【安卓笔记】带自定义属性的view控件

1.编写attrs属性文件。android在默认情况下并没有attrs.xml,我们需要手动在values目录下新建一个这样的文件。文件根结点是resources，子节点叫declare-styleable,比如下面就是一个attrs文件：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="myview">
        <attr name="radius" format="integer"></attr>
        <attr name="color" format="color"></attr>
    </declare-styleable>
</resources>

package com.example.attributedemo;
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.util.AttributeSet;
import android.view.View;
public class MyView extends View
{
	private Paint mPaint = null;
	
	/**
	 * 圆颜色
	 */
	private int mColor;
	/**
	 * 圆半径
	 */
	private int mRadius;
	
	/**
	 * 默认颜色
	 */
	private static final int DEFAULT_COLOR = Color.RED;
	/**
	 * 默认半径
	 */
	private static final int DEFAULT_RADIUS = 50;
	
	public MyView(Context context)
	{
		super(context);
		mColor = DEFAULT_COLOR;
		mRadius = DEFAULT_RADIUS;
		init();
	}
	public MyView(Context context, AttributeSet attrs)
	{
		super(context, attrs, 0);
		getConfig(context, attrs);
		init();
	}
	/**
	 * 初始化画笔
	 */
	private void init()
	{
		mPaint = new Paint();
		mPaint.setStrokeWidth(1);
		mPaint.setStyle(Style.FILL);
		
		mPaint.setColor(mColor);
	}
	
	/**
	 * 从xml中获取配置信息
	 */
	private void getConfig(Context context,AttributeSet attrs)
	{
		//TypedArray是一个数组容器用于存放属性值
		TypedArray ta = context.obtainStyledAttributes(attrs,R.styleable.myview);
		
		mRadius = ta.getInt(R.styleable.myview_radius, DEFAULT_RADIUS);
		mColor = ta.getColor(R.styleable.myview_color, DEFAULT_COLOR);
		//用完务必回收容器
		ta.recycle();
	}
	
	@Override
	protected void onDraw(Canvas canvas)
	{
		//画一个圆
		canvas.drawCircle(mRadius, mRadius, mRadius, mPaint);
	}
}

RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:myview="http://schemas.android.com/apk/res/com.example.attributedemo"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <com.example.attributedemo.MyView
        android:layout_width="200dp"
        android:layout_height="200dp"
        myview:radius="40"
        myview:color="#bc9300" />
</RelativeLayout>

【安卓笔记】带自定义属性的view控件,布布扣,bubuko.com

【安卓笔记】带自定义属性的view控件

原文：http://blog.csdn.net/chdjj/article/details/38417893