添加ExpandableListView和其他元素的标签 [英] Add ExpandableListView to a tab with other elements

问题描述

我发展与标签的应用程序。在其中一个选项卡， 我有两个的EditText字段和几个按钮。我想补充一个ExpandableListView 到标签上，下方的元件的其余部分。

I am developing an app with tabs. On one of the tabs, I have two EditText fields and a couple of buttons. I want to add an ExpandableListView to the tab, below the rest of the elements.

我的问题是，当前类扩展了活动。所有我发现的例子延伸ExpandableListActivity，但我不能为同一类扩展两者。

My problem is that the current class extends Activity. All the example I've found extend ExpandableListActivity, but I can't extend both for the same class.

我如何添加此列表的标签？我已经在XML文件中添加了一个ExpandableListView元素，但每当我运行它，它不会显示出来。我知道我需要绑定的视图的一些数据，但我怎么去这样做？ 谢谢你。

How can I add this list to the tab? I've added an ExpandableListView element in the XML file, but whenever I run it, it doesn't show up. I understand that I need to bind the view to some data, but how do I go about doing this? Thank you.

下面是我的课code：

Here is my class code:

公共类DirectionsTab扩展活动 {  私人按钮clear_btn;  私人按钮go_btn;  私人的EditText origin_txt;  私人的EditText dest_txt;

public class DirectionsTab extends Activity { private Button clear_btn; private Button go_btn; private EditText origin_txt; private EditText dest_txt;

公共无效的onCreate（包savedInstanceState）     {         super.onCreate（savedInstanceState）;         的setContentView（R.layout.directions_tab）;

public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.directions_tab);

    // initialize views and onClick event handler
    origin_txt = (EditText)findViewById(R.id.origin_txt);
    dest_txt = (EditText)findViewById(R.id.dest_txt);
    clear_btn = (Button)findViewById(R.id.clear_btn);
    // clear all text fields and return focus to dest_txt
    clear_btn.setOnClickListener(new OnClickListener()
     { 
@Override
public void onClick(View v)
{
 origin_txt.setText("");
 dest_txt.setText(""); 
 origin_txt.requestFocus(); 
}    
     });        
} // end public void onCreate(Bundle savedInstanceState)

} //结束公共类DirectionsTab扩展活动

} // end public class DirectionsTab extends Activity

和XML：

           

<TextView
    android:id="@+id/dest_lbl"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@id/origin_txt"
    android:text="Destination"
/>
<EditText
    android:id="@+id/dest_txt"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@android:drawable/editbox_background"
    android:layout_below="@id/dest_lbl"
/>    

<ExpandableListView
 android:id="@+id/listView"      
 android:layout_below="@+id/dest_txt" 
 android:layout_height="wrap_content"
 android:layout_width="wrap_content" 

/>

        机器人：layout_width =WRAP_CONTENT         机器人：layout_height =WRAP_CONTENT         机器人：layout_below =@ ID / dest_txt         机器人：layout_alignParentRight =真         机器人：layout_marginLeft =10dip
        机器人：layout_marginTop =10dip         机器人：文本=清除     />              机器人：layout_toLeftOf =@ ID / clear_btn         机器人：layout_alignTop =@ ID / clear_btn         机器人：文本=去！     />

android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/dest_txt" android:layout_alignParentRight="true" android:layout_marginLeft="10dip"
android:layout_marginTop="10dip" android:text="Clear" /> android:layout_toLeftOf="@id/clear_btn" android:layout_alignTop="@id/clear_btn" android:text="Go!" />

推荐答案

我得到这个！如果任何人有问题，这一点，一定要遵循以下步骤：

I got this! If anyone's having problems with this, make sure you follow these steps:

1. 复制并粘贴<一href="http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/ExpandableList3.html"相对=nofollow> ExpandableList3 例子（位于ApiDemos项目从Samples文件夹在你的Andr​​oid SDK）。这是如何建立一个列表，只是一个很好的例子。
2. 请你的类继承自ExpandableListActivity

3. 建立在XML布局文件如下：

1. Copy and paste ExpandableList3 example (located in ApiDemos project from Samples folder in your Android SDK). This is just a good example of how to set up a list.
2. Make your class inherit from ExpandableListActivity

3. Create the following in your XML layout file:

<ExpandableListView
android:id="@android:id/list"       
android:layout_below="@+id/go_btn" 
android:layout_width="match_parent" 
android:layout_height="match_parent"
android:layout_weight="1"        

/>

这是非常重要的，你看到的上面，否则任何方法都行不通的ID属性相匹配。这个小细节浪费了大量的时间对我来说，发现整齐的座位作为一个小细节在Android文档。

It is VERY important that the ID property matches what you see above, otherwise nothing will work. This little detail wasted plenty of hours for me, and was discovered seating neatly as a small detail in the Android docs.

这篇关于添加ExpandableListView和其他元素的标签的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！