固定大小的textview水平居中在xml中起作用，但不能以编程方式

Question

我的要求是在LinearLayout / RelativeLayout内部具有动态TextView，以模仿“打包”链样式在约束布局中的工作方式，而不会传播。
通过我的尝试，它仅在通过XML添加TextViews时有效，而在以编程方式添加TextViews时则无效。 xml代码

<?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:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="@layout/app_bar_main">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    app:layout_constraintBottom_toBottomOf="@id/answer_container"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
    android:id="@+id/answer_container"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="2dp"
    android:background="@android:color/darker_gray"
    android:gravity="center"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    >
    <TextView
        android:id="@+id/tv1"
        style="@style/App_SquareTvStyle" />
    <TextView
        android:id="@+id/tv2"
        style="@style/App_SquareTvStyle" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>

normal_tv.xml（布局）

<?xml version="1.0" encoding="utf-8"?>
<TextView android:layout_width="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    style="@style/App_SquareTvStyle"
    xmlns:android="http://schemas.android.com/apk/res/android" />

styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="AppTheme.NoActionBar">
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
    </style>

    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />

    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
    <style name="App_SquareTvStyle" parent="Widget.AppCompat.TextView.SpinnerItem">
        <item name="android:layout_height">64dp</item> <!--for square-->
        <item name="android:layout_width">64dp</item> <!--for square-->
        <item name="android:text">1</item>
        <item name="android:maxLines">1</item>
        <item name="android:gravity">center</item>
        <item name="android:textSize">16dp</item>
        <item name="android:layout_margin">4dp</item>
        <item name="android:autoSizeMaxTextSize">16dp</item>
        <item name="android:autoSizeMinTextSize">6dp</item>
        <item name="android:autoSizeStepGranularity">0.5sp</item>
        <item name="android:autoSizeTextType">uniform</item>
        <item name="android:background">@drawable/cell_borders</item>
        <item name="android:textColor">@android:color/white</item>
    </style>
</resources>

MainActivity

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        answer_container = (LinearLayout) findViewById(R.id.answer_container);

     int pos;
        // following code overlaps subsequent textviews and  
    // finally only one textview is visble in center, 
    // but getChildCount returns 4
        for(int i=12;i<=15;i++){
            Log.d(TAG, "loadAnswerFromCrossWord: "+ Integer.toString(i));
            //TextView tmp = new TextView(this);
            TextView tmp = (TextView) getLayoutInflater().inflate(R.layout.normal_tv, answer_container,false);
            int newId = View.generateViewId();
            tmp.setId(newId);
            tmp.setText(Integer.toString(i));
            pos=answer_container.getChildCount();
            answer_container.addView(tmp,pos);
        }
}

截屏xml文本视图和动态文本视图