Android PermissionsDispatch庫在位置返回null且不生成權限

Question

我厭倦了在Android中使用新的權限系統，因此開始尋找其他選項。 PermissionsDispatch庫似乎很棒，但我無法使它正常工作。 在過去的兩個小時中，我一直在嘗試使代碼無法正常工作。 這是一個相當小而簡單的示例：

@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();

    }
}

我的問題是來自mLastLocation實例變量，即使在使用@NeedsPermission標記進行注釋之后，該變量仍返回null，並且根本不顯示其原理。 基本上，我想做的是通過同一教程來獲取Google https://developer.android.com/training/location/retrieve-current.html中的最后一個已知位置，但是使用此庫而不是編寫所有權限代碼。 我想念什么嗎？ 我想要的是最后一個已知的位置。

Answer 1

嘗試使用此庫獲取用戶訪問位置權限