Android抽屉SlidingDrawer——wrap_content非全屏

SlidingDrawer的用法比较多，就不说明了。

如果设置了属性layout_height="wrap_content"是不起作用的，在原来的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！

以下重写SlidingDrawer，实现如下效果图(右图效果)：

贴代码

/**
 * 使得SlidingDrawer在屏幕低端，而不会填满整个屏幕
 * @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);
    }
}