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AutoFollowBox

2024-11-02 00:50:02   206人阅读

如果你有个Button或者view希望跟随Listview，GridView，并且要求adapter高度自适应，达到自动跟随的效果，那这个是个不错的方法
标签： Android

[1].[文件] AutoFollowBox.java ~ 4KB    下载(8) 跳至 [1]

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packagecom.phodev.andtools.widget;
 
importandroid.content.Context;
importandroid.graphics.Rect;
importandroid.util.AttributeSet;
importandroid.view.View;
importandroid.view.ViewGroup;
 
/**
 * 由于ListView，Gridiew,等高度设置为wrap_content的时候会有问题，如果此时下面还有其他view，
 * 当AdapterView的item很多的上海，不仅scroll有问题,底部跟随的view也会跑到可是范围外
 *
 * <pre>
 * <com.phodev.widgets.AutoFollowBox>
 *      <ListView
 *       android:layout_width="fill_parent"
 *       android:layout_height="wrap_content"// 必须是wrap content,否则没有必要使用该组建，直接布局即可
 *      />
 *      <OtherView/>//有切只有有一个OtherView如果底部是多个View，可以放到一个布局里面。总是AutoFollowBox有切职能有两个Child
 * <com.phodev.widgets.AutoFollowBox/>
 * </pre>
 *
 * @author sky
 *
 */
publicclass AutoFollowBox extendsViewGroup {
 
    publicAutoFollowBox(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
 
    publicAutoFollowBox(Context context) {
        super(context);
    }
 
    privateRect marginInfo = newRect();
 
    @Override
    protectedvoid onLayout(booleanchanged, intl, intt, intr, intb) {
        intchildCount = getChildCount();
        intmaxW = r - l;
        intcl, ct, cr, cb;
        intheightOffset = 0;
        for(inti = 0; i < childCount; i++) {
            View v = getChildAt(i);
            getMargingInfo(v, marginInfo);
            cl = marginInfo.left;
            ct = marginInfo.top + heightOffset;
            cr = maxW - marginInfo.right;
            cb = ct + v.getMeasuredHeight();
            v.layout(cl, ct, cr, cb);
            heightOffset = cb + marginInfo.bottom;
        }
    }
 
    @Override
    protectedvoid onMeasure(intwidthMeasureSpec, intheightMeasureSpec) {
        intchildCount = getChildCount();
        if(childCount != 2) {
            thrownew RuntimeException(
                    "mast only 2 views is AutoFoolowAdapterViewBox");
        }
        //
        View stretchView = getChildAt(0);
        View followView = getChildAt(1);
        // start measure
        intoffsetBottom = 0;
        intfollowViewHeihgt = 0;
        if(followView.getVisibility() == View.VISIBLE) {
            LayoutParams lp = followView.getLayoutParams();
            measureChildWithMargins(followView, widthMeasureSpec, 0,
                    heightMeasureSpec,0);
            followViewHeihgt = followView.getMeasuredHeight();
            if(lp instanceofMarginLayoutParams) {
                MarginLayoutParams mlp = (MarginLayoutParams) lp;
                offsetBottom = mlp.topMargin + mlp.bottomMargin
                        + followViewHeihgt;
            }
        }
        //
        if(stretchView.getVisibility() == View.VISIBLE) {
            measureChildWithMargins(stretchView, widthMeasureSpec, 0,
                    heightMeasureSpec, offsetBottom);
        }
        //
        intmaxWantWitdh = Math.max(getMeasuerWidthWithMarging(followView),
                getMeasuerWidthWithMarging(stretchView));
        intmaxWantHeight = getMeasuerHeightWithMarging(stretchView)
                + getMeasuerHeightWithMarging(followView);
        //
        intmeasuredWidth = resolveSize(maxWantWitdh, widthMeasureSpec);
        intmeasuredHeight = resolveSize(maxWantHeight, heightMeasureSpec);
        setMeasuredDimension(measuredWidth, measuredHeight);
    }
 
    privateint getMeasuerHeightWithMarging(View v) {
        LayoutParams lp = v.getLayoutParams();
        inthAdd = 0;
        if(lp instanceofMarginLayoutParams) {
            MarginLayoutParams mlp = (MarginLayoutParams) lp;
            hAdd = mlp.topMargin + mlp.bottomMargin;
        }
        returnv.getMeasuredHeight() + hAdd;
    }
 
    privateint getMeasuerWidthWithMarging(View v) {
        LayoutParams lp = v.getLayoutParams();
        intwAdd = 0;
        if(lp instanceofMarginLayoutParams) {
            MarginLayoutParams mlp = (MarginLayoutParams) lp;
            wAdd = mlp.leftMargin + mlp.rightMargin;
        }
        returnv.getMeasuredWidth() + wAdd;
    }
 
    privatevoid getMargingInfo(View v, Rect out) {
        if(v != null&& v.getLayoutParams() instanceofMarginLayoutParams) {
            MarginLayoutParams mlp = (MarginLayoutParams) v.getLayoutParams();
            //
            out.set(mlp.leftMargin,//
                    mlp.topMargin,//
                    mlp.rightMargin,//
                    mlp.bottomMargin);
        }else{
            out.set(0,0,0,0);
        }
    }
 
    @Override
    protectedLayoutParams generateDefaultLayoutParams() {
        returnnew MarginLayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT);
    }
 
    @Override
    publicLayoutParams generateLayoutParams(AttributeSet attrs) {
        returnnew MarginLayoutParams(getContext(), attrs);
    }
}

AutoFollowBox


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