通过意向Zxing [英] Zxing via intent

问题描述

在我的应用程序使用斑马线库。我通过intent启动德zxing酒吧codescanner。但是，当用户没有安装吧codescanner。该应用程序停止工作。如何检查是否已安装了zxing酒吧codescanner？

In my application I use the zxing library. I start de zxing barcodescanner via intent. But when the user has no barcodescanner installed. The application stops working. How can I check if a zxing barcodescanner is already installed?

推荐答案

您可以使用下面的代码片段来检查是否安装了用户的设备上特定的应用程序

You can use following snippet to check if particular application is installed on user's device

try{
    ApplicationInfo info = getPackageManager().
            getApplicationInfo("com.facebook.android", 0 );
    return true;
} catch( PackageManager.NameNotFoundException e ){
    return false;
}

有关具体Zxing您将使用以下内容。

For Specific Zxing you will use following.

 Intent intent1 = new Intent("com.google.zxing.client.android.SCAN");
 List<ResolveInfo> list = getPackageManager().queryIntentActivities(intent1,     
            PackageManager.MATCH_DEFAULT_ONLY);    
        if(list.size() > 0)  
                // Zxing is available 
        else  
           // Zxing is not available       

一旦你找到Zxing可可以称之为如下：

Once you find Zxing is available you can call it as follows

public Button.OnClickListener mScan = new Button.OnClickListener() {
    public void onClick(View v) {
        Intent intent = new Intent("com.google.zxing.client.android.SCAN");
        intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
        startActivityForResult(intent, 0);
    }
};

public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == 0) {
        if (resultCode == RESULT_OK) {
            String contents = intent.getStringExtra("SCAN_RESULT");
            String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
            // Handle successful scan
        } else if (resultCode == RESULT_CANCELED) {
            // Handle cancel
        }
    }
}

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