Android自定义圆形进度条

首先看一下效果：

自定义的View:

import com.example.circlepregress.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.RectF;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

public class RoundProgressBar extends View {

    // 画笔对象的引用
    private Paint paint;

    // 圆环的颜色
    private int roundColor;

    // 圆环进度的颜色
    private int roundProgressColor;

    // 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;

    // 圆环的宽度
    private float roundWidth;

    // 最大进度
    private int max;

    // 当前进度
    private int progress;

    // 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;

    /**
     * 构造方法
     */
    public RoundProgressBar(Context context) {
        this(context, null);
    }

    public RoundProgressBar(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public RoundProgressBar(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        paint = new Paint();

        TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
                R.styleable.RoundProgressBar);

        // 获取自定义属性和默认值
        roundColor = mTypedArray.getColor(
                R.styleable.RoundProgressBar_roundColor, Color.RED);
        roundProgressColor = mTypedArray.getColor(
                R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
        textColor = mTypedArray.getColor(
                R.styleable.RoundProgressBar_textColor, Color.GREEN);
        textSize = mTypedArray.getDimension(
                R.styleable.RoundProgressBar_textSize, 15);
        roundWidth = mTypedArray.getDimension(
                R.styleable.RoundProgressBar_roundWidth, 5);
        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();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        // 画最外层的大圆环
        int centre = getWidth() / 2; // 获取圆心的x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.setStrokeWidth(roundWidth); // 设置圆环的宽度
        paint.setAntiAlias(true); // 消除锯齿
        canvas.drawCircle(centre, centre, radius, paint); // 画出圆环

        Log.e("log", centre + "");

        /**
         * 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); // 中间的进度百分比，先转换成float在进行除法运算，不然都为0
        float textWidth = paint.measureText(percent + "%"); // 测量字体宽度，我们需要根据字体的宽度设置在圆环中间

        if (textIsDisplayable && percent != 0 && style == STROKE) {
            canvas.drawText(percent + "%", centre - textWidth / 2, centre
                    + textSize / 2, paint); // 画出进度百分比
        }

        /**
         * 画圆弧 ，画圆环的进度
         */

        // 设置进度是实心还是空心
        paint.setStrokeWidth(roundWidth); // 设置圆环的宽度
        paint.setColor(roundProgressColor); // 设置进度的颜色
        RectF oval = new RectF(centre - radius, centre - radius, centre
                + radius, centre + radius); // 用于定义的圆弧的形状和大小的界限

        switch (style) {
        case STROKE: {
            paint.setStyle(Paint.Style.STROKE);
            canvas.drawArc(oval, 0, 360 * progress / max, false, paint); // 根据进度画圆弧
            break;
        }
        case FILL: {
            paint.setStyle(Paint.Style.FILL_AND_STROKE);
            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();
        }

    }

    /******************** 下边是属性的get、set方法 ***************/
    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;
    }

}

所需要的资源文件：attrs.xml

<?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>

布局文件如下：

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

    <com.example.roundprogressbar.RoundProgressBar
        android:id="@+id/roundProgressBar2"
        android:layout_width="80dip"
        android:layout_height="80dip"
        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:roundWidth="10dip"
        android_custom:textColor="#9A32CD"
        android_custom:textSize="18sp" />

    <com.example.roundprogressbar.RoundProgressBar
        android:id="@+id/roundProgressBar4"
        android_custom:style="FILL"
        android:layout_width="80dip"
        android:layout_height="80dip"
        android:layout_alignParentRight="true"
        android:layout_alignTop="@+id/roundProgressBar1"
        android:layout_marginRight="32dp"
        android_custom:roundProgressColor="#C2C2C2"
        android_custom:roundWidth="1dip" />

    <com.example.roundprogressbar.RoundProgressBar
        android:id="@+id/roundProgressBar3"
        android:layout_width="80dip"
        android:layout_height="80dip"
        android:layout_alignLeft="@+id/roundProgressBar4"
        android:layout_alignTop="@+id/roundProgressBar2"
        android_custom:roundColor="#C6E2FF"
        android_custom:roundProgressColor="#CD3333"
        android_custom:roundWidth="10dip"
        android_custom:textIsDisplayable="false" />

    <com.example.roundprogressbar.RoundProgressBar
        android:id="@+id/roundProgressBar5"
        android:layout_width="50dip"
        android:layout_height="50dip"
        android:layout_below="@+id/roundProgressBar1"
        android:layout_marginLeft="22dp"
        android:layout_toRightOf="@+id/roundProgressBar1" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:text="Button" />

    <com.example.roundprogressbar.RoundProgressBar
        android:id="@+id/roundProgressBar1"
        android:layout_width="80dip"
        android:layout_height="80dip"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/button1"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="40dp" />

</RelativeLayout>

其中我们使用了这一句：

xmlns:android_custom="http://schemas.android.com/apk/res/com.example.circlepregress"

xmlns:android_custom是我们自己定义的标签，res/com.example.circlepregress其中res/后边的就是我们自定义View所在的目录

MainActivity.java如下：

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

import com.example.circlepregress.R;

public class MainActivity extends Activity {
    private RoundProgressBar mRoundProgressBar1, mRoundProgressBar2 ,mRoundProgressBar3, mRoundProgressBar4, mRoundProgressBar5;
    private int progress = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_cricle_progress);

        mRoundProgressBar1 = (RoundProgressBar) findViewById(R.id.roundProgressBar1);
        mRoundProgressBar2 = (RoundProgressBar) findViewById(R.id.roundProgressBar2);
        mRoundProgressBar3 = (RoundProgressBar) findViewById(R.id.roundProgressBar3);
        mRoundProgressBar4 = (RoundProgressBar) findViewById(R.id.roundProgressBar4);
        mRoundProgressBar5 = (RoundProgressBar) findViewById(R.id.roundProgressBar5);

        ((Button)findViewById(R.id.button1)).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                new Thread(new Runnable() {

                    @Override
                    public void run() {
                        while(progress <= 100){
                            progress += 3;

                            System.out.println(progress);

                            mRoundProgressBar1.setProgress(progress);
                            mRoundProgressBar2.setProgress(progress);
                            mRoundProgressBar3.setProgress(progress);
                            mRoundProgressBar4.setProgress(progress);
                            mRoundProgressBar5.setProgress(progress);

                            try {
                                Thread.sleep(100);
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                        }

                    }
                }).start();
            }
        });

    }


}

项目免费下载地址：http://download.csdn.net/detail/u010870518/8620359