Android中GridView的书架效果实现

其实书架效果很好实现的，只要在自定义的GridView中的onDraw（）方法中计算下书架的位置矩形，然后draw出来就OK，个人认为比较简单。

代码如下：

public class PlaybackFocusedGridView extends FocusedGridView {
Drawable mInterlayer = this.getResources().getDrawable(R.drawable.tv_playback_shelf);//书架图片
Rect mMyDrawRect = new Rect();//书架的矩形位置

public PlaybackFocusedGridView(Context contxt, AttributeSet attrs, int defStyle) {
super(contxt, attrs, defStyle);
}

public PlaybackFocusedGridView(Context contxt, AttributeSet attrs) {
super(contxt, attrs);
}

public PlaybackFocusedGridView(Context contxt) {
super(contxt);
}

@Override
protected void onDraw(Canvas canvas) {
int count = getChildCount();
if (count > 0) { //当有内容时
View v = getChildAt(0);//获取屏幕的第一个可见的View

if (v != null) {
int gridview_height = this.getHeight();
int interlayerHeight = mInterlayer.getIntrinsicHeight();
int blockGapHeight = v.getHeight();
mMyDrawRect.left = 0;
mMyDrawRect.right = getWidth();
int initPos = v.getTop();

for (int i = initPos; i <= gridview_height; i += blockGapHeight) {
mMyDrawRect.top = i;
mMyDrawRect.bottom = mMyDrawRect.top + interlayerHeight;
mInterlayer.setBounds(mMyDrawRect);
mInterlayer.draw(canvas);//画书架图片
}
}

super.onDraw(canvas);//画每一个Item
}
}
}

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