Android环形进度条

分享一个环形进度条供大家参考，项目地址

https://download.csdn.net/download/weixin_40998254/10595267

效果如图

image

下面是该自定义进度条的代码，目前属于简陋版本，不过注释很详细，方便扩展。

首先是自定View的代码

/**
 * 作者：GJP on 2018/7/26 15:12
 * 邮箱：[email protected]
 * 描述：
 */

public class CircularProgressView extends View {

    private Context mContext;
    private Paint mPaint;
    private int mProgress = 0;
    private static int MAX_PROGRESS = 100;
    /** * 弧度 */
    private int mAngle;
    /** * 中间的文字 */
    private String mText;
    /** * 外圆颜色 */
    private int outRoundColor;
    /** * 内圆的颜色 */
    private int inRoundColor;
    /** * 线的宽度 */
    private int roundWidth;
    private int style;
    /*** 字体颜色*/
    private int textColor;
    /** * 字体大小 */
    private float textSize;
    /** * 字体是否加粗 */
    private boolean isBold;
    /** * 进度条颜色 */
    private int progressBarColor;

    public CircularProgressView(Context context) {
        this(context, null);
    }
    public CircularProgressView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public CircularProgressView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr);
        mContext = context;
        init(attrs);
    }

    @TargetApi(21)
    public CircularProgressView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        mContext = context;
        init(attrs);
    }

    /**
     * 解析自定义属性
     * @param attrs
     */
    public void init(AttributeSet attrs) {
        mPaint = new Paint();
        TypedArray typedArray = mContext.obtainStyledAttributes(attrs, R.styleable.CircleProgressBar);
        outRoundColor = typedArray.getColor(R.styleable.CircleProgressBar_outCircleColor, getResources().getColor(R.color.colorPrimary));
        inRoundColor = typedArray.getColor(R.styleable.CircleProgressBar_inCircleColor, getResources().getColor(R.color.colorPrimaryDark));
        progressBarColor = typedArray.getColor(R.styleable.CircleProgressBar_progressColor, getResources().getColor(R.color.colorAccent));
        isBold = typedArray.getBoolean(R.styleable.CircleProgressBar_textBold, false);
        textColor = typedArray.getColor(R.styleable.CircleProgressBar_textColor, Color.BLACK);
        roundWidth = typedArray.getDimensionPixelOffset(R.styleable.CircleProgressBar_lineWidth, 20);
        typedArray.recycle();
    }

    @Override
    protected void onDraw(Canvas canvas) { /** * 画外圆 */
        super.onDraw(canvas);
        int center = getWidth() / 2;//圆心
        int radius = (center - roundWidth / 2);// 半径

        mPaint.setColor(outRoundColor); //外圆颜色
        mPaint.setStrokeWidth(roundWidth); //线的宽度
        mPaint.setStyle(Paint.Style.STROKE); //空心圆
        mPaint.setAntiAlias(true); //消除锯齿
        canvas.drawCircle(center, center, radius, mPaint); //内圆

        mPaint.setColor(inRoundColor);
        radius = radius - roundWidth;
        canvas.drawCircle(center, center, radius, mPaint); //画进度是一个弧线

        mPaint.setColor(progressBarColor);
        RectF rectF = new RectF(center - radius, center - radius, center + radius, center + radius);//圆弧范围的外接矩形
        canvas.drawArc(rectF, -90, mAngle, false, mPaint);

        canvas.save(); //平移画布之前保存之前画的

        // 画进度终点的小球,旋转画布的方式实现
        mPaint.setStyle(Paint.Style.FILL);
        // 将画布坐标原点移动至圆心
        canvas.translate(center, center);
        // 旋转和进度相同的角度,因为进度是从-90度开始的所以-90度
        canvas.rotate(mAngle - 90);
        // 同理从圆心出发直接将原点平移至要画小球的位置
        canvas.translate(radius, 0);
        canvas.drawCircle(0, 0, roundWidth, mPaint);

        // 画完之后恢复画布坐标
        canvas.restore();

        // 画文字将坐标平移至圆心
        canvas.translate(center, center);
        mPaint.setStrokeWidth(0);
        mPaint.setColor(textColor);
        if (isBold) { //字体加粗
            mPaint.setTypeface(Typeface.DEFAULT_BOLD);
        } if (!TextUtils.isEmpty(mText)) {
            // 动态设置文字长为圆半径,计算字体大小
            float textLength = mText.length();
            textSize = radius / textLength;
            mPaint.setTextSize(textSize);
            // 将文字画到中间
            float textWidth = mPaint.measureText(mText);
            canvas.drawText(mText, -textWidth / 2, textSize / 2, mPaint);
        }

    }

    public int getProgress() {
        return mProgress;
    }

    /**
     * 设置进度
     * @return
     */
    public void setProgress(int p) {
        if (p > MAX_PROGRESS) {
            mProgress = MAX_PROGRESS;
            mAngle = 360;
        } else {
            mProgress = p;
            mAngle = 360 * p / MAX_PROGRESS;
        }
        //更新画布
        invalidate();
    }

    public String getText() {
        return mText;
    }

    /**
     * 设置文本
     * @param mText
     */
    public void setText(String mText) {
        this.mText = mText;
        invalidate();
    }

}

styles.xml中需要添加

再布局文件中引用的示例代码

Activity中具体控制进度

public class MainActivity extends AppCompatActivity {

    private CircularProgressView progress_bar;
    @SuppressLint("HandlerLeak")
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            progress_bar.setProgress(msg.what);
            progress_bar.setText(progress_bar.getProgress()+"%");
            addProgress(msg.what);
        }
    };

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

    private void initView() {
        progress_bar = (CircularProgressView) findViewById(R.id.progress_bar);
        progress_bar.setProgress(0);
        progress_bar.setText(progress_bar.getProgress()+"%");
        addProgress(0);
    }

    private void addProgress(int i) {
        if (i>=100){
            i = 0;
        }else {
            ++i;
        }
        handler.sendEmptyMessageDelayed(i, 100);
    }

}

关于这个自定义的环形进度条没什么说的，代码注释很详细，使用方法都粘贴出来了，因为扩展起来很方便所以粘贴出来供大家参考和自己留作记录，如果有时间后续会发一个完善些的圆形进度条到GitHub上。