fix: Use custom app name when getting build.gradle

packages/cli-platform-android/src/config/__fixtures__/android.ts

@@ -71,6 +71,20 @@ function generateValidFileStructureForApp() {
   };
 }
 
+function generateValidFileStructureForAppWithCustomAppName(
+  customAppName: string,
+) {
+  return {
+    'build.gradle': buildGradle,
+    [customAppName]: {
+      'build.gradle': appBuildGradle,
+    },
+    src: {
+      'AndroidManifest.xml': manifest,
+    },
+  };
+}
+
 export const valid = generateValidFileStructureForLib('ReactPackage.java');
 
 export const validKotlin = generateValidFileStructureForLib('ReactPackage.kt');
@@ -83,6 +97,9 @@ export const validKotlinWithDifferentFileName =
 
 export const validApp = generateValidFileStructureForApp();
 
+export const validAppWithCustomAppName =
+  generateValidFileStructureForAppWithCustomAppName('custom');
+
 export const userConfigManifest = {
   src: {
     main: {

packages/cli-platform-android/src/config/__tests__/findBuildGradle.test.ts

@@ -21,6 +21,9 @@ describe('findBuildGradle for apps', () => {
       flat: {
         android: mocks.validApp,
       },
+      customPath: {
+        android: mocks.validAppWithCustomAppName,
+      },
     });
   });
 
@@ -33,6 +36,12 @@ describe('findBuildGradle for apps', () => {
   it('returns `null` if there is no gradle in the app folder', () => {
     expect(findBuildGradle('/empty', false)).toBeNull();
   });
+
+  it('returns the app build.gradle with custom app name', () => {
+    expect(findBuildGradle('/customPath/android', false, 'custom')).toBe(
+      '/customPath/android/custom/build.gradle',
+    );
+  });
 });
 
 describe('findBuildGradle for libraries', () => {

packages/cli-platform-android/src/config/findBuildGradle.ts

@@ -1,14 +1,18 @@
 import fs from 'fs';
 import path from 'path';
 
-export function findBuildGradle(sourceDir: string, isLibrary: boolean) {
+export function findBuildGradle(
+  sourceDir: string,
+  isLibrary: boolean,
+  appName = 'app',
+) {
   const buildGradlePath = path.join(
     sourceDir,
-    isLibrary ? 'build.gradle' : 'app/build.gradle',
+    isLibrary ? 'build.gradle' : `${appName}/build.gradle`,
   );
   const buildGradleKtsPath = path.join(
     sourceDir,
-    isLibrary ? 'build.gradle.kts' : 'app/build.gradle.kts',
+    isLibrary ? 'build.gradle.kts' : `${appName}/build.gradle.kts`,
   );
 
   if (fs.existsSync(buildGradlePath)) {

packages/cli-platform-android/src/config/index.ts

@@ -48,7 +48,11 @@ export function projectConfig(
   const manifestPath = userConfig.manifestPath
     ? path.join(sourceDir, userConfig.manifestPath)
     : findManifest(path.join(sourceDir, appName));
-  const buildGradlePath = findBuildGradle(sourceDir, false);
+  const buildGradlePath = findBuildGradle(
+    sourceDir,
+    false,
+    appName === '' ? 'app' : appName,
+  );
 
   if (!manifestPath && !buildGradlePath) {
     return null;