如何设置imageview的动画,使其向上移动到另一个视图,然后再次返回到原始位置

我想动画一个图像视图的方式,它开始从它的初始位置移动到一个按钮(向上移动图像视图),然后再次回到它的初始位置,这将无限重复。我对动画很陌生,所以请指导我怎么做?

我的layout.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".fragment.Scratch1Fragment">

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button
            android:id="@+id/btn_scratch_now"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            style="@style/buttonStyle"
            android:text="@string/str_scratch_now"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintVertical_bias="0.2"/>

        <View
            android:id="@+id/upper_bound"
            android:layout_width="match_parent"
            android:layout_height="2dp"
            android:background="@color/primary"
            android:layout_marginEnd="10dp"
            android:layout_marginStart="10dp"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintVertical_bias="0.5"/>

        <TextView
            android:id="@+id/text_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/str_scratch"
            style="@style/tvDarkLargeStyle"
            android:gravity="center"
            android:textAlignment="center"
            app:layout_constraintTop_toBottomOf="@+id/upper_bound"
            />

        <View
            android:id="@+id/lower_bound"
            android:layout_width="match_parent"
            android:layout_height="2dp"
            android:background="@color/primary"
            android:layout_marginEnd="10dp"
            android:layout_marginStart="10dp"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/text_view"
            />

        <TextView
            android:id="@+id/tv_tap_here"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toBottomOf="@id/lower_bound"
            android:layout_margin="20dp"
            android:padding="10dp"
            android:gravity="center"
            style="@style/tvLightLargeStyle"
            android:textAlignment="center"
            android:text="Tap here"/>

        <ImageView
            android:id="@+id/img_hand"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/clicker_hand_64"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintBottom_toBottomOf="@+id/upper_bound"/>

    </android.support.constraint.ConstraintLayout>

</FrameLayout>

如果我的问题听起来不清楚,请随时询问更多代码或更多细节。

更新

在获得一些资源后,我开始尝试,我发现下面的代码。但不知怎么的,我无法得到按钮浮动的位置(它总是返回0)。

我的代码如下:

private void animate() {
    Log.e("button top", String.valueOf(btnScratch.getTop()));

    int location[] = new int[2];
    btnScratch.getLocationOnScreen(location);
    Log.e("button location x and y",location[0]+" "+location[1]);

    int location2[] = new int[2];
    imgHand.getLocationOnScreen(location2);
    Log.e("image location x and y",location2[0]+" "+location2[1]);

    ValueAnimator valueAnimator = ValueAnimator.ofFloat(0f, btnScratch.getTop());
    valueAnimator.setInterpolator(new AccelerateDecelerateInterpolator()); // increase the speed first and then decrease
    valueAnimator.setDuration(1000);
    valueAnimator.setRepeatCount(ValueAnimator.INFINITE);
    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            float progress = (float) animation.getAnimatedValue();
            imgHand.setTranslationY(progress);
            // no need to use invalidate() as it is already present in             //the text view.
        }
    });
    valueAnimator.start();
}

我也试过同样的方法 ObjectAnimatior 而不是 ValueAnimator .但没用。