转attrs.xml文件的属性解释

转载自：http://www.jb51.cc/article/p-dbjgrucp-qy.html

Android中在values中定义一个attrs.xml，然后自己定义一个组件MyView

attrs.xml内容如下:

[html] view plain copy

1. <?xmlversion="1.0"encoding="utf-8"?>
2. <resources>
3. declare-styleablename="MyView">
4. attrname="textColor"format="color"/>
5. attrname="textSize"format="dimension"/>
6. </declare-styleable>

定义的组件MyView:

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packagecom.jiangwei.demo;

importandroid.content.Context;

importandroid.content.res.TypedArray;

importandroid.graphics.Canvas;

importandroid.graphics.Color;

importandroid.graphics.Paint;

importandroid.graphics.Paint.Style;

importandroid.graphics.Rect;

importandroid.util.AttributeSet;

importandroid.view.View;

publicclassMyViewextendsView{

privatePaintmPaint;

privatestaticfinalStringmString="WelcometoMrWei'sblog";

publicMyView(Contextcontext){

super(context);

mPaint=newPaint();

}

publicMyView(Contextcontext,AttributeSetattrs){

super(context,attrs);

mPaint=newPaint();

TypedArraya=context.obtainStyledAttributes(attrs,R.styleable.MyView);

inttextColor=a.getColor(R.styleable.MyView_textColor,0XFFFFFFFF);

floattextSize=a.getDimension(R.styleable.MyView_textSize,36);

mPaint.setTextSize(textSize);

mPaint.setColor(textColor);

a.recycle();

}

@Override

protectedvoidonDraw(Canvascanvas){

//TODOAuto-generatedmethodstub

super.onDraw(canvas);

//设置填充

mPaint.setStyle(Style.FILL);

//画一个矩形,前俩个是矩形左上角坐标，后面俩个是右下角坐标

canvas.drawRect(newRect(10,10,100,100),mPaint);

mPaint.setColor(Color.BLUE);

//绘制文字

canvas.drawText(mString,110,mPaint);

}