流式佈局(自定義控件)

1.創建MyViewGroup extends ViewGroup

package com.example.lsllayout;

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

/**
 * Created by Yangh-PC on 2017/11/30.
 */

public class MyViewGroup extends ViewGroup {
    public MyViewGroup(Context context) {
        this(context,null);
    }

    public MyViewGroup(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }

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

    }


    //測量


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

    //繪製的方法


    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }





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

        int currentWidth=0;
        int currentHeight=0;

        //得到子view的個數
        int  childCount=getChildCount();

        for (int  i=0;i<childCount;i++)
        {
            //得到這個viewGroup裏面的每一個子view
     View childView=getChildAt(i);
            //得到每一個view的寬高
            int width=childView.getMeasuredWidth();
            int height=childView.getMeasuredHeight();
            //確定子view的高度
            childView.layout(currentWidth,currentHeight,currentWidth+width,currentHeight+height);
          //累加所有的子view寬高
      currentWidth+=width;
            currentHeight+=height;


        }
}
}

2.佈局

<com.example.lsllayout.MyViewGroup
       android:layout_width="wrap_content"
       android:layout_height="wrap_content">


        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:padding="5dp"
            android:text="11111"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:padding="5dp"
            android:text="1111"/>



        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:padding="5dp"
            android:text="11111"/>


   </com.example.lsllayout.MyViewGroup>