How to get the Android device's primary e-mail address?

AndroidApps/ApplicationsMobile Development

This example demonstrates how do I get the android device's primary e-mail address.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:padding="8dp"
   tools:context=".MainActivity">
   <TextView
      android:id="@+id/textView"
      android:layout_centerInParent="true"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:textSize="24sp"
      android:textStyle="bold"
      android:textAlignment="center"
      android:text="Primary email Address: testemail@gmail.com" />
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.java

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.util.Patterns;
import android.widget.TextView;
import android.widget.Toast;
import java.util.regex.Pattern;
public class MainActivity extends AppCompatActivity {
   private Activity activity = MainActivity.this;
   private static final int PERMISSION_REQUEST_CODE = 1;
   TextView textView;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      textView = findViewById(R.id.textView);
      String wantPermission = Manifest.permission.GET_ACCOUNTS;
      if (!checkPermission(wantPermission)) {
         requestPermission(wantPermission);
      } else {
         getEmails();
      }
   }
   private void getEmails() {
      Pattern emailPattern = Patterns.EMAIL_ADDRESS;
      Account[] accounts = AccountManager.get(this).getAccounts();
      for (Account account : accounts) {
         if (emailPattern.matcher(account.name).matches()) {
            String TAG = "MainActivity";
            Log.d(TAG, String.format("%s - %s", account.name, account.type));
            textView.setText("Primary email Address: " + accounts.toString());
         }
      }
   }
   private boolean checkPermission(String permission) {
      if (Build.VERSION.SDK_INT >= 23) {
         int result = ContextCompat.checkSelfPermission(activity, permission);
         return result == PackageManager.PERMISSION_GRANTED;
      } else {
         return true;
      }
   }
   private void requestPermission(String permission) {
      if (ActivityCompat.shouldShowRequestPermissionRationale(activity, permission)) {
         Toast.makeText(activity, "Get account permission allows us to get your email", Toast.LENGTH_LONG).show();
      }
      ActivityCompat.requestPermissions(activity, new String[]{permission}, PERMISSION_REQUEST_CODE);
   }
   @Override
   public void onRequestPermissionsResult(int requestCode, @NonNull String[]
   permissions, @NonNull int[] grantResults) {
      if (requestCode == PERMISSION_REQUEST_CODE) {
         if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            getEmails();
         } else {
            Toast.makeText(activity, "Permission Denied.", Toast.LENGTH_LONG).show();
         }
      }
   }
}

Step 4 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <uses-permission android:name="android.permission.GET_ACCOUNTS" />
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from the android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −

Kindly note that this program will only work on rooted devices only.

Click here to download the project code.

raja
Published on 22-Nov-2019 17:20:45
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