Android application to send mail

Here's a step-by-step guide to creating an Android application to send an email:

Prerequisites:

Android Studio (the official Integrated Development Environment (IDE) for Android app development)
Basic knowledge of Java or Kotlin programming language
Android SDK (Software Development Kit) installed on your system

Step 1: Create a new Android project

Open Android Studio and click on "Start a new Android Studio project".
Choose "Empty Activity" as the project template and click "Next".
Fill in the project details, such as project name, package name, and location.
Click "Finish" to create the project.

Step 2: Add the necessary dependencies

In the project structure, navigate to the app folder and open the build.gradle file.

Add the following dependencies to the dependencies block:

implementation 'com.google.android.gms:play-services-auth:19.0.0'
implementation 'com.google.android.gms:play-services-gcm:19.0.0'
implementation 'androidx.appcompat:appcompat:1.2.0'

Click "Sync Now" to sync the project with the Gradle files.

Step 3: Create the email sending activity

In the project structure, navigate to the app folder and create a new Java or Kotlin class file (e.g., EmailSenderActivity.java or EmailSenderActivity.kt).

In the activity file, add the following code:


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import com.google.android.gms.auth.api.Auth; import com.google.android.gms.auth.api.signin.GoogleSignIn; import com.google.android.gms.auth.api.signin.GoogleSignInAccount; import com.google.android.gms.auth.api.signin.GoogleSignInOptions; import com.google.android.gms.common.api.GoogleApiClient; import com.google.android.gms.common.api.Status; import com.google.android.gms.tasks.OnCompleteListener; import com.google.android.gms.tasks.Task; import com.google.firebase.auth.FirebaseAuth; import com.google.firebase.auth.FirebaseAuthException; import com.google.firebase.auth.FirebaseUser; import com.google.firebase.messaging.FirebaseMessaging;

public class EmailSenderActivity extends Activity { private static final int REQUEST_CODE_SIGN_IN = 100; private static final String EMAIL_SENDER_API_KEY = "YOUR_API_KEY"; private static final String EMAIL_SENDER_API_ID = "YOUR_API_ID";

private EditText etTo;
private EditText etSubject;
private EditText etMessage;
private Button btnSend;

private GoogleApiClient mGoogleApiClient;
private FirebaseAuth mAuth;
private FirebaseUser mUser;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_email_sender);

    etTo = findViewById(R.id.et_to);
    etSubject = findViewById(R.id.et_subject);
    etMessage = findViewById(R.id.et_message);
    btnSend = findViewById(R.id.btn_send);

    mAuth = FirebaseAuth.getInstance();
    mUser = mAuth.getCurrentUser();

    btnSend.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            sendEmail();
        }
    });
}

private void sendEmail() {
    String to = etTo.getText().toString();
    String subject = etSubject.getText().toString();
    String message = etMessage.getText().toString();

    if (to.isEmpty() || subject.isEmpty() || message.isEmpty()) {
        Toast.makeText(this, "Please fill in all fields", Toast.LENGTH_SHORT).show();
        return;
    }

    Intent intent = new Intent(Intent.ACTION_SEND);
    intent.setType("message/rfc822");
    intent.putExtra(Intent.EXTRA_EMAIL, new String[]{to});
    intent.putExtra(Intent.EXTRA_SUBJECT, subject);
    intent.putExtra(Intent.EXTRA_TEXT, message);

    try {
        startActivity(Intent.createChooser(intent, "Send email"));
    } catch (android.content.ActivityNotFoundException ex) {
        Toast.makeText(this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
    }
}

}

**Step 4: Add the email sending functionality**

1. In the `sendEmail()` method, create an `Intent` object with the email sending action.
2. Set the `to` address, `subject`, and `message` using the `EXTRA_EMAIL`, `EXTRA_SUBJECT`, and `EXTRA_TEXT` extras.
3. Use the `startActivity()` method to launch the email client.

**Step 5: Add the necessary permissions**

1. In the `AndroidManifest.xml` file, add the following permissions:
```xml
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Step 6: Test the application

Run the application on an emulator or a physical device.
Fill in the email fields and click the "Send" button.
The email client should launch and send the email.

Note: This is a basic example of an email sending application. You may want to add additional features, such as error handling, email attachment support, and more.

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Android application to send mail