ListView添加事件並獲取選中項的值
博客分類: Android爲什麼ListView.setOnItemClickListener、setOnCreateContextMenuListener會無效:
http://blog.csdn.net/mahaiyun18/article/details/6531371
如果ListView中的單個Item的view中存在checkbox,button等view,會導致ListView.setOnItemClickListener無效,
事件會被子View捕獲到,ListView無法捕獲處理該事件.
解決方法:
在checkbox、button對應的view處加android:focusable="false"
android:clickable="false" android:focusableInTouchMode="false"
其中focusable是關鍵
Android ListView/ListActivity點擊長按事件:
http://blog.163.com/zmhot88@126/blog/static/16984664720107319215488/
ListActivity和ListView是很常用的組件,用來製作列表形式的用戶界面。本文介紹如何正確處理ListView中的條目短按和長 按事件,他們的處理方式是不同的。
對於短按事件,處理起來比較簡單,我們只需要覆蓋ListActivity的onListItemClick()方法,如下所示:
@Override
protected void onListItemClick(ListView arg0, View arg1, int arg2, long arg3) {
CharSequence s = ((TextView)arg1).getText();
Log.e("CallLogActivity",s+ " is clicked");
super.onListItemClick(arg0, arg1, arg2, arg3);
}
對於長按事件,我們需要給listview註冊一個OnItemLongClickListener,並實現Listener中定義的方法,如 下所示:
- getListView().setOnItemLongClickListener(new OnItemLongCLickListener(){
- public boolean onItemLongClick(AdapterView parent, View view, int position,
- long id) {
- Log.e("CallLogActivity", view.toString() + "position=" + position);
- CharSequence number = ((TextView) view).getText();
- Toast t = Toast.makeText(this, number + " is long clicked",
- Toast.LENGTH_LONG);
- t.show();
- return true;
- }
- });
下面是例子代碼。不包含上述技術
--------------------------------------------
main.xml代碼如下:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <ListView
- android:id="@+id/myListView"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- />
- </LinearLayout>
list_item.xml代碼如下:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="horizontal"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:id="@+id/itemTitle"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textSize="22dip"
- android:paddingRight="12dip"
- />
- <TextView
- android:id="@+id/itemContent"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textSize="22dip"
- />
- </LinearLayout>
activity MyListView.java代碼如下:
- package listview.pack;
- import java.util.ArrayList;
- import java.util.HashMap;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.View;
- import android.widget.AdapterView;
- import android.widget.AdapterView.OnItemClickListener;
- import android.widget.ListView;
- import android.widget.SimpleAdapter;
- import android.widget.Toast;
- public class MyListView extends Activity {
- /** Called when the activity is first created. */
- //聲明ListView對象
- ListView myListView;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- //生成ListView對象
- myListView=(ListView)findViewById(R.id.myListView);
- //創建ArrayList對象 並添加數據
- ArrayList<HashMap<String,String>> myArrayList=new ArrayList<HashMap<String,String>>();
- for(int i=0;i<10;i++){
- HashMap<String, String> map = new HashMap<String, String>();
- map.put("itemTitle", "This Is Title "+i);
- map.put("itemContent", "This Is Content "+i);
- myArrayList.add(map);
- }
- //生成SimpleAdapter適配器對象
- SimpleAdapter mySimpleAdapter=new SimpleAdapter(this,
- myArrayList,//數據源
- R.layout.list_items,//ListView內部數據展示形式的佈局文件listitem.xml
- new String[]{"itemTitle","itemContent"},//HashMap中的兩個key值 itemTitle和itemContent
- new int[]{R.id.itemTitle,R.id.itemContent});/*佈局文件listitem.xml中組件的id
- 佈局文件的各組件分別映射到HashMap的各元素上,完成適配*/
- myListView.setAdapter(mySimpleAdapter);
- //添加點擊事件
- myListView.setOnItemClickListener(new OnItemClickListener(){
- @Override
- public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
- long arg3) {
- //獲得選中項的HashMap對象
- HashMap<String,String> map=(HashMap<String,String>)myListView.getItemAtPosition(arg2);
- String title=map.get("itemTitle");
- String content=map.get("itemContent");
- Toast.makeText(getApplicationContext(),
- "你選擇了第"+arg2+"個Item,itemTitle的值是:"+title+"itemContent的值是:"+content,
- Toast.LENGTH_SHORT).show();
- }
- });
- }
- }