Android PermissionsDispatch library returning null on location and not generating permisions

Question

I got tired of playing around with the new permission system in Android and as such started to look for other options. The permissionsDispatch library seems amazing but I can't get it to work. I have been trying for the past two hours to get the code to work to no avail. It is a fairly small and simple example:

@RuntimePermissions
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {

    private static final int MY_REQUEST_PERMISSION_COARSE_LOCATION = 45;
    public static final String TAG = "MAINACTIVITYITS";
    GoogleApiClient mGoogleApiClient;
    Location mLastLocation;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        GoogleApiBuilder();

    }

    public void GoogleApiBuilder() {
        // Create an instance of GoogleAPIClient.
        if (mGoogleApiClient == null) {
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .addApi(LocationServices.API)
                    .build();
        }
    }

    @Override
    protected void onStart() {
        mGoogleApiClient.connect();
        super.onStart();
    }

    @Override
    protected void onStop() {
        mGoogleApiClient.disconnect();
        super.onStop();
    }
    @SuppressWarnings("MissingPermission")
    @NeedsPermission(Manifest.permission.ACCESS_FINE_LOCATION)
    public void mLocationSetter(){
        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        mLocationSetter();
        Log.i(TAG, mLastLocation.getLatitude() + "");
        Toast.makeText(this, mLastLocation.getLatitude() + "" , Toast.LENGTH_LONG).show();

    }

    @OnShowRationale(Manifest.permission.ACCESS_COARSE_LOCATION)
    public void locationRationale(PermissionRequest request){
        showRationaleDialog(R.string.permission_coarse_rationale, request);
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }

    @Override
    public void onLocationChanged(Location location) {

    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        // NOTE: delegate the permission handling to generated method
        MainActivityPermissionsDispatcher.onRequestPermissionsResult(this, requestCode, grantResults);
    }

    private void showRationaleDialog(@StringRes int messageResId, final PermissionRequest request){
        new AlertDialog.Builder(this)
                .setPositiveButton(R.string.button_allow, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        request.proceed();
                    }
                })
                .setNegativeButton(R.string.button_deny, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        request.cancel();
                    }
                })
                .setCancelable(false)
                .setMessage(messageResId)
                .show();

    }
}

My issue here comes from the mLastLocation instance variable returning null even after being annotated with the @NeedsPermission tag and the rationale is not showing at all. Basically, what I am trying to do is go by the same tutorial for getting the last known location inside Google https://developer.android.com/training/location/retrieve-current.html but using this library instead of having to write all the code for permissions. Am I missing something? All I want is the last known location.

Answer 1

尝试使用此库获取用户访问位置权限