Project initialization (npx create-react-native-library)

android/build.gradle

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+buildscript {
+    if (project == rootProject) {
+        repositories {
+            google()
+            mavenCentral()
+            jcenter()
+        }
+
+        dependencies {
+            classpath 'com.android.tools.build:gradle:3.5.3'
+        }
+    }
+}
+
+apply plugin: 'com.android.library'
+
+def safeExtGet(prop, fallback) {
+    rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+}
+
+android {
+    compileSdkVersion safeExtGet('BigbluebuttonMobileSdk_compileSdkVersion', 29)
+    defaultConfig {
+        minSdkVersion safeExtGet('BigbluebuttonMobileSdk_minSdkVersion', 16)
+        targetSdkVersion safeExtGet('BigbluebuttonMobileSdk_targetSdkVersion', 29)
+        versionCode 1
+        versionName "1.0"
+
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+    }
+    lintOptions {
+        disable 'GradleCompatible'
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+repositories {
+    mavenLocal()
+    maven {
+        // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
+        url("$rootDir/../node_modules/react-native/android")
+    }
+    google()
+    mavenCentral()
+    jcenter()
+}
+
+dependencies {
+    //noinspection GradleDynamicVersion
+    implementation "com.facebook.react:react-native:+"  // From node_modules
+}

android/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.bigbluebuttonmobilesdk">
+
+</manifest>

android/src/main/java/com/bigbluebuttonmobilesdk/BigbluebuttonMobileSdkPackage.java

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+package com.bigbluebuttonmobilesdk;
+
+import com.facebook.react.ReactPackage;
+import com.facebook.react.bridge.NativeModule;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.uimanager.ViewManager;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class BigbluebuttonMobileSdkPackage implements ReactPackage {
+    @Override
+    public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
+        return Arrays.<ViewManager>asList(new BigbluebuttonMobileSdkViewManager());
+    }
+}

android/src/main/java/com/bigbluebuttonmobilesdk/BigbluebuttonMobileSdkViewManager.java

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+package com.bigbluebuttonmobilesdk;
+
+import android.graphics.Color;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+
+import com.facebook.react.uimanager.SimpleViewManager;
+import com.facebook.react.uimanager.ThemedReactContext;
+import com.facebook.react.uimanager.annotations.ReactProp;
+
+public class BigbluebuttonMobileSdkViewManager extends SimpleViewManager<View> {
+    public static final String REACT_CLASS = "BigbluebuttonMobileSdkView";
+
+    @Override
+    @NonNull
+    public String getName() {
+        return REACT_CLASS;
+    }
+
+    @Override
+    @NonNull
+    public View createViewInstance(ThemedReactContext reactContext) {
+        return new View(reactContext);
+    }
+
+    @ReactProp(name = "color")
+    public void setColor(View view, String color) {
+        view.setBackgroundColor(Color.parseColor(color));
+    }
+}