Install an Android IDE on your phone or tablet, such as AIDE, Sketchware, or AndroidIDE
Install the required SDKs, build tools, and Java/Kotlin support if the app asks for them
Create a new project
Choose a template such as Empty Activity
Set the app name, package name, and minimum Android version
Write the app code in Java or Kotlin
Design the user interface using XML or a visual editor
Add app resources such as icons, images, colors, and strings
Run the app on the built-in emulator if available
Connect a real Android device for testing if needed
Grant storage and development permissions if required
Fix errors shown by the compiler or log output
Build the APK
Install the APK on your device
Test all screens, buttons, and features
Publish the APK to a distribution platform if desired