add errors

.gitignore

@@ -62,3 +62,5 @@ buck-out/
 # Expo
 .expo/*
 web-build/
+
+android/app/.cxx/

android/app/CMakeLists.txt

@@ -0,0 +1,49 @@
+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html
+
+# Sets the minimum version of CMake required to build the native library.
+
+cmake_minimum_required(VERSION 3.4.1)
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+
+set(build_DIR ${CMAKE_SOURCE_DIR}/build)
+set(PACKAGE_NAME "my_jni_module")
+
+    #THIS RESULTS IN AN ERROR:
+    #Could not find a package configuration file provided by "fbjni" with any of
+    #the following names:
+    #
+    #fbjniConfig.cmake
+    #fbjni-config.cmake
+    #
+    #Add the installation prefix of "fbjni" to CMAKE_PREFIX_PATH or set
+    #"fbjni_DIR" to a directory containing one of the above files.  If "fbjni"
+    #provides a separate development package or SDK, be sure it has been
+    #installed.
+#find_package(fbjni REQUIRED CONFIG)
+
+add_library( # Sets the name of the library.
+        ${PACKAGE_NAME}
+
+        # Sets the library as a shared library.
+        SHARED
+
+        # Provides a relative path to your source file(s).
+        ./src/cpp/sample.cpp
+        )
+
+target_link_libraries(${PACKAGE_NAME}
+#        fbjni::fbjni
+        android
+        log
+)
+
+#target_link_libraries(my_jni_module
+#                      android
+#                      log
+#                      fbjni::fbjni
+#)

android/app/build.gradle

@@ -123,7 +123,24 @@ def jscFlavor = 'org.webkit:android-jsc:+'
  */
 def enableHermes = project.ext.react.get("enableHermes", false);
 
+    // using mavenCentral() here gives this error:
+    //Execution failed for task ':app:javaPreCompileDebug'.
+    //> You must specify a URL for a Maven repository.
+repositories {
+    maven {
+        url "https://plugins.gradle.org/m2/"
+//        mavenCentral()
+    }
+}
+
 android {
+    // this also causes
+    // Duplicate class com.facebook.jni.xxx found in modules jetified-fbjni-0.1.0-runtime (com.facebook.fbjni:fbjni:0.1.0) and jetified-fbjni-java-only-0.0.3 (com.facebook.fbjni:fbjni-java-only:0.0.3)
+    // where xxx are 17 different classes
+    dependencies {
+        implementation 'com.facebook.fbjni:fbjni:0.1.0'
+    }
+
     compileSdkVersion rootProject.ext.compileSdkVersion
 
     compileOptions {
@@ -167,6 +184,12 @@ android {
         }
     }
 
+    externalNativeBuild {
+        cmake {
+            path "CMakeLists.txt"
+        }
+    }
+
     // applicationVariants are e.g. debug, release
     applicationVariants.all { variant ->
         variant.outputs.each { output ->
@@ -183,6 +206,7 @@ android {
     }
 }
 
+
 dependencies {
     implementation fileTree(dir: "libs", include: ["*.jar"])
     //noinspection GradleDynamicVersion

android/app/src/main/java/com/rnfbjni/generated/BasePackageList.java

@@ -0,0 +1,26 @@
+package com.rnfbjni.generated;
+
+import java.util.Arrays;
+import java.util.List;
+import org.unimodules.core.interfaces.Package;
+
+public class BasePackageList {
+  public List<Package> getPackageList() {
+    return Arrays.<Package>asList(
+        new expo.modules.application.ApplicationPackage(),
+        new expo.modules.constants.ConstantsPackage(),
+        new expo.modules.errorrecovery.ErrorRecoveryPackage(),
+        new expo.modules.filesystem.FileSystemPackage(),
+        new expo.modules.font.FontLoaderPackage(),
+        new expo.modules.imageloader.ImageLoaderPackage(),
+        new expo.modules.keepawake.KeepAwakePackage(),
+        new expo.modules.lineargradient.LinearGradientPackage(),
+        new expo.modules.location.LocationPackage(),
+        new expo.modules.permissions.PermissionsPackage(),
+        new expo.modules.securestore.SecureStorePackage(),
+        new expo.modules.splashscreen.SplashScreenPackage(),
+        new expo.modules.sqlite.SQLitePackage(),
+        new expo.modules.updates.UpdatesPackage()
+    );
+  }
+}

android/build.gradle

@@ -12,7 +12,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath("com.android.tools.build:gradle:3.5.3")
+        classpath('com.android.tools.build:gradle:4.1.2')
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

android/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,6 @@
+#Mon Mar 01 17:15:43 CET 2021
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.3-bin.zip