Gmail OAuth Integration for Android App

G'day Solution: To integrate Gmail OAuth authentication into your Android app, follow these steps: 1. Create a Gmail API project in the Google Developers Console: To access Gmail's API, you need to create a project in the Google Developers Console. Go to the console and click on “Create Project” button. Give it a name and click on the “Create” button. 2. Enable the Gmail API for your project: Once your project is created, you need to enable the Gmail API. Select “APIs & Services” from the left side menu and search for “Gmail API”. Click on it and then click on the “Enable” button. 3. Create an OAuth client ID: To allow your app to access the Gmail API, you need to create an OAuth client ID. Go to “Credentials” from the left side menu and click on “Create Credentials”. Select “OAuth Client ID”. 4. Configure your OAuth consent screen: Before creating the client ID, you need to configure your OAuth consent screen. Provide a name for your app and click on “Save”. 5. Choose the right application type: On the next screen, you will need to select the right application type. Choose “Android” as the type and enter your app’s package name. Also, add your app’s SHA-1 certificate fingerprint. You can find the SHA-1 fingerprint of your certificate using the keytool command. Click on the “Create” button. 6. Add your OAuth client ID to your app: Once your client ID is created, you will get a client ID and a client secret. Copy these credentials and add them to your app’s code. You can refer to the Google API documentation for more details on how to add the client ID to your app. 7. Test the integration: Now that you have added the OAuth client ID to your app, you can test the integration. Run your app and try to sign in using Gmail. You should be prompted to give your app access to your Gmail account. Allow the access and you should be able to successfully sign in using Gmail. 8. Switch from the previous developer account: To switch from the previous developer account to your own, you will need to repeat the above steps and create a new OAuth client ID using your own account. Once created, you can replace the old client ID and secret in your app’s code with the new one. By following these steps, you should be able to successfully integrate Gmail OAuth authentication into your Android app and switch to your own developer account. Best regards, Giáp Văn Hưng

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