我想通过点击一个按钮来显示tvLatitude
和tvLongitude
(它们都是TextView
's)的经度和纬度。它不适用于我目前拥有的代码,你可以看到下面的代码。问题是,当控制到达字符串latitude = Double.toString(loc.getLatitude());
时,程序不幸地停止。 谁能告诉我为什么loc.getLatitude
和loc.getLongitude
没有响应?onLocationChanged()从未在Android中调用过
package mk.bukhari.loctrack;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import android.os.Build;
public class MainActivity extends ActionBarActivity implements LocationListener {
TextView tvLat, tvLon;
Button btnLoc;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
tvLat = (TextView) findViewById(R.id.tvLatitude);
tvLon = (TextView) findViewById(R.id.tvLongitude);
btnLoc = (Button) findViewById(R.id.btnLocation);
final LocationManager locman = (LocationManager)
getSystemService(LOCATION_SERVICE);
locman.requestLocationUpdates("gps", 0, 0, this);
btnLoc.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.d("LocTrack", "Button Clicked");
Location loc = locman.getLastKnownLocation("gps");
onLocationChanged(loc);
}
});
}
}
}
@Override
public void onLocationChanged(Location loc) {
Log.d("LocTrack", "Entering onLacationChanged");
String latitude = Double.toString(loc.getLatitude());
String longitude = Double.toString(loc.getLongitude());
Log.d("LocTrack", "Setting txt in tv");
tvLat.setText(latitude);
tvLon.setText(longitude);
}
@Override
public void onProviderDisabled(String arg0) {}
@Override
public void onProviderEnabled(String arg0) {}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {}
}
直到Log.d( “LocTrack”, “进入onLocationChanged”);此行程序按预期执行,输入onLocationChanged在logcat中显示,但应用程序停在它旁边,并显示一个对话框,指出“不幸LocTrak已停止” –
您可以发布您的logcat吗?所以我们可以知道有什么问题 –
对不起兄弟图片不上传指导我如何提供此图片 –