Android Development Notes

• Android API Guidelines
• Android API Reference
• Android Training

Hiding the Activity Titlebar

public void onCreate(Bundle savedInstanceState) {
    //Remove title bar
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);

    //Remove notification bar
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

    //Launch the Main layout
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
}

Software Keyboard: Next

android:nextFocusDown
The "next" soft button or the TAB key is looking for the next "down" focus.

Images

Icon Sizes

• Low-density (ldpi): 36x36
• Medium-density (mdpi): 48x48
• High-density (hdpi): 72x72
• Extra high-density (xhdpi): 96x96
• Recommended Initial Artboard Size: 864x864

Icon Naming Convention

Asset Type	Prefix	Example
Icons	ic_	ic_star.png
Launcher icons	ic_launcher	ic_launcher_calendar.png
Menu icons and Action Bar icons	ic_menu	ic_menu_archive.png
Status bar icons	ic_stat_notify	ic_stat_notify_msg.png
Tab icons	ic_tab	ic_tab_recent.png
Dialog icons	ic_dialog	ic_dialog_info.png

External Helpful Links

• Switching Activities and Passing Variables
• NumberPicker Example
• NineOldAndroids: Android library for using the Honeycomb (Android 3.0) animation API on all versions of the platform back to 1.0
• NineOldAndroids GitHub
• android-numberpicker: Android 4.0 NumberPicker backported to 2.1