Intercepting touch on a fragment

Question

I was using MVP in a previous application with my View component essentially an RelativeLayout.

Anytime I would want to block any touch interaction on the RelativeLayout (for example while a network access) I would return true from touchIntercept like this.

public abstract class RootView<T> extends RelativeLayout implements BaseView<T> {

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (mIsScreenLocked)
            return true;
        else
            return super.onInterceptTouchEvent(ev);
    }

  @Override
public void showProgress(boolean show, boolean lockScreen) {
    ProgressBar progressBar = ((ProgressBar) findViewById(R.id.progress_bar));

    if (progressBar != null) {
        if (show) {
            progressBar.setVisibility(View.VISIBLE);
        } else {
            progressBar.setVisibility(View.GONE);
        }
    }
    mIsScreenLocked = lockScreen;
    freezeBottomBar(show);

}
}

In my new application my views are Fragments , the base of which extends a fragment

public abstract class BaseFragment
{

}

I would like to achieve something similar , to block all touch interactions on the fragment when a user initiates any network access.

public abstract class BaseFragment
    {

@Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mIsScreenLocked = true;
        initializeControls();
        attachListeners();

        if (savedInstanceState == null)
            onScreenInitializationComplete(getArguments());
        else
            onScreenInitializationComplete(getArguments(), savedInstanceState);

        ***createTouchInterceptor***(view);

        //should we run ignition here?
    }

    private void createTouchInterceptor(View fragmentView) {
        fragmentView.setOnTouchListener((view, motionEvent) -> {
            if (mIsScreenLocked)
                return true;
            else
                return false;
        });

    }     
    }

This ofcourse wont work , since when a button is pressed on the fragment , the button would receive the touch.

Any ideas?

score 0 · Answer 1 · answered Dec 20 '17 at 17:48

0

I am not sure that this is the best idea from a UX point of view, since the user doesn't really know why his/her actions are doing nothing, but for the sake of answering the question you can either

Use the same solution as you did for the RelativeLayout with the top container ViewGroup in your fragment's view.
disable setEnabled(false) only the "clickable" views, like buttons...etc, other views like TextViews and such, don't need to be disabled
- Use an overlay transparent view, a view that is fully transparent over your root view that consumes the events in case of your fragment being disbaled.

However, you might want to consider a different approach such as

Showing a blocking progress dialog
Only disabling the button in question and let the user touch other views

answered Dec 20 '17 at 17:48

elmorabea

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I agree with you when you say that the user would be lost and would think that the application has stuck. I actually skipped some code in the snippet. I did display a progress dialog. As you can see the showProgress method was the one which instructed the view to start intercepting. I like your blocking progress dialog suggestion. Never heard of it before. Any pointers? – Muhammad Ahmed AbuTalib Dec 20 '17 at 17:52
use setCanceledOnTouchOutside(false), setCancellable(false) on your progress dialog – elmorabea Dec 20 '17 at 17:55
elmorbea. Thanks for your aid. I however took the approach listed here as the selected answerhttps://stackoverflow.com/questions/36918219/how-to-disable-user-interaction-while-progressbar-is-visible-in-android – Muhammad Ahmed AbuTalib Dec 20 '17 at 18:04

Intercepting touch on a fragment

1 Answers1