Android带圆形进度条的ImageView

本文介绍了一个自定义的ProgressImageView组件,该组件继承自ImageView并实现了圆形进度显示功能。文章详细解释了如何通过重写onDraw()方法来绘制圆形进度条及其进度文字,并提供了设置进度值的方法。

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1.继承ImageView,重写onDraw()方法

2.在控件的中间位置画圆圈进度和进度文字

3.暴露设置进度值的方法,重绘

public class ProgressImageView extends AppCompatImageView {
    private int progress = 0;//加载的进度
    private int diameter = 100;//圆形进度条的直径
    private Paint mPaint;

    public ProgressImageView(Context context) {
        super(context);
        init();
    }

    public ProgressImageView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public ProgressImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        mPaint = new Paint();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        if (progress > 0 && progress < 360) {//如果图片加载完成,进度条不显示
            /**
             * 画进度圆圈,圆圈位置放在图片中间
             */
            mPaint.setAntiAlias(true);//取消锯齿
            mPaint.setStrokeWidth(10);//画笔宽度
            mPaint.setColor(Color.BLUE);//圆圈设置成蓝色
            mPaint.setStyle(Paint.Style.STROKE);//空心
            int ho = (getMeasuredWidth() - diameter) / 2;//水平
            int ve = (getMeasuredHeight() - diameter) / 2;//垂直
            RectF rectF = new RectF();
            rectF.left = ho;
            rectF.top = ve;
            rectF.right = ho + diameter;
            rectF.bottom = ve + diameter;
            canvas.drawArc(rectF, -90, progress, false, mPaint);

            /**
             * 画进度文字显示,位置在图片中间向左编译30px,向下移动10px
             */
            mPaint.setColor(Color.RED);//文字设置成红色
            mPaint.setStrokeWidth(1);//画笔宽度
            mPaint.setTextSize(25);//字体大小
            canvas.drawText(String.valueOf((int) (progress / 3.6)) + "%", getMeasuredWidth() / 2 - 30, getMeasuredHeight() / 2 + 10, mPaint);
        }
    }

    /**
     * 设置进度
     *
     * @param total    总的长度
     * @param progress 已加载的进度
     */
    public void setProgress(int total, int progress) {
        this.progress = progress * 360 / total;
        postInvalidate();
    }
}


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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