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I have found several duplicate questions. I'm having exactly the same problem:

• Android Studio | How do I scale the image in ToggleButton?




• Android Toggle Button distorted view

However, their problems haven't been solved yet so I just want to ask a new question again. So the third one on the left is what the second is supposed to be.
The second button is a custom toggle button, the idea of which comes from here: Android: Create a toggle button with image and no text
And I place these buttons in a horizontal LinearLayout.

This is the xml of that part:

<LinearLayout
 android:id="@+id/post_button_layout"
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:layout_marginStart="8dp"
 android:layout_marginTop="8dp"
 android:layout_marginEnd="8dp"
 android:layout_marginBottom="8dp"
 android:orientation="horizontal"
 android:padding="16dp"
 app:layout_constraintBottom_toBottomOf="parent"
 app:layout_constraintEnd_toEndOf="@+id/post_content"
 app:layout_constraintHorizontal_bias="0.807"
 app:layout_constraintStart_toStartOf="@+id/post_content"
 app:layout_constraintTop_toBottomOf="@+id/post_divider2">

 <ImageButton
 android:id="@+id/post_comment"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@android:drawable/screen_background_light_transparent"
 app:srcCompat="@drawable/ic_comment"
 tools:layout_editor_absoluteX="37dp"
 tools:layout_editor_absoluteY="500dp" />

 <ToggleButton
 android:id="@+id/toggleButton"
 style="@style/CollectToggle"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@drawable/ic_collect_toggle_bg"/>

 <ImageButton
 android:id="@+id/post_collect"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@android:drawable/screen_background_light_transparent"
 app:srcCompat="@drawable/ic_collection"
 tools:layout_editor_absoluteX="288dp"
 tools:layout_editor_absoluteY="508dp" />

 <ImageButton
 android:id="@+id/post_share"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@android:drawable/screen_background_light_transparent"
 app:srcCompat="@drawable/ic_share"
 tools:layout_editor_absoluteX="104dp"
 tools:layout_editor_absoluteY="508dp" />

</LinearLayout>