriority(NotificationCompat.PRIORITY_DEFAULT);
NotificationManager manager =(NotificationManager)getSystemService(this.NOTIFICATION_SERVICE);
manager.notify(0,builder.build());
}
private void createNotificationChannel(){
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel(CHANNEL_ID,"channel_name",importance);
NotificationManager manager =(NotificationManager)getSystemService(this.NOTIFICATION_SERVICE);
manager.createNotificationChannel(channel);
}
}
IntentService and Notification
1. Create notification with API16
--Create a project with Android studio targeting API16
--Service uses Intent Service
--Emulator Android4.1 JellyBean API16 output
** Intent Service code without API Level judgment **
** Intent Service code with API Level judgment **
API16 startService code (MainActivity)
MainActivity
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new Intent(this,MyService.class);
if(Build.VERSION_SDK_INT >= 26){
startForegroundService(intent);
}else{
startService(intent);
}
}
IntentService code without API Level judgment
IntentService
@Override
public int onStartCommand(Intent intent,int flag,int starId){
Context context = getApplicationContext();
NotificationCompat.Builder builder = new NotificationCompat.Builder(context,"id")
.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("Title")
.setPriority(NotificationCompat.PRIORITY_LOW);
NotificationManagerCompat manager = NotificationManagerCompat.from(context);
manager.notify(1,builder.build());
function();
return START_STICKY;
}
public void function(){
//What you want to do
}
IntentService code with API Level
IntentService
public MyIntentService() {
super("MyIntentService");
}
@Override
protected void onHandleIntent(Intent intent) {
NotificationCompat.Builder builder = new NotificationCompat.Builder(this,"channel");
builder.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("sample_title")
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.build();
if(Build.VERSION.SDK_INT >=26){
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel("channel","name",importance);
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(channel);
}
NotificationManagerCompat compatManager =NotificationManagerCompat.from(this);
startForeground(1,builder.build());
compatManager.notify(1,builder.build());
function();
return START_STICKY;
}
public void function(){
//What you want to do
}
2. Create notification with API29
--Create a project with Android studio targeting API29
--Service uses Intent Service
--Emulator Android9.0 Pie API29 output
Emulator Even if it is output to Android 4.1, it was notified normally
API29 MainActivity code
MainActivity
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new Intent(this,MyIntentService.class);
if(Build.VERSION.SDK_INT >= 26){
startForegroundService(intent);
}else{
startService(intent);
}
}
API29 IntentService code
IntentService
protected void onHandleIntent(Intent intent) {
Notification notification;
NotificationCompat.Builder builder = new NotificationCompat.Builder(this,"id");
notification = builder.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("title")
.setContentText("text")
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.build();
startForeground(2,notification);
if(Build.VERSION.SDK_INT >= 26){
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel("id","name",importance);
NotificationManager notificationManager = getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
NotificationManagerCompat managerCompat = NotificationManagerCompat.from(this);
managerCompat.notify(1,notification);
function();
return START_STICKY;
}
public void function(){
//What you want to do
}
Service and Notification
AndroidManifest.java
AndroidManifest.java
<manifest ...
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
MainActivity.java
--For API26 and above, start the service with startForegroundService (intent).
--For API26 or less, start service with startService (intent).
MainActivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Intent intent = new Intent(this,MyService.class);
Button btn_start = findViewById(R.id.btn_start);
Button btn_stop = findViewById(R.id.btn_stop);
btn_start.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
if(Build.VERSION.SDK_INT >=26){
startForegroundService(intent);
}else{
startService(intent);
}
}
});
btn_stop.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
stopService(intent);
}
});
}
MyService.java
MyService.java
@Override
public int onStartCommand(Intent intent,int flags,int startId){
//Set notification content
Notification notification;
Intent intent_pending = new Intent(this,MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,0,intent_pending,0);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this,"id");
notification = builder.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("Title")
.setContentText("Text")
.setContentIntent(pendingIntent)
.build();
//API26 and above: startForeground(notificationId,notification)Notification display with
//Generate a channel by setting the importance of the channel for each notification
if(Build.VERSION.SDL_INT >= 26){
int importance = NotificationManager.IMPORTANCE_LOW;
NotificationChannel channel = new NotificationChannel("id","nama",importance);
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(channel);
startForeground(1,notification);
}else{
//Less than API26: Set importance for each component
// notify(notificationId,notification)Notification display with
NotificationManagerCompat managerCompat = NotificationCompat.from(this);
notification = builder.setPriority(NotificationCompat.PRIORITY_LOW).build();
managerCompat.notify(1,notification);
}
// ToDo
Log.d("msg","Mesage");
//
return START_STICKY;
}