init and done with shared preferences

.gitignore

.idea/gradle.xml

.idea/misc.xml

.idea/modules.xml

.idea/runConfigurations.xml

app/.gitignore

app/build.gradle

app/proguard-rules.pro

...com/example/zohaibbutt/lab02/ExampleInstrumentedTest.java

app/src/main/AndroidManifest.xml

app/src/main/java/com/example/zohaibbutt/lab02/A1.java

app/src/main/java/com/example/zohaibbutt/lab02/A2.java

app/src/main/java/com/example/zohaibbutt/lab02/A3.java

app/src/main/res/drawable-v24/ic_launcher_foreground.xml

app/src/main/res/drawable/ic_launcher_background.xml

app/src/main/res/drawable/setting.png

app/src/main/res/layout/activity_a1.xml

app/src/main/res/layout/activity_a2.xml

app/src/main/res/layout/activity_a3.xml

app/src/main/res/layout/menu_bar.xml