After building an Android project with Android Studio, what is the purpose of generating R.java as follows?  package com.intelstar.venus; public final class R {      public static final class attr {      }      public static final class drawable {          public static final int icon=0x7f020000;      }      public static final class layout {          public static final int main=0x7f030000;      }      public static final class string {          public static final int app_name=0x7f040000;      } }

If you are going to check a network connection with the below source code, what would be required to make it work? public boolean isOnline() { ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = cm.getActiveNetworkInfo(); if (netInfo != null && netInfo.isConnectedOrConnecting()) return true; return false; }

What's the output? final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); final List pkgAppsList = getPackageManager().queryIntentActivities(mainIntent, 0); for (Object object : pkgAppsList) { ResolveInfo info = (ResolveInfo) object; File file = new File(info.activityInfo.applicationInfo.publicSourceDir); // … }

Which common design patterns are used in Android?

Following methods called during the life cycle of an android activity are?

Which are possible states of a process?

Which method should be used to refresh the ActionBar if you use ActionBarCompat library?

How to notify a Fragment is visible when they are inside a ViewPager?

Which AsyncTask method does not run on the UI thread?

What class does Android use to communicate a request for an action to be performed?

Why is a Parcelable used?