【Android】自定义圆形进度条效果（有进度标识点）

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; } }