What does the following code do? Calendar cal = Calendar.getInstance(); DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); cal.add(Calendar.DATE, -1); return dateFormat.format(cal.getTime());

What's the output? Values/google_maps_api.xml google_maps_key (key from https://console.developers.google.com/) AndroidManifest.xml Build.gradle(Module: app) Dependencies{ … Compile ‘com.google.android.gms:play-services:8.4.0’ }

What's the output? public int pxToDp(int px) { DisplayMetrics displayMetrics = getContext().getResources().getDisplayMetrics(); int dp = Math.round(px / (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT)); return dp; } public int dpToPx(int dp) { DisplayMetrics displayMetrics = getContext().getResources().getDisplayMetrics(); int px = Math.round(dp * (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT)); return px; }

what is the purpose of generating R.java as follows?

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); // … }

What should you do if you want access list of paired Bluetooth devices on Android?

Default behavior of an Activity when you manually rotate the device screen?

Which theme's attribute changes the color of the status bar in Lollipop?

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?