Acdroid 波浪按鈕 rippleview
波形按鈕，它會不斷地向四周輻射，這種效果的實現思路是不斷繪製圓形，當然半徑也要不斷變化，透明度也是一樣。代碼如下：
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/****/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 波紋*
@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=點擊我吧; 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); }} |