支付宝咻一咻在过年的时候很火热。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 {
private Paint paint;
private Paint circlePaint;
private Bitmap bitmap;
private Bitmap imageBit;
private Canvas canvas;
private int screenWidth;
private int screenHeight;
private Point pointLeftTop;
private Point pointRightBottom;
private List<LYJCircle> lyjCircleList;
private boolean isSpread=false;
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);
}
};
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;
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;
}
}
看看其效果图：
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：
<?xml version="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：
<?xml version="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：
<?xml version="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>
其效果图如下：
