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I've been working on an app that I published to the play store yesterday, but when I reopened it this morning to make some changes, there's lots of errors in the AndroidManifest.xml, activity_main.xml & styles.xml files.

Edit: Here's the files & errors

activity_main.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"
 tools:context=".MainActivity">

<WebView
 android:id="@+id/the_wv"
 android:layout_width="0dp"
 android:layout_height="0dp"
 app:layout_constraintBottom_toBottomOf="parent"
 app:layout_constraintEnd_toEndOf="parent"
 app:layout_constraintHorizontal_bias="0.5"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

Errors:

• Lines 2, 3 & 4: URI is not registered




• Lines 5, 6 & 7: attribute:xxxx is not allowed here




• Line 9: Element WebView is not allowed here

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>
 <item name="android:statusBarColor">@color/mainColor</item>
 </style>

</resources>

Errors:

• Lines 6-9: Cannot resolve symbol 'xxxxxx'

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.appname">

 <application
 android:allowBackup="true"
 android:icon="@mipmap/ic_launcher"
 android:label="@string/app_name"
 android:roundIcon="@mipmap/ic_launcher_round"
 android:supportsRtl="true"
 android:theme="@style/AppTheme">
 <activity
 android:screenOrientation="portrait"
 android:name=".MainActivity">
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />

 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
 </application>

</manifest>

Errors:

• Line 2: URI is not registered




• Lines 6, 7, 9, 10, 11 & 13: Attribute xxxxxx is not allowed here




• Line 14: Unresolved class 'MainActivity'

Any ideas why it might be throwing all these errors all of a sudden?

Clean your project and rebuild again using this steps:

Step 1: Build -> Clean Project

Step 2: Build -> Rebuild project

You can try invalidating Android Studio cache.

File -> Invalidate Caches / Restart -> Invalidate & Restart