List all app information in the system

List all the app programs in the system, such as. Not much to say, directly on the code, very simple a small program.

Layout file Code:

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" match_parent "    android:layout_height=" Match_parent " >         <gridview         android:id= "@+id/apps_list"        android:layout_width= "Wrap_content"        android: layout_height= "Wrap_content"        android:numcolumns= "4"          >      </GridView>  </ Relativelayout>

Mainactivity Code:

/** * Lists all apps in the system. * @author Lu Guoqiang. * */public class Mainactivity extends Actionbaractivity {//system all app information private list<resolveinfo> apps;//with nine Gongge view rendered    Now all appprivate GridView apps_list;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        Apps_list = (GridView) Findviewbyid (r.id.apps_list);    Loadapps ();          } private void Loadapps () {//Get system all app info Intent mainintent = new Intent (intent.action_main, NULL);          Mainintent.addcategory (Intent.category_launcher);        New ImageView (Mainactivity.this);        Apps = Getpackagemanager (). Queryintentactivities (mainintent, 0);    Set the information to the adapter Apps_list.setadapter (new Appsadapter ()); } public class Appsadapter extends Baseadapter {public appsadapter () {} @Overrid          e public int GetCount () {return apps.size ();       }     @Override public Object getItem (int i) {return apps.get (i);          } @Override public long getitemid (int i) {return i;            } @Override public View getView (int i, view view, ViewGroup ViewGroup) {ImageView IV;                  if (view = = null) {IV = new ImageView (mainactivity.this);                  Iv.setscaletype (ImageView.ScaleType.FIT_CENTER);              Iv.setlayoutparams (New Gridview.layoutparams (50, 50));              } else {IV = (ImageView) view;              } ResolveInfo info = Apps.get (i);              Iv.setimagedrawable (Info.activityInfo.loadIcon (Getpackagemanager ()));          return IV; }      }  }

The configuration manifest file does not need to be modified.

List all app information in the system