自定义可拖拽GridView控件

1、概述

项目要求一个可拖拽的gridview功能，主要是可以长按图标，然后手指移动到对应位置，松开后图标移动到对应手指松开的位置，后面的图标依次挪移一个position。

2、效果图

第一张图片是拖拽之前的效果图，第二张图片是拖拽后的效果图

3、重写dispatchTouchEvent方法

/**
 * 长按的Runnable
 */
private Runnable mLongClickRunable = new Runnable() {
    @Override
    public void run() {
        isDrag = true;
        //mVibrator.vibrate(200);
        //隐藏该item
        mDragView.setVisibility(INVISIBLE);
        //在点击的地方创建并显示item镜像
        createDragView(mDragBitmap, mDownX, mDownY);
    }
};
/**
 * 当moveY的值大于向上滚动的边界值，触发GridView自动向上滚动
 * 当moveY的值小于向下滚动的边界值，触犯GridView自动向下滚动
 * 否则不进行滚动
 */
private Runnable mScrollRunbale = new Runnable() {
    @Override
    public void run() {
        int scrollY = 0;
        if (mMoveY > mUpScrollBorder){
            scrollY = mSpeed;
            mHandler.postDelayed(mScrollRunbale,25);
        }else if (mMoveY < mDownScrollBorder){
            scrollY = -mSpeed;
            mHandler.postDelayed(mScrollRunbale,25);
        }else {
            scrollY = 0;
            mHandler.removeCallbacks(mScrollRunbale);
        }
        smoothScrollBy(scrollY,10);
    }
};

5、对外暴露的方法

/************************对外提供的接口***************************************/
public boolean isDrag() {
    return isDrag;
}
//设置是否可拖拽
public void setDrag(boolean drag) {
    isDrag = drag;
}
public long getDragResponseMs() {
    return mDragResponseMs;
}
//设置长按响应时长
public void setDragResponseMs(long mDragResponseMs) {
    this.mDragResponseMs = mDragResponseMs;
}
public void setOnItemChangeListener(OnItemChangeListener changeListener) {
    this.changeListener = changeListener;
}
/******************************************************************************/

6、如何在页面中调用

DragGridView dragGridView = findViewById(R.id.dgv);
dragGridView.setNumColumns(NUM_COLUMNS);
initData();
mMoreColorTypeAdapter = new MoreColorTypeAdapter(this, true, data, NUM_COLUMNS);
dragGridView.setAdapter(mMoreColorTypeAdapter);
dragGridView.setOnItemClickListener(this);
dragGridView.setOnItemChangeListener(new DragGridView.OnItemChangeListener() {
    @Override
    public void onChange(int from, int to) {
        Data dataBean = data.get(from);
        //直接交互
        //Collections.swap(dataSourceList,from,to);
        //非直接交互 这里的处理需要注意下 排序交换
        if(from < to){
            for(int i = from; i < to; i++){
                Collections.swap(data, i, i + 1);
            }
        }else if(from > to){
            for(int i = from; i > to; i--){
                Collections.swap(data, i, i - 1);
            }
        }
        data.set(to, dataBean);
        mMoreColorTypeAdapter.notifyDataSetChanged();
    }
    @Override
    public void onStop() {
        //拖动停止
    }
});

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