了解是否安装了应用程序 [英] Find out if app is installed

问题描述

我认为这个问题说得很清楚：最好的方法是找出用户是否在手机上安装了Facebook或Whatsapp？我必须去包裹或者最好的方法是什么？

I think the question says it all: What is the best way to find out if the user has installed Facebook or Whatsapp on his phone? Do I have to go over the package or what is the best way for this?

推荐答案

这个问题回答了此处。您可以使用以下代码来检查程序包名称

This was question was answered here. You can using the following piece of code to check for the package name

com.facebook.android OR com.facebook.katana

com.facebook.android OR com.facebook.katana

代码：

public class Example extends Activity
    {
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            //Put the package name here...
            boolean installed  =   appInstalledOrNot("com.facebook.android");  
            if(installed)
            {
            //This intent will help you to launch if the package is already installed
            Intent LaunchIntent = getPackageManager()
                .getLaunchIntentForPackage("com.facebook.android");
        startActivity(LaunchIntent);


                      System.out.println("App already installed om your phone");


            }
            else
            {
                System.out.println("App is not installed om your phone");
            }
        }
        private boolean appInstalledOrNot(String uri)
        {
            PackageManager pm = getPackageManager();
            boolean app_installed = false;
            try
            {
                   pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
                   app_installed = true;
            }
            catch (PackageManager.NameNotFoundException e)
            {
                   app_installed = false;
            }
            return app_installed ;
    }
    }

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