Unlike iOS, which has a built-in PDF viewer – Android’s webview does not have PDF viewer built-in.
This is why it is going to fail in Android.
You have 2 choices in Android:
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View the file using Google Docs by storing the file at a remote server and redirecting the user like so:
window.open(encodeURI('https://docs.google.com/gview?embedded=true&url=http://www.your-server.com/files/your_file.pdf'), '_blank', 'location=yes,EnableViewPortScale=yes');
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Or use a Cordova plug-in. For example this one (you can search in Google for more). For this, you’ll need to learn how to create Cordova plug-ins in Worklight.
You can read more options here: Phonegap InAppBrowser display pdf 2.7.0