获取android系统上的所有程序信息

下面的示例可以获取手机上所有的应用程序信息，代码如下：MainActivity：

import java.util.ArrayList;    import java.util.HashMap;    import java.util.List;    import java.util.Map;        import android.app.Activity;    import android.content.pm.PackageInfo;    import android.graphics.drawable.Drawable;    import android.os.Bundle;    import android.util.Log;    import android.widget.ListView;    import android.widget.SimpleAdapter;        public class MainActivity extends Activity {            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");            }        }            /**        * 列出所有的APP信息        */        private void listPackages() {            ArrayList<PInfo> apps = getInstalledApps(false);            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);            }        }            /**        * 获取系统所有已安装的APP信息        *         * @param getSysPackages        * @return        */        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;        }        }