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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package com.nero.waveview; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.graphics.RectF; import android.os.Handler; import android.os.Parcel; import android.os.Parcelable; import android.util.AttributeSet; import android.view.View; import android.widget.ProgressBar; /** *
@category View必须是正方形 * */ public class
WaterWaveView extends View
{ private Context
mContext; private int
mScreenWidth; private int
mScreenHeight; private Paint
mRingPaint; private Paint
mCirclePaint; private Paint
mWavePaint; private Paint
linePaint; private Paint
flowPaint; private Paint
leftPaint; private int
mRingSTROKEWidth = 15 ; private int
mCircleSTROKEWidth = 2 ; private int
mLineSTROKEWidth = 1 ;
// 细圆
private int
mCircleColor = Color.WHITE; //
文字颜色
private int
mRingColor = Color.GREEN; //
波浪颜色 private int
mWaveColor = Color.GREEN;
//
背景颜色 private int
mBackgroundColor = Color.LTGRAY; private Handler
mHandler; private long
c = 0L; private boolean
mStarted = false ; private final
float
f = 0 .033F; private int
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 private float
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 private float
mWateLevel = 0 .5F; //
水位线(0~1),初始水位线 private Path
mPath; private String
flowNum = "1024M"; private String
flowLeft = "还剩余"; /** *
@param context */ public WaterWaveView(Context
context) { super (context); //
TODO Auto-generated constructor stub mContext
= context; init(mContext); } /** *
@param context *
@param attrs */ public WaterWaveView(Context
context, AttributeSet attrs) { super (context,
attrs); //
TODO Auto-generated constructor stub mContext
= context; init(mContext); } /** *
@param context *
@param attrs *
@param defStyleAttr */ public WaterWaveView(Context
context, AttributeSet attrs, int defStyleAttr)
{ 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;
} private void
init(Context context) { //
粗圆 mRingPaint
= new Paint(); mRingPaint.setColor(mRingColor); mRingPaint.setAlpha( 50 ); mRingPaint.setStyle(Paint.Style.STROKE); mRingPaint.setAntiAlias( true ); mRingPaint.setStrokeWidth(mRingSTROKEWidth);
// 细圆
mCirclePaint
= new Paint(); mCirclePaint.setColor(mCircleColor); mCirclePaint.setStyle(Paint.Style.STROKE); mCirclePaint.setAntiAlias( true ); mCirclePaint.setStrokeWidth(mCircleSTROKEWidth);
// 横线(可不画)
// linePaint
= new Paint(); // linePaint.setColor(mCircleColor); // linePaint.setStyle(Paint.Style.STROKE); // linePaint.setAntiAlias( true ); // linePaint.setStrokeWidth(mLineSTROKEWidth);
// 1024M
flowPaint
= new Paint(); flowPaint.setColor(mCircleColor); flowPaint.setStyle(Paint.Style.FILL); flowPaint.setAntiAlias( true ); flowPaint.setTextSize( 36 );
// 还剩余
leftPaint
= new Paint(); leftPaint.setColor(mCircleColor); leftPaint.setStyle(Paint.Style.FILL); leftPaint.setAntiAlias( true ); leftPaint.setTextSize( 18 );
// 波浪
mWavePaint
= new Paint(); mWavePaint.setStrokeWidth( 1 .0F); mWavePaint.setColor(mWaveColor); // mWavePaint.setAlpha(mAlpha);
// 酌情设置透明度 mPath
= new Path(); mHandler
= new Handler()
{ @Override public void
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 protected void
onMeasure( int widthMeasureSpec,
int heightMeasureSpec)
{ int width
= measure(widthMeasureSpec, true ); int height
= measure(heightMeasureSpec, false ); if (width
< height) { setMeasuredDimension(width,
width); } else { setMeasuredDimension(height,
height); } } /** *
@category 测量 *
@param measureSpec *
@param isWidth *
@return */ private int
measure( int measureSpec,
boolean isWidth)
{ int result; int mode
= MeasureSpec.getMode(measureSpec); int size
= MeasureSpec.getSize(measureSpec); int padding
= 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); } } } return result; } @Override protected void
onSizeChanged( int w,
int h,
int oldw,
int oldh)
{ //
TODO Auto-generated method stub super .onSizeChanged(w,
h, oldw, oldh); mScreenWidth
= w; mScreenHeight
= h; } @Override protected void
onDraw(Canvas canvas) { //
TODO Auto-generated method stub super .onDraw(canvas); //
得到控件的宽高 int width
= getWidth(); int height
= 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);
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 float num
= flowPaint.measureText(flowNum); canvas.drawText(flowNum,
mScreenWidth * 4 /
8 -
num / 2 ,
mScreenHeight
* 4 /
8 ,
flowPaint);
//
画 还剩余 float left
= 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 = new RectF(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 = new RectF(mScreenWidth
/ 4 ,
mScreenHeight ,
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)
{
int startY
= ( 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 public Parcelable
onSaveInstanceState() { //
Force our ancestor class to save its state Parcelable
superState = super .onSaveInstanceState(); SavedState
ss = new SavedState(superState); ss.progress
= ( int )
c; return ss; } @Override public void
onRestoreInstanceState(Parcelable state) { SavedState
ss = (SavedState) state; super .onRestoreInstanceState(ss.getSuperState()); c
= ss.progress; } @Override protected void
onAttachedToWindow() { super .onAttachedToWindow(); //
关闭硬件加速,防止异常unsupported operation exception this .setLayerType(View.LAYER_TYPE_SOFTWARE, null ); } @Override protected void
onDetachedFromWindow() { super .onDetachedFromWindow(); } /** *
@category 开始波动 */ public void
startWave() { if (!mStarted)
{ this .c
= 0L; mStarted
= true ; this .mHandler.sendEmptyMessage( 0 ); } } /** *
@category 停止波动 */ public void
stopWave() { if (mStarted)
{ this .c
= 0L; mStarted
= false ; this .mHandler.removeMessages( 0 ); } } /** *
@category 保存状态 */ static class
SavedState extends BaseSavedState
{ int progress; /** *
Constructor called from {@link ProgressBar#onSaveInstanceState()} */ SavedState(Parcelable
superState) { super (superState); } /** *
Constructor called from {@link #CREATOR} */ private SavedState(Parcel
in) { super (in); progress
= in.readInt(); } @Override public void
writeToParcel(Parcel out, int flags)
{ super .writeToParcel(out,
flags); out.writeInt(progress); } public static
final
Parcelable.Creator<Savedstate> CREATOR = new Parcelable.Creator<Savedstate>()
{ public SavedState
createFromParcel(Parcel in) { return new
SavedState(in); } public SavedState[]
newArray( int size)
{ return new
SavedState[size]; } }; } } |
java 代码调用:
waterWaveView.set
mWateLevel(progress);
waterWaveView.setmAmplitude(2);
waterWaveView.startWave();
waterWaveView.stopWave();