I am trying to make a GPS android application which will use GPS and wify connection to find the location and show the coordinates when a button is clicked.
When I install and run it first time, it works fine; asks for permission and append the coordinates. But when I close it and run it again (disabling my location) it just shows the application interface and nothing happens when the button is clicked.
I am very new in programming and for coding I mostly used online references. Can anyone please suggest me what am I missing here?
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private Button button;
private TextView textView;
private LocationManager locationManager;
private LocationListener locationListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
textView = (TextView) findViewById(R.id.textView);
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
textView.append ("\n" + location.getLatitude() + ", " + location.getLongitude());
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
};
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{
Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.INTERNET
},10);
return;
}
} else {
configureButton();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode){
case 10:
if(grantResults.length>0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
configureButton();
return;
}
}
private void configureButton() {
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
locationManager.requestLocationUpdates("gps", 5000, 0, locationListener);
}
});
}
}
According to the docs requestPermission
Your MainActivity has to implement ActivityCompat.OnRequestPermissionsResultCallback
and register the callback to requestPermission
requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION,Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.INTERNET}, 10);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if ( ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.INTERNET
},10);
return;
}
else {
configureButton();//add this extra else to your code and it works.
}
} else {
configureButton();
}
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