本文主要是介绍常用类继承自ViewGroup的写法，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
通常情况下要写一个自定义的类继承自ViewGroup，仅需重写OnLayout这个方法就可以了, 到时再需要再上来copy
public class MyViewGroup extends ViewGroup {
private final static int VIEW_MARGIN = 2;//定义一个边界值
private int maxWidth = 0;
private int maxHeight = 60;
public MyViewGroup(Context context) {
super(context);
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
for (int index = 0; index < getChildCount(); index++) {
final View child = getChildAt(index);
child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {
final int count = getChildCount();
int row = 0;// which row lay you view relative to parent
int lengthX = arg1; // right position of child relative to parent
int lengthY = arg2; // bottom position of child relative to parent
for(int i = 0 ; i < count ; i++){
final View child = this.getChildAt(i);
int width = child.getMeasuredWidth();
// int height = child.getMeasuredHeight();
int height = maxHeight; //限制子节点的高度
lengthX += width + VIEW_MARGIN;
lengthY = row * (height + VIEW_MARGIN) + VIEW_MARGIN + height + arg2;
if(width + VIEW_MARGIN > maxWidth){
maxWidth = width + VIEW_MARGIN;
}
if(lengthX > arg3){
lengthX = width + VIEW_MARGIN + arg1;
row ++;
lengthY = row * (height + VIEW_MARGIN) + VIEW_MARGIN + height + arg2;
}
child.layout(lengthX - width, lengthY - height, lengthX, lengthY);
}
}
}
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