Introduction to Android Resources (Resource)

Android Apps (APP) resources are stored in the Res folder at the project level;

The types of resources include values (value), drawable, colors (color), layouts (layout), animations (animation), styles (style), menus (menu), XML files, and raw resources;

Also automatically creates an R-type file containing references to each resource in the project, location:app->build->source->r->debug;

Hello_world, resources as shown:

1. Simple values (value):

Simple values include: strings, colors (color), Dimensions (Dimens), styles (style), string arrays, or integer arrays;

Styles can be inherited, using parent tags, inheriting attributes;

2. Layout (layout)

The layout can be used to define the user interface for any visual component (including activity and fragment), and the filename is the resource identifier;

In activity, the layout uses Setcontentview padding (inflate) to enter the user interface;

Mainactivity, Code:

@Override
protected void onCreate (Bundle savedinstancestate) {  
    super.oncreate (savedinstancestate);  
    Setcontentview (R.layout.activity_main); Populate the user interface with the layout  

3. Menus (menu)

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After the menu resource is defined in XML, the menu can be filled (inflate) into the application through the inflate method of the Menuinflator service;

The file name is the resource identifier;

Mainactivity, Code:

@Override Public
Boolean oncreateoptionsmenu (Menu menu) {  
          
    //inflate the menu; This adds items to the Action bar I F it is present.  
    Getmenuinflater (). Inflate (R.menu.main, menu); Fill the menu with the user interface return  
    true;  
}

4. drawable

Includes bitmap and ninepatch (PNG image can be stretched), can be used as an icon, should meet the requirements of various sizes;

DPI = Dots-per-inch;

When the remaining resources are used, explain them again.

Author: csdn Blog spike_king