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.NET for Android provides open-source bindings of the Android SDK for use with .NET managed languages such as C#
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An Android layout file build failed, but in Android Studio it works fine. #2083

Closed yorkvolvo closed 6 years ago

yorkvolvo commented 6 years ago

Steps to Reproduce

  1. Create a blank Xamarin.Android project
  2. Create an Android Layout file under layout folder.
  3. Add the following content in this file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minWidth="25px"
    android:minHeight="25px">
  <Button
      android:id="@+id/button1"
      android:text="Button"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"
      android:layout_below="@id/textView1" />
  <TextView
      android:id="@+id/textView1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:text="Hello World" />
</RelativeLayout>
  1. Build this project.

Expected Behavior

Build success, without any error.

Actual Behavior

Build failed with the following erro:

1>------ Rebuild All started: Project: SingleButton, Configuration: Debug Any CPU ------
1>C:\workspace\XAndroid\SingleButton\SingleButton\Properties\AndroidManifest.xml : warning XA0101: @(Content) build action is not supported
1>C:\workspace\XAndroid\SingleButton\SingleButton\Resources\layout\layout1.axml(2): error APT0000: No resource found that matches the given name (at 'layout_below' with value '@id/textView1').
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

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Log File

1>------ Rebuild All started: Project: SingleButton, Configuration: Debug Any CPU ------
1>C:\workspace\XAndroid\SingleButton\SingleButton\Properties\AndroidManifest.xml : warning XA0101: @(Content) build action is not supported
1>C:\workspace\XAndroid\SingleButton\SingleButton\Resources\layout\layout1.axml(2): error APT0000: No resource found that matches the given name (at 'layout_below' with value '@id/textView1').
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========
JonDouglas commented 6 years ago

Thanks for filing the report!

There are two issues here.

  1. One of your files has the Build Action of Content instead of AndroidResource.
  2. There does not exist a resource of @id/textView1 because it is on the last element in the XML/AXML file. You can read my comment here about this further: https://stackoverflow.com/questions/51842519/order-of-elements-in-axml-in-xamarin-android-leads-to-compilation-error#comment90652095_51842519

The reason why this works in Android Studio is that it uses aapt2 by default. If you were to disable this manually, you would run into the same issue:

i.e. in gradle.properties set:

android.enableAapt2=false

We do however support aapt2 which you can enable in your project by adding the following in your .csproj:

<AndroidUseAapt2>True</AndroidUseAapt2>