public class AppListView extends LinearLayout implements OnItemClickListener{
  private final static String TAG = "AppListView";
  private ListView mListView;
  private TextView mTvTitle;
  private List<AppInfo> mAppList;
  private Context mContext;
  private LayoutInflater mInflater;
  private PackageManager mPacManager;
  public AppListView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init(context);
  }
  public AppListView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init(context);
  }
  public AppListView(Context context)
  {
    super(context);
    init(context);
  }
  private void init(Context c)
  {
    mContext = c;
    mInflater = (LayoutInflater)c.getSystemService
         (Context.LAYOUT_INFLATER_SERVICE);
    this.addView(mInflater.inflate(R.layout.activity_main,null,false));
    mListView = (ListView)this.findViewById(R.id.listView);
    mTvTitle  = (TextView)this.findViewById(R.id.title);
    loadAppData();
    mListView.setAdapter(new MyAdapter(c));
    mListView.setOnItemClickListener(this);
    Log.d(TAG, "一共"+mAppList.size());
  }
  // 加载应用软件数据 软件名称，包名，对应的图标等等
  private void loadAppData()
  {
    if(mAppList != null){
      mAppList.clear();
    }else{
      mAppList = new ArrayList<AppInfo>();
    }
    mPacManager = mContext.getPackageManager();
    List<PackageInfo> packages = mPacManager.getInstalledPackages(0);
    for(int i=0; i<packages.size(); i++){
      PackageInfo pi = packages.get(i);
      AppInfo ai = new AppInfo();
      ai.packageName = pi.packageName;
      ai.appName = pi.applicationInfo.loadLabel(mPacManager).toString();
      ai.appIcon = pi.applicationInfo.loadIcon(mPacManager);
      mAppList.add(ai);
    }
    mTvTitle.setText("本机所安装的软件总数："+packages.size()+"个");
  }
  // 为ListView自定义适配器
  class MyAdapter extends BaseAdapter
  {
    public MyAdapter(Context c)
    {
      mContext = c;
    }
    @Override
    public int getCount() {
      return mAppList == null?0:mAppList.size();
    }
    @Override
    public Object getItem(int arg0) {
      return mAppList == null?null:mAppList.get(arg0);
    }
    @Override
    public long getItemId(int arg0) {
      return arg0;
    }
    @Override
    public View getView(int arg0, View arg1, ViewGroup arg2) {
      View view;
      if(arg1 == null){
        view = mInflater.inflate(R.layout.app_list_item, null);
      }else{
        view = arg1;
      }
      AppInfo ai = (AppInfo)getItem(arg0);
      ImageView appIcon  = (ImageView)view.findViewById(R.id.appIcon);
      TextView appName  = (TextView)view.findViewById(R.id.appName);
      TextView appPackage = (TextView)view.findViewById(R.id.appPackage);
      appIcon.setImageDrawable(ai.appIcon);
      appName.setText(ai.appName);
      appPackage.setText(ai.packageName);
      return view;
    }
  }
  // 处理ListView的item的点击操作，我这里是启动该应用程序
  @Override
  public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    Toast.makeText(mContext, arg2+"", Toast.LENGTH_SHORT).show();
    // 获取本次item的包名
    String packName = mAppList.get(arg2).packageName;
    // 启动此程序
    Intent intent = mPacManager.getLaunchIntentForPackage(packName);
    mContext.startActivity(intent);
  }
  // 软件载体
  public class AppInfo {
    // 软件名称
    public String appName="";
    // 软件包名
    public String packageName="";
    // 软件图标
    public Drawable appIcon=null;
  }
}