Occasional NPE with PhoneAuth

[ArcherEmiya05]

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Step 1: Are you in the right place?

Yes

Step 2: Describe your environment

• Android device: Redmi 5A
• Android OS version: 8.0
• Google Play Services version: 4.3.5
• Firebase/Play Services SDK version: 20.0.4
• FirebaseUI version: 7.1.1

Step 3: Describe the problem:

Getting NPE sometimes after waiting to receive OTP with Firebase UI (phone auth)

Steps to reproduce:

I think this mostly happened after setting theme with MaterialComponent DayNight and setting forceDarkAllowed to false

Observed Results:

Fatal Exception: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.CharSequence android.view.inputmethod.InputConnection.getTextBeforeCursor(int, int)' on a null object reference
       at android.view.inputmethod.InputConnectionWrapper.getTextBeforeCursor(InputConnectionWrapper.java:79)
       at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:264)
       at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:89)
       at android.os.Handler.dispatchMessage(Handler.java:107)
       at android.os.Looper.loop(Looper.java:224)
       at android.app.ActivityThread.main(ActivityThread.java:7560)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)

Expected Results:

No error and crashes

Relevant Code:

<!--Override Firebase UI-->
  <style name="AuthStyle" parent="Theme.MaterialComponents.DayNight">

      <!--Override action bar and status bar-->
      <item name="colorAccent">@color/colorAccent</item>
      <item name="colorPrimary">@color/colorPrimary</item>
      <item name="colorPrimaryDark">@color/colorPrimaryDark</item>

      <item name="android:colorControlNormal">@color/colorAccent</item> <!--Spinner or non focus field underline color-->
      <item name="android:colorFocusedHighlight">@color/colorAccent</item>

      <!--Override Toolbar title text when using MaterialComponent-->
      <item name="toolbarStyle">@style/AppToolbar</item>

      <item name="materialButtonStyle">@style/AuthButton</item> <!--Customize Firebase UI button when using MaterialComponent-->

      <item name="android:windowBackground">@color/whitePrimaryDark</item>

      <!--Description text color-->
      <item name="android:textColorTertiary">@color/primaryDarkWhite</item>
<!--        <item name="android:textColorPrimary">@color/colorPrimary</item>-->

      <!--Override resend code text color-->
      <item name="android:textColorSecondary">?android:textColorTertiary</item> <!--This override spinner item text too when using MaterialComponent-->

      <item name="android:forceDarkAllowed" tools:targetApi="q">false</item>
  </style>

  <!--Extend MaterialComponent Button when using MaterialComponents as app main theme-->
  <style name="AuthButton" parent="Widget.MaterialComponents.Button">
      <item name="android:minHeight">48dip</item>
      <item name="android:minWidth">64dip</item>
      <item name="android:textStyle">bold</item>
      <item name="android:textColor">@color/whitePrimaryDark</item>
      <item name="materialThemeOverlay">@style/ThemeOverlay.App.Button</item>
  </style>

  <!--Override-->
  <style name="ThemeOverlay.App.Button" parent="">
      <item name="colorPrimary">@color/primaryDarkAccent</item>
      <item name="colorAccent">@color/primaryDarkAccent</item>
  </style>

  <!--Override-->
  <style name="FirebaseUI.TextInputEditText.PhoneField" tools:keep="@style/FirebaseUI_TextInputEditText_PhoneField">
      <item name="android:layout_width">match_parent</item>
      <item name="android:layout_height">wrap_content</item>
      <item name="android:textSize">14sp</item>
      <item name="android:inputType">number</item>
      <item name="android:textColor">?android:textColorTertiary</item>
      <item name="android:textColorHint">?android:textColorTertiary</item>
  </style>

  <!--Override-->
  <style name="FirebaseUI.CountrySpinner" tools:keep="@style/FirebaseUI_CountrySpinner">
      <item name="android:layout_width">wrap_content</item>
      <item name="android:layout_height">wrap_content</item>
      <item name="android:backgroundTint">@color/colorAccent</item> <!--Spinner underline and arrow color-->
      <item name="android:textColor">?android:textColorTertiary</item> <!--Spinner placeholder text color-->
  </style>
  <!--End of Overriding FirebaseUI-->

[weixifan]

Thank you for the report! I've filed an internal issue b/188591313 to track this.