Android you have to look at the naming conventions

There are four types of identifier naming methods:

• Camel (Camel) nomenclature: Except for the first word, the first letter of all the remaining words is capitalized, such as: FooBar;
• Pascal nomenclature: The first letter of all words capitalized, such as: FooBar;
• Underline naming method: The word and the word with the underscore between the interval, such as: Foo_bar;
• Hungarian nomenclature: Widely used in Microsoft programming environment, in the Pascal nomenclature variable, the first letter lowercase description of the variable type. The number of names is: Scope_ prefix_qualifier range prefix, type prefix, qualifier, such as: G_foo_bar;

Android app Layer development is mainly the Java language, so the basic use in addition to the Hungarian nomenclature outside the naming method;

abbreviations are required in naming and follow the following rules:

• Shorter words can be abbreviated by removing "vowels", such as icon->ic;
• A longer word is preferable to the first few letters of a word to form abbreviations, such as:average->avg;
• In addition, there are some agreed idiomatic English word abbreviations, such as internationalization->i18n;
• Do not use abbreviations in the program, unless the abbreviation is customary.

Naming conventions:

• Package (packages): Use the anti-domain naming rules, all using lowercase letters. The first level of the package name is the top-level domain name, such as COM, two-level package named XX (can be a company or personal casually), three-level package name according to the application of the name, four-level package named Module name or hierarchy name; such as Com.tinyx.myapp.activities;
• Class (classes): with the Pascal nomenclature, as far as possible to avoid abbreviations, such as: myactivity; abbreviations are well known, such as Html,url; The class name contains a word abbreviation, each letter of the acronym should be capitalized, such as: publichtml, Commonurl.
• interface (interface): the same as the class with the Pascal nomenclature, more with able or ible end, more used as a representation of behavior, such as runnable,accessible;

• Methods (methods): verbs or verb nouns, using the Camel name method, such as: OnCreate (), run (); Here are some suggestions:

  • Initializes the associated method, using init as the prefix identifier, such as: Initialize layout initview ();
  • Boolean uses is or check for prefix identification, such as: CheckValue (), isvalidate ();
  • A method that returns a value, using get as the prefix identifier, such as: GetName ();
  • Data for processing related, try to use process as the prefix identifier, such as: Processupdate ();
  • Save data related, use Save as prefix identifier, such as: SaveData ();
  • Resets the data, using the reset prefix identifier, such as: ResetData ();
  • Clear the data correlation, using the clear prefix identifier, such as: ClearData ();
  • Remove certain items, using the Remove prefix identifier, such as: RemoveItem ();
  • Draw data or effects related, using the draw prefix identifier, such as: Drawcircle ();
• variable (variables): The use of Pascal Nomenclature, it is recommended to use a meaningful name such as: Firstname,lastname; The model class variable defaults to the above rule

 Public class User {    public  String name;      Public String phone;      Public int // 1, male 2, female    Public User () {         this. Name = "MyName";          this. Phone = "123" This        . sex = 0;    }}

• The non-model class global parameters are suggested with a lowercase m opening;

 Public class extends activity{    private  zoomableimageview Mzoomableview;     Private tablayout mtablayout;     Private int Mitemscount;   @Override    protectedvoid  onCreate (Bundle savedinstancestate) {         Super . OnCreate (savedinstancestate);        Setcontentview (r.layout.test_activity);    }}

constant (constants): all uppercase, using the underscore name method as follows:

 Public Static Final int max_items=;  Public Static Final String TAG = User. class. Getsimplename ();

resource file naming (resources): using the underscore naming method, all lowercase, for different resources, the following naming method is recommended;

• drawable resource, prefix name: Prefix _ function _ module _ description. xml/png/

Description	naming Examples
Icon: suggested format ic_xxx;	Ic_appicon.png
Background: suggested format bg_xxx;	Bg_normal_button_default.xml,bg_normal_button_press.xml

• Layout resource file, prefix naming: Type _ Module _ function _ Description. XML, to cite some common examples are as follows:

Description	naming Examples
Activity layout File	Activity_main.xml
Fragment Layout file	Fragment_main.xml
Partial layout view File	View_main_header.xml,view_main_bottom.xml
Custom Prompt dialog box	Dialog_alert.xml
List items, etc.	Fragment_user_list_item.xml

• Animation Anim resource file (Anim has only one resource, so it doesn't have to be prefixed): Module _ function _ animation _ direction. Xml

Description	naming Examples
Fade	Main_button_fade_in.xml
Out	Main_button_fade_out.xml
Push in from below	Button_push_down_in.xml
Launched from below	Main_button_push_down_out.xml

• The menu resource file (menu has only one resource, so it does not have to be prefixed to differentiate), module _ function _ description. XML

Description	naming Examples
Main interface Menu	Main_activity.xml
Fragment Interface Menu	User_fragment.xml

• Values resources, which are mainly divided into the following resources:

1, IDS resources, the main storage is the ID value of the interface control, with the underscore lowercase naming method, prefix method: Prefix _ Module _ function _ Description, commonly used interface control named as follows:

Description	naming Examples
Layout and child controls (ViewGroup, custom view)	View_main_topnav
TextView	Tv_main_title
Button	Btn_user_add
ImageButton	Imgbtn_user_del
ImageView	Img_thumb
CheckBox	Cb_sex
RadioButton	Rbtn_answer
EditText	Et_username
ToggleButton	Toggle_funtion
ProgressBar	Pb_download
SeekBar	Sb_progress
ProgressBar	Pb_download
Videoview	Vv_course
WebView	Wv_download
Rantingbar	Rb_download
Spinner	Sp_cities
Scollview	Sv_main
Textswitch	Sp_cities
Listview/expandlistview/recyclerview	Lv_cities
Mapview	Mv_location

2, Strings/arrays/dimens resources, with the lower-case naming method, without any prefix, format, module _ function _ Description

3, the Attrs/colors/ids attribute and the name use the Camel name law; The Styles property uses the Camel nomenclature, which uses the Pascal name method;

<!--attrs--><attr name= "text" format= "string"/><attr name= "Itemicon" format= "Reference"/>< attr name= "Showtoggle" format= "boolean"/><attr name= "Showversion" format= "boolean"/><style name= " Theme.AppCompat.Light.NoActionBar ">        <item name=" Windowactionbar ">false</item>        <item name= "Windownotitle" >true</item></style> <!--colors--> <color name= " Colorprimary "> #009688 </color> <color name=" Colorprimarydark "> #00796b </color> <color name=" Coloraccent "> #cddc39 </color> <!--ids--> <item name=" tablayout "type=" id "/> <item name=" Viewpager "type=" id "/> <item name=" Viewcontainer "type=" id "/>

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Android you have to look at the naming conventions