自定义View实现圆形进度条

     自定义实现圆形进度条，首先你需要在value目录下新建attrs.xml属性文件:

<?xml version="1.0" encoding="UTF-8"?>
<resources> 
    <declare-styleable name="RoundProgressBar">  
        <attr name="roundColor" format="color"/>
        <attr name="roundProgressColor" format="color"/>
        <attr name="roundWidth" format="dimension"></attr>
        <attr name="textColor" format="color" />  
        <attr name="textSize" format="dimension" /> 
        <attr name="max" format="integer"></attr> 
        <attr name="textIsDisplayable" format="boolean"></attr>
        <attr name="style">
            <enum name="STROKE" value="0"></enum>
            <enum name="FILL" value="1"></enum>
        </attr>
    </declare-styleable> 
</resources>

这是attrs的属性对应，format的值有string,integer,color.dimension,boolean等等。

然后在自定义的view类中获取这些属性:

//从values/attrs.xml加载属性
TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgressBar);
		
//获取各个属性的值
roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);
roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5);
textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN);
textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15);
max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 100);
textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true);
style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0);
		
mTypedArray.recycle();//为了保持以后使用该属性一致性

要实现自定义圆形进度条，最后需要在重写onDraw()方法，在里面可以设置空心，或者实心，颜色，字体大小等等。

给出示例代码;

package com.example.cirprogresstdw;


import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.View;

public class RoundProgressBar extends View{

	/**
	 * 圆环的颜色
	 */
	private int roundColor;
	
	/**
	 * 圆环进度的颜色
	 */
	private int roundProgressColor;
	/**
	 * 圆环的宽度
	 */
	private float roundWidth;
	/**
	 * 中间进度百分比的字符串的颜色
	 */
	private int textColor;
	/**
	 * 中间进度百分比的字符串的字体
	 */
	private float textSize;
	/**
	 * 最大进度
	 */
	private int max;
	/**
	 * 是否显示中间的进度
	 */
	private boolean textIsDisplayable;
	/**
	 * 进度的风格，实心或者空心
	 */
	private int style;
	public static final int STROKE = 0;
	public static final int FILL = 1;
	
	/**
	 * 当前进度
	 */
	private int progress;
	/**
	 * 画笔对象的引用
	 */
	private Paint paint;
	
	//**构造函数
	public RoundProgressBar(Context context) {
		this(context, null);
	}

	public RoundProgressBar(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}
	
	public RoundProgressBar(Context context, AttributeSet attrs,int defStyleAttr) {
		super(context, attrs, defStyleAttr);
		
		paint = new Paint();
		//从values/attrs.xml加载属性
		TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgressBar);
		
		//获取各个属性的值
		roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);
		roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
		roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5);
		textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN);
		textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15);
		max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 100);
		textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true);
		style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0);
		
		mTypedArray.recycle();//为了保持以后使用该属性一致性
	}
	
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		
		/**
		 * 画最外层的圆环
		 */
		
		int centre = getWidth()/2;//获得圆心的坐标
		int radius = (int) (centre - roundWidth/2);//圆环的半径
		paint.setColor(roundColor);//设置圆环的颜色
		paint.setStyle(Paint.Style.STROKE);//设置空心
	//	paint.setStyle(Paint.Style.FILL);//设置实心
		paint.setStrokeWidth(roundWidth);//设置圆环的宽度
		paint.setAntiAlias(true);//消除锯齿
		canvas.drawCircle(centre, centre, radius, paint);
		
		/**
		 * 画进度百分比
		 */
		paint.setStrokeWidth(0);
		paint.setColor(textColor);
		paint.setTextSize(textSize);
		paint.setTypeface(Typeface.DEFAULT_BOLD);//设置字体
		int percent = (int) (((float)progress/(float)max)*100);//必须先全转化为float型，不然全为0
		float textWidth = paint.measureText(percent+"%");//测量字体的大小,让其在圆心处显示
		if(textIsDisplayable && percent != 0 && style == STROKE){
			canvas.drawText(percent+"%", centre - textWidth/2, centre + textWidth/2, paint);
		}
		
		/**
		 * 画圆弧 ，画圆环的进度
		 */
		paint.setStrokeWidth(roundWidth);//设置圆环的宽度
		paint.setColor(roundProgressColor);//设置圆弧的进度颜色
		RectF oval = new RectF(centre - radius, centre - radius, centre + radius, centre + radius);//画圆弧
		
		switch (style) {
		case STROKE://空心
			paint.setStyle(Paint.Style.STROKE);
			canvas.drawArc(oval, 0, 360 * progress/max, false, paint);//根据进度画圆弧
			break;
			
		case FILL://实心
			paint.setStyle(Paint.Style.FILL);
			if(progress != 0){
				canvas.drawArc(oval, 0, 360 * progress/max, true, paint);//根据进度画圆弧
			}
			break;
		}
	}
	
	public synchronized int getMax() {
		return max;
	}

	/**
	 * 设置进度的最大值
	 * @param max
	 */
	public synchronized void setMax(int max) {
		if(max < 0){
			throw new IllegalArgumentException("max not less than 0");
		}
		this.max = max;
	}

	/**
	 * 获取进度.需要同步
	 * @return
	 */
	public synchronized int getProgress() {
		return progress;
	}

	/**
	 * 设置进度，此为线程安全控件，由于考虑多线的问题，需要同步
	 * 刷新界面调用postInvalidate()能在非UI线程刷新
	 * @param progress
	 */
	public synchronized void setProgress(int progress) {
		if(progress < 0){
			throw new IllegalArgumentException("progress not less than 0");
		}
		if(progress > max){
			progress = max;
		}
		if(progress <= max){
			this.progress = progress;
			postInvalidate();
		}
		
	}
	
	
	public int getCricleColor() {
		return roundColor;
	}

	public void setCricleColor(int cricleColor) {
		this.roundColor = cricleColor;
	}

	public int getCricleProgressColor() {
		return roundProgressColor;
	}

	public void setCricleProgressColor(int cricleProgressColor) {
		this.roundProgressColor = cricleProgressColor;
	}

	public int getTextColor() {
		return textColor;
	}

	public void setTextColor(int textColor) {
		this.textColor = textColor;
	}

	public float getTextSize() {
		return textSize;
	}

	public void setTextSize(float textSize) {
		this.textSize = textSize;
	}

	public float getRoundWidth() {
		return roundWidth;
	}

	public void setRoundWidth(float roundWidth) {
		this.roundWidth = roundWidth;
	}
}

这里需要注意的是进度条的实现，在setProgress(int progress)方法中是进行互斥使用的，因为在布局文件中添加的不止一个圆形进度条，所以需要互斥使用。接下来给出布局文件:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:android_custom="http://schemas.android.com/apk/res/com.example.cirprogresstdw"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <Button 
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        />
    
    <com.example.cirprogresstdw.RoundProgressBar 
        android:id="@+id/roundProgressBar1"
        android:layout_below="@+id/button"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="60dp"
        />
    
    <com.example.cirprogresstdw.RoundProgressBar 
        android:id="@+id/roundProgressBar2"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_alignLeft="@+id/roundProgressBar1"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="78dp"
        
        android_custom:roundColor="#D1D1D1"
        android_custom:roundProgressColor="@android:color/black"
        android_custom:textColor="#9A32CD"
        android_custom:roundWidth="10dip"
        android_custom:textSize="18sp"
        />
    

    <com.example.cirprogresstdw.RoundProgressBar 
        android:id="@+id/roundProgressBar3"
        android:layout_alignParentRight="true"
        android:layout_alignTop="@+id/roundProgressBar1"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_marginRight="38dp"
        
        android_custom:style="FILL"
        android_custom:roundWidth="1dip"
        android_custom:roundProgressColor="#C2C2C2"
        />
    
    <com.example.cirprogresstdw.RoundProgressBar 
        android:id="@+id/roundProgressBar4"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_alignTop="@+id/roundProgressBar2"
        android:layout_alignLeft="@+id/roundProgressBar3"
        
        android_custom:roundColor="#C6E2FF"
        android_custom:roundWidth="10dip"
        android_custom:roundProgressColor="#CD3333"
        android_custom:textIsDisplayable="false"
        />
    
    <com.example.cirprogresstdw.RoundProgressBar 
        android:id="@+id/roundProgressBar5"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_below="@+id/roundProgressBar1"
        android:layout_toRightOf="@+id/roundProgressBar1"
        android:layout_marginLeft="30dp"
        />
</RelativeLayout>

在布局文件中xmlns:android_custom="http://schemas.android.com/apk/res/com.example.cirprogresstdw"这个是自己定义空间，记得必须添加，...res/+清单文件下你的包名

实现自定义空间后，就可以在下面使用这个名字设置相应的属性。

这里给出了五个圆形进度条。

接下里给出主功能代码:

package com.example.cirprogresstdw;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

	private Button button;
	private RoundProgressBar roundProgressBar1;
	private RoundProgressBar roundProgressBar2;
	private RoundProgressBar roundProgressBar3;
	private RoundProgressBar roundProgressBar4;
	private RoundProgressBar roundProgressBar5;
	private int progress = 0;
	
	
	Handler handler = new Handler(){
		@Override
		public void handleMessage(android.os.Message msg) {
			roundProgressBar1.setProgress(Integer.valueOf(msg.obj.toString()));
			roundProgressBar2.setProgress(Integer.valueOf(msg.obj.toString()));
			roundProgressBar3.setProgress(Integer.valueOf(msg.obj.toString()));
			roundProgressBar4.setProgress(Integer.valueOf(msg.obj.toString()));
			roundProgressBar5.setProgress(Integer.valueOf(msg.obj.toString()));
		};
	};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		roundProgressBar1 = (RoundProgressBar) findViewById(R.id.roundProgressBar1);
		roundProgressBar2 = (RoundProgressBar) findViewById(R.id.roundProgressBar2);
		roundProgressBar3 = (RoundProgressBar) findViewById(R.id.roundProgressBar3);
		roundProgressBar4 = (RoundProgressBar) findViewById(R.id.roundProgressBar4);
		roundProgressBar5 = (RoundProgressBar) findViewById(R.id.roundProgressBar5);
		
		button = (Button) findViewById(R.id.button);
		button.setOnClickListener(new OnClickListener());
	}
	
	private final class OnClickListener implements android.view.View.OnClickListener{

		@Override
		public void onClick(View v) {
			
			new Thread(){
				@Override
				public void run() {
					while(true){
						progress = progress + 3;
						handler.sendMessage(handler.obtainMessage(10, progress));
						if(progress >= 100){
							break;
						}
						try {
							Thread.sleep(1000);
						} catch (InterruptedException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
				};
			}.start();;
		}
	}
}

代码已经全部贴出。

完整代码:http://download.csdn.net/detail/tan313/8598753