Android 流量球效果的WaveView

Android 流量球效果的WaveView

先看效果图：

实现上面效果的思路是使用正弦或者余弦曲线，代码如下：

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packagecom.nero.waveview;   importandroid.content.Context; importandroid.graphics.Canvas; importandroid.graphics.Color; importandroid.graphics.Paint; importandroid.graphics.Path; importandroid.graphics.RectF; importandroid.os.Handler; importandroid.os.Parcel; importandroid.os.Parcelable; importandroid.util.AttributeSet; importandroid.view.View; importandroid.widget.ProgressBar;   /** * @category View必须是正方形 * */ publicclass WaterWaveView extendsView {        privateContext mContext;        privateint mScreenWidth;      privateint mScreenHeight;        privatePaint mRingPaint;      privatePaint mCirclePaint;      privatePaint mWavePaint;      privatePaint linePaint;      privatePaint flowPaint;      privatePaint leftPaint;        privateint mRingSTROKEWidth = 15;      privateint mCircleSTROKEWidth = 2;      privateint mLineSTROKEWidth = 1;   // 细圆      privateint mCircleColor = Color.WHITE; // 文字颜色 privateintmTextColor = Color.WHITE; // 粗圆      privateint mRingColor = Color.GREEN; // 波浪颜色      privateint mWaveColor = Color.GREEN; // 背景颜色    privateint mBackgroundColor = Color.LTGRAY;        privateHandler mHandler;      privatelong c = 0L;      privateboolean mStarted = false;      privatefinal float f = 0.033F;      privateint mAlpha = 100;// 透明度，可酌情设置，设置太小和背景颜色衬托下，显得波浪效果不好      privatefloat mAmplitude = 6.0F;// 振幅越大，波浪效果越明显，但是10%的时候，显得效果不好，建议不要超过10，可酌情设置      privatefloat mWateLevel = 0.5F;// 水位线(0~1)，初始水位线      privatePath mPath;        privateString flowNum = "1024M";      privateString flowLeft = "还剩余";        /**      * @param context      */      publicWaterWaveView(Context context) {           super(context);           // TODO Auto-generated constructor stub           mContext = context;           init(mContext);      }        /**      * @param context      * @param attrs      */      publicWaterWaveView(Context context, AttributeSet attrs) {           super(context, attrs);           // TODO Auto-generated constructor stub           mContext = context;           init(mContext);      }        /**      * @param context      * @param attrs      * @param defStyleAttr      */      publicWaterWaveView(Context context, AttributeSet attrs, intdefStyleAttr) {           super(context, attrs, defStyleAttr);           // TODO Auto-generated constructor stub           mContext = context;           init(mContext);      }    /** * 设置水位线，0-1    *    */    public setmWateLevel(float mWateLevel) {         this.mWateLevel = mWateLevel ;    }  /** * 设置振幅  *  */  public setmAmplitude(float mAmplitude) {       this.mAmplitude=mAmplitude;  }  /** * 设置中间文字  *  */  public setWaveViewText(String floLeft, String flowNum)        this.floLeft=floLeft;       this.flowNum=flowNum;  }        privatevoid init(Context context) { // 粗圆           mRingPaint = newPaint();           mRingPaint.setColor(mRingColor);           mRingPaint.setAlpha(50);           mRingPaint.setStyle(Paint.Style.STROKE);           mRingPaint.setAntiAlias(true);           mRingPaint.setStrokeWidth(mRingSTROKEWidth);   // 细圆           mCirclePaint = newPaint();           mCirclePaint.setColor(mCircleColor);           mCirclePaint.setStyle(Paint.Style.STROKE);           mCirclePaint.setAntiAlias(true);           mCirclePaint.setStrokeWidth(mCircleSTROKEWidth);   // 横线（可不画） //          linePaint = newPaint(); //          linePaint.setColor(mCircleColor); //          linePaint.setStyle(Paint.Style.STROKE); //          linePaint.setAntiAlias(true); //          linePaint.setStrokeWidth(mLineSTROKEWidth);   // 1024M           flowPaint = newPaint();           flowPaint.setColor(mCircleColor);           flowPaint.setStyle(Paint.Style.FILL);           flowPaint.setAntiAlias(true);           flowPaint.setTextSize(36);   // 还剩余           leftPaint = newPaint();           leftPaint.setColor(mCircleColor);           leftPaint.setStyle(Paint.Style.FILL);           leftPaint.setAntiAlias(true);           leftPaint.setTextSize(18);   // 波浪           mWavePaint = newPaint();           mWavePaint.setStrokeWidth(1.0F);           mWavePaint.setColor(mWaveColor); //          mWavePaint.setAlpha(mAlpha); // 酌情设置透明度           mPath = newPath();             mHandler = newHandler() {                @Override                publicvoid handleMessage(android.os.Message msg) {                     if(msg.what == 0) {                          invalidate();                          if(mStarted) {                               // 不断发消息给自己，使自己不断被重绘                               mHandler.sendEmptyMessageDelayed(0, 60L);                          }                     }                }           };      }        @Override      protectedvoid onMeasure(intwidthMeasureSpec, intheightMeasureSpec) {           intwidth = measure(widthMeasureSpec, true);           intheight = measure(heightMeasureSpec, false);           if(width < height) {                setMeasuredDimension(width, width);           }else{                setMeasuredDimension(height, height);           }        }        /**      * @category 测量      * @param measureSpec      * @param isWidth      * @return      */      privateint measure(intmeasureSpec, booleanisWidth) {           intresult;           intmode = MeasureSpec.getMode(measureSpec);           intsize = MeasureSpec.getSize(measureSpec);           intpadding = isWidth ? getPaddingLeft() + getPaddingRight()                     : getPaddingTop() + getPaddingBottom();           if(mode == MeasureSpec.EXACTLY) {                result = size;           }else{                result = isWidth ? getSuggestedMinimumWidth()                          : getSuggestedMinimumHeight();                result += padding;                if(mode == MeasureSpec.AT_MOST) {                     if(isWidth) {                          result = Math.max(result, size);                     }else{                          result = Math.min(result, size);                     }                }           }           returnresult;      }        @Override      protectedvoid onSizeChanged(intw, inth, intoldw, intoldh) {           // TODO Auto-generated method stub           super.onSizeChanged(w, h, oldw, oldh);           mScreenWidth = w;           mScreenHeight = h;      }        @Override      protectedvoid onDraw(Canvas canvas) {           // TODO Auto-generated method stub           super.onDraw(canvas);           // 得到控件的宽高           intwidth = getWidth();           intheight = getHeight();           setBackgroundColor(mBackgroundColor);   // 计算当前水位线与水平中线的距离 float centerOffset = Math.abs(mScreenWidth /2 *mWateLevel -mScreenWidth /4); // 计算当前水位线与水平中线的角度 float horiAngle= (float)(Math.asin(centerOffset/(mScreenWidth /4) * 180 / Math.PI); // 扇形的其实角度和扫过角度 float startAngle, sweepAngle; if(mWateLevel > 0.5F){   startAngle = 360F - horiAngle; sweepAngle = 180F + 2 * horiAngle; }else{   startAngle = horiAngle; sweepAngle = 180F - 2 * horiAngle; }            // 中间横线可以不画 //canvas.drawLine(mScreenWidth * 3/8, mScreenHeight * 5/8 //                    mScreenWidth * 5/8, mScreenHeight * 5/8, linePaint); // 画 1024M         floatnum = flowPaint.measureText(flowNum);         canvas.drawText(flowNum, mScreenWidth * 4/ 8- num / 2, mScreenHeight * 4/ 8, flowPaint); // 画 还剩余         floatleft = leftPaint.measureText(flowLeft);         canvas.drawText(flowLeft, mScreenWidth * 4/ 8- left / 2,  mScreenHeight * 3/ 8, leftPaint);           // 如果未开始（未调用startWave方法）,绘制一个扇形，水平静止的水位线         if((!mStarted) || (mScreenWidth == 0) || (mScreenHeight == 0)) {              RectF oval = newRectF(mScreenWidth / 4, mScreenHeight / 4, mScreenWidth * 3/4, mScreenHeight * 3/4);// 设置个新的长方形，扫描测量              canvas.drawArc(oval,startAngle,sweepAngle,false, mWavePaint);              return;         }         // 绘制,即水面静止时的高度         RectF oval = newRectF(mScreenWidth / 4, mScreenHeight/ 4,  mScreenWidth * 3/ 4, mScreenHeight * 3/4);// 设置个新的长方形，扫描测量         canvas.drawArc(oval,startAngle,sweepAngle,false, mWavePaint);           if(this.c >= 8388607L) {              this.c = 0L;         }         // 每次onDraw时c都会自增         c = (1L + c);         float f1 = mScreenHeight * (1.0F - (0.25F + mWateLevel / 2 )) - mAmplitude ; // 当前水平线长度 float waveWidth = (float)Math.sqrt(mScreenWidth *mScreenWidth /16 - centerOffset * centerOffset ); // 与圆半径的偏移量 float offsetWidth = mScreenWidth * 4 - waveWidth ;         int top = (int) (f1 + mAmplitude);         mPath.reset(); // 起始振动X坐标         int startX ，endX; if(mWateLevel > 0.5F){ startX = (int)(mScreenWidth / 4 + offsetWidth); endX= (int)(mScreenWidth / 2 +mScreenWidth / 4 - offsetWidth); }else{ startX = (int)(mScreenWidth / 4 + offsetWidth - mAmplitude ); endX= (int)(mScreenWidth / 2 +mScreenWidth / 4 - offsetWidth + mAmplitude ); }         // 波浪效果         while(startX < endX) {             intstartY = (int) (f1 - mAmplitude  * Math.sin(Math.PI  * (2.0F * (startX + this.c * width * this.f)) / width));             canvas.drawLine(startX, startY, startX, top, mWavePaint);             startX++;         } canvas.drawCircle(mScreenWidth / 2, mScreenHeight / 2,mScreenWidth / 4 + mRingSTROKEWidth / 2, mRingPaint);         canvas.drawCircle(mScreenWidth / 2, mScreenHeight / 2, mScreenWidth / 4, mCirclePaint);                    canvas.restore();      }        @Override      publicParcelable onSaveInstanceState() {           // Force our ancestor class to save its state           Parcelable superState = super.onSaveInstanceState();           SavedState ss = newSavedState(superState);           ss.progress = (int) c;           returnss;      }        @Override      publicvoid onRestoreInstanceState(Parcelable state) {           SavedState ss = (SavedState) state;           super.onRestoreInstanceState(ss.getSuperState());           c = ss.progress;      }        @Override      protectedvoid onAttachedToWindow() {           super.onAttachedToWindow();           // 关闭硬件加速，防止异常unsupported operation exception           this.setLayerType(View.LAYER_TYPE_SOFTWARE,null);      }        @Override      protectedvoid onDetachedFromWindow() {           super.onDetachedFromWindow();      }        /**      * @category 开始波动      */      publicvoid startWave() {           if(!mStarted) {                this.c = 0L;                mStarted = true;                this.mHandler.sendEmptyMessage(0);           }      }        /**      * @category 停止波动      */      publicvoid stopWave() {           if(mStarted) {                this.c = 0L;                mStarted = false;                this.mHandler.removeMessages(0);           }      }        /**      * @category 保存状态      */      staticclass SavedState extendsBaseSavedState {           intprogress;             /**           * Constructor called from {@link ProgressBar#onSaveInstanceState()}           */           SavedState(Parcelable superState) {                super(superState);           }             /**           * Constructor called from {@link #CREATOR}           */           privateSavedState(Parcel in) {                super(in);                progress = in.readInt();           }             @Override           publicvoid writeToParcel(Parcel out, intflags) {                super.writeToParcel(out, flags);                out.writeInt(progress);           }             publicstatic final Parcelable.Creator<Savedstate> CREATOR = newParcelable.Creator<Savedstate>() {                publicSavedState createFromParcel(Parcel in) {                     returnnew SavedState(in);                }                  publicSavedState[] newArray(intsize) {                     returnnew SavedState[size];                }           };      }   }

java 代码调用：

  waterWaveView.setmWateLevel(progress);

waterWaveView.setmAmplitude(2);

waterWaveView.startWave();

waterWaveView.stopWave();