android抽屜SlidingDrawer——wrap_content非全屏

本文地址：http://blog.csdn.net/you_and_me12/article/details/7327030

SlidingDrawer的用法比較多，就不說明了。

如果設定了屬性layout_height="wrap_content"是不起作用的，在原來的SlidingDrawer中的onMeasure()方法使得layout_height一直都是fill_parent，但是使用layout_height="固定高度"也是可以！

以下重寫SlidingDrawer，實現如下(右圖效果)：

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貼代碼

/** * 使得SlidingDrawer在螢幕低端，而不會填滿整個螢幕 * @author akai 2012-03-06 */public class WrapSlidingDrawer extends SlidingDrawer {    private boolean mVertical;    private int mTopOffset;        public WrapSlidingDrawer(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        int orientation = attrs.getAttributeIntValue("android", "orientation", ORIENTATION_VERTICAL);        mTopOffset = attrs.getAttributeIntValue("android", "topOffset", 0);        mVertical = (orientation == SlidingDrawer.ORIENTATION_VERTICAL);    }    public WrapSlidingDrawer(Context context, AttributeSet attrs) {        super(context, attrs);        int orientation = attrs.getAttributeIntValue("android", "orientation", ORIENTATION_VERTICAL);        mTopOffset = attrs.getAttributeIntValue("android", "topOffset", 0);        mVertical = (orientation == SlidingDrawer.ORIENTATION_VERTICAL);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);        int widthSpecSize =  MeasureSpec.getSize(widthMeasureSpec);        int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);        int heightSpecSize =  MeasureSpec.getSize(heightMeasureSpec);        final View handle = getHandle();        final View content = getContent();        measureChild(handle, widthMeasureSpec, heightMeasureSpec);        if (mVertical) {            int height = heightSpecSize - handle.getMeasuredHeight() - mTopOffset;            content.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(height, heightSpecMode));            heightSpecSize = handle.getMeasuredHeight() + mTopOffset + content.getMeasuredHeight();            widthSpecSize = content.getMeasuredWidth();            if (handle.getMeasuredWidth() > widthSpecSize) widthSpecSize = handle.getMeasuredWidth();        }        else {            int width = widthSpecSize - handle.getMeasuredWidth() - mTopOffset;            getContent().measure(MeasureSpec.makeMeasureSpec(width, widthSpecMode), heightMeasureSpec);            widthSpecSize = handle.getMeasuredWidth() + mTopOffset + content.getMeasuredWidth();            heightSpecSize = content.getMeasuredHeight();            if (handle.getMeasuredHeight() > heightSpecSize) heightSpecSize = handle.getMeasuredHeight();        }        setMeasuredDimension(widthSpecSize, heightSpecSize);    }}

注釋：本代碼可以直接使用，不需修改，使用是把原來的<SlidingDrawer>標籤修改為<packageName.WrapSlidingDrawer>即可。