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我试图使用按钮在我现有的editText字段下动态添加editText字段.目前按下按钮什么都不做.这是我的代码:

XML:

<?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"
android:background="#d4cfcd">
tools:context="com.zdowning.decisionmaker.MainActivity">


<LinearLayout
    android:id="@+id/linearLayoutMain"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:gravity="center"
        android:hint="Enter Your Question Here"
        android:layout_marginBottom="20dp"
        android:layout_marginTop="20dp"/>

    <LinearLayout
        android:id="@+id/linearLayoutDecisions"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

    <EditText
        android:id="@+id/editText3"
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:gravity="center"
        android:hint="Enter Answer #2" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:gravity="center"
        android:hint="Enter Answer #1" />

    <EditText
        android:id="@+id/editText4"
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:gravity="center"
        android:hint="Enter Answer #3" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center">

        <Button
            android:id="@+id/add_button"
            style="?android:attr/borderlessButtonStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@color/colorPrimary"
            android:text="+"
            android:textColor="@android:color/background_light"
            android:textSize="18sp"/>

        <View …