HeaderUntouchableListView

HeaderUntouchableListView.java

/**
 * listView with header untouchable
 * Created by ninja on 8/3/16.
 */
public class HeaderUntouchableListView extends ListView {
    private View mHeaderView;
    private boolean isDownEventConsumed;

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

    @Override
    public void addHeaderView(View v) {
        super.addHeaderView(v);
        this.mHeaderView = v;
    }

    @Override
    public void addHeaderView(View v, Object data, boolean isSelectable) {
        super.addHeaderView(v, data, isSelectable);
        this.mHeaderView = v;
    }

    /**
     * list header should not consume the event, and list item should consume the event
     * consumed here is replaced with super.dispatchTouchEvent(motionEvent)
     * @param motionEvent
     * @return is event consumed
     */
    @Override
    public boolean dispatchTouchEvent(MotionEvent motionEvent) {
        if(mHeaderView == null) return super.dispatchTouchEvent(motionEvent);
        if(motionEvent.getAction() == MotionEvent.ACTION_DOWN){
            //if touch header not to consume the event
            Rect rect = new Rect((int) mHeaderView.getX(), (int) mHeaderView.getY(), mHeaderView.getRight(), mHeaderView.getBottom());
            if(rect.contains((int)motionEvent.getX(), (int)motionEvent.getY())){
                isDownEventConsumed = false;
                return isDownEventConsumed;
            }else {
                isDownEventConsumed = true;
                return super.dispatchTouchEvent(motionEvent);
            }
        }else{
            //if touch event not consumed, then move/up event should be the same
            if(!isDownEventConsumed)return isDownEventConsumed;
            return super.dispatchTouchEvent(motionEvent);
        }
    }
}