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

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

该实例是在自定义View上使用自定义属性的。

1.MyView.java

    package com.adnroid.test;  
      
    import com.adnroid.test.R;  
      
    import android.content.Context;  
    import android.content.res.TypedArray;  
    import android.graphics.Canvas;  
    import android.graphics.Color;  
    import android.graphics.Paint;  
    import android.graphics.Rect;  
    import android.graphics.Paint.Style;  
    import android.util.AttributeSet;  
    import android.view.View;  
      
    public class MyView extends View {  
        private Paint myPaint;  
        private static final String myString = "Welcome to our Zoon!";  
      
        public MyView(Context context) {  
            super(context);  
            // TODO Auto-generated constructor stub  
         }  
          
        public MyView(Context context, AttributeSet attr) {  
            super(context, attr);  
             myPaint = new Paint();  
             TypedArray a = context.obtainStyledAttributes(attr, R.styleable.myView);//TypedArray是一个数组容器  
            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  
            int textColor = a.getColor(R.styleable.myView_textColor, 0xFFFFFFFF);//同上,这里的属性是:名字_属性名  
             myPaint.setTextSize(textSize);  
             myPaint.setColor(textColor);  
             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  
         }  
        @Override  
        protected void onDraw(Canvas canvas) {  
            // TODO Auto-generated method stub  
            super.onDraw(canvas);  
            //myPaint = new Paint();  
             myPaint.setColor(Color.RED);  
             myPaint.setStyle(Style.FILL);  
              
             canvas.drawRect(new Rect(10,10,100,100), myPaint);  
             myPaint.setColor(Color.WHITE);  
             canvas.drawText(myString, 10, 100, myPaint);  
         }  
      
    }  

2.attrs.xml

    <?xml version="1.0" encoding="utf-8"?>  
    <resources>  
        <declare-styleable name="myView">  
            <attr name="textColor" format="color"/>  
            <attr name="textSize" format="dimension"/>  
        </declare-styleable>  
    </resources>  

3.main.xml

    <?xml version="1.0" encoding="utf-8"?>  
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
        xmlns:test="http://schemas.android.com/apk/res/com.adnroid.test"  
        android:orientation="vertical"  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        >  
    <TextView    
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
        android:text="@string/hello"  
        />  
    <com.adnroid.test.MyView  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        test:textSize="10px"  
        test:textColor="#fff"  
        />  
    </LinearLayout>  

4.[图片] 6c32391db1a8d7cd86d6b6bc.jpg.png