Here you can find the source of isAppInstalled(Context ctx, String uri)
public static boolean isAppInstalled(Context ctx, String uri)
//package com.java2s; import android.content.Context; import android.content.pm.PackageManager; public class Main { public static boolean isAppInstalled(Context ctx, String uri) { PackageManager pm = ctx.getPackageManager(); boolean installed = false; try {//from www .j a v a 2 s. com pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES); installed = true; } catch (PackageManager.NameNotFoundException e) { installed = false; } return installed; } }