fix: replacing name in Kotlin template

packages/cli/src/commands/init/__fixtures__/editTemplate/android/android-kotlin/com/placeholdername/MainActivity.kt

@@ -0,0 +1,22 @@
+package com.helloworld
+
+import com.facebook.react.ReactActivity
+import com.facebook.react.ReactActivityDelegate
+import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint.fabricEnabled
+import com.facebook.react.defaults.DefaultReactActivityDelegate
+
+class MainActivity : ReactActivity() {
+
+  /**
+   * Returns the name of the main component registered from JavaScript. This is used to schedule
+   * rendering of the component.
+   */
+  override fun getMainComponentName(): String = "PlaceholderName"
+
+  /**
+   * Returns the instance of the [ReactActivityDelegate]. We use [DefaultReactActivityDelegate]
+   * which allows you to enable New Architecture with a single boolean flags [fabricEnabled]
+   */
+  override fun createReactActivityDelegate(): ReactActivityDelegate =
+      DefaultReactActivityDelegate(this, mainComponentName, fabricEnabled)
+}

packages/cli/src/commands/init/__fixtures__/editTemplate/android/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Hello App Display Name</string>
+</resources>

packages/cli/src/commands/init/__tests__/__snapshots__/editTemplate.test.ts.snap

@@ -33,34 +33,36 @@ exports[`should edit template 2`] = `
 - First value
 + Second value
 
-@@ -1,2 +1,2 @@
-- com.placeholdername;
-+ com.projectname;
-
-@@ -4,4 +4,4 @@
-    public static void run() {
--     String name = \\"PlaceholderName\\";
--     String title = \\"Hello App Display Name\\";
-+     String name = \\"ProjectName\\";
-+     String title = \\"ProjectName\\";
-    }"
+@@ -1,3 +1,3 @@
+  <resources>
+-     <string name=\\"app_name\\">Hello App Display Name</string>
++     <string name=\\"app_name\\">ProjectName</string>
+  </resources>"
 `;
 
 exports[`should edit template 3`] = `
 "Snapshot Diff:
 - First value
 + Second value
 
-@@ -4,14 +4,14 @@
-    \\"/android/com\\",
--   \\"/android/com/placeholdername\\",
--   \\"/android/com/placeholdername/Main.java\\",
--   \\"/android/com/placeholdername/MainActivity.java\\",
--   \\"/android/com/placeholdername/PlaceholderName.java\\",
-+   \\"/android/com/projectname\\",
-+   \\"/android/com/projectname/Main.java\\",
-+   \\"/android/com/projectname/MainActivity.java\\",
-+   \\"/android/com/projectname/ProjectName.java\\",
+@@ -9,5 +9,5 @@
+    \\"/android/android-java/com/.DS_Store\\",
+-   \\"/android/android-java/com/placeholdername\\",
+-   \\"/android/android-java/com/placeholdername/MainActivity.java\\",
+-   \\"/android/android-java/com/placeholdername/PlaceholderName.java\\",
++   \\"/android/android-java/com/projectname\\",
++   \\"/android/android-java/com/projectname/MainActivity.java\\",
++   \\"/android/android-java/com/projectname/ProjectName.java\\",
+    \\"/android/android-kotlin\\",
+@@ -16,14 +16,14 @@
+    \\"/android/android-kotlin/com/.DS_Store\\",
+-   \\"/android/android-kotlin/com/placeholdername\\",
+-   \\"/android/android-kotlin/com/placeholdername/MainActivity.kt\\",
+-   \\"/android/android-kotlin/com/placeholdername/PlaceholderName.kt\\",
++   \\"/android/android-kotlin/com/projectname\\",
++   \\"/android/android-kotlin/com/projectname/MainActivity.kt\\",
++   \\"/android/android-kotlin/com/projectname/ProjectName.kt\\",
+    \\"/android/strings.xml\\",
     \\"/ios\\",
 -   \\"/ios/PlaceholderName\\",
 -   \\"/ios/PlaceholderName/AppDelegate.m\\",
@@ -78,21 +80,3 @@ exports[`should edit template 3`] = `
 +   \\"/ios/ProjectNameTests/.gitkeep\\",
     \\"/node_modules\\","
 `;
-
-exports[`should edit template with custom title 1`] = `
-"Snapshot Diff:
-- First value
-+ Second value
-
-@@ -1,2 +1,2 @@
-- com.placeholdername;
-+ com.projectname;
-
-@@ -4,4 +4,4 @@
-    public static void run() {
--     String name = \\"PlaceholderName\\";
--     String title = \\"Hello App Display Name\\";
-+     String name = \\"ProjectName\\";
-+     String title = \\"ProjectTitle\\";
-    }"
-`;

packages/cli/src/commands/init/__tests__/editTemplate.test.ts

@@ -55,24 +55,12 @@ test('should edit template', async () => {
   const transformedTree = walk(testPath).map((e) => e.replace(testPath, ''));
   const fixtureTree = walk(FIXTURE_DIR).map((e) => e.replace(FIXTURE_DIR, ''));
 
-  const oldJavaFile = fs.readFileSync(
-    path.resolve(
-      FIXTURE_DIR,
-      'android',
-      'com',
-      PLACEHOLDER_NAME.toLowerCase(),
-      'Main.java',
-    ),
+  const oldXmlFile = fs.readFileSync(
+    path.resolve(FIXTURE_DIR, 'android', 'strings.xml'),
     'utf8',
   );
-  const newJavaFile = fs.readFileSync(
-    path.resolve(
-      testPath,
-      'android',
-      'com',
-      PROJECT_NAME.toLowerCase(),
-      'Main.java',
-    ),
+  const newXmlFile = fs.readFileSync(
+    path.resolve(testPath, 'android', 'strings.xml'),
     'utf8',
   );
 
@@ -87,7 +75,7 @@ test('should edit template', async () => {
 
   expect(snapshotDiff(oldCFile, newCFile, {contextLines: 1})).toMatchSnapshot();
   expect(
-    snapshotDiff(oldJavaFile, newJavaFile, {contextLines: 1}),
+    snapshotDiff(oldXmlFile, newXmlFile, {contextLines: 1}),
   ).toMatchSnapshot();
   expect(
     snapshotDiff(fixtureTree.map(slash), transformedTree.map(slash), {
@@ -105,30 +93,14 @@ test('should edit template with custom title', async () => {
     projectTitle: PROJECT_TITLE,
   });
 
-  const oldJavaFile = fs.readFileSync(
-    path.resolve(
-      FIXTURE_DIR,
-      'android',
-      'com',
-      PLACEHOLDER_NAME.toLowerCase(),
-      'Main.java',
-    ),
-    'utf8',
-  );
-  const newJavaFile = fs.readFileSync(
-    path.resolve(
-      testPath,
-      'android',
-      'com',
-      PROJECT_NAME.toLowerCase(),
-      'Main.java',
-    ),
+  const replacedFile = fs.readFileSync(
+    path.resolve(testPath, 'android', 'strings.xml'),
     'utf8',
   );
 
-  expect(
-    snapshotDiff(oldJavaFile, newJavaFile, {contextLines: 1}),
-  ).toMatchSnapshot();
+  expect(replacedFile).toContain(
+    `<string name="app_name">${PROJECT_TITLE}</string>`,
+  );
 });
 
 describe('changePlaceholderInTemplate', () => {
@@ -204,7 +176,7 @@ describe('replacePlaceholderWithPackageName', () => {
     ).toBeTruthy();
   });
 
-  test(`should rename Main component name for Android with ${PROJECT_NAME}`, async () => {
+  test(`should rename Main component name for Android with ${PROJECT_NAME} in Java template`, async () => {
     await replacePlaceholderWithPackageName({
       projectName: PROJECT_NAME,
       placeholderName: PLACEHOLDER_NAME,
@@ -216,6 +188,7 @@ describe('replacePlaceholderWithPackageName', () => {
       path.resolve(
         testPath,
         'android',
+        'android-java',
         'com',
         PACKAGE_NAME,
         'MainActivity.java',
@@ -225,6 +198,29 @@ describe('replacePlaceholderWithPackageName', () => {
 
     expect(mainActivityFile.includes(`return "${PROJECT_NAME}"`)).toBeTruthy();
   });
+
+  test(`should rename Main component name for Android with ${PROJECT_NAME} in Kotlin template`, async () => {
+    await replacePlaceholderWithPackageName({
+      projectName: PROJECT_NAME,
+      placeholderName: PLACEHOLDER_NAME,
+      placeholderTitle: 'Test',
+      packageName: PACKAGE_NAME,
+    });
+
+    const mainActivityFile = fs.readFileSync(
+      path.resolve(
+        testPath,
+        'android',
+        'android-kotlin',
+        'com',
+        PACKAGE_NAME,
+        'MainActivity.kt',
+      ),
+      'utf8',
+    );
+
+    expect(mainActivityFile.includes(`= "${PROJECT_NAME}"`)).toBeTruthy();
+  });
 });
 
 describe('validatePackageName', () => {

packages/cli/src/commands/init/editTemplate.ts

@@ -169,12 +169,22 @@ export async function replacePlaceholderWithPackageName({
       if (filePath.includes('app.json')) {
         await replaceNameInUTF8File(filePath, projectName, placeholderName);
       } else {
-        // replace main component name for Android package
-        await replaceNameInUTF8File(
-          filePath,
-          `return "${projectName}"`,
-          `return "${placeholderName}"`,
-        );
+        const fileExtension = path.extname(filePath);
+
+        if (fileExtension === '.java') {
+          await replaceNameInUTF8File(
+            filePath,
+            `return "${projectName}"`,
+            `return "${placeholderName}"`,
+          );
+        } else if (fileExtension === '.kt') {
+          await replaceNameInUTF8File(
+            filePath,
+            `= "${projectName}"`,
+            `= "${placeholderName}"`,
+          );
+        }
+
         await replaceNameInUTF8File(
           filePath,
           `<string name="app_name">${projectName}</string>`,