Question

非常令人沮丧的问题。在eclipse的图形布局视图中，它显示整个屏幕已填满，但是当我在模拟器中启动它时，只有大约一半的屏幕被填满。它会在最后一个按钮之后填充到右边。我一直试图解决这个问题几个小时！我试过清理项目重新启动eclipse启动项目。谢谢！

这是XML代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            style="@style/LoginFormContainer"
    android:layout_height="fill_parent"
            android:orientation="vertical"
    android:background="#f1c40f">

            <EditText
                android:id="@+id/username"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/usernameHint"
                android:maxLines="1"
                android:singleLine="true" />

            <EditText
                android:id="@+id/password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/prompt_password"
                android:imeActionId="@+id/login"
                android:imeActionLabel="@string/action_sign_in_short"
                android:imeOptions="actionUnspecified"
                android:inputType="textPassword"
                android:maxLines="1"
                android:singleLine="true" />

            <Button
                android:id="@+id/sign_in_button"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:layout_marginTop="16dp"
                android:text="@string/action_sign_in_short" />


            <TextView
                android:id="@+id/orTV"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:text="@string/orText"
                android:layout_marginTop="16dp"
            />

            <Button
                android:id="@+id/register_button"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:layout_marginTop="16dp"
                android:text="@string/action_register" />
</LinearLayout>

以下是我用来启动此文件的Java代码。虽然它也发生在其他文件上。

package com.keyconsultant.parse.logintutorial;

import java.util.Locale;

import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.TextView;

import com.keyconsultant.parse.logintutorial.error.UnknownErrorDialogFactory;
import com.keyconsultant.parse.logintutorial.fragment.BaseFragment;
import com.keyconsultant.parse.logintutorial.model.user.UserManager;
import com.keyconsultant.parse.logintutorial.model.user.authenticate.AuthenticateUserErrorEvent;
import com.parse.ParseException;
import com.squareup.otto.Subscribe;

/**
 * Fragment for logging in. Includes button for loading the Create account view. 
 * 
 * @author Trey Robinson
 *
 */
public class LoginFragment extends BaseFragment {

    public static final String EXTRA_USERNAME = "com.keyconsultant.parse.logintutorial.activity.extra.USERNAME";
    public static final String EXTRA_PASSWORD = "com.keyconsultant.parse.logintutorial.activity.extra.PASSWORD";

    // UI references.
    private EditText mUserNameEditText;
    private EditText mPasswordEditText;

    /**
     * Factory method for creating new fragments
     * @return
     */
    public static LoginFragment newInstance(){
        return new LoginFragment();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {


        View view = inflater.inflate(R.layout.fragment_login, container, false);
        mUserNameEditText = (EditText) view.findViewById(R.id.username);

        mPasswordEditText = (EditText) view.findViewById(R.id.password);
        mPasswordEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
                if (id == EditorInfo.IME_NULL) {
                    attemptLogin();
                    return true;
                }
                return false;
            }
        });

        view.findViewById(R.id.sign_in_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                attemptLogin();
            }
        });

        view.findViewById(R.id.register_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                createAccount();
            }
        });
        return view;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        if(savedInstanceState != null){
            mUserNameEditText.setText(savedInstanceState.getString(EXTRA_USERNAME));
            mPasswordEditText.setText(savedInstanceState.getString(EXTRA_PASSWORD));
        }
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString(EXTRA_USERNAME, mUserNameEditText.getText().toString());
        outState.putString(EXTRA_PASSWORD, mPasswordEditText.getText().toString());
    }

    /**
     * Attempts to sign in or register the account specified by the login form.
     * If there are form errors (invalid email, missing fields, etc.), the
     * errors are presented and no actual login attempt is made.
     */
    public void attemptLogin() {

        clearErrors();

        // Store values at the time of the login attempt.
        String username = mUserNameEditText.getText().toString();
        String password = mPasswordEditText.getText().toString();

        boolean cancel = false;
        View focusView = null;

        // Check for a valid password.
        if (TextUtils.isEmpty(password)) {
            mPasswordEditText.setError(getString(R.string.error_field_required));
            focusView = mPasswordEditText;
            cancel = true;
        } else if (password.length() < 4) {
            mPasswordEditText.setError(getString(R.string.error_invalid_password));
            focusView =mPasswordEditText;
            cancel = true;
        }

        // Check for a valid email address.
        if (TextUtils.isEmpty(username)) {
            mUserNameEditText.setError(getString(R.string.error_field_required));
            focusView = mUserNameEditText;
            cancel = true;
        }

        if (cancel) {
            // There was an error; don't attempt login and focus the first
            // form field with an error.
            focusView.requestFocus();
        } else {
            // perform the user login attempt.
            UserManager.getInstance().authenticate(username.toLowerCase(Locale.getDefault()), password);
        }
    }

    /**
     * Load the create account view. 
     */
    private void createAccount(){
        FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
        fragmentTransaction.replace(((ViewGroup)getView().getParent()).getId(), CreateAccountFragment.newInstance());
        fragmentTransaction.addToBackStack(null);
        fragmentTransaction.commit();
    }

    /**
     * Remove all edit text errors
     */
    private void clearErrors(){
        mUserNameEditText.setError(null);
        mPasswordEditText.setError(null);
    }

    @Subscribe
    public void onSignInError(AuthenticateUserErrorEvent event){
        clearErrors();
        switch (event.getErrorCode()) {
        case ParseException.OBJECT_NOT_FOUND:
            mPasswordEditText.setError(getString(R.string.error_incorrect_password));
            mPasswordEditText.requestFocus();
            break;
        default:
            UnknownErrorDialogFactory.createUnknownErrorDialog(this.getActivity()).show();
            break;
        }
    }
}

Answer 1

似乎你缺少android：layout_width =“match_parent”为你最顶层的视图容器。

希望这有帮助。

为什么背景颜色拒绝填满整个屏幕

1 个答案: