将纬度和经度值设置为文本框

时间:2012-07-19 05:39:28

标签: java android locationmanager

  

可能重复:
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我正在使用Android,我希望在另一个文本框中显示文本框中的当前纬度值和当前经度值。我写了下面的代码,但它没有用。它没有在相应的文本框中设置任何纬度或经度值。我的代码有什么问题吗?

public class MainActivity extends Activity implements LocationListener {
    private TextView latituteField;
    private TextView longitudeField;
    private LocationManager locationManager;
    private String provider;

    private static final String TAG = "CurrentLocation";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        latituteField = (TextView) findViewById(R.id.lat1);
        longitudeField = (TextView) findViewById(R.id.lat2);

     // Get the location manager
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        // Define the criteria how to select the location provider -> use
        // default
        Criteria criteria = new Criteria();
        provider = locationManager.getBestProvider(criteria, false);
        locationManager.requestLocationUpdates(provider, 0, 0, this);
        Location location = locationManager.getLastKnownLocation(provider);
        onLocationChanged(location);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        locationManager.removeUpdates(this);
    }

    @Override
    public void onLocationChanged(Location location) {
       if (location != null) {
           System.out.println("Provider " + provider + " has been selected.");
           int lat = (int) (location.getLatitude());
           int lng = (int) (location.getLongitude());
           Log.e("GPS", "location changed: lat="+lat+", lon="+lng);
           latituteField.setText(String.valueOf(lat));
           longitudeField.setText(String.valueOf(lng));
       } else {
           latituteField.setText("Provider not available");
           longitudeField.setText("Provider not available");
       }
    }

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

    }

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

    }

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

    }
}

或者我需要做一些事情,例如从somwhere传递纬度或经度值?或者它会自动获取当前位置值?

我在清单文件中有这些 -

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
    <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
    <uses-permission android:name="android.permission.CONTROL_LOCATION_UPDATES" />
    <uses-permission android:name="android.permission.INTERNET" />

我还需要添加其他东西吗?

当我在logCAT

中看到时,我也遇到了这个错误
07-18 22:43:59.836: E/Trace(3410): error opening trace file: No such file or directory (2)

我正在Provider Not Available进入我的文本框,因为它将转向其他循环。

2 个答案:

答案 0 :(得分:1)

正如您在comment中提到的那样,您正在运行来自eclipse的代码。让我告诉你,无法在Eclipse中获取真正的GPS Co-Ordinates。但是,您可以通过将.gpx文件加载到DDMS来模拟它。

为了同样的目的,请访问我的answer

答案 1 :(得分:0)

int lat = (int) (location.getLatitude());
           int lng = (int) (location.getLongitude());

你应该有两个而不是int,你知道lat,longs是double,你只是取整数部分。即使在小数点后4位,位置也会发生变化。