自定义View之极简流式布局_recyclerview 自定义view流式布局-优快云博客

本文链接：https://blog.youkuaiyun.com/Android_Mr_Zhao/article/details/89552151

本文介绍了一个自定义的Android ViewGroup实现，名为liuView，它重写了onMeasure和onLayout方法来管理其子视图的布局。文章详细展示了如何测量和布局子视图，以适应不同的屏幕尺寸。

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import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

/*Time:2018/4/26
 *Author:zhaozhiwei
 *Description:
 */public class liuView extends ViewGroup {


    public liuView(Context context) {
        super(context);
    }

    public liuView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public liuView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        measureChildren(widthMeasureSpec,heightMeasureSpec);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {

        int leftMargin = 0;
        int topMargin = 0;
        for (int j = 0; j<getChildCount();j++){
            int measureHeight = getChildAt(j).getMeasuredHeight();
            int measuredWidth = getChildAt(j).getMeasuredWidth();
            if (leftMargin+measuredWidth>getWidth()){
                leftMargin=0;
                topMargin+=measureHeight;
            }
            getChildAt(j).layout(leftMargin,topMargin,measuredWidth+leftMargin,measureHeight+topMargin);
            leftMargin+=measuredWidth;
        }
    }
}