如何檢測Android手機是否安裝了特定的應用程序？

Question

我已經這樣做了iPhone應用程序的檢測，使用此處描述的meta標籤：

http://developer.apple.com/library/ios/#documentation/AppleApplications/Reference/SafariWebContent/PromotingAppswithAppBanners/PromotingAppswithAppBanners.html

現在我想要做的Droid的應用程序內嗅相同。基本上，我想檢查用戶是否安裝了「嗅探」應用程序。

Answer 1

從這：How to get a list of installed android applications and pick one to run

final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); 
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); 
final List pkgAppsList = context.getPackageManager().queryIntentActivities(mainIntent, 0); 

現在，從pkgAppList你可以看到，如果安裝該應用程序

Answer 2

智能手機是否已安裝如何檢測一個Android應用程序？

爲了使代碼工作改變"com.your.package.appname.id"與應用程序ID。

id是應用程序包，也是市場url例如。在市場上的Gmail應用網址https://play.google.com/store/apps/details?id=com.google.android.gm和ID /包是com.google.android.gm

import android.app.Activity; 
import android.content.pm.PackageManager; 
import android.os.Bundle; 

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.your.package.appname.id"); 
     if(installed) 
     { 
        System.out.println("App already installed om your android"); 
     } 
     else 
     { 
      System.out.println("App is not installed om your android"); 
     } 
    } 
    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 ; 
} 
}