android - Activity 不从暂停返回

Question

我有一个包含三个 Activity 的应用程序:启动画面(默认)、登录、主要。该应用程序以启动画面开始，几秒钟后更改为登录。如果登录过程正确，那么我们将转到主程序。

我的问题是登录 Activity 无法从暂停状态恢复。当我按下主页按钮时， onPause() 被正确调用并且 onDestroy() 没有被调用。然后，当尝试返回到应用程序时，它从启动时开始但从未登录，它只是返回到主页。 logcat 没有显示任何错误，调试器指出应用程序仍处于打开状态(就像它应该的那样)。初始屏幕和主屏幕上的行为是预期的。

public class LoginActivity extends Activity {
/* UI ELEMENTS */
private OnClickListener mOnClickListener;

private EditText mPasswordField;

private EditText mUserField;

private ProgressDialog mProgressDialog;

/* LOGIC ELEMENTS */
/** handler to update interface */
private static Handler sInterfaceUpdateHandler;


public static class UpdateHandler extends Handler {

    private final WeakReference<LoginActivity> mLogin;

    UpdateHandler(final LoginActivity loginActivity) {
        super();
        mLogin = new WeakReference<LoginActivity>(loginActivity);
    }

    /**
     * handle events from other threads in UI thread.
     * 
     * @param message message data. Property what determines action.
     */
    @Override
    public void handleMessage(final Message message) {
       // STUFF HERE
    }


@Override
public void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.initializeInterface(); // fields filled here, listener added to buttons
}

编辑:根据请求在 SplashScreen 中创建 Activity

 public class SplashScreen extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.setContentView(R.layout.splashscreen);
    final Thread splashThread = new Thread() {
        @Override
        public void run() {
            try {
                int waited = 0;
                while (waited < 2000) {
                    sleep(100);
                    waited += 100;
                }
            } catch (final InterruptedException catchException) {
                LoggerFactory.consoleLogger().printStackTrace(catchException);
            }
            SplashScreen.this.finish();
            final Intent loginIntent = new Intent(SplashScreen.this, LoginActivity.class);
            SplashScreen.this.startActivity(loginIntent);
        }
    };
    splashThread.start();
}

Answer 1

发现并修复了错误。该 Activity 在 list 中被标记为 SingleInstance。我将其更改为 SingleTop，现在它按预期工作。

有关原因的更多文档可在此处找到:http://developer.android.com/guide/topics/manifest/activity-element.html#lmode