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我尝试从 MyLocationOverlay 提供的经度和纬度获取当前邮政编码,并将其设置为我的 Activity 上的 EditView。

当我尝试从 MyLocationOverlay 获取经度和纬度时,Activity 崩溃。

这段代码有什么问题?

问候,浮动

LogCat 输出:http ://codepaste.net/vs6itk 第 59 行是以下行:

 double currentLatitude = myLocationOverlay.getMyLocation().getLatitudeE6(); 

这是我的代码:

protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.partner_suche);

    final EditText tView = (EditText) findViewById(R.id.editTextPLZ);
    final MapView mView = (MapView) findViewById(R.id.mapview);
    mView.getController().setZoom(14);

    List<Overlay> mapOverlays = mView.getOverlays();

    myLocationOverlay = new MyCustomLocationOverlay(this, mView);
    mapOverlays.add(myLocationOverlay);
    myLocationOverlay.enableMyLocation();
    myLocationOverlay.enableCompass();
    myLocationOverlay.runOnFirstFix(new Runnable() {
        public void run() {
            mView.getController().animateTo(myLocationOverlay.getMyLocation());
        }
    });

    Geocoder gc = new Geocoder(this, Locale.getDefault());
    double currentLatitude = myLocationOverlay.getMyLocation().getLatitudeE6();
    double currentLongitute = myLocationOverlay.getMyLocation().getLongitudeE6();

    try 
    {
        List<Address> addresses = gc.getFromLocation(currentLatitude, currentLongitute, 1);
        if (addresses.size() > 0) 
        {
            tView.setText(addresses.get(0).getLocality());
        }
    } catch (IOException e) 
    {

    }
}

编辑:我创建了一个 LocationListener 来获取我当前的位置。现在,我尝试运行 gc.getFromLocation(latitude, longitude, 1); 我看不懂异常?:/

LocationManager locationManager;
    String context = Context.LOCATION_SERVICE;
    locationManager = (LocationManager)getSystemService(context);
    String provider = LocationManager.GPS_PROVIDER;

    LocationListener locationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
            updateWithNewLocation(location);
            } 

        public void onProviderDisabled(String provider){
            updateWithNewLocation(null);
            }
        public void onProviderEnabled(String provider){ }
        public void onStatusChanged(String provider, int status,Bundle extras){ }
        };

    locationManager.requestLocationUpdates(provider, 0, 0, locationListener);

private void updateWithNewLocation(Location location) {
    final EditText tView = (EditText) findViewById(R.id.editTextPLZ);
    double latitude = location.getLatitude();
    double longitude = location.getLongitude();

    Geocoder gc = new Geocoder(this, Locale.getDefault());
    if (location != null) {
        try 
        {
            List<Address> addresses = gc.getFromLocation(latitude, longitude, 1);
            if (addresses.size() > 0) 
            {
                Address address = addresses.get(0);
                for (int i = 0; i < address.getMaxAddressLineIndex(); i++){
                    tView.setText(address.getPostalCode());
                }
            }
        } catch (Exception e) 
        {

        }
    }

}
4

2 回答 2

0

如果您使用的是模拟器 API 级别 8 或 9,并收到异常:

java.io.IOException:服务不可用

那么这是一个已知的错误,请参阅服务不可用

不过,它在真实设备和 7 级模拟器上运行良好。(您可能也应该在地址为空时设置陷阱,尽管这不会使地理编码器工作!)

于 2011-05-03T12:34:39.733 回答
0

最有可能返回的位置

myLocationOverlay.getMyLocation()

或者

Location location = locationManager.getLastKnownLocation(provider);

一片空白。可能是由于您的应用程序尚未收到位置修复,并且没有以前保存的位置。

尝试将执行地理编码的代码块移动到收到修复后运行的可运行文件中。像这样:

myLocationOverlay.runOnFirstFix(new Runnable() {
    public void run() {
        Location loc = myLocationOverlay.getMyLocation();
        if (loc != null) {
            mView.getController().animateTo(loc);
            Geocoder gc = new Geocoder(this, Locale.getDefault());
            double currentLatitude = loc.getLatitudeE6();
            double currentLongitute = loc.getLongitudeE6();

            try 
            {
                List<Address> addresses = gc.getFromLocation(currentLatitude, currentLongitute, 1);
                if (addresses.size() > 0) 
                {
                    tView.setText(addresses.get(0).getLocality());
                }
            } catch (IOException e) 
            {

            }
        }
    }
});
于 2011-05-03T14:24:55.470 回答