android ListView详解
动态刷新ListView数据: http://panyongzheng.iteye.com/admin/blogs/1453777
带有文字说明的 http://chengbs.iteye.com/blog/910812
列表的适配器类型，列表分为三种，ArrayAdapter，SimpleAdapter和SimpleCursorAdapter
1.ArrayAdapter最为简单，只能展示一行字。
2.SimpleCursorAdapter 构造函数前面3个参数和ArrayAdapter是一样的，最后两个参数：一个包含数据库的列的String型数组，一个包含布局文件中对应组件id的int型数组。其作用是自动的将String型数组所表示的每一列数据映射到布局文件对应id的组件上。上面的代码，将NAME列的数据一次映射到布局文件的id为text1的组件上。
3.simpleAdapter的扩展性最好，可以定义各种各样的布局出来，可以放上ImageView（图片），还可以放上Button（按钮），CheckBox（复选框）等等。使用simpleAdapter的数据用一般都是HashMap构成的List，list的每一节对应ListView的每一行。HashMap的每个键值数据映射到布局文件中对应id的组件上。因为系统没有对应的布局文件可用，我们可以自己定义一个布局vlist.xml。下面做适配，new一个SimpleAdapter参数一次是：this，布局文件（vlist.xml），HashMap的 title 和 info，img。布局文件的组件id，title，info，img。布局文件的各组件分别映射到HashMap的各元素上，完成适配。
AndroidManifest.xml
--------------------------------
main.xml
vlist.xml
vlist2.xml
Main.java
MyListView.java
MyListView2.java
MyListView3.java
MyListView4.java
带有文字说明的 http://chengbs.iteye.com/blog/910812
列表的适配器类型，列表分为三种，ArrayAdapter，SimpleAdapter和SimpleCursorAdapter
1.ArrayAdapter最为简单，只能展示一行字。
2.SimpleCursorAdapter 构造函数前面3个参数和ArrayAdapter是一样的，最后两个参数：一个包含数据库的列的String型数组，一个包含布局文件中对应组件id的int型数组。其作用是自动的将String型数组所表示的每一列数据映射到布局文件对应id的组件上。上面的代码，将NAME列的数据一次映射到布局文件的id为text1的组件上。
3.simpleAdapter的扩展性最好，可以定义各种各样的布局出来，可以放上ImageView（图片），还可以放上Button（按钮），CheckBox（复选框）等等。使用simpleAdapter的数据用一般都是HashMap构成的List，list的每一节对应ListView的每一行。HashMap的每个键值数据映射到布局文件中对应id的组件上。因为系统没有对应的布局文件可用，我们可以自己定义一个布局vlist.xml。下面做适配，new一个SimpleAdapter参数一次是：this，布局文件（vlist.xml），HashMap的 title 和 info，img。布局文件的组件id，title，info，img。布局文件的各组件分别映射到HashMap的各元素上，完成适配。
AndroidManifest.xml
--------------------------------
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.lee.android"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Main"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MyListView"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.mylistview" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity android:name=".MyListView2"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.mylistview2" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity android:name=".MyListView3"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.mylistview3" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity android:name=".MyListView4"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.mylistview4" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.READ_CONTACTS"></uses-permission>
</manifest>
main.xml
<?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"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
android:id="@+id/mylistview_btn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/s_mylistview_btn"
/>
<Button
android:id="@+id/simpleCursorAdapter_btn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/s_simpleCursorAdapter_btn"
/>
<Button
android:id="@+id/simpleAdapter_btn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/s_simpleAdapter_btn"
/>
<Button
android:id="@+id/myAdapter_btn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/s_myAdapter_btn"
/>
</LinearLayout>
vlist.xml
<?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"> <ImageView android:id="@+id/img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="5px"/> <LinearLayout android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="wrap_content"> <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#FFFFFFFF" android:textSize="22px" /> <TextView android:id="@+id/info" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#FFFFFFFF" android:textSize="13px" /> </LinearLayout> </LinearLayout>
vlist2.xml
<?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"> <ImageView android:id="@+id/img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="5px"/> <LinearLayout android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="wrap_content"> <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#FFFFFFFF" android:textSize="22px" /> <TextView android:id="@+id/info" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#FFFFFFFF" android:textSize="13px" /> </LinearLayout> <Button android:id="@+id/view_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/s_view_btn" android:layout_gravity="bottom|right" /> </LinearLayout>
Main.java
/**
* @author allin.dev
* http://allin.cnblogs.com/
*/
package org.lee.android;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class Main extends Activity {
private Button myListViewBtn;
private Button mysimpleCursorAdapterBtn;
private Button simpleAdapterBtn;
private Button myAdapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findViews();
setLIsteners();
}
private void findViews() {
myListViewBtn = (Button) findViewById(R.id.mylistview_btn);
mysimpleCursorAdapterBtn = (Button) findViewById(R.id.simpleCursorAdapter_btn);
simpleAdapterBtn = (Button) findViewById(R.id.simpleAdapter_btn);
myAdapter = (Button) findViewById(R.id.myAdapter_btn);
}
private void setLIsteners() {
myListViewBtn.setOnClickListener(myListViewBtnListener);
mysimpleCursorAdapterBtn.setOnClickListener(simpleCursorAdapterBtnListener);
simpleAdapterBtn.setOnClickListener(simpleAdapterBtnListener);
myAdapter.setOnClickListener(myAdapterBtnListener);
}
private View.OnClickListener myAdapterBtnListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.v("MyListView4", "myAdapter");
Intent intent = new Intent(Main.this, MyListView4.class);
startActivity(intent);
}
};
private View.OnClickListener simpleAdapterBtnListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.v("MyListView3", "simpleAdapter");
Intent intent = new Intent(Main.this, MyListView3.class);
startActivity(intent);
}
};
private View.OnClickListener simpleCursorAdapterBtnListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.v("MyListView2", "simpleCursorAdapter");
Intent intent = new Intent(Main.this, MyListView2.class);
startActivity(intent);
}
};
private View.OnClickListener myListViewBtnListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.v("MyListView", "myListViewBtnListener");
// Intent intent = new Intent("android.intent.action.mylistview");
Intent intent = new Intent(Main.this, MyListView.class);
startActivity(intent);
}
};
}
MyListView.java
/**
*
*/
package org.lee.android;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
/**
* @author allin
*
*/
public class MyListView extends Activity {
private ListView listView;
//private List<String> data = new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
listView = new ListView(this);
listView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1,getData()));
setContentView(listView);
}
private List<String> getData(){
List<String> data = new ArrayList<String>();
data.add("测试数据1");
data.add("测试数据2");
data.add("测试数据3");
data.add("测试数据4");
return data;
}
}
MyListView2.java
/**
*
*/
package org.lee.android;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.Contacts.People;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
/**
* @author allin
*
*/
public class MyListView2 extends Activity {
private ListView listView;
//private List<String> data = new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
listView = new ListView(this);
Cursor cursor = getContentResolver().query(People.CONTENT_URI, null, null, null, null);
startManagingCursor(cursor);
ListAdapter listAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_expandable_list_item_1,
cursor,
new String[]{People.NAME},
new int[]{android.R.id.text1});
listView.setAdapter(listAdapter);
setContentView(listView);
}
}
MyListView3.java
/**
*
*/
package org.lee.android;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.SimpleAdapter;
/**
* @author allin
*
*/
public class MyListView3 extends ListActivity {
// private List<String> data = new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SimpleAdapter adapter = new SimpleAdapter(this,getData(),R.layout.vlist,
new String[]{"title","info","img"},
new int[]{R.id.title,R.id.info,R.id.img});
setListAdapter(adapter);
}
private List<Map<String, Object>> getData() {
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
Map<String, Object> map = new HashMap<String, Object>();
map.put("title", "G1");
map.put("info", "google 1");
map.put("img", R.drawable.i1);
list.add(map);
map = new HashMap<String, Object>();
map.put("title", "G2");
map.put("info", "google 2");
map.put("img", R.drawable.i2);
list.add(map);
map = new HashMap<String, Object>();
map.put("title", "G3");
map.put("info", "google 3");
map.put("img", R.drawable.i3);
list.add(map);
return list;
}
}
MyListView4.java
/**
*
*/
package org.lee.android;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
/**
* @author allin
*
*/
public class MyListView4 extends ListActivity {
private List<Map<String, Object>> mData;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mData = getData();
MyAdapter adapter = new MyAdapter(this);
setListAdapter(adapter);
}
private List<Map<String, Object>> getData() {
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
Map<String, Object> map = new HashMap<String, Object>();
map.put("title", "G1");
map.put("info", "google 1");
map.put("img", R.drawable.i1);
list.add(map);
map = new HashMap<String, Object>();
map.put("title", "G2");
map.put("info", "google 2");
map.put("img", R.drawable.i2);
list.add(map);
map = new HashMap<String, Object>();
map.put("title", "G3");
map.put("info", "google 3");
map.put("img", R.drawable.i3);
list.add(map);
return list;
}
// ListView 中某项被选中后的逻辑
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
Log.v("MyListView4-click", (String)mData.get(position).get("title"));
}
/**
* listview中点击按键弹出对话框
*/
public void showInfo(){
new AlertDialog.Builder(this)
.setTitle("我的listview")
.setMessage("介绍...")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.show();
}
public final class ViewHolder{
public ImageView img;
public TextView title;
public TextView info;
public Button viewBtn;
}
public class MyAdapter extends BaseAdapter{
private LayoutInflater mInflater;
public MyAdapter(Context context){
this.mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mData.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder=new ViewHolder();
convertView = mInflater.inflate(R.layout.vlist2, null);
holder.img = (ImageView)convertView.findViewById(R.id.img);
holder.title = (TextView)convertView.findViewById(R.id.title);
holder.info = (TextView)convertView.findViewById(R.id.info);
holder.viewBtn = (Button)convertView.findViewById(R.id.view_btn);
convertView.setTag(holder);
}else {
holder = (ViewHolder)convertView.getTag();
}
holder.img.setBackgroundResource((Integer)mData.get(position).get("img"));
holder.title.setText((String)mData.get(position).get("title"));
holder.info.setText((String)mData.get(position).get("info"));
holder.viewBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showInfo();
}
});
return convertView;
}
}
}