Android自定义view实现仿抖音点赞效果

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我是靠谱客的博主俊逸航空，最近开发中收集的这篇文章主要介绍Android自定义view实现仿抖音点赞效果，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

前言

学习自定义view，想找点东西耍一下，刚好看到抖音的点赞效果不错，尝试一下。

抖音效果：

话不多说，先上代码：

public class Love extends RelativeLayout {
  private Context mContext;
  float[] num = {-30, -20, 0, 20, 30};//随机心形图片角度
  public Love(Context context) {
    super(context);
    initView(context);
  }
  public Love(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    initView(context);
  }
  public Love(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    initView(context);
  }
  private void initView(Context context) {
    mContext = context;
  }
  @Override
  protected void dispatchDraw(Canvas canvas) {
    super.dispatchDraw(canvas);
    ImageView imageView = new ImageView(mContext);
    LayoutParams params = new LayoutParams(100, 100);
    params.leftMargin = getWidth() - 200;
    params.topMargin = getHeight() / 2 - 300;
    imageView.setImageDrawable(getResources().getDrawable(R.drawable.heart_red));
    imageView.setLayoutParams(params);
    addView(imageView);
    imageView.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        Toast.makeText(mContext, "这里是点击爱心的动画，待展示", Toast.LENGTH_SHORT).show();
      }
    });
  }
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    final ImageView imageView = new ImageView(mContext);
    LayoutParams params = new LayoutParams(300, 300);
    params.leftMargin = (int) event.getX() - 150;
    params.topMargin = (int) event.getY() - 300;
    imageView.setImageDrawable(getResources().getDrawable(R.drawable.heart_red));
    imageView.setLayoutParams(params);
    addView(imageView);
    AnimatorSet animatorSet = new AnimatorSet();
    animatorSet.play(scale(imageView, "scaleX", 2f, 0.9f, 100, 0))
        .with(scale(imageView, "scaleY", 2f, 0.9f, 100, 0))
        .with(rotation(imageView, 0, 0, num[new Random().nextInt(4)]))
        .with(alpha(imageView, 0, 1, 100, 0))
        .with(scale(imageView, "scaleX", 0.9f, 1, 50, 150))
        .with(scale(imageView, "scaleY", 0.9f, 1, 50, 150))
        .with(translationY(imageView, 0, -600, 800, 400))
        .with(alpha(imageView, 1, 0, 300, 400))
        .with(scale(imageView, "scaleX", 1, 3f, 700, 400))
        .with(scale(imageView, "scaleY", 1, 3f, 700, 400));
    animatorSet.start();
    animatorSet.addListener(new AnimatorListenerAdapter() {
      @Override
      public void onAnimationEnd(Animator animation) {
        super.onAnimationEnd(animation);
        removeViewInLayout(imageView);
      }
    });
    return super.onTouchEvent(event);
  }
  public static ObjectAnimator scale(View view, String propertyName, float from, float to, long time, long delayTime) {
    ObjectAnimator translation = ObjectAnimator.ofFloat(view
        , propertyName
        , from, to);
    translation.setInterpolator(new LinearInterpolator());
    translation.setStartDelay(delayTime);
    translation.setDuration(time);
    return translation;
  }
  public static ObjectAnimator translationX(View view, float from, float to, long time, long delayTime) {
    ObjectAnimator translation = ObjectAnimator.ofFloat(view
        , "translationX"
        , from, to);
    translation.setInterpolator(new LinearInterpolator());
    translation.setStartDelay(delayTime);
    translation.setDuration(time);
    return translation;
  }
  public static ObjectAnimator translationY(View view, float from, float to, long time, long delayTime) {
    ObjectAnimator translation = ObjectAnimator.ofFloat(view
        , "translationY"
        , from, to);
    translation.setInterpolator(new LinearInterpolator());
    translation.setStartDelay(delayTime);
    translation.setDuration(time);
    return translation;
  }
  public static ObjectAnimator alpha(View view, float from, float to, long time, long delayTime) {
    ObjectAnimator translation = ObjectAnimator.ofFloat(view
        , "alpha"
        , from, to);
    translation.setInterpolator(new LinearInterpolator());
    translation.setStartDelay(delayTime);
    translation.setDuration(time);
    return translation;
  }
  public static ObjectAnimator rotation(View view, long time, long delayTime, float... values) {
    ObjectAnimator rotation = ObjectAnimator.ofFloat(view, "rotation", values);
    rotation.setDuration(time);
    rotation.setStartDelay(delayTime);
    rotation.setInterpolator(new TimeInterpolator() {
      @Override
      public float getInterpolation(float input) {
        return input;
      }
    });
    return rotation;
  }
  }

实现思路

在点击时触发将心形的图片add到整个view中，然后在执行动画。主要的处理逻辑都在onTouchEvent()事件中，下面我们来详细讲解一下思路和代码：

@Override
  public boolean onTouchEvent(MotionEvent event) {
    final ImageView imageView = new ImageView(mContext);
    LayoutParams params = new LayoutParams(300, 300);
    params.leftMargin = (int) event.getX() - 150;
    params.topMargin = (int) event.getY() - 300;
    imageView.setImageDrawable(getResources().getDrawable(R.drawable.heart_red));
    imageView.setLayoutParams(params);
    addView(imageView);
    AnimatorSet animatorSet = new AnimatorSet();
    animatorSet.play(scale(imageView, "scaleX", 2f, 0.9f, 100, 0))
        .with(scale(imageView, "scaleY", 2f, 0.9f, 100, 0))
        .with(rotation(imageView, 0, 0, num[new Random().nextInt(4)]))
        .with(alpha(imageView, 0, 1, 100, 0))
        .with(scale(imageView, "scaleX", 0.9f, 1, 50, 150))
        .with(scale(imageView, "scaleY", 0.9f, 1, 50, 150))
        .with(translationY(imageView, 0, -600, 800, 400))
        .with(alpha(imageView, 1, 0, 300, 400))
        .with(scale(imageView, "scaleX", 1, 3f, 700, 400))
        .with(scale(imageView, "scaleY", 1, 3f, 700, 400));
    animatorSet.start();
    animatorSet.addListener(new AnimatorListenerAdapter() {
      @Override
      public void onAnimationEnd(Animator animation) {
        super.onAnimationEnd(animation);
        removeViewInLayout(imageView);
      }
    });
    return super.onTouchEvent(event);
  }

•首先，我们需要在触摸事件中做监听，当有触摸时，创建一个展示心形图片的ImageView。

final ImageView imageView = new ImageView(mContext);
  imageView.setImageDrawable(getResources().getDrawable(R.drawable.heart_red));//设置红色心形图片

•设置图片展示的位置，是需要在手指触摸的位置上方，即触摸点是心形的下方角的位置。所以我们需要将ImageView设置到手指的位置

 LayoutParams params = new LayoutParams(300, 300);
 params.leftMargin = (int) event.getX() - 150;
 params.topMargin = (int) event.getY() - 300;
 imageView.setLayoutParams(params);

•给imageView add到父view中。

addView(imageView);

•设置imageView动画

 AnimatorSet animatorSet = new AnimatorSet();
 animatorSet.play(scale(imageView, "scaleX", 2f, 0.9f, 100, 0))//缩放动画，X轴2倍缩小至0.9倍
        .with(scale(imageView, "scaleY", 2f, 0.9f, 100, 0))//缩放动画，Y轴2倍缩小至0.9倍
        .with(rotation(imageView, 0, 0, num[new Random().nextInt(4)]))//旋转动画，随机旋转角度num={-30.-20，0，20，30}
        .with(alpha(imageView, 0, 1, 100, 0))//渐变透明度动画，透明度从0-1.
        .with(scale(imageView, "scaleX", 0.9f, 1, 50, 150))//缩放动画，X轴0.9倍缩小至1倍
        .with(scale(imageView, "scaleY", 0.9f, 1, 50, 150))//缩放动画，Y轴0.9倍缩小至1倍
        .with(translationY(imageView, 0, -600, 800, 400))//平移动画，Y轴从0向上移动600单位
        .with(alpha(imageView, 1, 0, 300, 400))//透明度动画，从1-0
        .with(scale(imageView, "scaleX", 1, 3f, 700, 400))//缩放动画，X轴1倍放大至3倍
        .with(scale(imageView, "scaleY", 1, 3f, 700, 400));//缩放动画，Y轴1倍放大至3倍
animatorSet.start();

•当然，我们不可能无限制的增加view，在view消失之后，需要手动的移除改ImageView。

animatorSet.addListener(new AnimatorListenerAdapter() {
      @Override
      public void onAnimationEnd(Animator animation) {
        super.onAnimationEnd(animation);
        removeViewInLayout(imageView);
      }
    });

效果如下：