Chapter 1 Projects: MyFirstApp Chapter 2 Projects BeerAdviser Chapter 3 Projects Messenger Chapter 4 Projects Stopwatch Chapter 5 Projects DrinkExercise Content Layouts RelativeLayout below align_left etc ... LinearLayout Orientation Hint Weight Gravity Layout Gravity GridLayout Column count layout_row layout_column column_spam ViewGroup View review TextView use sp(scale-independent pixels) to define textSize EditText inputType Button onClick drawable - image ToggleButton textOn and textOff onClick Switch textOn and textOff onClick CheckBox onClick RadioButton Orientation onClick Spinner entries (string array) ImageView app/src/main/res/drawable - default folder Different images according to the device dpi android-ldpi mdpi hdpi etc src contentDescription ImageButton src onClick ScrollView | HorizontalScrollView This becomes the root element (put the properties of the layout) Toasts makeText show Chapter 6