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我在 android 中使用 Master Detail Flow 模板。我想在应用程序启动时以编程方式访问列表中的项目，以便设置那里的 TextViews 的字体大小和颜色。如果我在 onResume（ItemListActivity 或 ItemListFragment）中编码，ListView 不为空，但 3 个 TextView（ListView 的子项）为空。

public void updateActivity( )
{
 ViewGroup leftPane = ( ViewGroup ) findViewById( R.id.item_list );
 FrameLayout frameLayout = ( FrameLayout ) leftPane.getChildAt( 0 );
 FrameLayout frameLayout2 = ( FrameLayout ) frameLayout.getChildAt( 1 );
 ListView listView = ( ListView ) frameLayout2.getChildAt( 1 );  // listView NOT null
 TextView item0 = ( TextView ) listView.getChildAt( 0 ); // item0 is NULL !!!!!
}

我在 ItemListActivity 中提出了这段代码作为（脏）修复，我不确定它是否会一直工作并且与设备无关：

public View onCreateView( String name, Context context, AttributeSet attrs ) 
{
 // started is an int instance variable, initialized at 0
 Log.w( "MA", "Inside Activity:onCreateView, started =  " + started ); 
 // if started <= 40 ==> item0 is NULL inside updateActivity 
 if( started == 41) // ==> item0 NOT null inside updateActivity 
   updateActivity( );
 started++;
 return super.onCreateView( name, context, attrs );
}

那行得通，但我正在寻找（很多）更好的解决方案；这是 LogCat 中的输出（它确实在 48 处停止）：

所涉及的各种生命周期方法似乎有一些交错执行。必须有一种方法在方法内部进行编码，以保证在该方法执行之前已实例化所有视图；我试图从 Activity、FragmentActivity、ListFragment 和 Fragment 类中重写很多方法；到目前为止没有运气，TextViews（ListView 的子项）在所有这些方法中都是 NULL。顺便说一句，当启动等于 41 时，其他 TextViews 仍然为 NULL，当启动等于 43 时，第二个变为 NOT null，当启动等于 45 时，第三个变为 NOT null。知道吗？感谢您的任何帮助。

......
05-16 19:27:36.460: W/MA(3155): Inside Activity:onCreateView, started =  37
05-16 19:27:36.460: W/MA(3155): Inside Activity:onCreateView, started =  38
05-16 19:27:36.460: W/MA(3155): Inside ItemListActivity:onResume
05-16 19:27:36.460: W/MA(3155): Inside ItemListFragment:onResume
05-16 19:27:36.484: W/MA(3155): Inside Activity:onCreateView, started =  39
05-16 19:27:36.484: W/MA(3155): Inside Activity:onCreateView, started =  40
05-16 19:27:36.632: W/MA(3155): Inside Activity:onCreateView, started =  41
05-16 19:27:36.632: W/MA(3155): Inside checkActivity
05-16 19:27:36.632: W/MA(3155): Inside Activity:onCreateView, started =  42
05-16 19:27:36.640: W/MA(3155): Inside Activity:onCreateView, started =  43
05-16 19:27:36.640: W/MA(3155): Inside Activity:onCreateView, started =  44
05-16 19:27:36.648: W/MA(3155): Inside Activity:onCreateView, started =  45
05-16 19:27:36.656: W/MA(3155): Inside Activity:onCreateView, started =  46
05-16 19:27:36.742: W/MA(3155): Inside Activity:onCreateView, started =  47
05-16 19:27:36.742: W/MA(3155): Inside Activity:onCreateView, started =  48
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1 回答 1

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为此，您必须实现自定义适配器。从您的onCreate活动创建一个对象CustomAdapter并传入list of data.constructor

在里面CustomAdapter你必须覆盖getView()每一行的膨胀布局（在这里你）你必须调用）并基于你的findViewById(id)数据和。textView()setFont()setColor()textView

于 2013-05-17T20:17:21.383 回答