如何获取 Android 设备的主要电子邮件地址?
androidapps/applicationsmobile development
此示例演示如何获取 Android 设备的主要电子邮件地址。
步骤 1 − 在 Android Studio 中创建一个新项目，转到"文件"->"新建项目"，并填写所有必需的详细信息以创建新项目。
步骤 2 − 将以下代码添加到 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>
步骤 3 − 将以下代码添加到 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();
}
}
}
}
步骤 4 − 将以下代码添加到 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>
让我们尝试运行您的应用程序。假设您已将实际的 Android 移动设备连接到电脑。要从 Android Studio 运行该应用程序，请打开项目的某个 Activity 文件，然后点击工具栏上的"运行"
图标。选择您的移动设备作为选项，然后检查您的移动设备是否显示您的默认屏幕 −
请注意，此程序仅适用于已 root 的设备。
点击此处下载项目代码。
