Java tutorial
//package com.java2s; import android.content.Context; import android.content.pm.PackageManager; public class Main { public static boolean appInstalledOrNot(String uri, Context context) { PackageManager pm = context.getPackageManager(); boolean app_installed; try { pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES); app_installed = true; } catch (PackageManager.NameNotFoundException e) { app_installed = false; } return app_installed; } }