diff --git a/src/extension/android/packageNameResolver.ts b/src/extension/android/packageNameResolver.ts
index 80cf6861c..bfb458514 100644
--- a/src/extension/android/packageNameResolver.ts
+++ b/src/extension/android/packageNameResolver.ts
@@ -6,12 +6,19 @@ import { FileSystem } from "../../common/node/fileSystem";
 
 export class PackageNameResolver {
     private static PackageNameRegexp: RegExp = /package="(.+?)"/;
+    private static ApplicationIdRegexp: RegExp = /applicationId\s+(=)?\s*["'](.+?)["']/;
     private static ManifestName = "AndroidManifest.xml";
+    private static GradleBuildName = "build.gradle";
     private static DefaultPackagePrefix = "com.";
     private static SourceRootRelPath: string[] = ["android", "app", "src", "main"];
     private static DefaultManifestLocation: string[] = PackageNameResolver.SourceRootRelPath.concat(
         PackageNameResolver.ManifestName,
     );
+    private static DefaultGradleBuildLocation: string[] = [
+        "android",
+        "app",
+        PackageNameResolver.GradleBuildName,
+    ];
     private applicationName: string;
 
     constructor(applicationName: string) {
@@ -22,7 +29,16 @@ export class PackageNameResolver {
      * Tries to find the package name in AndroidManifest.xml. If not found, it returns the default package name,
      * which is the application name prefixed with the default prefix.
      */
-    public resolvePackageName(projectRoot: string): Promise<string> {
+    public async resolvePackageName(projectRoot: string): Promise<string> {
+        const expectedGradleBuildPath = path.join.apply(
+            this,
+            [projectRoot].concat(PackageNameResolver.DefaultGradleBuildLocation),
+        );
+        const gradlePackageName = await this.readApplicationId(expectedGradleBuildPath);
+        if (gradlePackageName) {
+            return gradlePackageName;
+        }
+
         const expectedAndroidManifestPath = path.join.apply(
             this,
             [projectRoot].concat(PackageNameResolver.DefaultManifestLocation),
@@ -30,6 +46,18 @@ export class PackageNameResolver {
         return this.readPackageName(expectedAndroidManifestPath);
     }
 
+    private async readApplicationId(gradlePath: string): Promise<string | null> {
+        if (gradlePath) {
+            const fs = new FileSystem();
+            if (await fs.exists(gradlePath)) {
+                const content = await fs.readFile(gradlePath);
+                const match = content.toString().match(PackageNameResolver.ApplicationIdRegexp);
+                return match ? match[2] : null;
+            }
+        }
+        return null;
+    }
+
     /**
      * Given a manifest file path, it parses the file and returns the package name.
      * If the package name cannot be parsed, the default packge name is returned.
diff --git a/test/extension/android/packageNameResolver.test.ts b/test/extension/android/packageNameResolver.test.ts
new file mode 100644
index 000000000..54404bc4d
--- /dev/null
+++ b/test/extension/android/packageNameResolver.test.ts
@@ -0,0 +1,135 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for details.
+
+import * as path from "path";
+import * as assert from "assert";
+const sinon = require("sinon");
+import { PackageNameResolver } from "../../../src/extension/android/packageNameResolver";
+import { FileSystem } from "../../../src/common/node/fileSystem";
+
+suite("PackageNameResolver", function () {
+    const projectRoot = path.join(__dirname, "mockProject");
+    const androidRoot = path.join(projectRoot, "android");
+    const appRoot = path.join(androidRoot, "app");
+    const manifestPath = path.join(appRoot, "src", "main", "AndroidManifest.xml");
+    const buildGradlePath = path.join(appRoot, "build.gradle");
+
+    let readFileStub: any;
+    let existsStub: any;
+
+    setup(() => {
+        // Mock FileSystem methods
+        existsStub = sinon.stub(FileSystem.prototype, "exists");
+        readFileStub = sinon.stub(FileSystem.prototype, "readFile");
+    });
+
+    teardown(() => {
+        if (existsStub) existsStub.restore();
+        if (readFileStub) readFileStub.restore();
+    });
+
+    test("should resolve package name from AndroidManifest.xml if build.gradle is missing", async () => {
+        const manifestContent = `
+            <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+                package="com.example.manifest">
+            </manifest>`;
+
+        existsStub.withArgs(manifestPath).returns(Promise.resolve(true));
+        existsStub.withArgs(buildGradlePath).returns(Promise.resolve(false));
+        readFileStub.withArgs(manifestPath).returns(Promise.resolve(manifestContent));
+
+        const resolver = new PackageNameResolver("ExampleApp");
+        const packageName = await resolver.resolvePackageName(projectRoot);
+
+        assert.strictEqual(packageName, "com.example.manifest");
+    });
+
+    test("should resolve application id from build.gradle", async () => {
+        const buildGradleContent = `
+            android {
+                defaultConfig {
+                    applicationId "com.example.gradle"
+                }
+            }
+        `;
+
+        existsStub.withArgs(buildGradlePath).returns(Promise.resolve(true));
+        readFileStub.withArgs(buildGradlePath).returns(Promise.resolve(buildGradleContent));
+
+        const resolver = new PackageNameResolver("ExampleApp");
+        const packageName = await resolver.resolvePackageName(projectRoot);
+
+        // This is expected to fail until the fix is implemented
+        assert.strictEqual(packageName, "com.example.gradle");
+    });
+
+    test("should prioritize build.gradle applicationId over AndroidManifest.xml package", async () => {
+        const manifestContent = `
+            <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+                package="com.example.manifest">
+            </manifest>`;
+        const buildGradleContent = `
+            android {
+                defaultConfig {
+                    applicationId "com.example.gradle"
+                }
+            }
+        `;
+
+        existsStub.withArgs(manifestPath).returns(Promise.resolve(true));
+        existsStub.withArgs(buildGradlePath).returns(Promise.resolve(true));
+        readFileStub.withArgs(manifestPath).returns(Promise.resolve(manifestContent));
+        readFileStub.withArgs(buildGradlePath).returns(Promise.resolve(buildGradleContent));
+
+        const resolver = new PackageNameResolver("ExampleApp");
+        const packageName = await resolver.resolvePackageName(projectRoot);
+
+        // This is expected to fail until the fix is implemented
+        assert.strictEqual(packageName, "com.example.gradle");
+    });
+
+    test("should resolve application id from build.gradle using single quotes", async () => {
+        const buildGradleContent = `
+            android {
+                defaultConfig {
+                    applicationId 'com.example.gradle.singlequote'
+                }
+            }
+        `;
+
+        existsStub.withArgs(buildGradlePath).returns(Promise.resolve(true));
+        readFileStub.withArgs(buildGradlePath).returns(Promise.resolve(buildGradleContent));
+
+        const resolver = new PackageNameResolver("ExampleApp");
+        const packageName = await resolver.resolvePackageName(projectRoot);
+
+        assert.strictEqual(packageName, "com.example.gradle.singlequote");
+    });
+
+    test("should resolve application id from build.gradle using assignment", async () => {
+        const buildGradleContent = `
+            android {
+                defaultConfig {
+                    applicationId = "com.example.gradle.assignment"
+                }
+            }
+        `;
+
+        existsStub.withArgs(buildGradlePath).returns(Promise.resolve(true));
+        readFileStub.withArgs(buildGradlePath).returns(Promise.resolve(buildGradleContent));
+
+        const resolver = new PackageNameResolver("ExampleApp");
+        const packageName = await resolver.resolvePackageName(projectRoot);
+
+        assert.strictEqual(packageName, "com.example.gradle.assignment");
+    });
+
+    test("should fall back to default package name if neither file exists", async () => {
+        existsStub.returns(Promise.resolve(false));
+
+        const resolver = new PackageNameResolver("ExampleApp");
+        const packageName = await resolver.resolvePackageName(projectRoot);
+
+        assert.strictEqual(packageName, "com.exampleapp");
+    });
+});