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()); } } } |
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> |
运行!
希望本文所述对大家android程序设计有所帮助。