android studio app keep
时间: 2023-12-05 14:41:53 浏览: 41
为了保持Android应用程序的运行,可以使用以下方法:
1.使用前台服务:前台服务是一种可以在通知栏中显示通知的服务。这样可以让用户知道应用程序正在运行,并且可以随时停止服务。要创建前台服务,请使用startForeground()方法。
```java
public class MyService extends Service {
private static final int NOTIFICATION_ID = 1;
private static final String CHANNEL_ID = "MyServiceChannel";
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
createNotificationChannel();
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,
0, notificationIntent, 0);
Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
.setContentTitle("My Service")
.setContentText("Running...")
.setSmallIcon(R.drawable.ic_launcher_foreground)
.setContentIntent(pendingIntent)
.build();
startForeground(NOTIFICATION_ID, notification);
// do your work here
return START_NOT_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
private void createNotificationChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel serviceChannel = new NotificationChannel(
CHANNEL_ID,
"My Service Channel",
NotificationManager.IMPORTANCE_DEFAULT
);
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(serviceChannel);
}
}
}
```
2.使用JobScheduler:JobScheduler是一种系统服务,可以在特定条件下运行作业。例如,当设备处于充电状态时,或者当设备连接到WiFi网络时。要使用JobScheduler,请创建一个JobService类,并在AndroidManifest.xml文件中注册它。
```java
public class MyJobService extends JobService {
@Override
public boolean onStartJob(JobParameters params) {
// do your work here
return false; // true if there is still work to do, false otherwise
}
@Override
public boolean onStopJob(JobParameters params) {
return true; // true to reschedule the job, false to drop the job
}
}
```
```xml
<service
android:name=".MyJobService"
android:permission="android.permission.BIND_JOB_SERVICE" />
```
3.使用AlarmManager:AlarmManager是一种系统服务,可以在指定的时间间隔内运行代码。要使用AlarmManager,请创建一个PendingIntent,并使用setRepeating()方法设置重复间隔。
```java
Intent intent = new Intent(this, MyReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
AlarmManager.INTERVAL_HALF_HOUR, pendingIntent);
```