检测编程应用程序是否安装在Android [英] Detecting programmatically whether an app is installed on Android

问题描述

我已经注册的URL方案为我的Andr​​oid应用（假设的myapp：//主机）。

I have registered a url scheme for my Android app (let's say myapp://host).

在我的其他应用程序，我可以通过使用意图启动该应用程序，但我要如何检查是否安装了第一个应用程序，而无需启动呢？

On my other app, I can launch that app by using Intent, but how do I check whether the first app is installed without launching it?

在iOS上，它是那么容易，因为

in iOS, it is as easy as

[[UIApplication sharedApplication] canOpenUrl:@"myapp://"];

有Android中的等价？ （简单的方法）

is there an equivalent in Android? (easy way)

我想使用URL方案进行检查。我知道如何使用包名去检查，但我不知道如何从PackageInfo获得url方案，以及...（更难方式）

I'd like to check using url scheme. I know how to check using package name, but I do not know how to get the url scheme from PackageInfo as well... (harder way)

    PackageManager pm = m_cContext.getPackageManager();
    boolean installed = false;
    try {
        @SuppressWarnings("unused")
        PackageInfo pInfo = pm.getPackageInfo(szPackageName, PackageManager.GET_ACTIVITIES);
        installed = true;
    } 
    catch (PackageManager.NameNotFoundException e) {
        installed = false;
    }

在此先感谢！

请注意：这是iOS的同一个问​​题的Andr​​oid版本：
<一href=\"http://stackoverflow.com/questions/3808691/detecting-programmatically-whether-an-app-is-installed-on-iphone/3808757#comment16408047_3808757\">Detecting一个应用程序编程是否安装在i​​Phone上

Note: This is the Android version of the same question for iOS: Detecting programmatically whether an app is installed on iPhone

推荐答案

如果你知道如何启动应用程序，然后创建启动您的应用的意图，然后调用queryIntentActivities

If you know how to launch the app, then create the intent that launches your app and then call queryIntentActivities

 Intent intent = //your app launching intent goes here
 PackageManager packageManager = mContext.getPackageManager();
 List<ResolveInfo> resolvedActivities = packageManager.queryIntentActivities(intent,0);
 if(resolvedActivities.size() >0)
     \\present

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