Android 自定义漂亮的圆形进度条

公司有这样一个需求，实现这个圆弧进度条

所以，现在就将它抽取出来分享

• 如果需要是圆帽的就将，下面这句代码放开即可 
  
  • mRingPaint.setStrokeCap(Paint.Cap.ROUND);//设置线冒样式，有圆 有方

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不废话，直接上代码

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• 自定义view

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

/**
 * Created by Administrator on 2017/8/5.
 */

public class CompletedView extends View {

    // 画实心圆的画笔
    private Paint mCirclePaint;
    // 画圆环的画笔
    private Paint mRingPaint;
    // 画圆环的画笔背景色
    private Paint mRingPaintBg;
    // 画字体的画笔
    private Paint mTextPaint;
    // 圆形颜色
    private int mCircleColor;
    // 圆环颜色
    private int mRingColor;
    // 圆环背景颜色
    private int mRingBgColor;
    // 半径
    private float mRadius;
    // 圆环半径
    private float mRingRadius;
    // 圆环宽度
    private float mStrokeWidth;
    // 圆心x坐标
    private int mXCenter;
    // 圆心y坐标
    private int mYCenter;
    // 字的长度
    private float mTxtWidth;
    // 字的高度
    private float mTxtHeight;
    // 总进度
    private int mTotalProgress = 100;
    // 当前进度
    private int mProgress;

    public CompletedView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // 获取自定义的属性
        initAttrs(context, attrs);
        initVariable();
    }

    //属性
    private void initAttrs(Context context, AttributeSet attrs) {
        TypedArray typeArray = context.getTheme().obtainStyledAttributes(attrs,
                R.styleable.TasksCompletedView, 0, 0);
        mRadius = typeArray.getDimension(R.styleable.TasksCompletedView_radius, 80);
        mStrokeWidth = typeArray.getDimension(R.styleable.TasksCompletedView_strokeWidth, 10);
        mCircleColor = typeArray.getColor(R.styleable.TasksCompletedView_circleColor, 0xFFFFFFFF);
        mRingColor = typeArray.getColor(R.styleable.TasksCompletedView_ringColor, 0xFFFFFFFF);
        mRingBgColor = typeArray.getColor(R.styleable.TasksCompletedView_ringBgColor, 0xFFFFFFFF);

        mRingRadius = mRadius + mStrokeWidth / 2;
    }

    //初始化画笔
    private void initVariable() {
        //内圆
        mCirclePaint = new Paint();
        mCirclePaint.setAntiAlias(true);
        mCirclePaint.setColor(mCircleColor);
        mCirclePaint.setStyle(Paint.Style.FILL);

        //外圆弧背景
        mRingPaintBg = new Paint();
        mRingPaintBg.setAntiAlias(true);
        mRingPaintBg.setColor(mRingBgColor);
        mRingPaintBg.setStyle(Paint.Style.STROKE);
        mRingPaintBg.setStrokeWidth(mStrokeWidth);


        //外圆弧
        mRingPaint = new Paint();
        mRingPaint.setAntiAlias(true);
        mRingPaint.setColor(mRingColor);
        mRingPaint.setStyle(Paint.Style.STROKE);
        mRingPaint.setStrokeWidth(mStrokeWidth);
        //mRingPaint.setStrokeCap(Paint.Cap.ROUND);//设置线冒样式，有圆 有方

        //中间字
        mTextPaint = new Paint();
        mTextPaint.setAntiAlias(true);
        mTextPaint.setStyle(Paint.Style.FILL);
        mTextPaint.setColor(mRingColor);
        mTextPaint.setTextSize(mRadius / 2);

        Paint.FontMetrics fm = mTextPaint.getFontMetrics();
        mTxtHeight = (int) Math.ceil(fm.descent - fm.ascent);
    }

    //画图
    @Override
    protected void onDraw(Canvas canvas) {
        mXCenter = getWidth() / 2;
        mYCenter = getHeight() / 2;

        //内圆
        canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint);

        //外圆弧背景
        RectF oval1 = new RectF();
        oval1.left = (mXCenter - mRingRadius);
        oval1.top = (mYCenter - mRingRadius);
        oval1.right = mRingRadius * 2 + (mXCenter - mRingRadius);
        oval1.bottom = mRingRadius * 2 + (mYCenter - mRingRadius);
        canvas.drawArc(oval1, 0, 360, false, mRingPaintBg); //圆弧所在的椭圆对象、圆弧的起始角度、圆弧的角度、是否显示半径连线

        //外圆弧
        if (mProgress > 0 ) {
            RectF oval = new RectF();
            oval.left = (mXCenter - mRingRadius);
            oval.top = (mYCenter - mRingRadius);
            oval.right = mRingRadius * 2 + (mXCenter - mRingRadius);
            oval.bottom = mRingRadius * 2 + (mYCenter - mRingRadius);
            canvas.drawArc(oval, -90, ((float)mProgress / mTotalProgress) * 360, false, mRingPaint); //

            //字体
            String txt = mProgress + "分";
            mTxtWidth = mTextPaint.measureText(txt, 0, txt.length());
            canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4, mTextPaint);
        }
    }

    //设置进度
    public void setProgress(int progress) {
        mProgress = progress;
        postInvalidate();//重绘
    }
}

---

• attrs.xml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <!--圆弧进度条-->
    <declare-styleable name="TasksCompletedView">
        <attr name="radius" format="dimension"/>
        <attr name="strokeWidth" format="dimension"/>
        <attr name="circleColor" format="color"/>
        <attr name="ringColor" format="color"/>
        <attr name="ringBgColor" format="color"/>
    </declare-styleable>

</resources>

---

• color.xml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>

    <color name="white">#FFFFFF</color>
    <color name="white2">#f5f3f3</color>
    <color name="colorRed">#d50f09</color>
</resources>

• MainActivity文件！，，，注意，，，开一个子线程去刷新进度，如果用系统handler去更新，阻塞主线程会出现界面刷新的卡顿情况，因为handler就是程操作主线程的

public class MainActivity extends AppCompatActivity {
    private int mTotalProgress = 90;
    private int mCurrentProgress = 0;
    //进度条
    private CompletedView mTasksView;

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

        mTasksView = (CompletedView) findViewById(R.id.tasks_view);

        new Thread(new ProgressRunable()).start();
    }

    class ProgressRunable implements Runnable {
        @Override
        public void run() {
                while (mCurrentProgress < mTotalProgress) {
                    mCurrentProgress += 1;
                    mTasksView.setProgress(mCurrentProgress);
                    try {
                        Thread.sleep(90);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
        }
    }
}

• activity_main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tc="http://schemas.android.com/apk/res/com.example.administrator.arcprogresbar"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#addafd"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:orientation="vertical">
        <com.example.administrator.arcprogresbar.CompletedView
            android:id="@+id/tasks_view"
            android:layout_width="223dp"
            android:layout_height="223dp"
            tc:circleColor="@color/white"
            tc:radius="50dip"
            tc:ringBgColor="@color/white2"
            tc:ringColor="@color/colorRed"
            tc:strokeWidth="10dip" />
    </LinearLayout>
</LinearLayout>

布局文件中后面自定义命名空间接着的是应用的包名：xmlns:tc=”http://schemas.android.com/apk/res/com.example.administrator.arcprogresbar”

• 注意：xmlns:tc=”http://schemas.android.com/apk/res/包名”

• 再次提醒：刷新进度条要用子线程去执行，防止主线程出现卡顿情况

• 源码下载：http://download.csdn.net/detail/qq_32519693/9922309