activity_main.xml

item_app.xml

AppInfo

package com.example.app3_listview;import android.graphics.drawable.Drawable;public class AppInfo {	private Drawable icon;	private String appName;	private String packageName;	public AppInfo(Drawable icon, String appName, String packageName) {		super();		this.icon = icon;		this.appName = appName;		this.packageName = packageName;	}	public AppInfo() {		super();	}	public Drawable getIcon() {		return icon;	}	public void setIcon(Drawable icon) {		this.icon = icon;	}	public String getAppName() {		return appName;	}	public void setAppName(String appName) {		this.appName = appName;	}	public String getPackageName() {		return packageName;	}	public void setPackageName(String packageName) {		this.packageName = packageName;	}	@Override	public String toString() {		return "AppInfo [icon=" + icon + ", appName=" + appName				+ ", packageName=" + packageName + "]";	}}

MainActivity

package com.example.app3_listview;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.pm.PackageManager;import android.content.pm.ResolveInfo;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import android.widget.Toast;import com.example.adapter.base.CommonBaseAdapter;import com.example.adapter.base.ViewHolder;public class MainActivity extends Activity {	private ListView lv_main_apps;	private List
     
       data;	private MyAdapter adapter;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		// 载入视图--仅仅有一个listview		setContentView(R.layout.activity_main);		// 获取id		lv_main_apps = (ListView) findViewById(R.id.lv_main_apps);		// 得到数据		data = getAllAppInfos();		// 创建adapter		adapter = new MyAdapter(this, data, R.layout.item_app);		// 设置adapter显示		lv_main_apps.setAdapter(adapter);		// 设置每项(item)的点击监听		lv_main_apps				.setOnItemClickListener(new AdapterView.OnItemClickListener() {					@Override					public void onItemClick(AdapterView
       parent, View view,							int position, long id) {// position 点击的下标						// 得到数据						AppInfo appInfo = data.get(position);						String appName = appInfo.getAppName();						// 显示						Toast.makeText(MainActivity.this, appName, 0).show();					}				});	}	/*	 * 得到手机中全部应用信息的列表 AppInfo	 */	protected List
      
        getAllAppInfos() {		List
       
         list = new ArrayList
        
         ();		// 得到应用的packgeManager		PackageManager packageManager = getPackageManager();		// 创建一个主界面的intent		Intent intent = new Intent();		intent.setAction(Intent.ACTION_MAIN);		intent.addCategory(Intent.CATEGORY_LAUNCHER);		// 得到包括应用信息的列表		List
         
           ResolveInfos = packageManager.queryIntentActivities(				intent, 0);		// 遍历		for (ResolveInfo ri : ResolveInfos) {			// 得到包名			String packageName = ri.activityInfo.packageName;			// 得到图标			Drawable icon = ri.loadIcon(packageManager);			// 得到应用名称			String appName = ri.loadLabel(packageManager).toString();			// 封装应用信息对象			AppInfo appInfo = new AppInfo(icon, appName, packageName);			// 加入到list			list.add(appInfo);		}		return list;	}	/**	 * 继承自CommonBaseAdapter的adapter类	 */	class MyAdapter extends CommonBaseAdapter
          
            { public MyAdapter(Context context, final List
           
             data, int layoutId) { super(context, data, layoutId, new Convert() { @Override public void convert(ViewHolder holder, int position) { AppInfo appInfo = data.get(position); holder.setText(R.id.tv_item_name, appInfo.getAppName()).setImageDrawable(R.id.iv_item_icon,appInfo.getIcon()); } }); } }}
           
          
         
        
       
      
     

CommonBaseAdapter

package com.example.adapter.base;import java.util.List;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;/** * 通用的baseAdapter */public abstract class CommonBaseAdapter
     
       extends BaseAdapter {	private Context context;	private List
      
        data;	private int layoutId;	public Convert convert;		/**	 * 设置视图数据的抽象方法, 由详细的adapter子类来实现	 */	public interface Convert{		void convert(ViewHolder holder, int position);	}	public CommonBaseAdapter(Context context, List
       
         data, int layoutId,Convert convert) {		this.context = context;		this.data = data;		this.layoutId = layoutId;		this.convert = convert;	}	@Override	public int getCount() {		return data.size();	}	@Override	public T getItem(int position) {		return data.get(position);	}	@Override	public long getItemId(int position) {		return 0;	}	@Override	public View getView(int position, View convertView, ViewGroup parent) {		//得到Viewholder对象		ViewHolder holder = ViewHolder.getHolder(context, convertView,				layoutId);		//调用未实现的抽象方法设置数据		convert.convert(holder, position);		//返回holder中的convertView		return holder.getConvertView();	}}
       
      
     

ViewHolder

package com.example.adapter.base;import android.content.Context;import android.graphics.drawable.Drawable;import android.util.SparseArray;import android.view.View;import android.widget.ImageView;import android.widget.TextView;/** * 通用的ViewHolder类 */public class ViewHolder {	// 代表当前行的view对象	private View itemConvertView;	// 用来替代Map
     
      的容器, 效率比map高	private SparseArray
      
        views;	/*******************************************************************	 * 得到ViewHolder对象 context--layoutId：这个是用来构造时候，须要动态载入布局文件	 * convertview:是可复用的item布局	 */	public static ViewHolder getHolder(Context context, View convertView,			int layoutId) {		/**		 * 假设没有可复用的布局。就创建本类对象 假设有的话，就通过getTag获取		 * */		if (convertView == null) {			return new ViewHolder(context, layoutId);		} else {			ViewHolder holder = (ViewHolder) convertView.getTag();			return holder;		}	}	/**	 * 构造方法 载入布局文件。将本类标记即viewholder保存到itemConvertView中	 */	private ViewHolder(Context context, int layoutId) {		this.itemConvertView = View.inflate(context, layoutId, null);		this.itemConvertView.setTag(this);		views = new SparseArray
       
        ();	}	/**	 * 得到当前相应的convertView	 */	public View getConvertView() {		return itemConvertView;	}	/*************************	 * %%%%%%%%%%%%******************************** 依据视图id得到相应的视图对象	 */	public 
        
          T getView(int viewId) {		View view = views.get(viewId);		if (view == null) {			view = itemConvertView.findViewById(viewId);			views.put(viewId, view);		}		return (T) view;	}	//	/**	 * 设置文本数据	 */	public ViewHolder setText(int viewId, String text) {		TextView textView = getView(viewId);		textView.setText(text);		return this;	}	/**	 * 设置drawable图片	 */	public ViewHolder setImageDrawable(int viewId, Drawable drawable) {		ImageView imageView = getView(viewId);		imageView.setImageDrawable(drawable);		return this;	}	/**	 * 设置资源图片	 */	public ViewHolder setImageResource(int viewId, int resourceId) {		ImageView imageView = getView(viewId);		imageView.setImageResource(resourceId);		return this;	}}