在onLocationChanged（）中处理写入任务时未执行的文件

Question

我正在尝试将位置管理器形成的latitude和longitude写入文件，但写操作由于某种原因不起作用。以下是我一直在尝试的代码。

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        File absPath = getFilesDir();
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Acquire a reference to the system Location Manager
        LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

// Define a listener that responds to location updates
        LocationListener locationListener = new LocationListener() {
            public void onLocationChanged(Location location) {

                String filename = "myfile";
                FileOutputStream outputStream;
                try {
                    outputStream = openFileOutput(filename, Context.MODE_PRIVATE);
                    outputStream.write((location.getLatitude()+","+location.getLongitude()).getBytes());
                    outputStream.close();
                }catch (Exception e) {
                    e.printStackTrace();
                }

            }

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

            public void onProviderEnabled(String provider) {
            }

            public void onProviderDisabled(String provider) {
            }

        };
        locationManager.requestLocationUpdates(NETWORK_PROVIDER, 0, 0, locationListener);
   }
}

感谢任何帮助。谢谢。