Question

如何将以下代码显示为欢迎而不是电子邮件？
当我将EMAIL更改为姓名时，它会显示null而不是名称任何帮助将不胜感激。

我尝试将电子邮件更改为名称，但这不起作用我不知道还能做什么。

UsersActivity.java（这是我想要更改的内容，因此它显示的是名称而不是电子邮件）

package com.delaroystudios.sqlitelogin.activities;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

import com.delaroystudios.sqlitelogin.R;


public class UsersActivity extends AppCompatActivity {

    private TextView textViewName;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_users);

        textViewName = (TextView) findViewById(R.id.text1);
        String nameFromIntent = getIntent().getStringExtra("NAME");
        textViewName.setText("Welcome " + nameFromIntent);
    }
}

LoginActivity.java

package com.delaroystudios.sqlitelogin.activities;

import android.content.Intent;
import android.support.design.widget.Snackbar;
import android.support.design.widget.TextInputEditText;
import android.support.design.widget.TextInputLayout;
import android.support.v4.widget.NestedScrollView;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.AppCompatButton;
import android.support.v7.widget.AppCompatTextView;
import android.view.View;

import com.delaroystudios.sqlitelogin.R;
import com.delaroystudios.sqlitelogin.helper.InputValidation;
import com.delaroystudios.sqlitelogin.sql.DatabaseHelper;

public class LoginActivity extends AppCompatActivity implements View.OnClickListener {

    private final AppCompatActivity activity = LoginActivity.this;

    private NestedScrollView nestedScrollView;

    private TextInputLayout textInputLayoutEmail;
    private TextInputLayout textInputLayoutPassword;

    private TextInputEditText textInputEditTextEmail;
    private TextInputEditText textInputEditTextPassword;

    private AppCompatButton appCompatButtonLogin;

    private AppCompatTextView textViewLinkRegister;

    private InputValidation inputValidation;
    private DatabaseHelper databaseHelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        getSupportActionBar().hide();

        initViews();
        initListeners();
        initObjects();
    }
    private void initViews(){
        nestedScrollView = (NestedScrollView) findViewById(R.id.nestedScrollView);

        textInputLayoutEmail = (TextInputLayout) findViewById(R.id.textInputLayoutEmail);
        textInputLayoutPassword = (TextInputLayout) findViewById(R.id.textInputLayoutPassword);

        textInputEditTextEmail = (TextInputEditText) findViewById(R.id.textInputEditTextEmail);
        textInputEditTextPassword = (TextInputEditText) findViewById(R.id.textInputEditTextPassword);

        appCompatButtonLogin = (AppCompatButton) findViewById(R.id.appCompatButtonLogin);

        textViewLinkRegister = (AppCompatTextView) findViewById(R.id.textViewLinkRegister);
    }

    private void initListeners(){
        appCompatButtonLogin.setOnClickListener(this);
        textViewLinkRegister.setOnClickListener(this);
    }

    private void initObjects(){
        databaseHelper = new DatabaseHelper(activity);
        inputValidation = new InputValidation(activity);
    }

    @Override
    public void onClick(View v){
        switch (v.getId()){
            case R.id.appCompatButtonLogin:
                verifyFromSQLite();
                break;
            case R.id.textViewLinkRegister:
                Intent intentRegister = new Intent(getApplicationContext(), RegisterActivity.class);
                startActivity(intentRegister);
                break;
        }
    }

    private void verifyFromSQLite(){
        if (!inputValidation.isInputEditTextFilled(textInputEditTextEmail, textInputLayoutEmail, getString(R.string.error_message_email))) {
            return;
        }
        if (!inputValidation.isInputEditTextEmail(textInputEditTextEmail, textInputLayoutEmail, getString(R.string.error_message_email))) {
            return;
        }
        if (!inputValidation.isInputEditTextFilled(textInputEditTextPassword, textInputLayoutPassword, getString(R.string.error_message_email))) {
            return;
        }

        if (databaseHelper.checkUser(textInputEditTextEmail.getText().toString().trim()
                , textInputEditTextPassword.getText().toString().trim())) {
            Intent accountsIntent = new Intent(activity, UsersActivity.class);
            accountsIntent.putExtra("EMAIL", textInputEditTextEmail.getText().toString().trim());
            emptyInputEditText();
            startActivity(accountsIntent);
        }

        else {
            Snackbar.make(nestedScrollView, getString(R.string.error_valid_email_password), Snackbar.LENGTH_LONG).show();
        }
    }

    private void emptyInputEditText(){
        textInputEditTextEmail.setText(null);
        textInputEditTextPassword.setText(null);
    }
}

RegisterActivity.java

package com.delaroystudios.sqlitelogin.activities;

import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.design.widget.TextInputEditText;
import android.support.design.widget.TextInputLayout;
import android.support.v4.widget.NestedScrollView;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.AppCompatButton;
import android.support.v7.widget.AppCompatTextView;
import android.view.View;

import com.delaroystudios.sqlitelogin.R;
import com.delaroystudios.sqlitelogin.helper.InputValidation;
import com.delaroystudios.sqlitelogin.model.User;
import com.delaroystudios.sqlitelogin.sql.DatabaseHelper;


public class RegisterActivity extends AppCompatActivity implements View.OnClickListener {

    private final AppCompatActivity activity = RegisterActivity.this;

    private NestedScrollView nestedScrollView;

    private TextInputLayout textInputLayoutName;
    private TextInputLayout textInputLayoutEmail;
    private TextInputLayout textInputLayoutPassword;
    private TextInputLayout textInputLayoutConfirmPassword;

    private TextInputEditText textInputEditTextName;
    private TextInputEditText textInputEditTextEmail;
    private TextInputEditText textInputEditTextPassword;
    private TextInputEditText textInputEditTextConfirmPassword;

    private AppCompatButton appCompatButtonRegister;
    private AppCompatTextView appCompatTextViewLoginLink;

    private InputValidation inputValidation;
    private DatabaseHelper databaseHelper;
    private User user;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        getSupportActionBar().hide();

        initViews();
        initListeners();
        initObjects();
    }

    private void initViews(){
        nestedScrollView = (NestedScrollView) findViewById(R.id.nestedScrollView);

        textInputLayoutName = (TextInputLayout) findViewById(R.id.textInputLayoutName);
        textInputLayoutEmail = (TextInputLayout) findViewById(R.id.textInputLayoutEmail);
        textInputLayoutPassword = (TextInputLayout) findViewById(R.id.textInputLayoutPassword);
        textInputLayoutConfirmPassword = (TextInputLayout) findViewById(R.id.textInputLayoutConfirmPassword);

        textInputEditTextName = (TextInputEditText) findViewById(R.id.textInputEditTextName);
        textInputEditTextEmail = (TextInputEditText) findViewById(R.id.textInputEditTextEmail);
        textInputEditTextPassword = (TextInputEditText) findViewById(R.id.textInputEditTextPassword);
        textInputEditTextConfirmPassword = (TextInputEditText) findViewById(R.id.textInputEditTextConfirmPassword);

        appCompatButtonRegister = (AppCompatButton) findViewById(R.id.appCompatButtonRegister);

        appCompatTextViewLoginLink = (AppCompatTextView) findViewById(R.id.appCompatTextViewLoginLink);
    }

    private void initListeners(){
        appCompatButtonRegister.setOnClickListener(this);
        appCompatTextViewLoginLink.setOnClickListener(this);
    }

    private void initObjects(){
        inputValidation = new InputValidation(activity);
        databaseHelper = new DatabaseHelper(activity);
        user = new User();
    }

    @Override
    public void onClick(View v){
        switch (v.getId()){
            case R.id.appCompatButtonRegister:
                postDataToSQLite();
                break;
            case R.id.appCompatTextViewLoginLink:
                finish();
                break;
        }
    }

    private void postDataToSQLite(){
        if (!inputValidation.isInputEditTextFilled(textInputEditTextName, textInputLayoutName, getString(R.string.error_message_name))) {
            return;
        }
        if (!inputValidation.isInputEditTextFilled(textInputEditTextEmail, textInputLayoutEmail, getString(R.string.error_message_email))) {
            return;
        }
        if (!inputValidation.isInputEditTextEmail(textInputEditTextEmail, textInputLayoutEmail, getString(R.string.error_message_email))) {
            return;
        }
        if (!inputValidation.isInputEditTextFilled(textInputEditTextPassword, textInputLayoutPassword, getString(R.string.error_message_password))) {
            return;
        }
        if (!inputValidation.isInputEditTextMatches(textInputEditTextPassword, textInputEditTextConfirmPassword,
                textInputLayoutConfirmPassword, getString(R.string.error_password_match))) {
            return;
        }

        if (!databaseHelper.checkUser(textInputEditTextEmail.getText().toString().trim())) {

            user.setName(textInputEditTextName.getText().toString().trim());
            user.setEmail(textInputEditTextEmail.getText().toString().trim());
            user.setPassword(textInputEditTextPassword.getText().toString().trim());

            databaseHelper.addUser(user);

            // Snack Bar to show success message that record saved successfully
            Snackbar.make(nestedScrollView, getString(R.string.success_message), Snackbar.LENGTH_LONG).show();
            emptyInputEditText();


        } else {
            // Snack Bar to show error message that record already exists
            Snackbar.make(nestedScrollView, getString(R.string.error_email_exists), Snackbar.LENGTH_LONG).show();
        }


    }

    private void emptyInputEditText(){
        textInputEditTextName.setText(null);
        textInputEditTextEmail.setText(null);
        textInputEditTextPassword.setText(null);
        textInputEditTextConfirmPassword.setText(null);
    }

}

InputValidation.java

package com.delaroystudios.sqlitelogin.helper;

import android.app.Activity;
import android.content.Context;
import android.support.design.widget.TextInputEditText;
import android.support.design.widget.TextInputLayout;
import android.util.Patterns;
import android.view.View;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;


public class InputValidation {

    private Context context;

    public InputValidation(Context context){
        this.context = context;
    }

    public boolean isInputEditTextFilled(TextInputEditText textInputEditText, TextInputLayout textInputLayout, String message){
        String value = textInputEditText.getText().toString().trim();
        if (value.isEmpty()){
            textInputLayout.setError(message);
            hideKeyboardFrom(textInputEditText);
            return false;
        } else {
            textInputLayout.setErrorEnabled(false);
        }
        return true;
    }

    public boolean isInputEditTextEmail(TextInputEditText textInputEditText, TextInputLayout textInputLayout, String message){
        String value = textInputEditText.getText().toString().trim();
        if (value.isEmpty() || !Patterns.EMAIL_ADDRESS.matcher(value).matches()){
            textInputLayout.setError(message);
            hideKeyboardFrom(textInputEditText);
            return false;

        }else {
            textInputLayout.setErrorEnabled(false);
        }
        return true;
    }

    public boolean isInputEditTextMatches(TextInputEditText textInputEditText1, TextInputEditText textInputEditText2, TextInputLayout textInputLayout, String message ){
        String value1 = textInputEditText1.getText().toString().trim();
        String value2 = textInputEditText2.getText().toString().trim();
        if (!value1.contentEquals(value2)){
            textInputLayout.setError(message);
            hideKeyboardFrom(textInputEditText2);
            return false;
        }else {
            textInputLayout.setErrorEnabled(false);
        }
        return true;
    }

    private void hideKeyboardFrom(View view){
        InputMethodManager imm = (InputMethodManager) context.getSystemService(Activity.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(view.getWindowToken(), WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
    }
}

User.java

package com.delaroystudios.sqlitelogin.model;


public class User {

    private int id;
    private String name;
    private String email;
    private String password;

    public int getId(){
        return id;
    }

    public void setId(int id){
        this.id = id;
    }

    public String getName(){
        return name;
    }

    public void setName(String name){
        this.name = name;
    }

    public String getEmail(){
        return email;
    }

    public void setEmail(String email){
        this.email = email;
    }

    public String getPassword(){
       return password;
    }

    public void setPassword(String password){
        this.password = password;
    }
}

Databasehelper.java

package com.delaroystudios.sqlitelogin.sql;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import com.delaroystudios.sqlitelogin.model.User;


public class DatabaseHelper  extends SQLiteOpenHelper{

    private static final int DATABASE_VERSION = 1;

    private static final String DATABASE_NAME = "UserManager.db";

    private static final String TABLE_USER = "user";

    private static final String COLUMN_USER_ID = "user_id";
    private static final String COLUMN_USER_NAME = "user_name";
    private static final String COLUMN_USER_EMAIL = "user_email";
    private static final String COLUMN_USER_PASSWORD = "user_password";

    private String CREATE_USER_TABLE = "CREATE TABLE " + TABLE_USER + "("
            + COLUMN_USER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + COLUMN_USER_NAME + " TEXT,"
            + COLUMN_USER_EMAIL + " TEXT," + COLUMN_USER_PASSWORD + " TEXT" + ")";

    private String DROP_USER_TABLE = "DROP TABLE IF EXISTS " + TABLE_USER;

    public DatabaseHelper(Context context){
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db){
        db.execSQL(CREATE_USER_TABLE);
    }

    @Override
    public  void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
        db.execSQL(DROP_USER_TABLE);
        onCreate(db);
    }

    public void addUser(User user){
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(COLUMN_USER_NAME, user.getName());
        values.put(COLUMN_USER_EMAIL, user.getEmail());
        values.put(COLUMN_USER_PASSWORD, user.getPassword());

        db.insert(TABLE_USER, null, values);
        db.close();
    }

    public boolean checkUser(String email){
        String[] columns = {
                COLUMN_USER_ID
        };
        SQLiteDatabase db = this.getWritableDatabase();
        String selection = COLUMN_USER_EMAIL + " = ?";
        String[] selectionArgs = { email };

        Cursor cursor = db.query(TABLE_USER,
                columns,
                selection,
                selectionArgs,
                null,
                null,
                null);
        int cursorCount = cursor.getCount();
        cursor.close();
        db.close();

        if (cursorCount > 0){
            return true;
        }
        return false;
    }

    public boolean checkUser(String email, String password){
        String[] columns = {
                COLUMN_USER_ID
        };
        SQLiteDatabase db = this.getWritableDatabase();
        String selection = COLUMN_USER_EMAIL + " = ?" + " AND " + COLUMN_USER_PASSWORD + " =?";
        String[] selectionArgs = { email, password };

        Cursor cursor = db.query(TABLE_USER,
                columns,
                selection,
                selectionArgs,
                null,
                null,
                null);
        int cursorCount = cursor.getCount();
        cursor.close();
        db.close();

        if (cursorCount > 0){
            return true;
        }
        return false;
    }
}

Answer 1

将名称显示为欢迎而不是电子邮件

然后输入正确的值

您正在发送电子邮件

accountsIntent.putExtra("EMAIL", textInputEditTextEmail.getText().toString().trim());

试图获得一个名字

String nameFromIntent = getIntent().getStringExtra("NAME");

为了帮助您，请尝试使用此代码

String email = textInputEditTextEmail.getText().toString().trim();
String password = textInputEditTextPassword.getText().toString().trim();

User user = databaseHelper.checkUser(email, password);
if (user != null) {
    Intent accountsIntent = new Intent(activity, UsersActivity.class);
    accountsIntent.putExtra("NAME", user.getName());
    emptyInputEditText();
    startActivity(accountsIntent);
}

哦，应避免将纯文本密码存储在数据库中

我的应用会显示名称而不是电子邮件

1 个答案: