实现原理

首先就是自定义个WaveView 继承View,然后再WaveView 内部实现代码逻辑：

① 水波就波嘛？ sin函数？ 贝塞尔曲线？ 都行，这里就用二阶贝塞 尔曲线去画吧

② 波要动嘛，怎么动呢？线程？ 好吧 这里用了个Handler。

③绘制波首先要找点，那么在onMeasure()里找出需要的点咯，这里就暂时展示一个波段吧，一个波长移动左边不就没了？OK 那就两个波吧，吼吼，两个波（猥琐男潜质表露无遗啊）。接下来就是Handler 结合 onDraw()绘制。OK，那就先看我Word绘制的粗瘪的波动图，请看VCR，oh，no... gif

意思就是波平移一个波长之后回到初始位置继续平移循环。

好吧，有人说了，这么简单的逻辑你要啰嗦那么多？？？

好吧，我承认，我有唐僧的潜质。。。

闲话就不说了，先上

效果图

示例代码如下

调用的Activity

* Created by LiuDong on 2016/12/22. * Email:15002102128@126.com */public class WaveActivity extends Activity { LD_WaveView waveView;//方形 LD_WaveView waveCircleView;//圆形 private int progrees=0;//进度 private Handler mHandler=new Handler(){ @Override public void handleMessage(Message msg) { if (progrees==100) progrees=0; Log.i("progress",progrees+""); waveView.setmProgress(progrees++); waveCircleView.setmProgress(progrees++); mHandler.sendEmptyMessageDelayed(0,100); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_wave); waveView= (LD_WaveView) findViewById(R.id.waveView); waveCircleView= (LD_WaveView) findViewById(R.id.waveViewCircle); mHandler.sendEmptyMessageDelayed(0,10); }}

xml布局

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:orientation="vertical" android:layout_width="match_parent" android:background="@color/ld_White" android:layout_height="match_parent"> <com.dadong.ld_tools.widget.LD_WaveView android:id="@+id/waveViewCircle" android:layout_marginTop="20dp" android:layout_width="100dp" android:layout_centerHorizontal="true" android:layout_height="100dp" app:wave_color="@color/ld_Black" app:wave_circle="true" /> <com.dadong.ld_tools.widget.LD_WaveView android:id="@+id/waveView" android:layout_width="100dp" android:layout_height="100dp" app:wave_color="@color/ld_Black" app:wave_circle="false" android:layout_centerInParent="true" /></RelativeLayout>

自定义WaveView

/** * Created by LiuDong on 2016/12/23. * Email:15002102128@126.com */public class LD_WaveView extends View { private int mProgress;//进度 private int mTimeStep = 10;//时间间隔 private int mSpeed = 5;//波单次移动的距离 private int mViewHeight;//视图宽高 private int mViewWidth;//视图宽度 private int mLevelLine;// 基准线 private int mWaveLength;//波长 暂定view宽度为一个波长 private int mStrokeWidth;//园的线宽 private RectF rectF;//圆环区域 private int mWaveHeight;//波峰高度 private int mLeftWaveMoveLength;//波平移的距离，用来控制波的起点位置 private int mWaveColor;//波的颜色 private Paint mPaint;//画笔 private Paint mCirclePaint;//圆环画笔 private Paint mBorderPaint;//边界画笔 private int mBorderWidth=4;//边界宽度 private Paint mTextPaint;//文字画笔 private Path mPath;//绘画线 private List<Point> mPoints;//点的集合 private boolean isMeasure = false;//是否已测量过 private boolean isCircle=false;//是否圆形默认false，可属性代码设置 //处理消息 private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { initWaveMove(); } }; /** * 初始化波的移动 */ private void initWaveMove(){ mLeftWaveMoveLength+=mSpeed;//波向右移动距离增加mSpeed; if (mLeftWaveMoveLength>=mWaveLength){//当增加到一个波长时回复到0 mLeftWaveMoveLength=0; } invalidate(); } public LD_WaveView(Context context) { this(context, null); } public LD_WaveView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public LD_WaveView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); getAttr(context, attrs, defStyleAttr); init(); } /** * 初始化画笔 */ private void init() { mPoints = new ArrayList<Point>(); //波浪轨迹画笔 mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setColor(mWaveColor); mPaint.setStyle(Paint.Style.FILL_AND_STROKE); mPath = new Path(); //文字画笔 mTextPaint=new Paint(); mTextPaint.setColor(Color.RED); mTextPaint.setTextAlign(Paint.Align.CENTER); mTextPaint.setTextSize(48); //圆环画笔 mCirclePaint=new Paint(); mCirclePaint.setAntiAlias(true); mCirclePaint.setColor(Color.WHITE); mCirclePaint.setStyle(Paint.Style.STROKE); //边界线画笔 mBorderPaint=new Paint(); mBorderPaint.setAntiAlias(true); mBorderPaint.setColor(mWaveColor); mBorderPaint.setStrokeWidth(mBorderWidth); mBorderPaint.setStyle(Paint.Style.STROKE); } /** * 获取自定义的属性值 * * @param attrs */ private void getAttr(Context context, AttributeSet attrs, int defStyle) { TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.LD_WaveView, defStyle, 0); mWaveColor = a.getColor(R.styleable.LD_WaveView_wave_color, Color.RED); isCircle=a.getBoolean(R.styleable.LD_WaveView_wave_circle,false); a.recycle(); } /** * * @param widthMeasureSpec * @param heightMeasureSpec */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); if (!isMeasure&&Math.abs(getMeasuredHeight()-getMeasuredWidth())<50) {//只计算一次就够了 ，relativelayout的时候要绘制两次 加个宽高判断 mViewHeight = getMeasuredHeight(); mViewWidth = getMeasuredWidth(); mLevelLine = mViewHeight; //初始化波的准位线 起始位视图最底部 { mLevelLine = mViewHeight * (100-mProgress) / 100; if (mLevelLine < 0) mLevelLine = 0; } //计算波峰值 mWaveHeight = mViewHeight / 20;//波峰暂定为view高度的1/20，如果需要设置 可设置set方法赋值; mWaveLength = getMeasuredWidth(); //计算所有的点 这里取宽度为整个波长 往左再延伸一个波长 两个波长则需要9个点 for (int i = 0; i < 9; i++) { int y = 0; switch (i % 4) { case 0: y = mViewHeight; break; case 1: y =mViewHeight+ mWaveHeight; break; case 2: y = mViewHeight; break; case 3: y = mViewHeight-mWaveHeight; break; } Point point = new Point(-mWaveLength + i * mWaveLength / 4, y); mPoints.add(point); } /** * 计算圆环宽度 */ int mIncircleRadius=mViewHeight<mViewWidth?mViewHeight/2:mViewWidth/2;//内切圆半径 int mcircumcircleRadius= (int) (Math.sqrt((float)(Math.pow(mViewHeight/2,2)+Math.pow(mViewWidth/2,2)))+0.5);//外接圆半径 int radius=mcircumcircleRadius/2+mIncircleRadius/2; rectF=new RectF(mViewWidth/2-radius,mViewHeight/2-radius,mViewWidth/2+radius,mViewHeight/2+radius); mStrokeWidth=mcircumcircleRadius-mIncircleRadius; mCirclePaint.setStrokeWidth(mStrokeWidth);//线是有宽度的 采用了这种方式画圆环 isMeasure = true; } } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /** * 绘制线条 */ mPath.reset(); int i = 0; mPath.moveTo(mPoints.get(0).getX()+mLeftWaveMoveLength, mPoints.get(0).getY()-mViewHeight*mProgress/100); for (; i < mPoints.size() - 2; i += 2) { mPath.quadTo(mPoints.get(i + 1).getX()+mLeftWaveMoveLength, mPoints.get(i + 1).getY()-mViewHeight*mProgress/100, mPoints.get(i + 2).getX()+mLeftWaveMoveLength, mPoints.get(i + 2).getY()-mViewHeight*mProgress/100); } mPath.lineTo(mPoints.get(i).getX()+mLeftWaveMoveLength, mViewHeight); mPath.lineTo(mPoints.get(0).getX()+mLeftWaveMoveLength, mViewHeight); mPath.close(); /** * 绘制轨迹 */ canvas.drawPath(mPath,mPaint); Rect rect = new Rect(); String progress=String.format("%d%%",mProgress); mTextPaint.getTextBounds(progress,0,progress.length(), rect); int textHeight = rect.height(); if (mProgress>=50)//如果进度达到50 颜色变为白色，没办法啊，进度在中间 不变颜色看不到 mTextPaint.setColor(Color.WHITE); else mTextPaint.setColor(mWaveColor); canvas.drawText(progress,0,progress.length(),mViewWidth/2,mViewHeight/2+textHeight/2,mTextPaint); if (isCircle) { /** * 绘制圆环 */ canvas.drawArc(rectF, 0, 360, true, mCirclePaint); Paint circlePaint = new Paint(); circlePaint.setStrokeWidth(5); circlePaint.setColor(Color.WHITE); circlePaint.setAntiAlias(true); circlePaint.setStyle(Paint.Style.STROKE); canvas.drawCircle(mViewWidth / 2, mViewHeight / 2, mViewHeight / 2, circlePaint); /** * 绘制边界 */ mBorderPaint.setStrokeWidth(mBorderWidth/2); canvas.drawCircle(mViewWidth/2,mViewHeight/2,mViewHeight/2-mBorderWidth/2,mBorderPaint); }else { /** * 绘制矩形边框 */ canvas.drawRect(0,0,mViewWidth,mViewHeight,mBorderPaint); } // handler.sendEmptyMessageDelayed(0,mTimeStep); } /** * 设置进度 基准线 * @param mProgress */ public void setmProgress(int mProgress) { this.mProgress = mProgress; mLevelLine=(100-mProgress)*mViewHeight/100; } /** * 设置是否为圆形 * @param circle */ public void setCircle(boolean circle) { isCircle = circle; }}

自定义属性

<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="LD_WaveView"> <attr name="wave_color" format="color"></attr> <attr name="wave_circle" format="boolean"></attr> </declare-styleable></resources>

总结

好了，以上就是这篇文章的全部内容了，代码里备注应该还算比较清楚了，希望能对一些人有一些帮助,瑕疵不足之处欢迎指正，或者有好的建议。也可以留言交流。