This was my original question:
I want to be able to open a pdf file in my app using the android's built in pdf viewer app, but i dont know how to start other apps. I'm sure i have to call start activity, i just dont know how to identify the app im opening and how to pass the file to that specific app.
Anyone have a clue?
I just learned that the pdf viewer i have on my phone is actually made by HTC and that Adobe just barely released their android pdf viewer (which is great). So the new question is this: how do i verify that the user has installed adobe's viewer, and then how do i open the file in that app from my app?
You can programmatically determine whether a suitable application exists on the user's device, without catching exceptions.
Intent intent = new Intent(Intent.ACTION_VIEW,
Uri.parse("path-to-document"));
intent.setType("application/pdf");
PackageManager pm = getPackageManager();
List<ResolveInfo> activities = pm.queryIntentActivities(intent, 0);
if (activities.size() > 0) {
startActivity(intent);
} else {
// Do something else here. Maybe pop up a Dialog or Toast
}