android – 当焦点从EditText更改为Button时,ActionBarSherlock操作栏消失

我有一个简单的登录布局,包含两个EditText字段和一个要登录的按钮.问题是当软键盘打开时ActionBar消失,我将焦点从EditText更改为Button,当我按下时ActionBar再次返回.当软键盘关闭并且我使用DPAD浏览EditTexts和Button时,不会发生此问题.

我使用ActionBarSherlock,问题只出现在Android 2.x模拟器上,在4.x模拟器上一切正常.我知道ActionBarSherlock在可用的Android版本上使用本机ActionBar实现,因此它可能是ActionBarSherlock代码的问题.

我还执行了一个测试来检查ActionBar.isShowing()的值,但即使在屏幕上看不到ActionBar,它也会返回true.

我无法弄清楚在这种情况下发生了什么,有人有想法吗？

布局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"
    tools:ignore="Uselessparent" >

    <LinearLayout
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:orientation="vertical" >

        <EditText
            android:id="@+id/username"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:hint="@string/username"
            android:inputType="textNoSuggestions"
            android:nextFocusUp="@+id/loginButton"
            android:imeOptions="actionNext" />

        <EditText
            android:id="@+id/password"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:hint="@string/password"
            android:inputType="textPassword"
            android:imeOptions="actionDone" />

        <Button
            android:id="@+id/loginButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:text="@string/login"
            android:textSize="20sp"
            android:nextFocusDown="@+id/username" />

    </LinearLayout>

</RelativeLayout>

碎片代码

public class LoginFragment extends BaseFragment {

    @InjectView(R.id.loginButton) protected Button mLoginButton;
    @InjectView(R.id.username) protected EditText mUsernameEditText;
    @InjectView(R.id.password) protected EditText mPasswordEditText;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.login, container, false);
    }

    @Override
    public void onStart() {
        super.onStart();

        mLoginButton.setEnabled(allFieldsValid());
        mLoginButton.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                handleLogin();
            }
        });

        mPasswordEditText.setonEditorActionListener(new TextView.OnEditorActionListener() {

            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if (actionId == EditorInfo.IME_ACTION_DONE && allFieldsValid()) {
                    handleLogin();
                }
                return false;
            }
        });

        TextWatcher fieldValidatorTextWatcher = new TextWatcher() {
            @Override
            public void afterTextChanged(Editable s) {
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                mLoginButton.setEnabled(allFieldsValid());
            }
        };

        mUsernameEditText.addTextChangedListener(fieldValidatorTextWatcher);
        mPasswordEditText.addTextChangedListener(fieldValidatorTextWatcher);
    }

    private void handleLogin() {
        getSherlockActivity().setSupportProgressBarIndeterminateVisibility(true);

        Intent intent = new Intent(getActivity(), LoginService.class);
        intent.putExtra(BaseIntentService.EXTRA_STATUS_RECEIVER, mResultReceiver);
        intent.putExtra(LoginService.ParaM_USERNAME, mUsernameEditText.getText().toString());
        intent.putExtra(LoginService.ParaM_PASSWORD, mPasswordEditText.getText().toString());
        getActivity().startService(intent);
    }

    private boolean allFieldsValid() {
        return usernameFieldisValid() && passwordFieldisValid();
    }

    private boolean usernameFieldisValid() {
        return !TextUtils.isEmpty(mUsernameEditText.getText());
    }

    private boolean passwordFieldisValid() {
        return !TextUtils.isEmpty(mPasswordEditText.getText());
    }

    @Override
    public void onReceiveResult(int resultCode, Bundle resultData) {
        getSherlockActivity().setSupportProgressBarIndeterminateVisibility(false);
        super.onReceiveResult(resultCode, resultData);
    }

    @Override
    public void onReceiveResultSuccess(Bundle resultData) {
        ((LoginActivity) getActivity()).redirectToSelectTeamwebActivity(resultData.getInt(LoginService.RESULT_USER_ID));
    }

    @Override
    public void onReceiveResultFailure(Bundle resultData) {
        mPasswordEditText.setText("");
        String errorMessage = getString(R.string.invalid_login_credentials);
        Toast.makeText(getActivity(), errorMessage, Toast.LENGTH_LONG).show();
    }

}

解决方法:

ActionBarSherlock在内容视图内部的pre-ICS上附加兼容性操作栏,而不是在Window的装饰视图中.因此,它可能会带来更多不便,可能会导致您所看到的意外行为.

如果您已将windowSoftInputMode设置为在IME打开时平移内容视图,则操作栏将从屏幕上消失.解决这个问题的简单方法是使用不同的模式(例如,调整大小),该模式将重新布局内容视图并将操作栏保持在屏幕上.