See this Package by feature, not layer

• <PRODUCT_NAME>Application.java - for Application class
• <NAME>Activity.java - for activity class
• <NAME>Adapter.java - for adapter class
• <NAME>Fragment.java - for fragment class
• <NAME>.java - for model class
• <NAME>Provider.java - for content provider class
• <NAME>Service.java - for service class
• <NAME>Receiver.java - for broadcast receiver class
• <NAME>Utils.java - for utility class
• <NAME>.java - for custom view class

Note: You should use more meaningful names than these short names unless you have two or more same kind of views in the same place.

• aclock - AnalogClock
• actv - AutoCompleteTextView
• btn - Button
• cal - CalendarView
• chb - CheckBox
• chtv - CheckedTextView
• chron - Chronometer
• dp - DatePicker
• edt - EditText
• explv - ExpandableListView
• fl - FrameLayout
• gl - GridLayout
• grv - GridView
• hsv - HorizontalScrollView
• imb - ImageButton
• ims - ImageSwitcher
• imv - ImageView
• ll - LinearLayout
• lsv - ListView
• ctlr - MediaController
• mactv - MultiAutoCompleteTextView
• np - NumberPicker
• pm - PopupMenu
• pw - PopupWindow
• pgb - ProgressBar
• rb - RadioButton
• rg - RadioGroup
• rtb - RatingBar
• rl - RelativeLayout
• rv - RemoteViews
• scv - ScrollView
• schv - SearchView
• skb - SeekBar
• sap - ShareActionProvider
• space - Space
• spn - Spinner
• stv - StackView
• sw - Switch
• tabh - TabHost
• tabc - TabHost.TabSpec
• tl - TableLayout
• tr - TableRow
• twg - TabWidget
• tclock - TextClock
• tsw - TextSwitcher
• txv - TextView
• tp - TimePicker
• toast - Toast
• tgb - ToggleButton
• vdv - VideoView
• vf - ViewFlipper
• vsw - ViewSwitcher

See this Android-Cheatsheet-For-Graphic-Designers#Naming Convention

• <INTERPOLATOR_NAME>_interpolator.xml - for custom interpolator
• <ANIMATION_NAME>.xml - for custom animation

• <ANIMATOR_NAME>.xml- for custom animator

• selector_<COLOR_NAME>.xml - for color state list

• bmp_<BITMAP_NAME>.xml - for bitmap file
• np_<NINE_PATCH_NAME>.xml - for nine-patch XML file
• layer_<LAYER_LIST_NAME>.xml - for layer list
• selector_<STATE_LIST_NAME>.xml - for state list
• anim_<DRAWABLE_ANIMATION_NAME>.xml - for drawable animation
• level_<LEVEL_LIST_NAME>.xml - for level list
• trans_<TRANSITION_DRAWABLE_NAME>.xml - for transition drawable
• inset_<INSET_DRAWABLE_NAME>.xml - for inset drawable
• clip_<CLIP_DRAWABLE_NAME>.xml - for clip drawable
• scale_<SCALE_DRAWABLE_NAME>.xml - for scale drawable
• shape_<SHAPE_DRAWABLE_NAME>.xml - for shape drawable

• activity_<ACTIVITY_NAME>.xml - for activity
• dialog_<DIALOG_NAME>.xml - for dialog
• list_item_<LIST_NAME>.xml - for list item in ListView
• grid_item_<GRID_NAME>.xml - for grid item in GridView
• fragment_<FRAGMENT_NAME>.xml - for fragment
• layout_<LAYOUT_NAME>.xml - for re-useable layout
• merge_<MERGE_NAME>.xml - for <merge> Tag only
• widget_<WIDGET_NAME>.xml - for custom view
• appwidget_<APPWIDGET_NAME>.xml - for app widget

• <MENU_NAME>.xml - for option menu
• contextual_<MENU_NAME>.xml - for contextual menu
• popup_<MENU_NAME>.xml - for popup menu

• values/colors.xml

  • <color name="<THEME_NAME>_<COLOR_NAME>"><COLOR_VALUE></color>

    For example:

    <color name=”holo_blue_dark”>#ff0099cc</color> 
    <color name=”material_blue_500”>#5677fc</color>
    

  • If the color is not in the theme:

    <color name="<COLOR_NAME>"><COLOR_VALUE></color>

• values/strings.xml

  • <string name="title_<TITLE_NAME>"><TITLE_VALUE></string> - for ActionBar title
  • <string name="action_<ACTION_BUTTON_TEXT>"><TEXT_VALUE></string> - for ActionBar button text
  • <string name="tab_<ACTION_TAB_TEXT>"><TEXT_VALUE></string> - for ActionBar.Tab text
  • <string name="btn_<BUTTON_TEXT>"><TEXT_VALUE></string>- for button
  • <string name="empty_<VIEW_NAME>"><EMPTY_VALUE></string> - for empty view
  • <string name="hint_<EDITTEXT_NAME>"><HINT_VALUE></string>- for the hint of EditText/AutoCompleteTextView
  • <string name="label_<TEXTVIEW_NAME>"><TEXT_VALUE></string>- for static TextView
  • <string name="toast_<TOAST_NAME>"><TOAST_VALUE></string> - for toast
  • <string name="dialog_title_<DIALOG_NAME>"><TITLE_VALUE></string>- for dialog
  • <string name="dialog_msg_<DIALOG_NAME>"><MSG_VALUE></string> - for dialog
  • <string name="dialog_action_<ACTION_NAME>"><ACTION_NAME></string> - for dialog button
  • <string name="msg_<MESSAGE_NAME>"><MSG_VALUE></string> - for Log or some other stuff
  • <string name="contextual_<MENU_ITEM_NAME>"><TEXT_VALUE></string>- for contextual menu item
  • <string name="popup_<MENU_ITEM_NAME>"><TEXT_VALUE></string> - for popup menu item

• values/string_arrays.xml

  <string-array name="<ARRAY_NAME>_array">

• values/plurals.xml

  <plurals name="<PLURALS_NAME>">

• appwidget_<APPWIDGET_NAME> - for app widget provider