When to request permission at runtime for Android Marshmallow 6.0?

Question

I am testing my app on Marshmallow 6.0 and it\'s getting force closed for the android.permission.READ_EXTERNAL_STORAGE, even if it is defined in th

Answer 1

    Android Easy Runtime Permissions with Dexter:
    1. Dexter Permissions Library

    To get started with Dexter, add the dependency in your build.gradle

    dependencies {
        // Dexter runtime permissions
        implementation 'com.karumi:dexter:4.2.0'
    }

    1.1 Requesting Single Permission
    To request a single permission, you can use withPermission() method by passing the required permission. You also need a PermissionListener callback to receive the state of the permission.

    > onPermissionGranted() will be called once the permission is granted.

    > onPermissionDenied() will be called when the permission is denied. Here you can check whether the permission is permanently denied by using response.isPermanentlyDenied() condition.

    The below code requests CAMERA permission.

Dexter.withActivity(this)
                .withPermission(Manifest.permission.CAMERA)
                .withListener(new PermissionListener() {
                    @Override
                    public void onPermissionGranted(PermissionGrantedResponse response) {
                        // permission is granted, open the camera
                    }

                    @Override
                    public void onPermissionDenied(PermissionDeniedResponse response) {
                        // check for permanent denial of permission
                        if (response.isPermanentlyDenied()) {
                            // navigate user to app settings
                        }
                    }

                    @Override
                    public void onPermissionRationaleShouldBeShown(PermissionRequest permission, PermissionToken token) {
                        token.continuePermissionRequest();
                    }
                }).check();

1.2 Requesting Multiple Permissions
To request multiple permissions at the same time, you can use withPermissions() method. Below code requests STORAGE and LOCATION permissions.

Dexter.withActivity(this)
                .withPermissions(
                        Manifest.permission.READ_EXTERNAL_STORAGE,
                        Manifest.permission.WRITE_EXTERNAL_STORAGE,
                        Manifest.permission.ACCESS_FINE_LOCATION)
                .withListener(new MultiplePermissionsListener() {
                    @Override
                    public void onPermissionsChecked(MultiplePermissionsReport report) {
                        // check if all permissions are granted
                        if (report.areAllPermissionsGranted()) {
                            // do you work now
                        }

                        // check for permanent denial of any permission
                        if (report.isAnyPermissionPermanentlyDenied()) {
                            // permission is denied permenantly, navigate user to app settings
                        }
                    }

                    @Override
                    public void onPermissionRationaleShouldBeShown(List permissions, PermissionToken token) {
                        token.continuePermissionRequest();
                    }
                })
                .onSameThread()
                .check();