本文实例讲述了Android编程使用自定义View实现水波进度效果。分享给大家供大家参考,具体如下:
首先上效果图:
简介:1.自动适应屏幕大小;
2.水波自动横向滚动;
3.各种绘制参数可通过修改常量进行控制。代码不多,注释也比较详细,全部贴上:
(一)自定义组件:/** * 水波进度效果. */public class WaterWaveView extends View {//边框宽度private int STROKE_WIDTH;//组件的宽,高private int width, height;/** * 进度条最大值和当前进度值 */private float max, progress;/** * 绘制波浪的画笔 */private Paint progressPaint;//波纹振幅与半径之比。(建议设置:<0.1)private static final float A = 0.05f;//绘制文字的画笔private Paint textPaint;//绘制边框的画笔private Paint circlePaint;/** * 圆弧圆心位置 */private int centerX, centerY;//内圆所在的矩形private RectF circleRectF;public WaterWaveView(Context context) {super(context);init();}public WaterWaveView(Context context, AttributeSet attrs) {super(context, attrs);init();}public WaterWaveView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init();}//初始化private void init() {progressPaint = new Paint();progressPaint.setColor(Color.parseColor("#77cccc88"));progressPaint.setAntiAlias(true);textPaint = new Paint();textPaint.setColor(Color.WHITE);textPaint.setAntiAlias(true);circlePaint = new Paint();circlePaint.setStyle(Paint.Style.STROKE);circlePaint.setAntiAlias(true);circlePaint.setColor(Color.parseColor("#33333333"));autoRefresh();}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);if (width == 0 || height == 0) {width = getWidth();height = getHeight();//计算圆弧半径和圆心点int circleRadius = Math.min(width, height) >> 1;STROKE_WIDTH = circleRadius / 10;circlePaint.setStrokeWidth(STROKE_WIDTH);centerX = width / 2;centerY = height / 2;VALID_RADIUS = circleRadius - STROKE_WIDTH;RADIANS_PER_X = (float) (Math.PI / VALID_RADIUS);circleRectF = new RectF(centerX - VALID_RADIUS, centerY - VALID_RADIUS,centerX + VALID_RADIUS, centerY + VALID_RADIUS);}}private Rect textBounds = new Rect();//x方向偏移量private int xOffset;@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//绘制圆形边框canvas.drawCircle(centerX, centerY, VALID_RADIUS + (STROKE_WIDTH >> 1), circlePaint);//绘制水波曲线canvas.drawPath(getWavePath(xOffset), progressPaint);//绘制文字textPaint.setTextSize(VALID_RADIUS >> 1);String text1 = String.valueOf(progress);//测量文字长度float w1 = textPaint.measureText(text1);//测量文字高度textPaint.getTextBounds("8", 0, 1, textBounds);float h1 = textBounds.height();float extraW = textPaint.measureText("8") / 3;canvas.drawText(text1, centerX - w1 / 2 - extraW, centerY + h1 / 2, textPaint);textPaint.setTextSize(VALID_RADIUS / 6);textPaint.getTextBounds("M", 0, 1, textBounds);float h2 = textBounds.height();canvas.drawText("M", centerX + w1 / 2 - extraW + 5, centerY - (h1 / 2 - h2), textPaint);String text3 = "共" + String.valueOf(max) + "M";float w3 = textPaint.measureText(text3, 0, text3.length());textPaint.getTextBounds("M", 0, 1, textBounds);float h3 = textBounds.height();canvas.drawText(text3, centerX - w3 / 2, centerY + (VALID_RADIUS >> 1) + h3 / 2, textPaint);String text4 = "流量剩余";float w4 = textPaint.measureText(text4, 0, text4.length());textPaint.getTextBounds(text4, 0, text4.length(), textBounds);float h4 = textBounds.height();canvas.drawText(text4, centerX - w4 / 2, centerY - (VALID_RADIUS >> 1) + h4 / 2, textPaint);}//绘制水波的路径private Path wavePath;//每一个像素对应的弧度数private float RADIANS_PER_X;//去除边框后的半径(即内圆半径)private int VALID_RADIUS;/** * 获取水波曲线(包含圆弧部分)的Path. * * @param xOffset x方向像素偏移量. */private Path getWavePath(int xOffset) {if (wavePath == null) {wavePath = new Path();} else {wavePath.reset();}float[] startPoint = new float[2]; //波浪线起点float[] endPoint = new float[2]; //波浪线终点for (int i = 0; i <= VALID_RADIUS * 2; i += 2) {float x = centerX - VALID_RADIUS + i;float y = (float) (centerY + VALID_RADIUS * (1.0f + A) * 2 * (0.5f - progress / max)+ VALID_RADIUS * A * Math.sin((xOffset + i) * RADIANS_PER_X));//只计算内圆内部的点,边框上的忽略if (calDistance(x, y, centerX, centerY) > VALID_RADIUS) {if (x < centerX) {continue; //左边框,继续循环} else {break; //右边框,结束循环}}//第1个点if (wavePath.isEmpty()) {startPoint[0] = x;startPoint[1] = y;wavePath.moveTo(x, y);} else {wavePath.lineTo(x, y);}endPoint[0] = x;endPoint[1] = y;}if (wavePath.isEmpty()) {if (progress / max >= 0.5f) {//满格wavePath.moveTo(centerX, centerY - VALID_RADIUS);wavePath.addCircle(centerX, centerY, VALID_RADIUS, Path.Direction.CW);} else {//空格return wavePath;}} else {//添加圆弧部分float startDegree = calDegreeByPosition(startPoint[0], startPoint[1]); //0~180float endDegree = calDegreeByPosition(endPoint[0], endPoint[1]); //180~360wavePath.arcTo(circleRectF, endDegree - 360, startDegree - (endDegree - 360));}return wavePath;}private float calDistance(float x1, float y1, float x2, float y2) {return (float) Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));}//根据当前位置,计算出进度条已经转过的角度。private float calDegreeByPosition(float currentX, float currentY) {float a1 = (float) (Math.atan(1.0f * (centerX - currentX) / (currentY - centerY)) / Math.PI * 180);if (currentY < centerY) {a1 += 180;} else if (currentY > centerY && currentX > centerX) {a1 += 360;}return a1 + 90;}public void setMax(int max) {this.max = max;invalidate();}//直接设置进度值(同步)public void setProgressSync(float progress) {this.progress = progress;invalidate();}/** * 自动刷新页面,创造水波效果。组件销毁后该线城将自动停止。 */private void autoRefresh() {new Thread(new Runnable() {@Overridepublic void run() {while (!detached) {xOffset += (VALID_RADIUS >> 4);SystemClock.sleep(100);postInvalidate();}}}).start();}//标记View是否已经销毁private boolean detached = false;@Overrideprotected void onDetachedFromWindow() {super.onDetachedFromWindow();detached = true;}}
(二)使用方法:在xml布局中引入上述组件,然后在activity或fragment中设置属性:
WaterWaveView bar = (WaterWaveView) getActivity().findViewById(R.id.water_wave_view);bar.setMax(500);bar.setProgressSync(361.8f);
更多关于Android相关内容感兴趣的读者可查看本站专题:《Android开发动画技巧汇总》、《Android编程之activity操作技巧总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》、《Android开发入门与进阶教程》、《Android资源操作技巧汇总》及《Android控件用法总结》
希望本文所述对大家Android程序设计有所帮助。