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：
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：
这里写图片描述
右侧爱心点赞的效果容我先搞出来，下期在上咯！
有问题和想法，欢迎私信或者评论留言，一起学习，一起进步
