如何強制android啓動LoginActivity

Question

如果沒有帳戶存在，我想迫使我的應用程序運行LoginActivity。

我已經完成了以下工作，但仍然在模擬器中啓動應用程序時，我有MainActivityTest出現。

現在我沒有帳戶在模擬器上的我的應用程序，所以我希望只是看到登錄屏幕。然而，我所看到的好像MainActivityTest運行

public class AccountAuthenticator extends AbstractAccountAuthenticator { 
    private Context context; 
    private static final String TAG = "AccountAuthenticator"; 
    public AccountAuthenticator(final Context context) { 
     super(context); 
     this.context = context; 
    } 

    @Override 
    public Bundle addAccount(final AccountAuthenticatorResponse response, 
          final String accountType, final String authTokenType, 
          final String[] requiredFeatures, final Bundle options) throws NetworkErrorException { 
     final Intent intent = new Intent(context, LoginActivity.class); 
     final Bundle bundle = new Bundle(); 
     bundle.putParcelable(KEY_INTENT, intent); 
     return bundle; 

    } 
    ... 
} 

public class AccountAuthenticatorService extends Service { 

    private static AccountAuthenticator AUTHENTICATOR; 

    public IBinder onBind(Intent intent) { 
     return intent.getAction().equals(ACTION_AUTHENTICATOR_INTENT) ? getAuthenticator() 
       .getIBinder() : null; 
    } 

    private AccountAuthenticator getAuthenticator() { 
     if (AUTHENTICATOR == null) 
      AUTHENTICATOR = new AccountAuthenticator(this); 
     return AUTHENTICATOR; 
    } 
} 

public class LoginActivity extends RoboSherlockAccountAuthenticatorActivity { 
    @Override 
    public void startActivity(Intent intent) { 
     if (intent != null && ACTION_VIEW.equals(intent.getAction())) 
      intent.addCategory(CATEGORY_BROWSABLE); 
     super.startActivity(intent); 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.login); 
    } 
} 

我AndroidManifest.xml就像下面

<application 
      android:icon="@drawable/ic_launcher" 
      android:label="myapp" > 
     <activity 
     android:name=".ui.ui.MainActivityTest" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
     </activity> 

    <service 
     android:name="com.myapp.AccountAuthenticatorService" 
     android:exported="false" 
     android:process=":auth" > 
     <intent-filter> 
      <action android:name="android.accounts.AccountAuthenticator" /> 
     </intent-filter> 

     <meta-data 
      android:name="android.accounts.AccountAuthenticator" 
      android:resource="@xml/authenticator" /> 
    </service> 
    <activity 
     android:name="com.myapp.LoginActivity" 
     android:configChanges="orientation|keyboardHidden|screenSize" 
     android:excludeFromRecents="true" > 
     <!-- 
      No intent-filter here! This activity is only ever launched by 
      someone who explicitly knows the class name 
     --> 
    </activity> 
    </application 
<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.GET_ACCOUNTS" /> 
<uses-permission android:name="android.permission.MANAGE_ACCOUNTS" /> 
<uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" /> 
<uses-permission android:name="android.permission.READ_SYNC_SETTINGS" /> 
<uses-permission android:name="android.permission.READ_SYNC_STATS" /> 
<uses-permission android:name="android.permission.USE_CREDENTIALS" /> 
<uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS" /> 

Answer 1

當您啓動在模擬器中的應用程序，MainActivityTest上來了，因爲你的AndroidManifest有：

<activity 
    android:name=".ui.ui.MainActivityTest" 
    android:label="@string/app_name" > 
    <intent-filter> 
     <action android:name="android.intent.action.MAIN" /> 
     <category android:name="android.intent.category.LAUNCHER" /> 
    </intent-filter> 
    </activity> 

如果您想默認啓動LoginActivity，請使用

<activity 
    android:name="com.myapp.LoginActivity" 
    android:configChanges="orientation|keyboardHidden|screenSize" 
    android:excludeFromRecents="true" > 
    <intent-filter> 
     <action android:name="android.intent.action.MAIN" /> 
     <category android:name="android.intent.category.LAUNCHER" /> 
    </intent-filter> 
    </activity> 

另外，如果你想顯示LoginActivity基於某些條件下，第一個活動，然後

1. 在Android清單，保持MainActivityTest作爲默認 活動
2. 在MainActivityTest->的onCreate，檢查條件爲 ，如果條件成立，則啓動LoginActivity

Answer 2

如果您在完成登錄過程後將值設置爲共享首選項，那將很簡單。 每當你啓動應用程序時，檢查一次sharedpreference值，並導航到活動

Boolean mobile_register_flag = sharedpref.getBoolean("mobile_register_flag", false); 

if (!mobile_register_flag) { 
      Intent intent = new Intent(FlashView.this, 
        RegisterActivity.class); 
      startActivity(intent); 
     } else { 
      Intent intent = new Intent(FlashView.this, 
        ActivityTwo.class); 
      startActivity(intent); 
     }