1. Basically the ApiDemo activity just calls itself recursively, is it
counter-intuitive to efficient running on mobile device?

2. The following code in getData():
        PackageManager pm = getPackageManager();
        List<ResolveInfo> list = pm.queryIntentActivities(mainIntent,
0);

        if (null == list)
            return myData;
...
Can it be moved to somewhere for efficency purpose? Since it gets
called again and again but just gets same results.

3. Consider the code in getDate():
        Map<String, Boolean> entries = new HashMap<String, Boolean>();
...
Why use Hashmap? isn't it overskilled?

Again, since it is the demo code provided by Google, I think it is
worthy to study it in detail.
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