技术转载:android抽屉SlidingDrawer——wrap_content非全屏

转自:http://blog.csdn.net/you_and_me12/article/details/7327030

 

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):

 

                                                          技术转载:android抽屉SlidingDrawer——wrap_content非全屏_第1张图片                      

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);  
    }  
}  


注释:本代码可以直接使用,不需修改,使用是把原来的<SlidingDrawer>标签修改为<packageName.WrapSlidingDrawer>即可。

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