Android TextInputField Inflator Error

This happened to me as well, and I came up with a solution that does not require changing the App Theme, but merely changing the Theme of the TextInputLayout:

<android.support.design.widget.TextInputLayout
    android:id="@+id/testingInputLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/Theme.AppCompat">

   <EditText
       android:id="@+id/testingEditText"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:hint="@string/testText"
       android:inputType="textEmailAddress" />

</android.support.design.widget.TextInputLayout>

You will need to add the appCompat library if you have not already:

compile 'com.android.support:appcompat-v7:23.0.1'

Make sure you have the following dependencies in your gradle file:

compile 'com.android.support:appcompat-v7:22.2.0'
compile 'com.android.support:design:22.2.0'

Working example:

<android.support.design.widget.TextInputLayout
    android:id="@+id/txtEmail_InpLyt"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textEmailAddress"
        android:ems="10"
        android:id="@+id/txtEmail"
        android:hint="Email Address"
        android:singleLine="true"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"/>
</android.support.design.widget.TextInputLayout>

(Setting hintTextAppearance is not necessary.)

Update:

If you experience issues with the hint text not appearing in newer versions of Android (Marshmallow / Nougat), update library to version 22.2.1 (see TextInputLayout not showing EditText hint before user focus on it).

compile 'com.android.support:appcompat-v7:22.2.1'
compile 'com.android.support:design:22.2.1'