Request Permission after selected option(either camera or gallery) from intent chooser in android

I have created an intent chooser containing Gallery, Photos and Camera apps. Now for the devices running on Android 6.0 or greater I want to ask the run time permissions after app is selected from chooser like if user selects gallery option I will ask storage permission only and in case if user select camera option I will ask camera and storage both permissions if not given before.

Can someone help me to do so?

Here is my code

public void openImageIntent() {
    File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String fname = "ABCD_" + timeStamp;
    final File sdImageMainDirectory = new File(storageDir, fname);
    fileUri = Uri.fromFile(sdImageMainDirectory);

    // Camera.
    final List<Intent> cameraIntents = new ArrayList<Intent>();
    final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    final PackageManager packageManager = getPackageManager();
    final List<ResolveInfo> listCam = packageManager.queryIntentActivities(captureIntent, 0);
    for (ResolveInfo res : listCam) {
        final String packageName = res.activityInfo.packageName;
        final Intent intent = new Intent(captureIntent);
        intent.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
        intent.setPackage(packageName);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
        cameraIntents.add(intent);
    }

    //Gallery.
    Intent galleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

    //Create the Chooser
    final Intent chooserIntent = Intent.createChooser(galleryIntent, "Select Source");

    chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[cameraIntents.size()]));


    startActivityForResult(chooserIntent, 65530);
}