实现支付宝咻一咻的几种思路

对于现在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);
        }
    };

    /**
     * 清掉屏幕上所有的线，然后画出集合里面的线
     */
    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);
    }
}

看看其效果图：



这里实现的效果没有支付宝好看自然有两个原因：

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。

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。

其效果图如下：

3.Android 5.0逆天实现咻一咻

这个仅标记出来，不做讲解，不过有几个知识提示一下，你就明白了，不过此种方式实现只兼容5.0以上设备，不兼容5.0以下设备。

我们都知道5.0中提供如下两个属性：

android:background="?android:attr/selectableItemBackground"波纹有边界

android:background="?android:attr/selectableItemBackgroundBorderless"波纹超出边界

设置下面这个就会绘制一个圆形的波纹（不管你的控件是不是圆形）。

通过android:colorControlHighlight设置波纹颜色。

那么好了就，介绍这么多了，时间匆促，要过年了。