如何获取 Android 的主电子邮件地址（或电子邮件地址列表）？
据我了解，在 OS 2.0+ 上支持多个电子邮件地址，但在 2.0 以下，每台设备只能拥有一个电子邮件地址。
【问题讨论】：
有几种方法可以做到这一点，如下所示。
作为一个友好的警告，在处理帐户、个人资料和联系人数据时，请务必小心并提前告知用户。如果您滥用用户的电子邮件地址或其他个人信息，可能会发生不好的事情。
您可以使用AccountManager.getAccounts 或AccountManager.getAccountsByType 获取设备上所有帐户名称的列表。幸运的是，对于某些帐户类型（包括com.google），帐户名称是电子邮件地址。示例如下 sn-p。
Pattern emailPattern = Patterns.EMAIL_ADDRESS; // API level 8+
Account[] accounts = AccountManager.get(context).getAccounts();
for (Account account : accounts) {
if (emailPattern.matcher(account.name).matches()) {
String possibleEmail = account.name;
...
}
}
请注意，这需要GET_ACCOUNTS 权限：
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
有关使用 AccountManager 的更多信息，请参阅 SDK 中的 Contact Manager 示例代码。
从 Android 4.0（冰淇淋三明治）开始，您可以通过访问用户的个人资料来获取用户的电子邮件地址。访问用户个人资料有点重，因为它需要两个权限（更多内容见下文），但电子邮件地址是相当敏感的数据，所以这是入场费。
以下是使用CursorLoader 检索包含电子邮件地址的配置文件数据行的完整示例。
public class ExampleActivity extends Activity implements LoaderManager.LoaderCallbacks<Cursor> {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getLoaderManager().initLoader(0, null, this);
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle arguments) {
return new CursorLoader(this,
// Retrieve data rows for the device user's 'profile' contact.
Uri.withAppendedPath(
ContactsContract.Profile.CONTENT_URI,
ContactsContract.Contacts.Data.CONTENT_DIRECTORY),
ProfileQuery.PROJECTION,
// Select only email addresses.
ContactsContract.Contacts.Data.MIMETYPE + " = ?",
new String[]{ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE},
// Show primary email addresses first. Note that there won't be
// a primary email address if the user hasn't specified one.
ContactsContract.Contacts.Data.IS_PRIMARY + " DESC");
}
@Override
public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
List<String> emails = new ArrayList<String>();
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
emails.add(cursor.getString(ProfileQuery.ADDRESS));
// Potentially filter on ProfileQuery.IS_PRIMARY
cursor.moveToNext();
}
...
}
@Override
public void onLoaderReset(Loader<Cursor> cursorLoader) {
}
private interface ProfileQuery {
String[] PROJECTION = {
ContactsContract.CommonDataKinds.Email.ADDRESS,
ContactsContract.CommonDataKinds.Email.IS_PRIMARY,
};
int ADDRESS = 0;
int IS_PRIMARY = 1;
}
}
这需要READ_PROFILE 和READ_CONTACTS 权限：
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
【讨论】：
cursor.isAfterLast() 总是返回真。有什么想法吗？
这可能对其他人有用：
Using AccountPicker to get user's email address 没有任何全局权限，并允许用户知道并授权或取消该过程。
【讨论】：
我会使用 ICS 中引入的 Android 的 AccountPicker。
Intent googlePicker = AccountPicker.newChooseAccountIntent(null, null, new String[]{GoogleAuthUtil.GOOGLE_ACCOUNT_TYPE}, true, null, null, null, null);
startActivityForResult(googlePicker, REQUEST_CODE);
然后等待结果：
protected void onActivityResult(final int requestCode, final int resultCode,
final Intent data) {
if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
String accountName = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
}
}
【讨论】：
public String getUsername() {
AccountManager manager = AccountManager.get(this);
Account[] accounts = manager.getAccountsByType("com.google");
List<String> possibleEmails = new LinkedList<String>();
for (Account account : accounts) {
// TODO: Check possibleEmail against an email regex or treat
// account.name as an email address only for certain account.type values.
possibleEmails.add(account.name);
}
if (!possibleEmails.isEmpty() && possibleEmails.get(0) != null) {
String email = possibleEmails.get(0);
String[] parts = email.split("@");
if (parts.length > 1)
return parts[0];
}
return null;
}
【讨论】：
android.permission.GET_ACCOUNTS，它被定义为“危险”权限（需要运行时请求）：developer.android.com/reference/android/…
有一个 Android api 允许用户在不需要许可的情况下选择他们的电子邮件地址。看一看：https://developers.google.com/identity/smartlock-passwords/android/retrieve-hints
HintRequest hintRequest = new HintRequest.Builder()
.setHintPickerConfig(new CredentialPickerConfig.Builder()
.setShowCancelButton(true)
.build())
.setEmailAddressIdentifierSupported(true)
.setAccountTypes(IdentityProviders.GOOGLE)
.build();
PendingIntent intent = mCredentialsClient.getHintPickerIntent(hintRequest);
try {
startIntentSenderForResult(intent.getIntentSender(), RC_HINT, null, 0, 0, 0);
} catch (IntentSender.SendIntentException e) {
Log.e(TAG, "Could not start hint picker Intent", e);
}
这将显示一个选择器，用户可以在其中选择电子邮件地址。结果将发送到onActivityResult()
【讨论】：
可悲的是，接受的答案不起作用。
我迟到了，但这是内部 Android 电子邮件应用程序的解决方案，除非内容 uri 由提供商更改：
Uri EMAIL_ACCOUNTS_DATABASE_CONTENT_URI =
Uri.parse("content://com.android.email.provider/account");
public ArrayList<String> GET_EMAIL_ADDRESSES ()
{
ArrayList<String> names = new ArrayList<String>();
ContentResolver cr = m_context.getContentResolver();
Cursor cursor = cr.query(EMAIL_ACCOUNTS_DATABASE_CONTENT_URI ,null,
null, null, null);
if (cursor == null) {
Log.e("TEST", "Cannot access email accounts database");
return null;
}
if (cursor.getCount() <= 0) {
Log.e("TEST", "No accounts");
return null;
}
while (cursor.moveToNext()) {
names.add(cursor.getString(cursor.getColumnIndex("emailAddress")));
Log.i("TEST", cursor.getString(cursor.getColumnIndex("emailAddress")));
}
return names;
}
【讨论】：
这在 Android 中是相当棘手的事情，我还没有做到。但也许这些链接可以帮助你：
【讨论】：
使用这个方法：
public String getUserEmail() {
AccountManager manager = AccountManager.get(App.getInstance());
Account[] accounts = manager.getAccountsByType("com.google");
List<String> possibleEmails = new LinkedList<>();
for (Account account : accounts) {
possibleEmails.add(account.name);
}
if (!possibleEmails.isEmpty() && possibleEmails.get(0) != null) {
return possibleEmails.get(0);
}
return "";
}
请注意，这需要GET_ACCOUNTS 权限：
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
然后：
editTextEmailAddress.setText(getUserEmail());
【讨论】：
建议的答案将不再有效，因为从 android 8 开始施加了新的限制。
更多信息在这里：https://developer.android.com/about/versions/oreo/android-8.0-changes.html#aaad
【讨论】：
在清单中添加这一行（获得许可）
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
然后将此代码粘贴到您的活动中
private ArrayList<String> getPrimaryMailId() {
ArrayList<String> accountsList = new ArrayList<String>();
try {
Account[] accounts = AccountManager.get(this).getAccountsByType("com.google");
for (Account account : accounts) {
accountsList.add(account.name);
Log.e("GetPrimaryMailId ", account.name);
}
} catch (Exception e) {
Log.e("GetPrimaryMailId", " Exception : " + e);
}
return accountsList;
}
【讨论】：
第 1 步 - 在 AndroidManifest.xml 中添加以下代码 -
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
第 2 步 - 在您的活动中添加以下代码，在运行时请求权限。
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if ((ActivityCompat.checkSelfPermission(this, Manifest.permission.GET_ACCOUNTS) == PackageManager.PERMISSION_GRANTED) && (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) == PackageManager.PERMISSION_GRANTED)) {
getGoogleAccounts();
}
else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.GET_ACCOUNTS, Manifest.permission.READ_CONTACTS}, 1);
//return false;
}
}
第 3 步 - 为 onRequestPermissionsResult 添加代码 -
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
getGoogleAccounts();
}
}
第 4 步 - 最后添加代码以使用 AccountManager 检索帐户
private void getGoogleAccounts(){
AccountManager am = AccountManager.get(this); // "this" references the current Context
Account[] accounts = am.getAccountsByType("com.google");
for (Account acc : accounts){
System.out.println("http accounts " + acc);
}
}
请参考以下链接了解 android 8 的变化 - https://developer.android.com/about/versions/oreo/android-8.0-changes#aaad
【讨论】：
Android 最近锁定了GET_ACCOUNTS，所以有些答案对我不起作用。我在 Android 7.0 上进行了这项工作，但需要注意的是您的用户必须忍受权限对话框。
AndroidManifest.xml
<uses-permission android:name="android.permission.GET_ACCOUNTS"/>
MainActivity.java
package com.example.patrick.app2;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.accounts.AccountManager;
import android.accounts.Account;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.*;
public class MainActivity extends AppCompatActivity {
final static int requestcode = 4; //arbitrary constant less than 2^16
private static String getEmailId(Context context) {
AccountManager accountManager = AccountManager.get(context);
Account[] accounts = accountManager.getAccountsByType("com.google");
Account account;
if (accounts.length > 0) {
account = accounts[0];
} else {
return "length is zero";
}
return account.name;
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case requestcode:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
String emailAddr = getEmailId(getApplicationContext());
ShowMessage(emailAddr);
} else {
ShowMessage("Permission Denied");
}
}
}
public void ShowMessage(String email)
{
AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
alertDialog.setTitle("Alert");
alertDialog.setMessage(email);
alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog.show();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Context context = getApplicationContext();
if ( ContextCompat.checkSelfPermission( context, android.Manifest.permission.GET_ACCOUNTS )
!= PackageManager.PERMISSION_GRANTED )
{
ActivityCompat.requestPermissions( this, new String[]
{ android.Manifest.permission.GET_ACCOUNTS },requestcode );
}
else
{
String possibleEmail = getEmailId(getApplicationContext());
ShowMessage(possibleEmail);
}
}
}
【讨论】：
在 MarshMallow 操作系统中工作
btn_click=(Button) findViewById(R.id.btn_click);
btn_click.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0)
{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
{
int permissionCheck = ContextCompat.checkSelfPermission(PermissionActivity.this,
android.Manifest.permission.CAMERA);
if (permissionCheck == PackageManager.PERMISSION_GRANTED)
{
//showing dialog to select image
String possibleEmail=null;
Pattern emailPattern = Patterns.EMAIL_ADDRESS; // API level 8+
Account[] accounts = AccountManager.get(PermissionActivity.this).getAccounts();
for (Account account : accounts) {
if (emailPattern.matcher(account.name).matches()) {
possibleEmail = account.name;
Log.e("keshav","possibleEmail"+possibleEmail);
}
}
Log.e("keshav","possibleEmail gjhh->"+possibleEmail);
Log.e("permission", "granted Marshmallow O/S");
} else { ActivityCompat.requestPermissions(PermissionActivity.this,
new String[]{android.Manifest.permission.READ_EXTERNAL_STORAGE,
android.Manifest.permission.READ_PHONE_STATE,
Manifest.permission.GET_ACCOUNTS,
android.Manifest.permission.CAMERA}, 1);
}
} else {
// Lower then Marshmallow
String possibleEmail=null;
Pattern emailPattern = Patterns.EMAIL_ADDRESS; // API level 8+
Account[] accounts = AccountManager.get(PermissionActivity.this).getAccounts();
for (Account account : accounts) {
if (emailPattern.matcher(account.name).matches()) {
possibleEmail = account.name;
Log.e("keshav","possibleEmail"+possibleEmail);
}
Log.e("keshav","possibleEmail gjhh->"+possibleEmail);
}
}
});
【讨论】：