自定义组件属性定义获取

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <!--定义名字叫MyAttributeView属性集合-->
    <declare-styleable name="MyAttributeView">
        <!--定义一个名字叫my_name并且类型是string的属性-->
        <attr name="my_name" format="string"/>
        <!--定义一个名字叫my_age并且类型是integer的属性-->
        <attr name="my_age" format="integer"/>
        <!--定义一个名字叫my_bg并且类型是reference|color的属性-->
        <attr name="my_bg" format="reference|color"/>

    </declare-styleable>
</resources>


public class MyAttributeView extends View {
    private int myAge;
    private String myName;
    private Bitmap myBg;

    public MyAttributeView(Context context, AttributeSet attrs) {
        super(context, attrs);

       //获取属性三种方式
        //1.用命名空间取获取
        String age = attrs.getAttributeValue("http://schemas.android.com/apk/res-auto","my_age");
        String name = attrs.getAttributeValue("http://schemas.android.com/apk/res-auto","my_name");
        String  bg = attrs.getAttributeValue("http://schemas.android.com/apk/res-auto","my_bg");
//        System.out.println("age=="+age+",name=="+name+",bg==="+bg);

        //2.遍历属性集合
        for(int i=0;i<attrs.getAttributeCount();i++){
            System.out.println(attrs.getAttributeName(i)+"====="+attrs.getAttributeValue(i));
        }

        //3.使用系统工具，获取属性
        TypedArray typedArray = context.obtainStyledAttributes(attrs,R.styleable.MyAttributeView);
       for(int i=0;i<typedArray.getIndexCount();i++){
          int index =  typedArray.getIndex(i);

           switch (index){
               case R.styleable.MyAttributeView_my_age:
                   myAge = typedArray.getInt(index,0);
                   break;
               case R.styleable.MyAttributeView_my_name:
                   myName = typedArray.getString(index);
                   break;
               case R.styleable.MyAttributeView_my_bg:
                   Drawable drawable = typedArray.getDrawable(index);
                   BitmapDrawable drawable1 = (BitmapDrawable) drawable;
                   myBg = drawable1.getBitmap();
                   break;
           }
       }

        // 记得回收
        typedArray.recycle();


    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint paint = new Paint();
        canvas.drawText(myName+"---"+myAge,50,50,paint);
        canvas.drawBitmap(myBg,50,50,paint);
    }
}

最后

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