无鸯 Android中自定义属性（attrs.xml，TypedArray）的使用，

本文主要是介绍无鸯 Android中自定义属性（attrs.xml，TypedArray）的使用，，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

这个例子比较全，很不错，

转自 http://www.oschina.net/code/snippet_163910_6283

package com.adnroid.test;

02

`03`	`import` `com.adnroid.test.R;`

04

`05`	`import` `android.content.Context;`

`06`	`import` `android.content.res.TypedArray;`

`07`	`import` `android.graphics.Canvas;`

`08`	`import` `android.graphics.Color;`

`09`	`import` `android.graphics.Paint;`

`10`	`import` `android.graphics.Rect;`

`11`	`import` `android.graphics.Paint.Style;`

`12`	`import` `android.util.AttributeSet;`

`13`	`import` `android.view.View;`

14

`15`	`public` `class` `MyView` `extends` `View {`

`16`	`private` `Paint myPaint;`

`17`	`private` `static` `final` `String myString =` `"Welcome to our Zoon!";`

18

`19`	`public` `MyView(Context context) {`

`20`	`super(context);`

`21`	`// TODO Auto-generated constructor stub`

22 }

23

`24`	`public` `MyView(Context context, AttributeSet attr) {`

`25`	`super(context, attr);`

`26`	`myPaint =` `new` `Paint();`

`27`	`TypedArray a = context.obtainStyledAttributes(attr, R.styleable.myView);//TypedArray是一个数组容器`

`28`	`float` `textSize = a.getDimension(R.styleable.myView_textSize,` `30);//防止在XML文件里没有定义，就加上了默认值30`

`29`	`int` `textColor = a.getColor(R.styleable.myView_textColor,` `0xFFFFFFFF);//同上,这里的属性是:名字_属性名`

`30`	`myPaint.setTextSize(textSize);`

`31`	`myPaint.setColor(textColor);`

`32`	`a.recycle();//我的理解是：返回以前取回的属性，供以后使用。以前取回的可能就是textSize和textColor初始化的那段`

33 }

`34`	`@Override`

`35`	`protected` `void` `onDraw(Canvas canvas) {`

`36`	`// TODO Auto-generated method stub`

`37`	`super.onDraw(canvas);`

`38`	`//myPaint = new Paint();`

`39`	`myPaint.setColor(Color.RED);`

`40`	`myPaint.setStyle(Style.FILL);`

41

`42`	`canvas.drawRect(new` `Rect(10,10,100,100), myPaint);`

`43`	`myPaint.setColor(Color.WHITE);`

`44`	`canvas.drawText(myString,` `10,` `100, myPaint);`

45 }

46

47 }

2. [代码]attrs.xml

 1<?xml version="1.0" encoding="utf-8"?>  
 
 2<resources>  
 
 3    <declare-styleable name="myView">  
 
 4        <attr name="textColor" format="color"/>  
 
 5        <attr name="textSize" format="dimension"/>  
 
 6    </declare-styleable>  
 
 7</resources>

3. [代码]main.xml

 01<?xml version="1.0" encoding="utf-8"?>  
 
 02<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 
 03    xmlns:test="http://schemas.android.com/apk/res/com.adnroid.test" 
 
 04    android:orientation="vertical" 
 
 05    android:layout_width="fill_parent" 
 
 06    android:layout_height="fill_parent" 
 
 07    >   
 
 08<TextView   
 
 09    android:layout_width="fill_parent"  
 
 10    android:layout_height="wrap_content"  
 
 11    android:text="@string/hello" 
 
 12    />   
 
 13<com.adnroid.test.MyView 
 
 14    android:layout_width="fill_parent" 
 
 15    android:layout_height="fill_parent" 
 
 16    test:textSize="10px" 
 
 17    test:textColor="#fff" 
 
 18    />   
 
 19</LinearLayout>