[Android1.6]动态添加View的问题
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 >
< 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"
/>
< 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);
}
{
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
