How to get “Never ask Again” option in runtime permission

问题

In my app I have created a class name Untility where I wrore the code for permission of READ_EXTERNAL_STORAGE. But the problem is when I click Deny on the app, I am not finding the alert notification to set it allow again. Initialy I have the option "Never ask Again". Once I clicked on it, the dialog desapperas. and now after running the app if I click on deny, I cannot find Dialog message anymore to make it allow again. How can I modify my code to show this message every time.

My Utility Class is

public class Utility {

public static final int MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE = 123;

@TargetApi(Build.VERSION_CODES.M)
public static boolean checkPermission(final Context context) {
    int currentAPIVersion = Build.VERSION.SDK_INT;
    if (currentAPIVersion >= android.os.Build.VERSION_CODES.M) {
        if (ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, Manifest.permission.READ_EXTERNAL_STORAGE)) {
                Log.v("TAG", "Permission is granted");
            }
            else {
                ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
            }
            return false;
        } else {
            return true;
        }
    } else {
        return true;
    }
 }

My Another class here I am calling the Utility class is

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    switch (requestCode) {
        case Utility.MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                if(userChoosenTask.equals("Take Photo"))
                    cameraIntent();
                else if(userChoosenTask.equals("Choose from Library"))
                    galleryIntent();

                    //do something here
            } else {
                //code for deny
                Toast.makeText(DetailMyColleague.this, "Permission Denied", Toast.LENGTH_SHORT).show();
            }
            break;
    }
}
private void selectImage() {
    final CharSequence[] items = { "Take Photo", "Choose from Library",
            "Cancel" };

    AlertDialog.Builder builder = new AlertDialog.Builder(DetailMyColleague.this);
    builder.setTitle("Add Photo!");
    builder.setItems(items, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int item) {
            boolean result=Utility.checkPermission(DetailMyColleague.this);

            if (items[item].equals("Take Photo")) {
                userChoosenTask ="Take Photo";
                if(result)
                    cameraIntent();

            } else if (items[item].equals("Choose from Library")) {
                userChoosenTask ="Choose from Library";
                if(result)
                    galleryIntent();

            } else if (items[item].equals("Cancel")) {
                dialog.dismiss();
            }
        }
    });
    builder.show();
}
private void galleryIntent()
{
    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);//
    startActivityForResult(Intent.createChooser(intent, "Select File"),SELECT_FILE);
}
private void cameraIntent()
{
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    startActivityForResult(intent, REQUEST_CAMERA);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == Activity.RESULT_OK) {
        if (requestCode == SELECT_FILE)
            onSelectFromGalleryResult(data);
        else if (requestCode == REQUEST_CAMERA)
            onCaptureImageResult(data);
    }
}

private void onCaptureImageResult(Intent data) {
    Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);

    File destination = new File(Environment.getExternalStorageDirectory(),
            System.currentTimeMillis() + ".jpg");

    FileOutputStream fo;
    try {
        destination.createNewFile();
        fo = new FileOutputStream(destination);
        fo.write(bytes.toByteArray());
        fo.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    profilePic.setImageBitmap(thumbnail);
}
@SuppressWarnings("deprecation")
private void onSelectFromGalleryResult(Intent data) {

    Bitmap bm=null;
    if (data != null) {
        try {
            bm = MediaStore.Images.Media.getBitmap(getApplicationContext().getContentResolver(), data.getData());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    profilePic.setImageBitmap(bm);
}

回答1:

You cannot show the same Request message once they say "don't ask again", but you can check for the permission, and if denied, show a custom dialog that directs them to the settings page with an intent:

startActivityForResult(new Intent(android.provider.Settings.ACTION_SETTINGS), 0);

If you permission check fails:

if (ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
    // show a dialog
    new AlertDialog.Builder(this).setMessage("You need to enable permissions to use this feature").setPositiveButton("Go to settings", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            // navigate to settings
            startActivityForResult(new Intent(android.provider.Settings.ACTION_SETTINGS), 0);
        }
    }).setNegativeButton("Go back", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            // leave?
            MyActivity.this.onBackPressed();
        }
    }).show();
}

回答2:

How can I modify my code to show thi message every time.

You can't. If the user checked "Don't ask again", then the only way the user can grant permission is via the Settings app. Once the user checks "don't ask again" and denies the permission, you cannot display the permission dialog for any permission in that permission group.

回答3:

The "Don't ask again" checkbox is visible only after more than one deny per permission code. If you check "Don't ask again" and click on Deny then permission will be automatically denied. If you want to choose again, go to the "App info" page of your application and clear data storage of your app. Now, if you go back in your app and request permission again. Then, the default permission dialog is showing. You can see documentation here.

来源：https://stackoverflow.com/questions/45353495/how-to-get-never-ask-again-option-in-runtime-permission