AsyncTask
An AsyncTask lets you perform operations in the background. When they’ve finished running, it then allows…
AppCompatActivity class
The AppCompatActivity class is a subclass of Activity. It lives in the AppCompat Support Library, and…
Support Libraries
The Android Support Libraries provide backward compatibility with older versions of Android. THey sit outside the…
What fragment code looks like
When you create a fragment, Android Studio creates two files for you: Java code for the…
android:gravity
android:gravity=”value” android:gravity lets you say where you want the view’s contents to appear inside the view…
android:layout_gravity
android:layout_gravity lets you say where you want views to appear in their available space. android:layout_gravity deals…
LinearLayout
How you specify a linear layout You specify a linear layout using <LinearLayout>. You must specify…
The State of an activity
When Android creates and destroys an activity, the activity moves from being launched to running to…