ContactListView.java

package com.cellasoft.univrapp.widget;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.ListAdapter;
import com.cellasoft.univrapp.utils.UIUtils;

public class ContactListView extends BasePullListView<ContactItemInterface> {

    protected boolean mIsFastScrollEnabled = false;
    protected IndexScroller mScroller = null;
    protected GestureDetector mGestureDetector = null;

    // additional customization
    protected boolean inSearchMode = false; // whether is in search mode
    protected boolean autoHide = true; // alway show the scroller

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

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

    @Override
    protected void init(Context context) {
        super.init(context);
        this.setChoiceMode(CHOICE_MODE_SINGLE);
        this.setVerticalScrollBarEnabled(false);
    }

    public IndexScroller getScroller() {
        return mScroller;
    }

    public boolean isInSearchMode() {
        return inSearchMode;
    }

    public void setInSearchMode(boolean isInSearchMode) {
        this.inSearchMode = isInSearchMode;
    }

    @Override
    public boolean isFastScrollEnabled() {
        return mIsFastScrollEnabled;
    }

    @Override
    public void setFastScrollEnabled(boolean enabled) {
        mIsFastScrollEnabled = enabled;
        if (mIsFastScrollEnabled) {
            if (mScroller == null) {
                createScroller();
            }
        } else {
            if (mScroller != null) {
                mScroller.hide();
                mScroller = null;
            }
        }
    }

    // override this if necessary for custom scroller
    public void createScroller() {
        mScroller = new IndexScroller(getContext(), this);
        mScroller.setAutoHide(autoHide);
        mScroller.setShowIndexContainer(true);

        if (autoHide)
            mScroller.hide();
        else
            mScroller.show();
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);

        // Overlay index bar
        if (!inSearchMode) // dun draw the scroller if not in search mode
        {
            if (mScroller != null)
                mScroller.draw(canvas);
        }

    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        if (inSearchMode)
            return false;
        // Intercept ListView's touch event
        if (mScroller != null && mScroller.onTouchEvent(ev))
            return true;

        if (mGestureDetector == null) {
            mGestureDetector = new GestureDetector(getContext(),
                    new GestureDetector.SimpleOnGestureListener() {

                        @Override
                        public boolean onFling(MotionEvent e1, MotionEvent e2,
                                               float velocityX, float velocityY) {
                            // If fling happens, index bar shows
                            mScroller.show();
                            return super.onFling(e1, e2, velocityX, velocityY);
                        }

                    });
        }
        mGestureDetector.onTouchEvent(ev);

        return super.onTouchEvent(ev);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (isHeader(ev) || isImageThumb(ev)) {
            return false;
        }
        return false;
    }

    @Override
    public void setAdapter(ListAdapter adapter) {
        super.setAdapter(adapter);
        if (mScroller != null)
            mScroller.setAdapter(adapter);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        if (mScroller != null)
            mScroller.onSizeChanged(w, h, oldw, oldh);
    }

    private boolean isHeader(MotionEvent ev) {
        return 0 == pointToPosition((int) ev.getX(), (int) ev.getY());
    }

    private boolean isImageThumb(MotionEvent ev) {
        return ev.getX() <= UIUtils.getTouchAddition(getContext());
    }

}