如何解決GPS在后台android Pie自動關閉？

Question

我想在android中使用GPS獲取坐標。 我成功地獲得了前景中的位置，但每當我將應用程序放在背景中GPS標志消失並且它在后台停止定位點。 我選擇了不同版本的android，一些定位位置點（低於8.0），有些則不是（Pie）。

如何在Pie中繼續運行GPS背景。我嘗試了不同的SO答案，但沒有得到解決方案。

我正在使用Service在后台運行app並使用Broadcast接收器獲取坐標。 但是我沒有在Pie版本中獲得積分。

這是我的MainActivity.java

public class MainActivity extends AppCompatActivity {

    private LocationManager locationManager;
    private LocationListener locationListener;
    private double latitude, longitude;
    BroadcastReceiver broadcastReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        /*inflating layout*/
        riderFirstName = findViewById(R.id.rider_fName);
        riderLastName = findViewById(R.id.rider_lName);
        riderNote = findViewById(R.id.note);
        logout = findViewById(R.id.logout);     

        if (!runtime_permissions()) {
            Intent i = new Intent(getApplicationContext(), GPS_Service.class);
            startService(i);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();

        if (broadcastReceiver==null){
            broadcastReceiver=new BroadcastReceiver() {
                @Override
                public void onReceive(Context context, Intent intent) {

                    double lat = (double) intent.getExtras().get("latitude");
                    double lng= (double) intent.getExtras().get("longitude");
                    Log.i("lat", String.valueOf(lat));
                    Log.i("lang", String.valueOf(lng));
                    Log.i("lang", String.valueOf(RiderID));

                }
            };
        }
        registerReceiver(broadcastReceiver, new IntentFilter("location_update"));
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        if (broadcastReceiver!=null)
            unregisterReceiver(broadcastReceiver);
    }

    private boolean runtime_permissions() {
        if (Build.VERSION.SDK_INT >= 23 && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

            requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 100);

            return true;
        }
        return false;
    }


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 100) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
                Intent i = new Intent(getApplicationContext(), GPS_Service.class);
                startService(i);
            } else {
                runtime_permissions();
            }
        }
    }

}

這是我的服務類

public class GPS_Service extends Service {
    PowerManager.WakeLock wakeLock;

    private LocationListener listener;
    private LocationManager locationManager;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @SuppressLint("InvalidWakeLockTag")
    @Override
    public void onCreate() {

        listener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                Intent i = new Intent("location_update");
                i.putExtra("latitude",  location.getLatitude());
                i.putExtra("longitude", location.getLongitude());

                sendBroadcast(i);
            }

            @Override
            public void onStatusChanged(String s, int i, Bundle bundle) {

            }

            @Override
            public void onProviderEnabled(String s) {

            }

            @Override
            public void onProviderDisabled(String s) {
                Intent i = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(i);
            }

        };

        locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);

        //noinspection MissingPermission
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, CommonObjects.DELAY_LOCATION, 0, listener);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if(locationManager != null){
            //noinspection MissingPermission
            locationManager.removeUpdates(listener);
        }
    }
}

這是清單

 <!-- my permissions -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

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

Answer 1

通過使用startForegroundService()而不是startService()我得到了解決方案我的問題（在后台獲得GPS位置）為Oreo（8.0）及以上版本。

對於實現，我們必須在Manifest和startForeground();添加Foreground權限startForeground(); Service類中的方法如下所示：

這是我更新的MianActivity.java代碼

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ...    

        if (!runtime_permissions()) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
        {
            Intent serviceIntent = new Intent(context, YourService.class);
            ContextCompat.startForegroundService(context, serviceIntent );
        }
        else
        {
            context.startService(new Intent(context, YourService.class));
        }
        }
    }

更新了我的服務類

@SuppressLint("InvalidWakeLockTag")
    @Override
    public void onCreate() {

     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
            startMyOwnForeground();
        else
            startForeground(1, new Notification());

     ...

}

private void startMyOwnForeground(){
        String NOTIFICATION_CHANNEL_ID = "com.example.simpleapp";
        String channelName = "My Background Service";
        NotificationChannel chan = null;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            chan = new NotificationChannel(NOTIFICATION_CHANNEL_ID, channelName, NotificationManager.IMPORTANCE_NONE);
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            chan.setLightColor(Color.BLUE);
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
        }
        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        assert manager != null;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            manager.createNotificationChannel(chan);
        }

        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
        Notification notification = notificationBuilder.setOngoing(true)
                .setContentTitle("App is running in background")
                .setPriority(NotificationManager.IMPORTANCE_MIN)
                .setCategory(Notification.CATEGORY_SERVICE)
                .build();
        startForeground(2, notification);
    }

更新了Manifest權限

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