AccountManager.addAccount()
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public AccountManagerFuture<Bundle> addAccount(final String accountType,
final String authTokenType, final String[] requiredFeatures,
final Bundle addAccountOptions,
final Activity activity, AccountManagerCallback<Bundle> callback, Handler handler) {
...
}
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在程序中創建指定類型的系統帳號,需要提供一個AccountManagerCallback類型的回調,后面會講到其作用。
本方法要求用戶添加指定類型的帳號。
此種帳號類型對應的authenticator將加載對應的UI來處理這個請求。
方法返回一個AccountManagerFuture對象,可解析出一個Bundle,包含以下信息:
- KEY_ACCOUNT_NAME: 創建的帳號的名稱
- KEY_ACCOUNT_TYPE: 帳號類型
本方法創建一個匿名AmsTask實例并啟動:
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return new AmsTask(activity, handler, callback) {
public void doWork() throws RemoteException {
mService.addAcount(mResponse, accountType, authTokenType,
requiredFeatures, activity != null, optionsIn);
}
}.start();
這里,以異步的方式請求AccountManagerService.addAccount()
start()方法立即返回,返回值是AccountManagerFuture類型的。
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AccountManagerService.addAccount()
這個方法中,創建一個Session類型的匿名實例,并調用其bind()方法,最終捆綁到應用程序提供的authenticator service:
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new Session(accounts, response, accountType, expectActivityLaunch,
true /* stripAuthTokenFromResult */) {
public void run() throws RemoteException {
mAuthenticator.addAccount(this, mAccountType, authTokenType, requiredFeatures,
options);
}
protected String toDebugString(long now) {
return super.toDebugString(now) + ", addAccount"
+ ", accountType " + accountType
+ ", requiredFeatures "
+ (requiredFeatures != null
? TextUtils.join(",", requiredFeatures)
: null);
}
}.bind();
這是Session.bind()方法的相關細節:
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void bind() {
...
if (!bindToAuthenticator(mAccountType)) {
Log.d(TAG, "bind attempt failed for " + toDebugString());
onError(AccountManager.ERROR_CODE_REMOTE_EXCEPTION, "bind failure");
}
}
bindToAuthenticator()方法找到對應的組件名稱(應用程序中定義的相關service),并且對Service發起綁定:
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private boolean bindToAuthenticator(String authenticatorType) {
final AccountAuthenticatorCache.ServiceInfo<AuthenticatorDescription> authenticatorInfo;
authenticatorInfo = mAuthenticatorCache.getServiceInfo(
AuthenticatorDescription.newKey(authenticatorType), mAccounts.userId);
...
Intent intent = new Intent();
intent.setAction(AccountManager.ACTION_AUTHENTICATOR_INTENT);
intent.setComponent(authenticatorInfo.componentName);
...
if (!mContext.bindService(intent, this, Context.BIND_AUTO_CREATE, mAccounts.userId)) {
...
}
return true;
}
Session類實現了ServiceConnection接口,因此,當成功綁定到對應的應用程序中的Service,其實現的onServiceConnected()方法將被調用:
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public void onServiceConnected(ComponentName name, IBinder service) {
mAuthenticator = IAccountAuthenticator.Stub.asInterface(service);
try {
run();
} catch (RemoteException e) {
onError(AccountManager.ERROR_CODE_REMOTE_EXCEPTION,
"remote exception");
}
}
這里的service,即是AbstractAuthenticator抽象類提供的IBinder:
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public abstract class AbstractAccountAuthenticator {
...
private class Transport extends IAccountAuthenticator.Stub {
public void addAccount(IAccountAuthenticatorResponse response, String accountType,
String authTokenType, String[] features, Bundle options)
throws RemoteException {
...
try {
final Bundle result = AbstractAccountAuthenticator.this.addAccount(
new AccountAuthenticatorResponse(response),
accountType, authTokenType, features, options);
...
}
...
}
...
}
...
private Transport mTransport = new Transport();
/**
* @return the IBinder for the AccountAuthenticator
*/
public final IBinder getIBinder() {
return mTransport.asBinder();
}
...
}
AbstractAccountAuthenticator的內部類Transport是IAccountAuthenticator接口的一個實現。后者規定了Authenticator的一組行為。
以添加帳號的操作為例,作為接口實現的Transport的addAccount()方法調用了AbstractAccountAuthenticator類的addAccount()抽象方法,這個方法的具體實現,則由應用程序中定義的authenticator子類來完成。
這里涉及到IPC,應用程序是服務端,提供服務的實現,而AccountManagerService則是客戶端,負責通過代理對象發起調用。
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Email的authenticator實現:
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class PopImapAuthenticator extends AbstractAccountAuthenticator {
...
@Override
public Bundle addAccount(AccountAuthenticatorResponse response, String accountType,
String authTokenType, String[] requiredFeatures, Bundle options)
throws NetworkErrorException {
// There are two cases here:
// 1) We are called with a username/password; this comes from the traditional email
// app UI; we simply create the account and return the proper bundle
if (options != null && options.containsKey(OPTIONS_PASSWORD)
&& options.containsKey(OPTIONS_USERNAME)) {
final Account account = new Account(options.getString(OPTIONS_USERNAME),
AccountManagerTypes.TYPE_POP_IMAP);
AccountManager.get(PopImapAuthenticatorService.this).addAccountExplicitly(
account, options.getString(OPTIONS_PASSWORD), null);
...
Bundle b = new Bundle();
b.putString(AccountManager.KEY_ACCOUNT_NAME, options.getString(OPTIONS_USERNAME));
b.putString(AccountManager.KEY_ACCOUNT_TYPE, AccountManagerTypes.TYPE_POP_IMAP);
return b;
// 2) The other case is that we're creating a new account from an Account manager
// activity. In this case, we add an intent that will be used to gather the
// account information...
} else {
Bundle b = new Bundle();
Intent intent =
AccountSetupBasics.actionSetupPopImapIntent(PopImapAuthenticatorService.this);
intent.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE, response);
b.putParcelable(AccountManager.KEY_INTENT, intent);
return b;
}
}
1) 如果是Email應用程序內部添加新的電子郵件帳號,此時已經取得了帳號的用戶名和密碼,那么直接創建對應的系統帳號,并調用AccountManager.addAccountExplicitly()將其添加到系統帳號數據庫中,并返回帳號名稱和類型。
2) 如果是從外部,比如系統設置中添加Email帳號,則創建指向Email應用中創建帳號對應的activity的Intent,并返回。這樣,AmsTask實例在完成時會通過Handler機制調用AddAccountSettings活動提交的一個回調:
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private AccountManagerCallback<Bundle> mCallback = new AccountManagerCallback<Bundle>() {
public void run(AccountManagerFuture<Bundle> future) {
boolean done = true;
try {
Bundle bundle = future.getResult();
//bundle.keySet();
Intent intent = (Intent) bundle.get(AccountManager.KEY_INTENT);
if (intent != null) {
done = false;
Bundle addAccountOptions = new Bundle();
addAccountOptions.putParcelable(KEY_CALLER_IDENTITY, mPendingIntent);
addAccountOptions.putBoolean(EXTRA_HAS_MULTIPLE_USERS,
Utils.hasMultipleUsers(AddAccountSettings.this));
intent.putExtras(addAccountOptions);
startActivityForResult(intent, ADD_ACCOUNT_REQUEST);
...
}
這樣就會啟動Email創建帳號的activity,之后又會走到1)中的步驟了。
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