java - Constraint layout margins keep changing -


the margins of left button keep changing can see in video , them not change.

i doing calculator , want move buttons togheter without changing margins.

the video there: https://youtu.be/ut3zinpamhy

here code:

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.constraintlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/activity_main"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context="com.a3ibm.calculator.mainactivity">       <button         android:id="@+id/button"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="button"         app:layout_constraintbaseline_tobaselineof="@+id/button2"         app:layout_constraintright_toleftof="@+id/button2"         android:layout_marginright="86dp" />      <button         android:id="@+id/button2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="button"         app:layout_constraintleft_toleftof="parent"         app:layout_constrainttop_totopof="parent"         app:layout_constraintbottom_tobottomof="parent"         app:layout_constraintright_torightof="parent"         app:layout_constrainthorizontal_bias="0.864"         app:layout_constraintvertical_bias="0.319" /> </android.support.constraint.constraintlayout>

here possible solution want. problem centering:

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.constraintlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/activity_main"     android:layout_width="match_parent"     android:layout_height="match_parent">       <button         android:id="@+id/button"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="button"         app:layout_constraintend_tostartof="@+id/button2"         android:layout_marginend="56dp"         android:layout_marginright="56dp"         app:layout_constrainttop_totopof="@+id/button2"         app:layout_constraintbottom_tobottomof="@+id/button2"         app:layout_constraintvertical_bias="0.0" />      <button         android:id="@+id/button2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="button"         tools:layout_editor_absolutey="186dp"         tools:layout_editor_absolutex="208dp" /> </android.support.constraint.constraintlayout>

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