对于之前最火的无外乎集五福了，而五福除了加十个好友获得外，最直接的途径就是支付宝的咻一咻了。那么咻一咻具体有哪些实现方式呢？下面我们将一一介绍这几种思路的实现过程。

1.自定义View实现咻一咻

那么这种实现方法需要掌握Canvas以及Paint几乎所有的方法。其对程序员的专业知识要求极高。

用该种方式实现的优点有：

㈠这种是最复杂的实现方法，但其兼容性最高，其支持android的所有设备。 ㈡其对内存要求不大，几乎不占用任何内存。

下面我们来看看是怎样实现其效果的：

public class XiuYiXiuView extends View { /*** * 中心图片画笔 */ private Paint paint; /*** * 水波圆圈画笔 */ private Paint circlePaint; /*** * 用bitmap创建画布 */ private Bitmap bitmap; /*** * 中心图片 */ private Bitmap imageBit; /*** * 画布 */ private Canvas canvas; /*** * 屏幕的宽 */ private int screenWidth; /*** * 屏幕的高 */ private int screenHeight; /*** * 图片右上角坐标 */ private Point pointLeftTop; /*** * 图片右下角坐标 */ private Point pointRightBottom; /*** * 记录圆圈 */ private List<LYJCircle> lyjCircleList; /*** * 标记是否按下按钮，并且源泉是否扩散消失 */ private boolean isSpread=false; /*** * 默认没有按动时候的圆圈 */ private LYJCircle defaultCircle; public XiuYiXiuView(Context context, AttributeSet attrs) { super(context, attrs); this.lyjCircleList=new ArrayList<>(); screenWidth=LYJUtils.getScreenWidth((Activity) context); screenHeight=LYJUtils.getScreenHeight((Activity) context); bitmap = Bitmap.createBitmap(screenWidth, screenHeight, Bitmap.Config.ARGB_8888); // 设置位图的宽高 canvas = new Canvas(); canvas.setBitmap(bitmap); paint=new Paint(Paint.DITHER_FLAG); paint.setAntiAlias(true); circlePaint=new Paint(Paint.DITHER_FLAG); circlePaint.setAntiAlias(true); imageBit= BitmapFactory.decodeResource(getResources(), R.drawable.bwa_homepage_yuyin); pointLeftTop=new Point((screenWidth/2)-(imageBit.getWidth()/2),(screenHeight/2)-(imageBit.getHeight()/2)); pointRightBottom=new Point(pointLeftTop.x+imageBit.getWidth(),pointLeftTop.y+imageBit.getHeight()); canvas.drawBitmap(imageBit,pointLeftTop.x,pointLeftTop.y,paint); //取图片上的颜色 Palette.generateAsync(imageBit, new Palette.PaletteAsyncListener() { @Override public void onGenerated(Palette palette) { Palette.Swatch swatch1 = palette.getVibrantSwatch(); //充满活力的色板 circlePaint.setColor(swatch1.getRgb()); circlePaint.setStyle(Paint.Style.STROKE); circlePaint.setStrokeWidth(10); circlePaint.setAlpha(100); paint.setShadowLayer(15, 0, 0, swatch1.getRgb());//设置阴影效果 int[] mColors = new int[] {//渲染颜色 Color.TRANSPARENT,swatch1.getRgb() }; //范围，这里可以微调，实现你想要的渐变 float[] mPositions = new float[] { 0f, 0.1f }; Shader shader=new RadialGradient(screenWidth / 2,screenHeight / 2,imageBit.getWidth() / 2 + 10,mColors, mPositions, Shader.TileMode.MIRROR); circlePaint.setShader(shader); defaultCircle=new LYJCircle(screenWidth / 2, screenHeight / 2, imageBit.getWidth() / 2 + 10); clearScreenAndDrawList(); Message message = handler.obtainMessage(1); handler.sendMessageDelayed(message, 1000); //发送message } }); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()){ case MotionEvent.ACTION_DOWN: break; case MotionEvent.ACTION_MOVE: break; case MotionEvent.ACTION_UP: isSpread=true;//是否按下图片 lyjCircleList.add(new LYJCircle(screenWidth / 2, screenHeight / 2, imageBit.getWidth() / 2 + 10)); clearScreenAndDrawList(); invalidate(); break; default: break; } return true; } private Handler handler = new Handler(){ public void handleMessage(Message msg){ switch (msg.what) { case 1: //定时更新界面 clearScreenAndDrawList(); invalidate(); Message message = handler.obtainMessage(1); handler.sendMessageDelayed(message, 200); } super.handleMessage(msg); } }; /** * 清掉屏幕上所有的圆圈，然后画出集合里面的圆圈 */ private void clearScreenAndDrawList() { canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); //判断是否按下图片，并且外圈执行完成没有。 if(!isSpread){ circlePaint.setMaskFilter(null); canvas.drawCircle(defaultCircle.getRoundX(), defaultCircle.getRoundY(),defaultCircle.getRadiuLoop(), circlePaint);// 画线 }else{ for (LYJCircle lyjCircle : lyjCircleList) { if(lyjCircle.getSpreadRadiu()==0){ }else if(lyjCircle.getSpreadRadiu()>(lyjCircle.getRadiu()+99)){ //如果圆圈扩散半径大于图片半径+99，那么设置边缘模糊，也就是淡出的效果 circlePaint.setMaskFilter(new BlurMaskFilter(5, BlurMaskFilter.Blur.OUTER)); canvas.drawCircle(lyjCircle.getRoundX(), lyjCircle.getRoundY(),lyjCircle.getSpreadRadiu(), circlePaint);// 画线 }else{ //不是则按正常的环形渲染来 circlePaint.setMaskFilter(null); canvas.drawCircle(lyjCircle.getRoundX(), lyjCircle.getRoundY(),lyjCircle.getSpreadRadiu(), circlePaint);// 画线 } } } canvas.drawBitmap(imageBit,pointLeftTop.x,pointLeftTop.y,paint); //释放小时了的圆圈 for(int i=0;i<lyjCircleList.size();i++){ if(lyjCircleList.get(i).getSpreadRadiu()==0){ lyjCircleList.remove(i); } } //如果没有点击图片发射出去的圆圈，那么就恢复默认缩放。 if(lyjCircleList.size()<=0){ isSpread=false; } } @Override protected void onDraw(Canvas canvas) { canvas.drawBitmap(bitmap, 0, 0, null); } }

圆类：

package com.example.liyuanjing.model; /** * Created by liyuanjing on 2016/2/3. */ public class LYJCircle { private int roundX;//圆中心点X坐标 private int roundY;//圆中心点Y坐标 private int radiu;//圆半径 private int currentRadiu;//当前radiu private int lastRadiu;//历史radiu private int spreadRadiu;//加速半径 private int[] speed=new int[]{6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6};//半径扩大速度。这里为匀速 private int speedLast=0;//记录历史值 public LYJCircle(int roundX,int roundY,int radiu){ this.roundX=roundX; this.roundY=roundY; this.radiu=radiu; this.spreadRadiu=radiu; this.currentRadiu=this.radiu; this.lastRadiu=this.currentRadiu; } //获取半径 public int getRadiu() { return radiu; } public void setRadiu(int radiu) { this.radiu = radiu; } //获取加速半径 public int getSpreadRadiu(){ if(speedLast>=speed.length){ return 0; } spreadRadiu+=speed[speedLast]; ++speedLast; return spreadRadiu; } //获取循环缩放半径 public int getRadiuLoop() { if(currentRadiu==lastRadiu){ ++currentRadiu; }else if(currentRadiu>lastRadiu){ if(currentRadiu>(radiu+20)){ currentRadiu=19+radiu; lastRadiu=20+radiu; }else{ lastRadiu=currentRadiu; currentRadiu+=5; } }else{ if(currentRadiu<(radiu+9)){ currentRadiu=10+radiu; lastRadiu=9+radiu; }else{ lastRadiu=currentRadiu; currentRadiu-=5; } } return currentRadiu; } public int getRoundX() { return roundX; } public int getRoundY() { return roundY; } }

你可以修改如下两个地方，会产生视觉上真真的波纹效果：

①支付宝的背景图片是淡红色，衬托了红色的波纹。当然了你也可以将画布设置为透明淡红色。

②其为填充圆圈渲染，不是我的边框渲染效果，你可以将circlePaint.setStyle(Paint.Style.STROKE);换成Paint.Style.FILL.然后，微调shader的mPositions实现环形填充渐变。你也许会觉得，你看支付宝咻一咻圆圈弹开的时候内圈有波纹也像外弹开，其实那就是环形渐变，当你圆圈变大后，其渐变的范围也就变大了，自然你看到有颜色周围扩散的迹象。

2.属性动画实现咻一咻

其要掌握的只是基本只需要属性动画，在加一点线程方面有关的知识而已。

下面我们看看其实现步骤：

㈠自定义View实现一个圆即可,代码如下：

public class LYJCircleView extends View { private Bitmap bitmap; private Paint paint; private Canvas canvas; private int screenWidth; private int screenHeight; private boolean isSpreadFlag=false;//标记是否发射完成 public boolean isSpreadFlag() { return isSpreadFlag; } public void setIsSpreadFlag(boolean isSpreadFlag) { this.isSpreadFlag = isSpreadFlag; } public LYJCircleView(Context context,int width,int height,int statusHeight) { super(context); screenWidth= LYJUtils.getScreenWidth((Activity) context); screenHeight=LYJUtils.getScreenHeight((Activity) context); bitmap = Bitmap.createBitmap(screenWidth, screenHeight, Bitmap.Config.ARGB_8888); // 设置位图的宽高 canvas = new Canvas(); canvas.setBitmap(bitmap); paint=new Paint(Paint.DITHER_FLAG); paint.setAntiAlias(true); paint.setColor(Color.RED); paint.setStyle(Paint.Style.STROKE); paint.setStrokeWidth(5); paint.setAlpha(100); paint.setShadowLayer(10, 0, 0, Color.RED); int[] mColors = new int[] { Color.TRANSPARENT,Color.RED }; float[] mPositions = new float[] { 0f, 0.1f }; Shader shader=new RadialGradient(screenWidth / 2,screenHeight / 2,width / 2 + 10,mColors, mPositions, Shader.TileMode.MIRROR); paint.setShader(shader); canvas.drawCircle(screenWidth / 2, (screenHeight - statusHeight) / 2, width / 2 + 10, paint); invalidate(); } @Override protected void onDraw(Canvas canvas) { canvas.drawBitmap(bitmap,0,0,null); } }

代码与上面差不多，就不注释了。

㈡实现Activity即可

public class XiuYiXiuActivity extends AppCompatActivity { private ImageButton mImageButton; private LYJCircleView lyjCircleView; private RelativeLayout relativeLayout; private List<LYJCircleView> lyjCircleViewList; private int statusBarHeight; private Animator anim; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.xiuyixiu_activity_main); this.mImageButton=(ImageButton)findViewById(R.id.xiuyixiu_imagebutton); this.relativeLayout=(RelativeLayout)findViewById(R.id.xiuyixiu_relativelayout); this.lyjCircleViewList=new ArrayList<>(); this.mImageButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { lyjCircleView.setVisibility(View.GONE);//发射圆圈，即将循环动画View隐藏 final LYJCircleView item=new LYJCircleView(XiuYiXiuActivity.this, mImageButton.getWidth(), mImageButton.getHeight(), statusBarHeight); Animator spreadAnim = AnimatorInflater.loadAnimator(XiuYiXiuActivity.this, R.animator.circle_spread_animator); spreadAnim.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) { item.setIsSpreadFlag(true);//动画执行完成，标记一下 } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } }); spreadAnim.setTarget(item); spreadAnim.start(); lyjCircleViewList.add(item); relativeLayout.addView(item); relativeLayout.invalidate(); Message message = handler.obtainMessage(1); handler.sendMessageDelayed(message, 10); //发送message,定时释放LYJCircleView } }); } private Handler handler = new Handler(){ public void handleMessage(Message msg){ switch (msg.what) { case 1: for(int i=0;i<lyjCircleViewList.size();i++){ if(lyjCircleViewList.get(i).isSpreadFlag()){ relativeLayout.removeView(lyjCircleViewList.get(i)); lyjCircleViewList.remove(i); relativeLayout.invalidate(); } } if(lyjCircleViewList.size()<=0){ lyjCircleView.setVisibility(View.VISIBLE); } Message message = handler.obtainMessage(1); handler.sendMessageDelayed(message, 10); } super.handleMessage(msg); } }; @Override public void onWindowFocusChanged(boolean hasFocus) { super.onWindowFocusChanged(hasFocus); //获取状态栏高度 Rect frame = new Rect(); getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); statusBarHeight = frame.top; this.mImageButton.post(new Runnable() { @Override public void run() { lyjCircleView = new LYJCircleView(XiuYiXiuActivity.this, mImageButton.getWidth(), mImageButton.getHeight(), statusBarHeight); relativeLayout.addView(lyjCircleView); relativeLayout.postInvalidate(); // 加载动画 anim = AnimatorInflater.loadAnimator(XiuYiXiuActivity.this, R.animator.circle_scale_animator); anim.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) { anim.start();//循环执行动画 } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } }); anim.setTarget(lyjCircleView); anim.start(); } }); } }

㈢布局文件代码如下：

<"1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/xiuyixiu_relativelayout" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageButton android:id="@+id/xiuyixiu_imagebutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:background="@drawable/bwa_homepage_yuyin"/> </RelativeLayout>

当然上面两个实现方法，我都只设置圆边框，没有填充，你可以设置为填充后，在微调渐变值。

其属性动画文件circle_scale_animator.xml：

<"1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:ordering="together"> <objectAnimator android:duration="1000" android:propertyName="scaleX" android:valueFrom="1.0" android:valueTo="1.2" android:valueType="floatType"> </objectAnimator> <objectAnimator android:duration="1000" android:propertyName="scaleY" android:valueFrom="1.0" android:valueTo="1.2" android:valueType="floatType"> </objectAnimator> <objectAnimator android:startOffset="1000" android:duration="1000" android:propertyName="scaleX" android:valueFrom="1.2" android:valueTo="1.0" android:valueType="floatType"> </objectAnimator> <objectAnimator android:startOffset="1000" android:duration="1000" android:propertyName="scaleY" android:valueFrom="1.2" android:valueTo="1.0" android:valueType="floatType"> </objectAnimator> </set>

另一个circle_spread_animator.xml为：

<"1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <objectAnimator android:duration="1000" android:propertyName="scaleY" android:valueFrom="1.0" android:valueTo="2.0" android:valueType="floatType"> </objectAnimator> <objectAnimator android:duration="1000" android:propertyName="scaleX" android:valueFrom="1.0" android:valueTo="2.0" android:valueType="floatType"> </objectAnimator> </set>

以上就是本文的详细内容，希望对大家的学习有所帮助。