在服务上使用 SharedPreferences 的问题(服务上不存在 getPreferences) [英] Problems using SharedPreferences on a Service (getPreferences doesn't exist on a service)

问题描述

我有一些共享首选项(纬度、经度)，我想从服务访问这些首选项，这些首选项不是从 Activity 子类化的.

I have some shared preferences (latitude, longitude) that I want to access from a service, that is not subclassed from Activity.

特别是，当我尝试访问 getPreferences 时，服务上不存在此功能.我的代码贴在下面

In particular, when I try to access getPreferences, this function doesn't exist's on a service. My code is posted below

我的目标是允许在我的服务中写入这些共享首选项.有什么建议/例子可以帮助我吗?

My goal here is to allow WRITE these shared preferences with my service. Any suggestions/examples that can help me along?

public class MyService extends Service implements Runnable {

    LocationManager mLocationManager;
    Location mLocation;
    MyLocationListener mLocationListener;
    Location currentLocation = null;
    static SharedPreferences settings;
    static SharedPreferences.Editor configEditor;

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

    public void onCreate() {
        settings = this.getPreferences(MODE_WORLD_WRITEABLE);
        configEditor = settings.edit();
        writeSignalGPS();
    }

    private void setCurrentLocation(Location loc) {
        currentLocation = loc;
    }

    private void writeSignalGPS() {
        Thread thread = new Thread(this);
        thread.start();
    }

    @Override
    public void run() {
        mLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        if (mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
            Looper.prepare();
            mLocationListener = new MyLocationListener();
            mLocationManager.requestLocationUpdates(
            LocationManager.GPS_PROVIDER, 1000, 0, mLocationListener);
            Looper.loop();
            //Looper.myLooper().quit();
        } else {
            Toast.makeText(getBaseContext(),
              getResources().getString(R.string.gps_signal_not_found),
              Toast.LENGTH_LONG).show();
        }
    }

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            if (currentLocation!=null) {
                configEditor.putString("mylatitude", ""+currentLocation.getLatitude());
                configEditor.putString("mylongitude", ""+currentLocation.getLongitude());
                configEditor.commit();
            }
        }
    };

    private class MyLocationListener implements LocationListener {
        @Override
        public void onLocationChanged(Location loc) {
            if (loc != null) {
                Toast.makeText(getBaseContext(),
                getResources().getString(R.string.gps_signal_found),
                  Toast.LENGTH_LONG).show();
                setCurrentLocation(loc);
                handler.sendEmptyMessage(0);
            }
        }

    @Override
    public void onProviderDisabled(String provider) {}

    @Override
    public void onProviderEnabled(String provider) {}

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {}
}

我在 settings = this.getPreferences(MODE_WORLD_WRITEABLE);

推荐答案

如果您的应用程序只使用一个 SharedPreferences，请全部 您的代码通过 PreferenceManager.getDefaultSharedPreferences() 获取.

If you are only using one SharedPreferences for your application, have all your code get it via PreferenceManager.getDefaultSharedPreferences().

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