android - 如何使纬度和经度全局变量？

Question

我已经将纬度和经度设为全局变量。

它在 MyLocationListener 类中工作正常，因为它显示当前位置的纬度和经度，但是当它加载 url ( http://maps.google.com/maps?"+ "saddr="
+ 当前纬度 + ","+ 当前经度
+ "&daddr=27.11,85.11") ) 在 webview 中，它加载值 0 和 0。

为什么？

public class ShowMapActivity extends Activity {

private WebView webView;
double currentLattitude;
double currentLongtitude;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.webview);

    LocationManager mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    LocationListener mlocListener = new MyLocationListener();
    mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
            mlocListener);

    webView = (WebView) findViewById(R.id.webView1);
    webView.getSettings().setJavaScriptEnabled(true);
    webView.setWebViewClient(new WebViewClient());
    webView.loadUrl("http://maps.google.com/maps?" + "saddr="
            + currentLattitude + "," + currentLongtitude
            + "&daddr=27.11,85.11");

}

public class MyLocationListener implements LocationListener
{
    @Override
    public void onLocationChanged(Location loc)
    {
        currentLattitude = loc.getLatitude();

        currentLongtitude = loc.getLongitude();

        Toast.makeText(
                getApplicationContext(),

                "Latitude is: " + currentLattitude + " Longitude is: "
                        + currentLongtitude,

                Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onProviderDisabled(String provider)
    {

        Toast.makeText(getApplicationContext(),

        "Gps Disabled",

        Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onProviderEnabled(String provider)
    {

        Toast.makeText(getApplicationContext(), "Gps Enabled",

        Toast.LENGTH_SHORT).show();

    }

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

    }
}
}

Answer 1

尝试把这段代码放在onLocationChanged

webView = (WebView) findViewById(R.id.webView1); 
webView.getSettings().setJavaScriptEnabled(true); 
webView.setWebViewClient(new WebViewClient()); 
webView.loadUrl("http://maps.google.com/maps?" + "saddr=" 
        + currentLattitude + "," + currentLongtitude 
        + "&daddr=27.11,85.11");