Android获得已安装应用程序的列表

列出所有已安装的应用程序：

    ListView lView;        List<String> results = new  ArrayList<String>();        @Override        protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         lView = (ListView) findViewById(R.id.listView1);                 PackageManager pm = this.getPackageManager();         Intent intent = new Intent(Intent.ACTION_MAIN, null);         intent.addCategory(Intent.CATEGORY_LAUNCHER);                 List<ResolveInfo> list = pm.queryIntentActivities(intent, PackageManager.PERMISSION_GRANTED);                 for (ResolveInfo rInfo : list) {             results.add(rInfo.activityInfo.applicationInfo.loadLabel(pm).toString());         }                 lView.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, results));