Android - 检查是否存在Facebook应用程序返回错误的结果 [英] Android - check if Facebook app exists returns wrong result

问题描述

 
我在FB本机应用程序的通知中收到通知，如果它已安装在应用程序和浏览器中，请使用以下代码： code> PackageManager packageManager = context.getPackageManager（）; 
尝试{
 packageManager.getPackageInfo（com.facebook.katana，PackageManager.GET_ACTIVITIES）; 
 return context.getString（R.string.fb_app_prefix）+ fb_url; 
} catch（PackageManager.NameNotFoundException e）{
 return context.getString（R.string.fb_site_prefix）+ fb_url; //普通网络mUrl 
} 
  

它适用于大多数设备（包括模拟器）但是在其中一些中，尽管未安装该应用程序，但它并没有发生错误。

我的代码有什么问题？

我可以为每个链接添加以下代码，但不能确定它是健康：

 意图testIntent = new Intent（Intent.ACTION_VIEW，Uri.parse（fb_app_url））; 
 if（testIntent.resolveActivity（packageManager）！= null）{
 return fb_app_url; 
} 
  

解决方案

  public static boolean isPackageExisted（Context c，String targetPackage）{
 PackageManager pm = c.getPackageManager（）; 
 try {
 PackageInfo info = pm.getPackageInfo（targetPackage，
 PackageManager.GET_META_DATA）; 
} catch（NameNotFoundException e）{
 return false; 
} 
返回true; 
} 
  

I'm opening links received in notifications in FB native app if it's installed on the app and in the browser otherwise, using this code:

PackageManager packageManager = context.getPackageManager();
try {
    packageManager.getPackageInfo("com.facebook.katana", PackageManager.GET_ACTIVITIES);
    return context.getString(R.string.fb_app_prefix) + fb_url;
} catch (PackageManager.NameNotFoundException e) {
    return context.getString(R.string.fb_site_prefix) + fb_url; //normal web mUrl
}

It works on most devices (including the emulator), but in some of them it doesn't throw an error although the app isn't installed.

What's wrong with my code?

I can add the following code for every link I have but not sure it's "healthy":

Intent testIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(fb_app_url));
if (testIntent.resolveActivity(packageManager) != null) {
    return fb_app_url;
}

解决方案

public static boolean isPackageExisted(Context c, String targetPackage) {
 PackageManager pm = c.getPackageManager();
    try {
        PackageInfo info = pm.getPackageInfo(targetPackage,
                PackageManager.GET_META_DATA);
    } catch (NameNotFoundException e) {
        return false;
    }
    return true;
}

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