如何在子类中使用 Geocoder

Question

如何在 subclass 中使用 Geocoder class 我应该在其上下文中使用什么值。以下是我的代码，

parent class

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

    dataSource = new PlacesDataSource(this);
    dataSource.open();

}

private void setAllAttributes() {
    backButton = (TextView) findViewById(R.id.textViewBackButton);

    milesEditText = (EditText) findViewById(R.id.saveDistance);
    minsEditText = (EditText) findViewById(R.id.saveMinutes);
    phoneEditText = (EditText) findViewById(R.id.phoneNo);
    msgEditText = (EditText) findViewById(R.id.textMsg);

    storeDetailButton = (Button) findViewById(R.id.storeData);

    storeDetailButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
                            locationListener = new GPSLocationListener();
                            locationManager.requestLocationUpdates(
                                    LocationManager.GPS_PROVIDER,
                                    Long.parseLong(mins),
                                    Float.parseFloat(miles),
                                    locationListener);
}

subclass

private class GPSLocationListener implements LocationListener {

    @Override
    public void onLocationChanged(Location location) {

        String title = null;
        //error 
        Geocoder geo = new Geocoder(this);

        Places place = new Places();

        StringBuffer description = new StringBuffer();
        description.append("http://maps.google.com?q=");
        description.append(location.getLatitude());
        description.append(",");
        description.append(location.getLongitude());

        try {
            List<Address> list = geo.getFromLocation(
                    location.getLatitude(), location.getLongitude(), 1);

            Address add = list.get(0);
            title = add.getLocality();

        } catch (IOException e) {
            Log.i(LOGTAG, "does not find the current location");
            e.printStackTrace();

            place.setLatitude(location.getLatitude());
            place.setLongitude(location.getLongitude());
            place.setZoom(DEFAULT_ZOOM);
            place.setTitle(title);
            place.setDescription(description.toString());

            place = dataSource.updateCreate(place);

            Log.i(LOGTAG, "data is created with id: " + place.getId());
        }
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub

    }

通过将 "this" 放入 Geocoder 的初始化中，它给我一个明显的错误，我还构建了构造函数，但它也给了我一个运行时间错误。请告诉我应该用地理编码器做什么。谢谢

Answer 1

改变这个：

Geocoder geo = new Geocoder(this);

对此：

Geocoder geo = new Geocoder(getApplicationContext());

如何在子类中使用 Geocoder

How Geocoder is used in subclass

java

android

google-maps

google-geocoder

android-activity