Android QR检查是否已安装应用程序

Question

I'm scanning QR code (where specific data is coded) with QR scanner. If my app is installed on the device, the app is launched. If the app doesn't installed then it takes the user the marketplace to download the app. I've searched a lot on internet and only found this question.

Here's activity from manifest file which is called when QR code is scanned

<activity android:name=".map.TestQrOpenActivity">
            <intent-filter>
                <action android:name="android.intent.action.VIEW"/>
                <category android:name="android.intent.category.DEFAULT"/>
                <category android:name="android.intent.category.BROWSABLE"/>
                <data android:scheme="uniqueapp"/>
            </intent-filter>
</activity>

and here's the string which is coded in my QR code

uniqueapp://myData

and that works perfectly if app installed in device, but if it's not installed I need to go to google play and download it basically if app exist open uniqueapp://myData else open market://details?id=com.my.package.name So is this possible? (I don't whant to write my own scanner)

Answer 1

Try this

 public static boolean intentIsAvailable(Context ctx, Intent intent) {
   final PackageManager mgr = ctx.getPackageManager();
   List<ResolveInfo> list =
      mgr.queryIntentActivities(intent, 
         PackageManager.MATCH_DEFAULT_ONLY);
   return list.size() > 0;
}

Answer 2

Reframing the question:

From what I'm reading, I think you want to accomplish the following:

1. Read my QR code with my app
2. Read my QR code with any other QR reader
3. Always send the QR data to my app or my website.
4. If my app is not installed, help the user get my app installed.

I think you solve all four of the use cases I'm describing with app links.

Android App Links:

http://developer.android.com/training/app-links/index.html

With an app link you could put your URL in front, and have your app intercept it if the app is installed, and if not installed, android would simply send people to your website. Once they're on your website, you could tell them they need to install your app.

Answer 3

Maybe this is the solution for u:

appurl

Note: The app will always try the first url then fallback to the second url. For example under "iOS - iPhone" if you wanted to open the tweetbot app you would add tweetbot:// to the first text field then add the iTunes store url to the second text field. When a user taps on the link if they are on their iPhone it will check to see if the user has tweetbot installed, if not it will take them to the iTunes store.

It generates a URL and a QR Code Hope this is what u need.

Answer 4

I recommend using ZXing Android Embedded .

This way you don't have to write your own scanner and the user doesn't have to install anything else.