版本：1.0
日期：2014.8.9 2014.9.24
版权：© 2014 kince 转载注明出处
波形效果有几种不同的呈现形式，比如从中间向四周散开的波形，也就是熟知的水涟漪；还有上下波动的曲线，像五线谱等。英文中可以称作Wave或者Ripple，所以暂且叫它们WaveView、WaveLayout、RippleView、RippleLayout，接下来开始实现这些效果。
首先看一下Solo 火爆足球动态壁纸，
下面中间的按钮就是一个波形按钮，它会不断地向四周辐射，由于是静态图，如果想体验真实效果可以另行下载。这种效果的实现思路是不断绘制圆形，当然半径也要不断变化，透明度也是一样。代码如下：
/**
*
*/
package com.kince.rippleview;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.View;
/**
* @author kince
* @category 波纹
* @since 2014.8.9
* @version v1.0.0
*
*/
public class RippleView extends View {
private int mScreenWidth;
private int mScreenHeight;
private Bitmap mRippleBitmap;
private Paint mRipplePaint = new Paint();
private int mBitmapWidth;
private int mBitmapHeight;
private boolean isStartRipple;
private int heightPaddingTop;
private int heightPaddingBottom;
private int widthPaddingLeft;
private int widthPaddingRight;
private RectF mRect = new RectF();
private int rippleFirstRadius = 0;
private int rippleSecendRadius = -33;
private int rippleThirdRadius = -66;
private Paint textPaint = new Paint();
private String mText="点击我吧";
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
invalidate();
if (isStartRipple) {
rippleFirstRadius++;
if (rippleFirstRadius > 100) {
rippleFirstRadius = 0;
}
rippleSecendRadius++;
if (rippleSecendRadius > 100) {
rippleSecendRadius = 0;
}
rippleThirdRadius++;
if (rippleThirdRadius > 100) {
rippleThirdRadius = 0;
}
sendEmptyMessageDelayed(0, 20);
}
}
};
/**
* @param context
*/
public RippleView(Context context) {
super(context);
// TODO Auto-generated constructor stub
init();
}
/**
* @param context
* @param attrs
*/
public RippleView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
init();
}
/**
* @param context
* @param attrs
* @param defStyleAttr
*/
public RippleView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// TODO Auto-generated constructor stub
init();
}
private void init() {
mRipplePaint.setColor(4961729);
mRipplePaint.setAntiAlias(true);
mRipplePaint.setStyle(Paint.Style.FILL);
textPaint.setTextSize(26);
textPaint.setAntiAlias(true);
textPaint.setStyle(Paint.Style.FILL);
textPaint.setColor(Color.WHITE);
mRippleBitmap = BitmapFactory.decodeStream(getResources()
.openRawResource(R.drawable.easy3d_ic_apply));
mBitmapWidth = mRippleBitmap.getWidth();
mBitmapHeight = mRippleBitmap.getHeight();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int mh = getMeasuredHeight() - getPaddingTop() - getPaddingBottom();
int mw = getMeasuredWidth() - getPaddingLeft() - getPaddingRight();
if (mBitmapWidth < 2 * mBitmapHeight) {
mBitmapWidth = (2 * mBitmapHeight);
}
setMeasuredDimension(mBitmapWidth, mBitmapHeight);
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
if (isStartRipple) {
float f1 = 3 * mBitmapHeight / 10;
mRipplePaint.setAlpha(255);
canvas.drawCircle(mBitmapWidth / 2, mBitmapHeight,
7 * mBitmapHeight / 10, mRipplePaint);
int i1 = (int) (220.0F - (220.0F - 0.0F) / 100.0F
* rippleFirstRadius);
mRipplePaint.setAlpha(i1);
canvas.drawCircle(mBitmapWidth / 2, mBitmapHeight, 7
* mBitmapHeight / 10 + f1 * rippleFirstRadius / 100.0F,
mRipplePaint);
if (rippleSecendRadius >= 0) {
int i3 = (int) (220.0F - (220.0F - 0.0F) / 100.0F
* rippleSecendRadius);
mRipplePaint.setAlpha(i3);
canvas.drawCircle(mBitmapWidth / 2, mBitmapHeight,
7 * mBitmapHeight / 10 + f1 * rippleSecendRadius
/ 100.0F, mRipplePaint);
}
if (rippleThirdRadius >= 0) {
int i2 = (int) (220.0F - (220.0F - 0.0F) / 100.0F
* rippleThirdRadius);
mRipplePaint.setAlpha(i2);
canvas.drawCircle(mBitmapWidth / 2, mBitmapHeight, 7
* mBitmapHeight / 10 + f1 * rippleThirdRadius / 100.0F,
mRipplePaint);
}
}
mRipplePaint.setAlpha(30);
canvas.drawCircle(mBitmapWidth / 2, mBitmapHeight, mBitmapHeight,
mRipplePaint);
mRipplePaint.setAlpha(120);
canvas.drawCircle(mBitmapWidth / 2, mBitmapHeight,
9 * mBitmapHeight / 10, mRipplePaint);
mRipplePaint.setAlpha(180);
canvas.drawCircle(mBitmapWidth / 2, mBitmapHeight,
8 * mBitmapHeight / 10, mRipplePaint);
mRipplePaint.setAlpha(255);
canvas.drawCircle(mBitmapWidth / 2, mBitmapHeight,
7 * mBitmapHeight / 10, mRipplePaint);
float length = textPaint.measureText(mText);
canvas.drawText(mText, (mBitmapWidth - length) / 2,
mBitmapHeight * 3 / 4, textPaint);
}
@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;
confirmSize();
invalidate();
}
private void confirmSize() {
int minScreenSize = Math.min(mScreenWidth, mScreenHeight);
int widthOverSize = mScreenWidth - minScreenSize;
int heightOverSize = mScreenHeight - minScreenSize;
heightPaddingTop = (getPaddingTop() + heightOverSize / 2);
heightPaddingBottom = (getPaddingBottom() + heightOverSize / 2);
widthPaddingLeft = (getPaddingLeft() + widthOverSize / 2);
widthPaddingRight = (getPaddingRight() + widthOverSize / 2);
int width = getWidth();
int height = getHeight();
mRect = new RectF(widthPaddingLeft, heightPaddingTop, width
- widthPaddingRight, height * 2 - heightPaddingBottom);
}
public void stratRipple() {
isStartRipple = true;
handler.sendEmptyMessage(0);
}
}
下图是某个应用的流量显示界面，使用的是上面说的第二种形式。
实现上面效果的思路是使用正弦或者余弦曲线，代码如下：
/**
*
*/
package com.kince.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;
/**
* @author kince
* @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;
private int mCircleColor = Color.WHITE;
private int mRingColor = Color.WHITE;
private int mWaveColor = Color.WHITE;
private Handler mHandler;
private long c = 0L;
private boolean mStarted = false;
private final float f = 0.033F;
private int mAlpha = 50;// 透明度
private float mAmplitude = 10.0F; // 振幅
private float mWateLevel = 0.5F;// 水高(0~1)
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);
}
private void init(Context context) {
mRingPaint = new Paint();
mRingPaint.setColor(mRingColor);
mRingPaint.setAlpha(50);
mRingPaint.setStyle(Paint.Style.STROKE);
mRingPaint.setAntiAlias(true);
mRingPaint.setStrokeWidth(mRingSTROKEWidth);
mCirclePaint = new Paint();
mCirclePaint.setColor(mCircleColor);
mCirclePaint.setStyle(Paint.Style.STROKE);
mCirclePaint.setAntiAlias(true);
mCirclePaint.setStrokeWidth(mCircleSTROKEWidth);
linePaint = new Paint();
linePaint.setColor(mCircleColor);
linePaint.setStyle(Paint.Style.STROKE);
linePaint.setAntiAlias(true);
linePaint.setStrokeWidth(mLineSTROKEWidth);
flowPaint = new Paint();
flowPaint.setColor(mCircleColor);
flowPaint.setStyle(Paint.Style.FILL);
flowPaint.setAntiAlias(true);
flowPaint.setTextSize(36);
leftPaint = new Paint();
leftPaint.setColor(mCircleColor);
leftPaint.setStyle(Paint.Style.FILL);
leftPaint.setAntiAlias(true);
leftPaint.setTextSize(18);
mWavePaint = new Paint();
mWavePaint.setStrokeWidth(1.0F);
mWavePaint.setColor(mWaveColor);
mWavePaint.setAlpha(mAlpha);
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(mContext.getResources().getColor(
R.color.holo_purple2));
canvas.drawCircle(mScreenWidth / 2, mScreenHeight / 2,
mScreenWidth / 4, mRingPaint);
canvas.drawCircle(mScreenWidth / 2, mScreenHeight / 2, mScreenWidth / 4
- mRingSTROKEWidth / 2, mCirclePaint);
canvas.drawLine(mScreenWidth * 3 / 8, mScreenHeight * 5 / 8,
mScreenWidth * 5 / 8, mScreenHeight * 5 / 8, linePaint);
float num = flowPaint.measureText(flowNum);
canvas.drawText(flowNum, mScreenWidth * 4 / 8 - num / 2,
mScreenHeight * 4 / 8, flowPaint);
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
if ((!mStarted) || (mScreenWidth == 0) || (mScreenHeight == 0)) {
RectF oval = new RectF(mScreenWidth / 4 + mRingSTROKEWidth / 2,
mScreenHeight / 4 + mRingSTROKEWidth / 2, mScreenWidth * 3
/ 4 - mRingSTROKEWidth / 2, mScreenHeight * 3 / 4
- mRingSTROKEWidth / 2);// 设置个新的长方形，扫描测量
canvas.drawArc(oval, 0, 180, true, mWavePaint);
return;
}
// 绘制,即水面静止时的高度
RectF oval = new RectF(mScreenWidth / 4 + mRingSTROKEWidth / 2,
mScreenHeight / 4 + mRingSTROKEWidth / 2 + mAmplitude * 2,
mScreenWidth * 3 / 4 - mRingSTROKEWidth / 2, mScreenHeight * 3
/ 4 - mRingSTROKEWidth / 2);// 设置个新的长方形，扫描测量
canvas.drawArc(oval, 0, 180, true, 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 - mWateLevel);
int top = (int) (f1 + mAmplitude);
mPath.reset();
int startX = mScreenWidth / 2 - mScreenWidth / 4 + mRingSTROKEWidth / 2;
// 波浪效果
while (startX < mScreenWidth / 2 + mScreenWidth / 4 - mRingSTROKEWidth
/ 2) {
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.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];
}
};
}
}
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