Code snippet to asko for system settings permission

Android6SettingsPermissions.java

new AlertDialog.Builder(this)
          .setMessage(R.string.write_settings_title)
          .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int which) {
                  Intent intent = new Intent(android.provider.Settings.ACTION_MANAGE_WRITE_SETTINGS);
                  intent.setData(Uri.parse("package:" + getPackageName()));
                  intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

                  try {
                      startActivity(intent);
                  } catch (Exception e) {
                      Log.e("Activity", "error starting permission intent", e);
                  }
              }
          })
          .show();