Android-widget Source Code Analysis

View and how all controls are aware of the control ID that we set in the layout.

"Attrs.xml file"

# attrs.xml file. <declare-styleable name= "View" > <!--reference represents a resource file!! --<attr name= "id" format= "reference"/> ... (n more info ha, see Code yourself) </declare-styleable>

"The initialization of the View"

 public static final int no_id = -1;  ... ... @ Viewdebug.exportedproperty (resolveid = true)  //  (note)  android-19/android/view/ viewdebug.java int mid = no_id; //  Save control ID, default value -1. ... ...      public view (context context, attributeset attrs, int  DEFSTYLEATTR)  {        this (context);         //  get view.         in the Attrs.xml properties file Typedarray a = context.obtainstyledattributes (                    attrs,  com.android.internal.r.styleable.view, defstyleattr, 0);        &NBSP;...&NBSP;...&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;...&NBSP, ..... (N Multiple codes,Omitted!)         for  (int i = 0; i < n;  i++)  {            int attr =  a.getindex (i);            switch  (attr)  {                  ...  .. (n multiple code, omitted!!)                 case  com.android.internal.r.styleable.view_id: //  the control ID to get the field in the View id.                     mID =  A.getresourceid (attr, no_id);                     break;

"Set control ID"

Sets the control ID.        public void setId (int id) {MID = ID;        if (Mid = = view.no_id && Mlabelforid! = view.no_id) {mid = Generateviewid (); }    }

"Get control ID"

Gets the control ID.    @ViewDebug. Capturedviewproperty public int getId () {return mID; }

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