Android studio 2.2 EditText Border - android-edittext

Question

I upgraded Android Studio 2.2 preview 3 recently but the EditText style changed， In preView:
But run on my phone, It like this:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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.hyh.newlearn.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
<EditText
android:id="#+id/et_show"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:hint="Hello World"/>
</RelativeLayout>
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>
</resources>
Why? How to deal with it?

Answer 1

buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.0-alpha3'
// classpath 'com.android.tools.build:gradle:1.5.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
If I use classpath 'com.android.tools.build:gradle:2.2.0-alpha3', it will show the error view.
If I use classpath 'classpath 'com.android.tools.build:gradle:1.5.0'', it will show the right view.

Answer 2

I have exaclty the same problem.
Yuhao, here is my question
android edittext on sdk version from 16-19 shown incorrectly.
but i thought it was couse of api.
You were right.
We have to use last stable version
'com.android.tools.build:gradle:2.1.0'