本文实例讲述了android编程重写viewgroup实现卡片布局的方法。分享给大家供大家参考,具体如下:
实现效果如图:
实现思路
1. 重写onmeasure(int widthmeasurespec, int heightmeasurespec)设置每个子view的大小
2. 重写onlayout(boolean changed, int l, int t, int r, int b) 设置每个子view的位置
第一步:新建flowlayout继承viewgroup
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package com.rong.activity;
import android.content.context;
import android.util.attributeset;
import android.view.view;
import android.view.viewgroup;
/**
* 卡片布局
*
* @author 徐荣
*
*/
public class flowlayout extends viewgroup {
public flowlayout(context context, attributeset attrs) {
super (context, attrs);
}
@override
protected void onlayout( boolean changed, int l, int t, int r, int b) {
// 当前子view的数量
int childsize = getchildcount();
// 获取行宽
int linewidth = getmeasuredwidth();
// 当前是第几行
int lines = 1 ;
// 当前累加的行宽
int nowlinewidth = 0 ;
for ( int i = 0 ; i < childsize; i++) {
view view = getchildat(i);
// 子view的宽度
int childwidth = view.getmeasuredwidth();
// 子view的高度
int childheight = view.getmeasuredheight();
// 如果当前的nowlinewidth+childwidth>= linewidth 则换行
if (nowlinewidth + childwidth >= linewidth) {
nowlinewidth = 0 ;
lines = lines + 1 ;
}
// 设置子view的位置
view.layout(nowlinewidth, childheight * (lines - 1 ), nowlinewidth + childwidth, childheight * lines);
nowlinewidth = nowlinewidth + childwidth;
// 如果nowlinewidth >= linewidth 则换行
if (nowlinewidth >= linewidth) {
nowlinewidth = 0 ;
lines = lines + 1 ;
}
}
}
@override
protected void onmeasure( int widthmeasurespec, int heightmeasurespec) {
super .onmeasure(widthmeasurespec, heightmeasurespec);
// 设置自己view的大小
setmeasureddimension(widthmeasurespec, heightmeasurespec);
for ( int i = 0 ; i < getchildcount(); i++) {
view view = getchildat(i);
// 设置每个子view的大小
view.measure(view.getmeasuredwidth(), view.getmeasuredheight());
}
}
}
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第二步:新建布局文件
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<?xml version= "1.0" encoding= "utf-8" ?>
<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android"
android:layout_width= "match_parent"
android:layout_height= "match_parent"
android:background= "@android:color/black"
android:orientation= "vertical" >
<com.rong.activity.flowlayout
android:layout_width= "match_parent"
android:layout_height= "match_parent"
android:background= "#ffffff" >
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "apple" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "button" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "cup" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "double" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "ear" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "flower" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "game" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "hotdog" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "interseting" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "joker" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "king" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "mother" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "lost" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "noting" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "orange" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "poker" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "qustion" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "ring" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "string" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "type" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "unit" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "vertion" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "west" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "x" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "young" />
<button
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:text= "zip" />
</com.rong.activity.flowlayout>
</relativelayout>
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运行!
希望本文所述对大家android程序设计有所帮助。