onTouchListener warning: onTouch should call View#performClick when a click is detected

Question

I have created a onTouchListener. Unfortunately onTouch() method throws me a warning:

com/calculator/activitys/Calculat         


        

Answer 1

In case you're not using a Custom View which explicitly overrides onPerformClick , the warning won't get removed by just following Secko's answer.

In addition to his answer, for doing the same on classes like android.widget.Button or Button you need to make a simple custom view which extends the target view.

Example :

The Custom View Class:

public class UselessButton extends AppCompatButton {
    public UselessButton(Context context) {
        super(context);
    }

    public UselessButton(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public UselessButton(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean performClick() {
        return super.performClick();
    }
}

XML :

Java :

    left.setOnTouchListener((v, event) -> {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            enLeft = 1;
            enRight = 0;
            return true;
        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            enLeft = 0;
            v.performClick();
            return false;
        } else {
            return false;
        }
    });

Current problems : Warning gets resolved by IDE, but can't see this practically performing click action on a real Android Device.

EDIT: Fixed getting the click event : Use View.setPressed(boolean)

down.setOnTouchListener((v, event) -> {
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
        enFront = 0;
        enBack = 1;
        left.setPressed(true);
        return true;
    } else if (event.getAction() == MotionEvent.ACTION_UP) {
        enBack = 0;
        v.performClick();
        v.setPressed(false);
        return false;
    } else {
        return false;
    }