I recently did animation of a similar kind using Animators. In general, views will not display themselves outside of their parents' boundaries, the view will be cut by it's parent's boundaries. That's why, the trick is to place a new view (shuttleView) on top of the origin view (fromView) that you want to animate, align them, and animate scaling/translation of shuttleView into a target view (toView).
This solution supports both scaling and translation, here is sample: https://www.dropbox.com/s/iom95o93076h52f/device-2016-06-03-111557.mp4?dl=0
Here is the code:
activity_main.xml
<LinearLayout
android:layout_width="match_parent"
android:layout_height="90dp"
android:layout_alignParentTop="true"
android:background="@android:color/holo_blue_dark">
<TextView
android:id="@+id/itemTo"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_margin="10dp"
android:background="@android:color/holo_blue_bright"
android:text="to"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="90dp"
android:layout_alignParentBottom="true"
android:background="@android:color/holo_blue_dark">
<TextView
android:layout_width="90dp"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:background="@android:color/holo_blue_bright" />
<TextView
android:id="@+id/itemFrom"
android:layout_width="90dp"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:text="from"
android:background="@android:color/holo_blue_bright" />
<TextView
android:layout_width="90dp"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:background="@android:color/holo_blue_bright" />
</LinearLayout>
<View
android:id="@+id/shuttle"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@android:color/holo_blue_bright"/>
Activity class:
public class MainActivity extends AppCompatActivity {
public static final int ANIMATION_SPEED = 3000;
private RelativeLayout rootView;
private View fromView, toView, shuttleView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rootView = (RelativeLayout) findViewById(R.id.rootView);
fromView = findViewById(R.id.itemFrom);
toView = findViewById(R.id.itemTo);
shuttleView = findViewById(R.id.shuttle);
fromView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Rect fromRect = new Rect();
Rect toRect = new Rect();
fromView.getGlobalVisibleRect(fromRect);
toView.getGlobalVisibleRect(toRect);
AnimatorSet animatorSet = getViewToViewScalingAnimator(rootView, shuttleView, fromRect, toRect, ANIMATION_SPEED, 0);
animatorSet.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
shuttleView.setVisibility(View.VISIBLE);
fromView.setVisibility(View.INVISIBLE);
}
@Override
public void onAnimationEnd(Animator animation) {
shuttleView.setVisibility(View.GONE);
fromView.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
animatorSet.start();
}
});
}
public static AnimatorSet getViewToViewScalingAnimator(final RelativeLayout parentView,
final View viewToAnimate,
final Rect fromViewRect,
final Rect toViewRect,
final long duration,
final long startDelay) {
// get all coordinates at once
final Rect parentViewRect = new Rect(), viewToAnimateRect = new Rect();
parentView.getGlobalVisibleRect(parentViewRect);
viewToAnimate.getGlobalVisibleRect(viewToAnimateRect);
viewToAnimate.setScaleX(1f);
viewToAnimate.setScaleY(1f);
// rescaling of the object on X-axis
final ValueAnimator valueAnimatorWidth = ValueAnimator.ofInt(fromViewRect.width(), toViewRect.width());
valueAnimatorWidth.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
// Get animated width value update
int newWidth = (int) valueAnimatorWidth.getAnimatedValue();
// Get and update LayoutParams of the animated view
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) viewToAnimate.getLayoutParams();
lp.width = newWidth;
viewToAnimate.setLayoutParams(lp);
}
});
// rescaling of the object on Y-axis
final ValueAnimator valueAnimatorHeight = ValueAnimator.ofInt(fromViewRect.height(), toViewRect.height());
valueAnimatorHeight.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
// Get animated width value update
int newHeight = (int) valueAnimatorHeight.getAnimatedValue();
// Get and update LayoutParams of the animated view
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) viewToAnimate.getLayoutParams();
lp.height = newHeight;
viewToAnimate.setLayoutParams(lp);
}
});
// moving of the object on X-axis
ObjectAnimator translateAnimatorX = ObjectAnimator.ofFloat(viewToAnimate, "X", fromViewRect.left - parentViewRect.left, toViewRect.left - parentViewRect.left);
// moving of the object on Y-axis
ObjectAnimator translateAnimatorY = ObjectAnimator.ofFloat(viewToAnimate, "Y", fromViewRect.top - parentViewRect.top, toViewRect.top - parentViewRect.top);
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.setInterpolator(new DecelerateInterpolator(1f));
animatorSet.setDuration(duration); // can be decoupled for each animator separately
animatorSet.setStartDelay(startDelay); // can be decoupled for each animator separately
animatorSet.playTogether(valueAnimatorWidth, valueAnimatorHeight, translateAnimatorX, translateAnimatorY);
return animatorSet;
}
}
You can do a whole bunch of customizations in terms of what appears and disappears at different stages of animation in animatorSet listener. Hope it's helpful.
