Android--Queryintentactivities

At some point you want to know if an app has a specific intent, say you want to check if a receiver exists, and then enable certain functions on your AP based on the presence of the receiver. We can check it by Packagemanager.

Code

 Public Booleanisintentavailable (Context context, String action) {FinalPackagemanager Packagemanager =Context.getpackagemanager (); FinalIntent Intent =NewIntent (action); List<ResolveInfo> ResolveInfo =packagemanager.queryintentactivities (Intent, packagemanager.match_default_only); if(Resolveinfo.size () > 0) {          return true; }     return false; }

Dry

In the general app manifest, the activity to be set to launcher is always set Intent-filter:

< Intent-filter >                  <  android:name= "Android.intent.action.MAIN"/>                  <   android:name= "Android.intent.category.LAUNCHER"/>  </  intent-filter>

There are launcher that can be obtained through Queryintentactivities:

Private void Loadapps () {                   newnull);                   Mainintent.addcategory (intent.category_launcher);                      = Getpackagemanager (). Queryintentactivities (mainintent, 0);           }

We can use a GridView on our app to show you what apps are currently on your phone:

Importjava.util.List; Importandroid.app.Activity; Importandroid.content.Intent; ImportAndroid.content.pm.ResolveInfo; ImportAndroid.os.Bundle; ImportAndroid.view.View; ImportAndroid.view.ViewGroup; ImportAndroid.widget.BaseAdapter; ImportAndroid.widget.GridView; ImportAndroid.widget.ImageView;  Public classMyHomeextendsActivity {GridView mgrid; @Override Public voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);                   Loadapps ();                   Setcontentview (R.layout.main); Mgrid=(GridView) Findviewbyid (r.id.apps_list); Mgrid.setadapter (NewAppsadapter ()); }                       PrivateList<resolveinfo>Mapps; Private voidLoadapps () {Intent mainintent=NewIntent (Intent.action_main,NULL);                      Mainintent.addcategory (Intent.category_launcher); Mapps= Getpackagemanager (). Queryintentactivities (mainintent, 0); }                Public classAppsadapterextendsBaseadapter { PublicAppsadapter () {} PublicView GetView (intposition, View Convertview, ViewGroup parent)                               {ImageView i; if(Convertview = =NULL) {i=NewImageView (myhome. This);                                   I.setscaletype (ImageView.ScaleType.FIT_CENTER); I.setlayoutparams (NewGridview.layoutparams (50, 50)); } Else{i=(ImageView) Convertview; } ResolveInfo Info=Mapps.get (position);                               I.setimagedrawable (Info.activityInfo.loadIcon (Getpackagemanager ())); returni; }                            Public Final intGetCount () {returnmapps.size (); }                        Public FinalObject GetItem (intposition) {                           returnMapps.get (position); }                        Public Final LongGetitemid (intposition) {                           returnposition; }           }   }

You can set up a click Listener to open the app:

 Public voidOnitemclick (adapterview<?> Parent, view view,intPositionLongID) {ResolveInfo info=Mapps.get (position); //the package name of the appString pkg =Info.activityInfo.packageName; //The main activity class of the applicationString CLS =Info.activityInfo.name; ComponentName componet=Newcomponentname (pkg, CLS); Intent I=NewIntent ();                  I.setcomponent (componet);          StartActivity (i); }

I'm the dividing line of the king of the Land Tiger.

Android--Queryintentactivities