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首页 / 移动开发 / Android / Android自定义WaveView实现波浪进度效果

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(){@Overridepublic 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_WaveViewandroid: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_WaveViewandroid: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() {@Overridepublic 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);elsemTextPaint.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。