Android 程式开发:(十二)列表控件 —— 12.3 ListView的总结范例
使用一个例子,来总结一下ListView的基本使用。
1、新建一个工程:ListViewDemo。
2、main.xml中的代码。
[html]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button android:id="@+id/btn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Show selected items"
android:onClick="onClick"/>
<ListView
android:id="@+id/android:list"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
3、Strings.xml中的代码。
[html]
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, BasicViews5Activity!</string>
<string name="app_name">BasicViews5</string>
<string-array name="presidents_array">
<item>Dwight D. Eisenhower</item>
<item>John F. Kennedy</item>
<item>Lyndon B. Johnson</item>
<item>Richard Nixon</item>
<item>Gerald Ford</item>
<item>Jimmy Carter</item>
<item>Ronald Reagan</item>
<item>George H. W. Bush</item>
<item>Bill Clinton</item>
<item>George W. Bush</item>
<item>Barack Obama</item>
</string-array>
</resources>
4、ListViewDemo中的代码。
[java]
public class ListViewDemo extends ListActivity {
String[] presidents;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView lstView = getListView();
//lstView.setChoiceMode(ListView.CHOICE_MODE_NONE);
//lstView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
lstView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
lstView.setTextFilterEnabled(true);
presidents =
getResources().getStringArray(R.array.presidents_array);
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.易做图_list_item_checked, presidents));
}
public void onListItemClick(
ListView parent, View v, int position, long id)
{
Toast.makeText(this,
"You have selected " + presidents[position],
Toast.LENGTH_SHORT).show();
}
// for button click event
public void onClick(View view) {
ListView lstView = getListView();
String itemsSelected = "Selected items: \n";
for (int i=0; i<lstView.getCount(); i++) {
if (lstView.isItemChecked(i)) {
itemsSelected += lstView.getItemAtPosition(i) + "\n";
}
}
Toast.makeText(this, itemsSelected, Toast.LENGTH_LONG).show();
}
}
5、按F11在模拟器上面调试。在ListView中选择一些物件,然后点击上面的Button,就会显示出哪些物件被选择了。
ListView的功能远不止如此,比如设置ListView的动画,自动义ListView的显示和滑动模式,等等等。请大家在工作和学习中自己发掘吧~~~
补充:移动开发 , Android ,