ViewGroup自定義布局（左上右下）

布局檔案

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    tools:context="com.test.myviewgroup.MainActivity" >
    <com.test.myviewgroup.MyViewGroup 
        android:layout_height="match_parent"
        android:layout_width="match_parent">
          <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="吭吭" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="咳咳" />
     <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="吭吭" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="咳咳" />
    </com.test.myviewgroup.MyViewGroup>

</RelativeLayout>
           

繼承自ViewGroup的類

package com.test.myviewgroup;

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

public class MyViewGroup extends ViewGroup{
    private int width;
    private int height;
    public MyViewGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

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

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        View child1=getChildAt();
        View child2=getChildAt();
        View child3=getChildAt();
        View child4=getChildAt();
        if(child1!=null){
            child1.layout(,, child1.getMeasuredWidth(), child1.getMeasuredHeight());
        }
        if(child2!=null){
            child2.layout(child1.getMeasuredWidth(),child1.getMeasuredHeight(), child1.getMeasuredWidth()+child2.getMeasuredWidth(), child1.getMeasuredHeight()+child2.getMeasuredHeight());
        }
        if(child3!=null){
            child3.layout(child1.getMeasuredWidth()+child2.getMeasuredWidth(), child1.getMeasuredHeight()+child2.getMeasuredHeight(), child3.getMeasuredWidth()+child1.getMeasuredWidth()+child2.getMeasuredWidth(),  child3.getMeasuredHeight()+child1.getMeasuredHeight()+child2.getMeasuredHeight());
        }
        if(child4!=null){
            child4.layout(child3.getMeasuredWidth()+child1.getMeasuredWidth()+child2.getMeasuredWidth(),child3.getMeasuredHeight()+child1.getMeasuredHeight()+child2.getMeasuredHeight(), child3.getMeasuredWidth()+child1.getMeasuredWidth()+child2.getMeasuredWidth()+child4.getMeasuredWidth(), child4.getMeasuredHeight()+child3.getMeasuredHeight()+child1.getMeasuredHeight()+child2.getMeasuredHeight());
        }


//      int left=0;
//      int top=0;
//      for(int i=0;i<getChildCount();i++){
//          View child=getChildAt(i);
//          child.layout(left, top,child.getMeasuredWidth(), child.getMeasuredHeight());
//      }
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // TODO Auto-generated method stub
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        width=getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        height=getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);
        measureChildren(width, height);
    }

}
           

主類

package com.test.myviewgroup;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }   
}
           

效果圖