How to ask runtime permissions for Camera in Android , Runtime storage permissions

Question

I am doing an application to scan barcodes on a button click and it was working fine up to Lollipop versions. When I came to Marshmallow it stopped working. This is the erro

Answer 1

This might help:

if (ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)
{
    if(ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, Manifest.permission.CAMERA))
    {
        AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
        alertBuilder.setCancelable(true);
        alertBuilder.setTitle("Permission necessary");
        alertBuilder.setMessage("CAMERA is necessary");
        alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
            @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
            public void onClick(DialogInterface dialog, int which) {
                ActivityCompat.requestPermissions((Activity) context, 
                new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUESTS);
            }
        });
        AlertDialog alert = alertBuilder.create();
        alert.show();
    } else {
        ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUESTS);
    }
    return false;
} else {
    return true;
}

Where MY_PERMISSIONS_REQUESTS is your final value of the request code.

It works just fine for me.