Snippet/Android: Toggle GPS

Snippet_Android_ToggleGPS.java

//recordar activar permisos
//<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
private void toggleGPS(boolean enable) {
        String provider = Settings.Secure.getString(getContentResolver(), 
            Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
        if(provider.contains("gps") == enable) {
            return; // the GPS is already in the requested state
        }
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage("Esta aplicación necesita activar el GPS. ¿Desea activar el GPS?")
               .setCancelable(false)
               .setPositiveButton("Si", new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                	   //Toggle GPS
                	   final Intent poke = new Intent();
                       poke.setClassName("com.android.settings", 
                           "com.android.settings.widget.SettingsAppWidgetProvider");
                       poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
                       poke.setData(Uri.parse("3"));
                       getApplicationContext().sendBroadcast(poke);
                       //end
                   }
               })
               .setNegativeButton("No", new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                        //TrackActivity.this.finish();
                   }
               });
        AlertDialog alert = builder.create();
        alert.show();
    }