Android在等待位置时显示进度对话框

Question

I'm developing location based app using this example: http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/

But when I turn on phone, the location isn't available right on that moment. So I would like to show progress dialog while waiting for the location. Wanna do this in the background using AsyncTask.

Can you give any ideas how and where to do that?

Answer 1

不需要AsyncTask，因为Location服务已经在不同的进程中运行，只需实现LocationListener并在resume方法上注册它，并在onCreateActivity中检查location是否为null，显示ProgressDialog ，并在onLocationChanged()设置位置并关闭ProgressDialog

Answer 2

Place your ProgressDialog in onPreExecute, sample code below:

private ProgressDialog progressdialog;

@Override
protected void onPreExecute(){ 
   super.onPreExecute();
        progressdialog = new ProgressDialog(yourContext);
        progressdialog.setMessage("Loading...");
        progressdialog.show();    
}

@Override
protected void onPostExecute(){
   super.onPostExecute();
        progressdialog.dismiss();
}

Answer 3

Implement locationListner interface and start your wait dialog override onlocation change method and there just cancel the dialog, all the best.

public class MainActivity extends Activity implements LocationListener{

ProgressDialog dialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //-------------------- Start your GPS Reading ------------------ //
    dialog = new ProgressDialog(this);
    dialog.setMessage("Please wait!");
    dialog.show();

}
@Override
public void onLocationChanged(Location arg0) {
    dialog.dismiss();
}

@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

}

Answer 4

I wrote a solution for using ProgressDialog in AsyncTask on the following topic:

Displaying a ProgressDialog while waiting for a joined Thread