(31) Tool method: Get application Package name/install apk/How to get the current stack top activity/android how to implement click a button to enter the specified page

(1), get the application package name code

/*** Get the version number of the current application * *@return     */    PrivateString getversion () {Try{Packagemanager Manager= Getpackagemanager ();//Get package Management ServicePackageInfo Clientinfo =Manager. Getpackageinfo (Getpackagename (),0);//get information about a package            returnClientinfo.versionname; } Catch(Exception e) {//TODO auto-generated Catch blockE.printstacktrace (); return"Version number Unknown"; }    }

(2), install APK

/**      * Install apk     *      @param  file     */    privatevoid  Install (file file) {        new  Intent ();        Intent.setaction (Intent.action_view);        Intent.setdataandtype (uri.fromfile (file),                "application/vnd.android.package-archive");        Finish ();        StartActivity (intent);    }

(3), how to get the activity at the top of the current stack.

The total steps are:

1. Get the activity manager of the current operating environment (context);

2. Get the current task stack information through the Activity manager;

3. Get the name of the activity at the top of the stack from the task stack.

String Get Topactivity (Activity context)    {        = (Activitymanager) Context.getsystemservice (activity_service);        List<RunningTaskInfo> Runningtaskinfos = manager.getrunningtasks (1);         if NULL )            return (runningtaskinfos.get (0). topactivity). toString ();         Else            return NULL  ;    }    Finally, don't forget to add permissions in Androidmanifest.xml:<uses-permission android:name = "Android.permission.GET_TASKS"/>

4, Android How to achieve click on a button to enter the specified page

Uri uri = uri.parse ("http://www.baidu.com"new  Intent (Intent.action_view, URI); StartActivity ( Intent);

(31) Tool method: Get application Package name/install apk/How to get the current stack top activity/android how to implement click a button to enter the specified page