前言
小米加步枪,跑步进Android,还没来得及学习就直接项目了 - - # ,布局这块仍然是很麻烦的一块,先记录些问题吧。
正文
一、需求
动态切换View,即把grid.xml中的GridView动态添加到id为ContentView的LinearLayout中。
二、问题代码
2.1 main.xml
<? xml version="1.0" encoding="utf-8" ?> < LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android" android:orientation ="vertical" android:verticalSpacing ="0dp" android:padding ="0dp" android:layout_width ="fill_parent" android:layout_height ="fill_parent" > < LinearLayout android:layout_height ="333dp" android:id ="@+id/ContentView" android:background ="#FF0000" android:gravity ="fill" android:layout_width ="fill_parent" ></ LinearLayout > <!-- 底部菜单栏 --> < LinearLayout android:background ="#000928" android:layout_width ="wrap_content" android:layout_height ="wrap_content" androidrientation ="horizontal" android:gravity ="fill" > < ImageView android:src ="@drawable/main_info" android:layout_width ="wrap_content" android:layout_height ="wrap_content" /> < ImageView android:src ="@drawable/main_index" android:layout_width ="wrap_content" android:layout_height ="wrap_content" /> < ImageView android:src ="@drawable/main_own" android:layout_width ="wrap_content" android:layout_height ="wrap_content" /> < ImageView android:src ="@drawable/main_help" android:layout_width ="wrap_content" android:layout_height ="wrap_content" /> < ImageView android:src ="@drawable/main_set" android:layout_width ="wrap_content" android:layout_height ="wrap_content" /> < ImageView android:src ="@drawable/main_quit" android:layout_width ="wrap_content" android:layout_height ="wrap_content" /> < ImageView android:src ="@drawable/main_return" android:layout_width ="wrap_content" android:layout_height ="wrap_content" /> </ LinearLayout > </ LinearLayout > 2.2 grid.xml
<? xml version="1.0" encoding="utf-8" ?> < GridView xmlns:android ="http://schemas.android.com/apk/res/android" android:id ="@+id/gridview" android:layout_width ="fill_parent" android:layout_height ="fill_parent" android:numColumns ="5" android:verticalSpacing ="30dp" android:horizontalSpacing ="10dp" android:columnWidth ="90dp" android:stretchMode ="columnWidth" android:background ="#000928" android:scrollY = "-50dp" android:gravity ="center" /> 2.3 后台代码
private void ChangeView() { ly.removeAllViews(); LayoutInflater inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE); View layout = inflater.inflate(R.layout.grid, null ); GridView gridview = (GridView)layout.findViewById(R.id.gridview); gridview.setAdapter( new ItemAdapter(MainActivity. this )); gridview.setOnItemSelectedListener( new OnItemSelectedListener() { public void onItemSelected(AdapterView <?> arg0, View arg1, int arg2, long arg3) { } public void onNothingSelected(AdapterView <?> arg0) { } }); ly.addView(gridview); } 代码说明:
a). ly为main.xml中id为ContentView的LinearLayout,即需动态添加View的容器
b). ItemAdapter为Grid填充数据的辅助类
2.4 现象
2.4.1 正常
如果把grid.xml中GridView的代码直接复制粘贴到main.xml中LinearLayout容器内没有任何问题,布局正常。
2.4.2 不正常
如上动态添加android:layout_height="fill_parent"就失效,不管这里设置绝对数值如300dp也不行,GridView始终只显示有Item的内容,即容器内的View无法完全填充LinearLayout父容器。
三、 解决代码
就一行代码,不知道是Android的Bug还是怎么:
ly.addView(gridview, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT));
本文转自over140 51CTO博客,原文链接:http://blog.51cto.com/over140/582251,如需转载请自行联系原作者