Question

我的服务如下：

public class service extends Service
{
    private static final String TAG = "MyService";
    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "onCreate");
    }
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
    public void onDestroy() {
        Toast.makeText(this, "My Service Stopped", Toast.LENGTH_LONG).show();
        Log.d(TAG, "onDestroy");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId)
    {
        Intent intents = new Intent(getBaseContext(),MainActivity.class);
        intents.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intents);
        Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
        Log.d(TAG, "onStart");
        return START_NOT_STICKY;
    }
}

运行良好，我可以在进入应用程序设置时检查服务是否正在运行。但是，如果我通过长按主屏幕按钮清除所有应用程序并清除它们。我没有看到我正在运行的服务。如何在后台运行我的服务，甚至用户清除应用程序或内存？谢谢所有

这是我的清单

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

    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".autostart">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>
        <service android:enabled="true"
                android:process=":hello"
                android:name=".service" />
    </application>

</manifest>

Answer 1

替换

return START_NOT_STICKY;

与

return START_STICKY;

在 onStartCommand（）。

中

Answer 2

使用AlarmManager定期致电服务。

初始化AlarmManager，您可以调用 MainActivity ：

public void startAlert() {
    int i = 5;
    Intent intent = new Intent(this, MyBroadcastReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(
            this.getApplicationContext(), 234324243, intent, 0);
    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    alarmManager.setRepeating(AlarmManager.RTC, System.currentTimeMillis(),
            1000 * 5, pendingIntent);
    Toast.makeText(this, "Alarm set in " + i + " seconds",Toast.LENGTH_LONG).show();
}

创建类扩展 BroadcastReceiver

public class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    System.out.println("Alarm...");
    Toast.makeText(context, "Alarm....", Toast.LENGTH_LONG).show();

    if(!isMyServiceRunning(YourService.class,context)) {
        System.out.println("Alarm... services starting...");
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            context.startForegroundService(new Intent(context, YourService.class));
        } else {
            context.startService(new Intent(context, YourService.class));
        }
    }else {
        System.out.println("Alarm... services already running...");
    }
}

private boolean isMyServiceRunning(Class<?> serviceClass,Context context) {
    ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
        if (serviceClass.getName().equals(service.service.getClassName())) {
            Log.i ("isMyServiceRunning?", true+"");
            return true;
        }
    }
    Log.i ("isMyServiceRunning?", false+"");
    return false;
}}

AndroidManifest.xml

<receiver android:name=".services.MyBroadcastReceiver" >
    </receiver>

当我在Android 8.1中尝试时，警报不会每5秒重复一次，而是每1分钟运行一次。

保持服务在后台运行，即使用户清除内存

2 个答案: