仿映客送礼特效

这里写链接内容仿映客送小礼物的特效，顺便复习一下属性动画，话不多说先看效果图。

需求分析

可以看到整个动画有几部分组成，那我们就把每个部分拆分出来各个击破。
1.要显示那些内容以及内容间的位置关系？
可以看到我们要显示用户头像，昵称，礼物图标以及数量。所以这里我选择用FrameLayout来作为根布局。
2.需要哪些动画以及动画的执行顺序？
a.首先是整体从左到右飞入并有一个回弹（translationX + OvershootInterpolator）
b.然后是礼物从左到右飞入而且是一个带减速效果的（translationX + DecelerateInterpolator）
c.礼物数量依次累加同时伴随着缩放（scale+repeat）
d.后面的粒子效果（帧动画）
e.整体向上平移并且逐渐消失（translationY + alpha）
3.送礼的区域有两块（A，B），如何分配？
因为用户送礼的数量不固定，所以动画持续的时间也不一定。但是我们希望这两块区域能得到充分的使用，即我们需要一个队列存放这些礼物实例，A和B谁空闲，就分配给谁处理。
4.以上所有内容是否使用原生的空间就能实现？
正如上面的分析，我们有时操作整体，有时操作局部。这时我们最好能自定义一个布局继承FrameLayout，其实也就是封装一层，这样我们就可以很好的控制整个布局。除此之外，还有我们注意到礼物数量是带描边的，貌似需要我们自定义实现了。

功能实现

需求分析完了，接下来我们说说功能的实现。
首先来打我们的整体布局。

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">


    <RelativeLayout
        android:id="@+id/animation_person_rl"
        android:layout_width="wrap_content"
        android:layout_height="39dp"
        android:layout_gravity="left"
        android:layout_marginTop="22dp"
        android:background="@drawable/bg_giftlayout">

        <ImageView
            android:id="@+id/gift_userheader_iv"
            android:layout_width="39dp"
            android:layout_height="39dp"
            android:layout_margin="3dp"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:src="@mipmap/ember" />

        <TextView
            android:id="@+id/gift_usernickname_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="6dp"
            android:layout_marginTop="4dp"
            android:layout_toRightOf="@id/gift_userheader_iv"
            android:text="库日天"
            android:textColor="#ffffff"
            android:textSize="12sp" />

        <TextView
            android:id="@+id/gift_usersign_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@id/gift_usernickname_tv"
            android:layout_below="@id/gift_usernickname_tv"
            android:layout_marginTop="4dp"
            android:ellipsize="end"
            android:text="送一个超级无敌"
            android:textColor="#ffea79"
            android:textSize="11sp" />

        <ImageView
            android:id="@+id/animation_gift"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/gift_usersign_tv"
            android:background="@mipmap/diamond2x" />
    </RelativeLayout>



    <ImageView
        android:id="@+id/animation_light"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="120dp"
        android:src="@drawable/light_star_anim" />


    <com.example.work.animationdemo.StrokeTextView
        android:id="@+id/animation_num"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="185dp"
        android:layout_marginTop="12dp"
        android:text="x 1"
        android:textColor="#0076ff"
        android:textSize="24sp"
        app:innnerColor="#ffffff"
        app:outerColor="#0076ff" />

</FrameLayout>

这里比较简单不多说了，重点看下StrokeTextView，带描边的textview，其实就是重写了ondraw方法先绘制外层，在绘制内层。

 @Override
    protected void onDraw(Canvas canvas) {
        if (m_bDrawSideLine) {
            // 描外层
            setTextColorUseReflection(mOuterColor);
            m_TextPaint.setStrokeWidth(5);
            m_TextPaint.setStyle(Paint.Style.FILL_AND_STROKE);
            super.onDraw(canvas);

            // 描内层，恢复原先的画笔
            setTextColorUseReflection(mInnerColor);
            m_TextPaint.setStrokeWidth(0);
            m_TextPaint.setStyle(Paint.Style.FILL_AND_STROKE);

        }
        super.onDraw(canvas);
    }
    /**
     * 使用反射的方法进行字体颜色的设置
     * @param color
     */
    private void setTextColorUseReflection(int color) {
        Field textColorField;
        try {
            textColorField = TextView.class.getDeclaredField("mCurTextColor");
            textColorField.setAccessible(true);
            textColorField.set(this, color);
            textColorField.setAccessible(false);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        m_TextPaint.setColor(color);
    }

定义礼物的实体类

public class GiftSendModel {

    private int giftCount;
    private String userAvatarRes;
    private String nickname;
    private String sig;
    private int giftRes;
    private String gift_id;
    private int star;

    public GiftSendModel(int giftCount) {
        this.giftCount = giftCount;
    }

    public int getGiftCount() {
        return giftCount;
    }

    public void setGiftCount(int giftCount) {
        this.giftCount = giftCount;
    }
    ......

封装整体布局

public class GiftFrameLayout extends FrameLayout {

    private LayoutInflater mInflater;

    RelativeLayout anim_rl;
    ImageView anim_gift, anim_light, anim_header;
    TextView anim_nickname, anim_sign;
    StrokeTextView anim_num;

    /**
     * 礼物数量的起始值
     */
    int starNum = 1;
    int repeatCount = 0;
    private boolean isShowing = false;

    public GiftFrameLayout(Context context) {
        this(context, null);
    }

    public GiftFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        mInflater = LayoutInflater.from(context);
        initView();
    }


    private void initView() {
        View view = mInflater.inflate(R.layout.animation, this, false);
        anim_rl = (RelativeLayout) view.findViewById(R.id.animation_person_rl);
        anim_gift = (ImageView) view.findViewById(R.id.animation_gift);
        anim_light = (ImageView) view.findViewById(R.id.animation_light);
        anim_num = (StrokeTextView) view.findViewById(R.id.animation_num);
        anim_header = (ImageView) view.findViewById(R.id.gift_userheader_iv);
        anim_nickname = (TextView) view.findViewById(R.id.gift_usernickname_tv);
        anim_sign = (TextView) view.findViewById(R.id.gift_usersign_tv);
        this.addView(view);
    }

    public void hideView() {
        anim_gift.setVisibility(INVISIBLE);
        anim_light.setVisibility(INVISIBLE);
        anim_num.setVisibility(INVISIBLE);
    }

    public void setModel(GiftSendModel model){
        if (0!=model.getGiftCount()) {
            this.repeatCount = model.getGiftCount();
        }
        if (!TextUtils.isEmpty(model.getNickname())) {
            anim_nickname.setText(model.getNickname());
        }
        if (!TextUtils.isEmpty(model.getSig())) {
            anim_sign.setText(model.getSig());
        }
    }

    public boolean isShowing(){
        return isShowing;
    }
     public AnimatorSet startAnimation( final int repeatCount) {
        hideView();
        //布局飞入
        ObjectAnimator flyFromLtoR = GiftAnimationUtil.createFlyFromLtoR(anim_rl, -getWidth(), 0, 400,new OvershootInterpolator());
        flyFromLtoR.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationStart(Animator animation) {
                super.onAnimationStart(animation);
                GiftFrameLayout.this.setVisibility(View.VISIBLE);
                GiftFrameLayout.this.setAlpha(1f);
                isShowing = true;
                anim_num.setText("x " + 1);
                Log.i("TAG", "flyFromLtoR A start");
            }
        });
        //礼物飞入
        ObjectAnimator flyFromLtoR2 = GiftAnimationUtil.createFlyFromLtoR(anim_gift, -getWidth(), 0, 400,new DecelerateInterpolator());
        flyFromLtoR2.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationStart(Animator animation) {
                anim_gift.setVisibility(View.VISIBLE);
            }

            @Override
            public void onAnimationEnd(Animator animation) {
                    GiftAnimationUtil.startAnimationDrawable(anim_light);
                     anim_num.setVisibility(View.VISIBLE);
            }
        });
        //数量增加
        ObjectAnimator scaleGiftNum = GiftAnimationUtil.scaleGiftNum(anim_num, repeatCount);
        scaleGiftNum.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationRepeat(Animator animation) {
                anim_num.setText("x " + (++starNum));
            }
        });
        //向上渐变消失
        ObjectAnimator fadeAnimator = GiftAnimationUtil.createFadeAnimator(GiftFrameLayout.this, 0, -100, 300, 400);
        fadeAnimator.addListener(new AnimatorListenerAdapter() {

            @Override
            public void onAnimationEnd(Animator animation) {
                GiftFrameLayout.this.setVisibility(View.INVISIBLE);
            }
        });
        // 复原
        ObjectAnimator fadeAnimator2 = GiftAnimationUtil.createFadeAnimator(GiftFrameLayout.this, 100, 0, 20, 0);

        AnimatorSet animatorSet = GiftAnimationUtil.startAnimation(flyFromLtoR, flyFromLtoR2, scaleGiftNum, fadeAnimator, fadeAnimator2);
        animatorSet.addListener(new AnimatorListenerAdapter() {

            @Override
            public void onAnimationEnd(Animator animation) {
                starNum = 1;
                isShowing = false;
            }

        });
        return animatorSet;

我们将所有的动画方法都写到了GiftAnimationUtil中便于管理

public class GiftAnimationUtil {


    /**
     * @param target
     * @param star         动画起始坐标
     * @param end          动画终止坐标
     * @param duration     持续时间
     * @return
     * 创建一个从左到右的飞入动画
     * 礼物飞入动画
     */
    public  static ObjectAnimator createFlyFromLtoR(final View target, float star, float end, int duration, TimeInterpolator interpolator) {
        //1.个人信息先飞出来
        ObjectAnimator anim1 = ObjectAnimator.ofFloat(target, "translationX",
                star, end);
        anim1.setInterpolator(interpolator);
        anim1.setDuration(duration);
        return  anim1;
    }


    /**
     * @param target
     * @return
     * 播放帧动画
     */
    public static AnimationDrawable startAnimationDrawable(ImageView target){
        AnimationDrawable animationDrawable = (AnimationDrawable) target.getDrawable();
        if(animationDrawable!=null) {
            target.setVisibility(View.VISIBLE);
            animationDrawable.start();
        }
        return animationDrawable;
    }


    /**
     * @param target
     * @param drawable
     * 设置帧动画
     */
    public static void  setAnimationDrawable(ImageView target, AnimationDrawable drawable){

        target.setBackground(drawable);
    }

    /**
     * @param target
     * @param num
     * @return
     * 送礼数字变化
     */
    public static ObjectAnimator scaleGiftNum(final TextView target , int num){
        PropertyValuesHolder anim4 = PropertyValuesHolder.ofFloat("scaleX",
                1.7f, 0.8f,1f);
        PropertyValuesHolder anim5 = PropertyValuesHolder.ofFloat("scaleY",
                1.7f, 0.8f,1f);
        PropertyValuesHolder anim6 = PropertyValuesHolder.ofFloat("alpha",
                1.0f, 0f,1f);
        ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(target, anim4, anim5, anim6).setDuration(480);
        animator.setRepeatCount(num);
        return animator;

    }

    /**
     * @param target
     * @param star
     * @param end
     * @param duration
     * @param startDelay
     * @return
     * 向上飞 淡出
     */
    public static ObjectAnimator createFadeAnimator(final View target, float star, float end, int duration, int startDelay){

        PropertyValuesHolder translationY = PropertyValuesHolder.ofFloat("translationY", star,end);
        PropertyValuesHolder alpha = PropertyValuesHolder.ofFloat("alpha", 1.0f,0f);
        ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(target, translationY, alpha);
        animator.setStartDelay(startDelay);
        animator.setDuration(duration);
        return animator;
    }


    /**
     * @param animators
     * @return
     * 按顺序播放动画
     */
    public static AnimatorSet startAnimation(ObjectAnimator animator1, ObjectAnimator animator2, ObjectAnimator animator3, ObjectAnimator animator4, ObjectAnimator animator5){
        AnimatorSet animSet = new AnimatorSet();
//        animSet.playSequentially(animators);
        animSet.play(animator1).before(animator2);
        animSet.play(animator3).after(animator2);
        animSet.play(animator4).after(animator3);
        animSet.play(animator5).after(animator4);
        animSet.start();
        return animSet;
    }

}

所有的动画效果均是用属性动画完成，其中不仅有单个的动画，还有组合动画。属性动画用起来方面而且功能十分强大！

最后看下MainActivity中的实现

public class MainActivity extends AppCompatActivity {

    private GiftFrameLayout giftFrameLayout1;
    private GiftFrameLayout giftFrameLayout2;

    List<GiftSendModel> giftSendModelList = new ArrayList<GiftSendModel>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         giftFrameLayout1 = (GiftFrameLayout) findViewById(R.id.gift_layout1);
         giftFrameLayout2 = (GiftFrameLayout) findViewById(R.id.gift_layout2);

        findViewById(R.id.action).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                starGiftAnimation(createGiftSendModel());
            }
        });

    }


    private GiftSendModel createGiftSendModel(){
            return new GiftSendModel((int)(Math.random()*10));
    }

    private void starGiftAnimation(GiftSendModel model){
        if (!giftFrameLayout1.isShowing()) {
            sendGiftAnimation(giftFrameLayout1,model);
        }else if(!giftFrameLayout2.isShowing()){
            sendGiftAnimation(giftFrameLayout2,model);
        }else{
            giftSendModelList.add(model);
        }
    }


    private void sendGiftAnimation(final GiftFrameLayout view, GiftSendModel model){
        view.setModel(model);
        AnimatorSet animatorSet = view.startAnimation(model.getGiftCount());
        animatorSet.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                super.onAnimationEnd(animation);
                synchronized (giftSendModelList) {
                    if (giftSendModelList.size() > 0) {
                        view.startAnimation(giftSendModelList.get(giftSendModelList.size() - 1).getGiftCount());
                        giftSendModelList.remove(giftSendModelList.size() - 1);
                    }
                }
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

其中关于缓存区的策略大家可以根据实际需求进行定制。

Demo地址