自定义BaseAdapter，实现列表显示功能

1.新建list_item.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"
    >
    
    <ImageView 
        android:id="@+id/img01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
    <TextView  
        android:id="@+id/tv01"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"         
        />
</LinearLayout>

2.新建信息存储类（AppInfo）

public class AppInfo
{
    public String appName = null;　　//应用程序名
    public Drawable icon = null;　　//应用程序图片
}

3.新建MyAdapter类，继承BaseAdapter

public class MyAdapter extends BaseAdapter
{
    private Context context;
    private List<AppInfo> appList;

    public MyAdapter(Context context, List<AppInfo> appList)
    {
        this.context = context;
        this.appList = appList;
    }

    @Override
    public int getCount()
    {
        // TODO Auto-generated method stub
        return appList.size();
    }

    @Override
    public Object getItem(int position)
    {
        // TODO Auto-generated method stub
        return appList.get(position);
    }

    @Override
    public long getItemId(int position)
    {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        // TODO Auto-generated method stub
        View view = null;
        ViewHolder holder = null;

        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        if (convertView == null)
        {
            view = inflater.inflate(R.layout.list_item, null);
            holder = new ViewHolder(view);
            view.setTag(holder);
        } else
        {
            view = convertView;
            holder = (ViewHolder) convertView.getTag();
        }        
        AppInfo appInfo = (AppInfo)getItem(position);
        holder.tvInfo.setText(appInfo.appName);
        holder.imgInfo.setImageDrawable(appInfo.icon);
        return view;
    }

    class ViewHolder
    {
        TextView tvInfo;
        ImageView imgInfo;

        public ViewHolder(View view)
        {
            tvInfo = (TextView) view.findViewById(R.id.tv01);
            imgInfo = (ImageView) view.findViewById(R.id.img01);
        }
    }

}

4.修改main.xml文件

<?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/mylist"  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="@string/hello"
        />
</LinearLayout>

5.编写mainactivity代码

public class MainActivity extends Activity
{
    private ListView listView = null;
    private List<AppInfo> appList = new ArrayList<AppInfo>();
    private List<PackageInfo> manager = null;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        listView = (ListView) findViewById(R.id.mylist);

        manager = getPackageManager().getInstalledPackages(0);
        for (int i = 0; i < manager.size(); i++)
        {
            PackageInfo packageInfo = manager.get(i);
            //应用程序信息存储到appinfo里
            AppInfo appInfo = new AppInfo();
            appInfo.appName = packageInfo.applicationInfo.loadLabel(getPackageManager()).toString();
            appInfo.icon = packageInfo.applicationInfo.loadIcon(getPackageManager());
            appList.add(appInfo);
        }
        
        MyAdapter adapter = new MyAdapter(this, appList);
        listView.setAdapter(adapter);
    }
}

源码：https://files.cnblogs.com/kelei12399/BaseAdapterDemo.zip