Android自定义圆形进度条

本文介绍了一种使用Android自定义View实现圆形进度条的方法,包括如何通过XML属性设置进度条的颜色、位置、大小等参数,并通过定时任务不断更新进度条的显示。

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布局

    <com.myapplication.Run
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:circle_color="#0000ff"
        app:circle_radius="70dp"
        app:circle_x="200dp"
        app:circle_y="200dp" />

代码

public class Run extends View{
    private float cx;
    private float cy;
    private float radius;
    private Paint paint;
    private int sweepAngle;
    private int color;


    public Run(Context context) {
        this(context, null);
    }


    public Run(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        //获取自定义的属性
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyPb);
        //获取颜色
        color = a.getColor(R.styleable.MyPb_circle_color, Color.BLACK);
        radius = a.getDimension(R.styleable.MyPb_circle_radius, 20);
        cx = a.getDimension(R.styleable.MyPb_circle_x, 100);
        cy = a.getDimension(R.styleable.MyPb_circle_y, 100);
        //需要回收
        a.recycle();


        paint = new Paint();
        paint.setAntiAlias(true);
        paint.setStyle(Paint.Style.STROKE);

        Timer timer = new Timer();
        timer.schedule(new TimerTask() {
                           @Override
                           public void run() {
                               if (sweepAngle > 360) {
                                   return;
                               }
                               sweepAngle += 1;
                               //刷新View
                               //这个方法只能在主线程刷新UI
//                        invalidate();
                               //这个方法,也是刷新UI,并且可以在子线程刷新
                               postInvalidate();


                           }
                       }
                , 1000, 20);
    }
    @Override
    protected void onDraw(Canvas canvas) {
        paint.setColor(color);
        paint.setStrokeWidth(5);
        canvas.drawCircle(cx, cy, radius, paint);


        paint.setColor(Color.RED);
        RectF rectF = new RectF(cx - radius, cy - radius, cx + radius, cy + radius);
        canvas.drawArc(rectF, -90, sweepAngle, false, paint);


        //绘制文字
        int progress = (int) (sweepAngle / 360f * 100);


        paint.setStrokeWidth(0);
        paint.setColor(Color.BLACK);
        paint.setTextSize(35);
        canvas.drawText(progress + "%", cx - 5, cy, paint);
    }


}
总共分为三层:一层为圆形边线,一层为进度边线,一层用来显示标识进度节点。 public class CircleProgressBar extends View { private int maxProgress = 100; private int progress = 15; private int progressStrokeWidth = 2; private int marxArcStorkeWidth = 16; // 画圆所在的距形区域 RectF oval; Paint paint; public CircleProgressBar(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub oval = new RectF(); paint = new Paint(); } @Override protected void onDraw(Canvas canvas) { // TODO 自动生成的方法存根 super.onDraw(canvas); int width = this.getWidth(); int height = this.getHeight(); width = (width > height) ? height : width; height = (width > height) ? height : width; paint.setAntiAlias(true); // 设置画笔为抗锯齿 paint.setColor(Color.WHITE); // 设置画笔颜色 canvas.drawColor(Color.TRANSPARENT); // 白色背景 paint.setStrokeWidth(progressStrokeWidth); // 线宽 paint.setStyle(Style.STROKE); oval.left = marxArcStorkeWidth / 2; // 左上角x oval.top = marxArcStorkeWidth / 2; // 左上角y oval.right = width - marxArcStorkeWidth / 2; // 左下角x oval.bottom = height - marxArcStorkeWidth / 2; // 右下角y canvas.drawArc(oval, -90, 360, false, paint); // 绘制白色圆圈,即进度条背景 paint.setColor(Color.rgb(0x57, 0x87, 0xb6)); paint.setStrokeWidth(marxArcStorkeWidth); canvas.drawArc(oval, -90, ((float) progress / maxProgress) * 360, false, paint); // 绘制进度圆弧,这里是蓝色 paint.setStrokeWidth(1); String text = progress + "%"; int textHeight = height / 4; paint.setTextSize(textHeight); int textWidth = (int) paint.measureText(text, 0, text.length()); paint.setStyle(Style.FILL); canvas.drawText(text, width / 2 - textWidth / 2, height / 2 + textHeight / 2, paint); } public int getMaxProgress() { return maxProgress; } public void setMaxProgress(int maxProgress) { this.maxProgress = maxProgress; } /** * 设置进度 * * @param progress * 进度百分比 * @param view * 标识进度的节点视图 */ public void setProgress(int progress, View view) { this.progress = progress; view.setAnimation(pointRotationAnima(0, (int) (((float) 360 / maxProgress) * progress))); this.invalidate(); } /** * 非UI线程调用 */ public void setProgressNotInUiThread(int progress, View view) { this.progress = progress; view.setAnimation(pointRotationAnima(0, (int) (((float) 360 / maxProgress) * progress))); this.postInvalidate(); } /** * 进度标注点的动画 * * @param fromDegrees * @param toDegrees * @return */ private Animation pointRotationAnima(float fromDegrees, float toDegrees) { int initDegress = 306;// 进度点起始位置(图片偏移约54度) RotateAnimation animation = new RotateAnimation(fromDegrees, initDegress + toDegrees, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); animation.setDuration(1);// 设置动画执行时间 animation.setRepeatCount(1);// 设置重复执行次数 animation.setFillAfter(true);// 设置动画结束后是否停留在结束位置 return animation; } }
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