Android Custom Components

Official documents

/myselfcomponent/res/values/attrs.xml

<?xml version= "1.0" encoding= "Utf-8"?><resources> <declare-styleable name= "MyView" > &L T;attr name= "TextColor" format= "color"/> <attr name= "textSize" format= "Dimension"/> <attr name= "Text" format= "string" ></attr> </declare-styleable></resources>

Activity_main.xml

<relativelayout xmlns:android= "Http://schemas.android.com/apk/res/android"      xmlns:tools= "Http://schemas.android.com/tools"     android:layout_width= "Match_parent"     android:layout_height= "Match_parent"     android:paddingbottom= "@ Dimen/activity_vertical_margin "    android:paddingleft=" @dimen/activity_horizontal_margin "     android:paddingright= "@dimen/activity_horizontal_margin"      android:paddingtop= "@dimen/activity_vertical_margin"     tools:context= " Com.example.myselfcomponent.MainActivity " xmlns:my=" http://schemas.android.com/apk/res/ Com.example.myselfcomponent ">    <com.example.myselfcomponent.MyView          android:id= "@+id/myview1"          android:layout_width= "Match_parent"         android:layout_height= "Wrap_content"         my: Textcolor= "#00ffff"         my:textsize= "20SP"          my:text= "Custom Components"                  /></RelativeLayout><!--The prefix of the  my:textcolor= "#00ffff" is related to the namespace (tools : context= "com.example.myselfcomponent.MainActivity"  xmlns:my= "http://schemas.android.com/apk/res/ Com.example.myselfcomponent ">", you can customize  -->

MyView

Package com.example.myselfcomponent;import android. R.integer;import android. r.style;import android.content.context;import android.content.res.typedarray;import  android.graphics.canvas;import android.graphics.color;import android.graphics.paint;import  Android.graphics.paint.style;import android.graphics.rect;import android.util.attributeset;import  android.view.View;/** *  Custom Components  * */public class MyView extends  view{//Brush paint paint; String text;public myview (Context context)  {super (Context);p aint=new paint (); Paint.setcolor (Color.Black);p aint.settextsize ();// todo auto-generated constructor stub} Public myview (context context,attributeset attrs)  {// TODO Auto-generated  Constructor stubsuper (context, attrs);p aint=new paint (); Typedarray typedarray=context.obtainstyledattributes (Attrs,r.styleAble. MyView); Int color=typedarray.getcolor (R.STYLEABLE.MYVIEW_TEXTCOLOR, 0XFFFFFF); float size= Typedarray.getdimension (r.styleable.myview_textsize, 20); Text=typedarray.getstring (R.styleable.MyView_ Text);p Aint.setcolor (color);p aint.settextsize (size);//Close Resource typedarray.recycle ();} /** *  is triggered when the component is initialized, rendering of components  * Canvas    canvas  * */@Overrideprotected  void ondraw (Canvas canvas)  {// TODO Auto-generated method  Stubsuper.ondraw (canvas);//Set brush style is solid paint.setstyle (Style.fill);//Draw Square canvas.drawrect (New rect ( 10,10,90,90),  paint);p Aint.setcolor (Color.Blue); Canvas.drawtext (Text, 10, 110, paint);}}

Mainactivity

Package com.example.myselfcomponent;import android.app.activity;import android.os.bundle;import  android.view.menu;import android.view.menuitem;public class mainactivity extends  Activity {  @Overrideprotected  void oncreate (bundle savedinstancestate)  { Super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main);} @Overridepublic  boolean oncreateoptionsmenu (Menu menu)  {// inflate the menu ; this adds items to the action bar if it is  Present.getmenuinflater (). Inflate (r.menu.main, menu); return true;} @Overridepublic  boolean onoptionsitemselected (Menuitem item)  {// handle action  bar item clicks here. The action bar will// automatically  Handle clicks on the home/up button, so long// as you specify a parent activity in AndroidManifest.xml.int id =  Item.getitemid ();if  (id == r.id.action_settings)  {return true;} return super.onoptionsitemselected (item);}}

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Android Custom Components