android - Center vector with animation -

i have vector i'm trying scale bigger after click on it, position in top left corner of viewport area want have in center, , animation should make bigger center of bottom. i'm using pivot doesn't help. code:

activity:

@override protected void oncreate(bundle savedinstancestate) {   super.oncreate(savedinstancestate);   setcontentview(r.layout.activity_baloon);   androidimageview = (imageview) findviewbyid(r.id.animated);   if (androidimageview != null) {     androidimageview.setonclicklistener(new view.onclicklistener() {       @override       public void onclick(view v) {         if (isbig) {           animatedown();           isbig = false;         } else {           animateup();           isbig = true;         }       }     });   } }  private void animateup() {   objectanimator scaledownx = objectanimator.offloat(androidimageview, "scalex", 1.5f);   objectanimator scaledowny = objectanimator.offloat(androidimageview, "scaley", 1.5f);    scaledownx.setduration(300);   scaledowny.setduration(300);    animatorset scaledown = new animatorset();     scaledown.play(scaledownx).with(scaledowny);   scaledown.start(); }  private void animatedown() {   objectanimator scaledownx = objectanimator.offloat(androidimageview, "scalex", 1.0f);   objectanimator scaledowny = objectanimator.offloat(androidimageview, "scaley", 1.0f);    scaledownx.setduration(300);   scaledowny.setduration(300);    animatorset scaledown = new animatorset();    scaledown.play(scaledownx).with(scaledowny);   scaledown.start(); } 

layout:

 <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"             xmlns:app="http://schemas.android.com/apk/res-auto"             android:orientation="vertical"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:background="@android:color/black"     > <relativelayout         android:layout_width="100dp"         android:layout_height="100dp"         android:layout_centerinparent="true"         android:background="@android:color/white"         >  <imageview             android:id="@+id/animated"             android:layout_width="100dp"             app:srccompat="@drawable/animated_baloon"             android:layout_height="100dp"             android:layout_centerinparent="true"             /> </relativelayout> 

vector:

<vector xmlns:android="http://schemas.android.com/apk/res/android"     android:height="48dp"     android:viewportheight="327.5"     android:viewportwidth="262.36"     android:width="48dp"      > <group         android:name="android"         android:pivotx="163.75"         android:pivoty="131.18"         >     <path             android:fillcolor="#fdc500"             android:pathdata="m-0.01,32.82a32.81,32.81 0,1 1,65.61 0c0,28.94 -32.8,49.04 -32.8,49.04s-0.01,61.77 -0.01,32.82z"             /> </group> 

you need use viewport height , width, not android:heightand width.

<vector xmlns:android="http://schemas.android.com/apk/res/android"     android:height="24dp"     android:viewportheight="81.875"     android:viewportwidth="32.795"     android:width="24dp"     >  <!--  <group name="dot_name"       pivotx="viewportheight / 2"       pivoty="viewportwidth / 2">  calculate values yourself, write calucalted values in there. moves reference point middle -->  <group name="dot_name"       pivotx="40.9375"       pivoty="viewportwidth / 2">    <path     android:fillcolor="#ff000000"     android:pathdata="m-0.01,32.82a32.81,32.81 0,1 1,65.61 0c0,28.94 -32.8,49.04 -32.8,49.04s-0.01,61.77 -0.01,32.82z" /> </group> </vector>