取得android系统设备中安装的程式名以及package

public class TestGetAppInfoActivity extends Activity {
    /** Called when the activity is first created. */
    private List<Map<String, Object>> data;
    Map<String, Object> item;
    private ListView listView = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        listView = new ListView(this);
        data = new ArrayList<Map<String, Object>>();
        listPackages();
        SimpleAdapter adapter = new SimpleAdapter(this, data,
                android.R.layout.simple_list_item_2, new String[] { "appname",
                        "pname" }, new int[] { android.R.id.text1,
                        android.R.id.text2, });
        listView.setAdapter(adapter);
        setContentView(listView);
    }

    class PInfo {
        private String appname = "";
        private String pname = "";
        private String versionName = "";
        private int versionCode = 0;
        private Drawable icon;

        private void prettyPrint() {
            Log.i("taskmanger", appname + "\t" + pname + "\t" + versionName
                    + "\t" + versionCode + "\t");
        }
    }

    private void listPackages() {
        ArrayList<PInfo> apps = getInstalledApps(false); /*
                                                          * false = no system
                                                          * packages
                                                          */
        final int max = apps.size();
        for (int i = 0; i < max; i++) {
            apps.get(i).prettyPrint();
            item = new HashMap<String, Object>();
            item.put("appname", apps.get(i).appname);
            item.put("pname", apps.get(i).pname);
            data.add(item);
        }
    }

    private ArrayList<PInfo> getInstalledApps(boolean getSysPackages) {
        ArrayList<PInfo> res = new ArrayList<PInfo>();
        List<PackageInfo> packs = getPackageManager().getInstalledPackages(0);
        for (int i = 0; i < packs.size(); i++) {
            PackageInfo p = packs.get(i);
            if ((!getSysPackages) && (p.versionName == null)) {
                continue;
            }
            PInfo newInfo = new PInfo();
            newInfo.appname = p.applicationInfo.loadLabel(getPackageManager())
                    .toString();
            newInfo.pname = p.packageName;
            newInfo.versionName = p.versionName;
            newInfo.versionCode = p.versionCode;
            newInfo.icon = p.applicationInfo.loadIcon(getPackageManager());
            res.add(newInfo);
        }
        return res;
    }
}