自定义环形进度条

效果图：

package com.qiao.circleprogress_forexample;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
/**
 * 主页面
 * @author 有点凉了
 *
 */
public class MainActivity extends Activity {
    private RoundProgressBar progressBar1;
    private  int progress = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        progressBar1 = (RoundProgressBar) findViewById(R.id.progressBar1);
        new Thread(new Runnable() {
             
            @Override
            public void run() {
                while (progress<=59) {
                    progress+=1;
                    progressBar1.setProgress(progress);
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

自定义页面

package com.qiao.circleprogress_forexample;
 
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;
 
 
/**
 * 仿iphone带进度的进度条，线程安全的View，可直接在线程中更新进度
 * @author 有点凉了
 *
 */
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;
     
    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.WHITE);
        roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.BLUE);
        textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.BLACK);
        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();
        }
         
    }
     
     
    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;
    }
 
 
 
}

布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <com.qiao.circleprogress_forexample.RoundProgressBar
        android:id="@+id/progressBar1"
        android:layout_width="100dip"
        android:layout_height="100dip"
       />
 
</LinearLayout>

属性

<?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>

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原文地址：https://www.cnblogs.com/dongweiq/p/3989953.html