Android determines whether an application exists and Android disables the entire application

Identify by package name

public boolean checkBrowser(String packageName) {         if (packageName == null || "".equals(packageName))             return false;         try {             ApplicationInfo info = getPackageManager().getApplicationInfo(                     packageName, PackageManager.GET_UNINSTALLED_PACKAGES);             return true;         } catch (NameNotFoundException e) {             return false;         }     }

Determine the activity in the package

Intent intent = new Intent(Intent.ACTION_VIEW);         intent.setClassName("com.android.settings", //$NON-NLS-1$                 "com.android.settings.InstalledAppDetails"); //$NON-NLS-1$         intent.putExtra("com.android.settings.ApplicationPkgName", //$NON-NLS-1$                 mCurrentPkgName);         List<ResolveInfo> acts = getPackageManager().queryIntentActivities(                 intent, 0);         if (acts.size() > 0) {             startActivity(intent);         } else {             Toast.makeText(this,                     getString(R.string.failed_to_resolve_activity),                     Toast.LENGTH_SHORT).show();         }

Android disables the entire application

When an application is no longer used, you usually need to disable the application. You can use the following method to disable the Android Application:

Method 1: first obtain the ID of the current process and then kill the process.
Android. OS. process. killprocess (Android. OS. process. mypid ())

Method 2: Terminate the currently running Java virtual machine, resulting in program termination
System. Exit (0 );

Method 3: Force disable all executions associated with the package
Activitymanager manager = (activitymanager) getsystemservice (context. activity_service );
Manager. restartpackage (getpackagename ());
<Uses-Permission Android: Name = "android. Permission. restart_packages"/>