android登录示例不起作用如何修复它

Question

我正在为android上的登录系统创建一个简单的测试，但问题是，无论我放入密码字段，系统将登录如何修复此错误?????

• 电子邮件= jammil@jamil.com
• 密码= jamil123

loginActivity

package com.exercise.AndroidNavigationTabs;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Activity which displays a login screen to the user, offering registration as
 * well.
 */
public class LoginActivity extends Activity {

    public static final String EXTRA_EMAIL = "com.example.android.authenticatordemo.extra.EMAIL";

    /**
     * Keep track of the login task to ensure we can cancel it if requested.
     */
    private UserLoginTask mAuthTask = null;

    // Values for email and password at the time of the login attempt.
    private String mEmail = "jamil@jamil.com";
    private String mPassword;

    // UI references.
    private EditText mEmailView;
    private EditText mPasswordView;
    private View mLoginFormView;
    private View mLoginStatusView;
    private TextView mLoginStatusMessageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_login);

        // Set up the login form.
        mEmail = getIntent().getStringExtra(EXTRA_EMAIL);
        mEmailView = (EditText) findViewById(R.id.email);
        mEmailView.setText(mEmail);

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

        mLoginFormView = findViewById(R.id.login_form);
        mLoginStatusView = findViewById(R.id.login_status);
        mLoginStatusMessageView = (TextView) findViewById(R.id.login_status_message);

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getMenuInflater().inflate(R.menu.login, menu);
        return true;
    }

    /**
     * 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() {
        if (mAuthTask != null) {
            return;
        }

        // Reset errors.
        mEmailView.setError(null);
        mPasswordView.setError(null);

        // Store values at the time of the login attempt.
        mEmail = mEmailView.getText().toString();
        mPassword = mPasswordView.getText().toString();

        boolean cancel = false;
        View focusView = null;

        // Check for a valid password.
        if (TextUtils.isEmpty(mPassword)) {
            mPasswordView.setError(getString(R.string.error_field_required));
            focusView = mPasswordView;
            cancel = true;
        } else if (mPassword.length() < 4) {
            mPasswordView.setError(getString(R.string.error_invalid_password));
            focusView = mPasswordView;
            cancel = true;
        }
        else if(mPassword != "jamil123"){
            mPasswordView.setError(getString(R.string.error_incorrect_password));
            focusView = mPasswordView;
            cancel = true;

        }

        // Check for a valid email address.
        if (TextUtils.isEmpty(mEmail)) {
            mEmailView.setError(getString(R.string.error_field_required));
            focusView = mEmailView;
            cancel = true;
        } else if (!mEmail.contains("@")) {
            mEmailView.setError(getString(R.string.error_invalid_email));
            focusView = mEmailView;
            cancel = true;
        }

        if (cancel) {
            // There was an error; don't attempt login and focus the first
            // form field with an error.
            focusView.requestFocus();
        } else {
            // Show a progress spinner, and kick off a background task to
            // perform the user login attempt.
            mLoginStatusMessageView.setText(R.string.login_progress_signing_in);
            showProgress(true);
            mAuthTask = new UserLoginTask();
            mAuthTask.execute((Void) null);

            Intent intent = new Intent(this, AndroidNavigationTabsActivity.class);
            startActivity(intent);

            Toast.makeText(getBaseContext(), "login Success", Toast.LENGTH_LONG).show();
        }
    }

    /**
     * Shows the progress UI and hides the login form.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    private void showProgress(final boolean show) {
        // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
        // for very easy animations. If available, use these APIs to fade-in
        // the progress spinner.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
            int shortAnimTime = getResources().getInteger(
                    android.R.integer.config_shortAnimTime);

            mLoginStatusView.setVisibility(View.VISIBLE);
            mLoginStatusView.animate().setDuration(shortAnimTime)
                    .alpha(show ? 1 : 0)
                    .setListener(new AnimatorListenerAdapter() {
                        @Override
                        public void onAnimationEnd(Animator animation) {
                            mLoginStatusView.setVisibility(show ? View.VISIBLE
                                    : View.GONE);
                        }
                    });

            mLoginFormView.setVisibility(View.VISIBLE);
            mLoginFormView.animate().setDuration(shortAnimTime)
                    .alpha(show ? 0 : 1)
                    .setListener(new AnimatorListenerAdapter() {
                        @Override
                        public void onAnimationEnd(Animator animation) {
                            mLoginFormView.setVisibility(show ? View.GONE
                                    : View.VISIBLE);
                        }
                    });
        } else {
            // The ViewPropertyAnimator APIs are not available, so simply show
            // and hide the relevant UI components.
            mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
        }
    }

    /**
     * Represents an asynchronous login/registration task used to authenticate
     * the user.
     */
    public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {
        @Override
        protected Boolean doInBackground(Void... params) {
            // TODO: attempt authentication against a network service.

            try {
                // Simulate network access.
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                return false;
            }

            for (String credential : DUMMY_CREDENTIALS) {
                String[] pieces = credential.split(":");
                if (pieces[0].equals(mEmail)) {
                    // Account exists, return true if the password matches.
                    return pieces[1].equals(mPassword);
                }
            }

            // TODO: register the new account here.
            return true;
        }

        @Override
        protected void onPostExecute(final Boolean success) {
            mAuthTask = null;
            showProgress(false);

            if (success) {
     //           finish(); 

            } else {
                mPasswordView
                        .setError(getString(R.string.error_incorrect_password));
                mPasswordView.requestFocus();
            }
        }

        @Override
        protected void onCancelled() {
            mAuthTask = null;
            showProgress(false);
        }
    }
}

Answer 1

对于字符串比较，您需要使用.equals（）。 所以你的行else if(mPassword != "jamil123")应该是else if(!mPassword.equals("jamil123")) 。

Answer 2

不要使用==或!=来比较字符串内容。 Strings是对象，相等运算符测试以查看两个对象是否是同一个对象。 这是一个长时间的讨论（谷歌的字符串实习），但有时候==工作。

相反，请使用!mPassword.equals("jamil123") 。

Answer 3

在UserLoginTask注意它将return true ，这就是为什么onPostExecute中的success将始终将登录验证为true。

Android会为您提供模板，但您可以根据需要进行调整。

---

这是一个例子

你在这里不变：

private boolean loginUser(String email, String Password) {
boolean isValid = false;

if(email.equals(mEmail) && Password.equals(mPassword))
{
   isValid = true;
}


return isValid;
}

然后创建一个验证它的函数，然后返回一个布尔值

public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {
    @Override
    protected Boolean doInBackground(Void... params) {
            return loginUser("jamil@jamil.com", "jamil123");
    }

    @Override
    protected void onPostExecute(final Boolean success) {
        mAuthTask = null;
        showProgress(false);

        if (success) {
                        //Success!!
        } else {
                       // fail :(
        }
    }

    @Override
    protected void onCancelled() {
        mAuthTask = null;
        showProgress(false);
    }
}

最后你有这样的asynctask：

 public class UserLoginTask extends AsyncTask<Void, Void, Boolean> { @Override protected Boolean doInBackground(Void... params) { return loginUser("jamil@jamil.com", "jamil123"); } @Override protected void onPostExecute(final Boolean success) { mAuthTask = null; showProgress(false); if (success) { //Success!! } else { // fail :( } } @Override protected void onCancelled() { mAuthTask = null; showProgress(false); } }