如何使用SharedPreferences来存储用户的电子邮件和密码

问题描述：

只是说，即时通讯新的android proggaming，我想要做的只是存储电子邮件，并通过如果用户检查检查“checarSessao”复选框，并保持记录，如果他关闭应用程序，当他再次打开，我想展现Home会自动代替再次登录屏幕...如何使用SharedPreferences来存储用户的电子邮件和密码

这里是我的登录

package complete.lyne.myapplication; 

import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.graphics.BitmapFactory; 
import android.graphics.Color; 
import android.net.ConnectivityManager; 
import android.net.NetworkInfo; 
import android.os.AsyncTask; 
import android.preference.PreferenceManager; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.CheckBox; 
import android.widget.EditText; 
import android.widget.TextView; 
import android.widget.Toast; 
import java.io.IOException; 

public class Login extends AppCompatActivity { 

EditText loginEmail, loginSenha; 
Button btLogar; 
TextView refCadastrar; 

String url = ""; 
String parametro = ""; 

private Session session; 
private CheckBox checkBox; 

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

    loginEmail = (EditText)findViewById(R.id.loginEmail); 
    loginSenha = (EditText)findViewById(R.id.loginSenha); 
    btLogar = (Button)findViewById(R.id.btLogar); 
    refCadastrar = (TextView)findViewById(R.id.refCadastrar); 
    checkBox = (CheckBox)findViewById(R.id.checarSessao); 

    refCadastrar.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent abreCadastro = new Intent(Login.this, Cadastro.class); 
      startActivity(abreCadastro); 
     } 
    }); 

    checkBox = (CheckBox) findViewById(R.id.checarSessao); 
    if (!new Session(this).Logado()) { 
     //user's email and password both are saved in preferences 
     startActivity(new Intent(Login.this, Home.class)); 
    } 


    btLogar.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      ConnectivityManager connectivityManager = (ConnectivityManager) 
        getSystemService(Context.CONNECTIVITY_SERVICE); 
      NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); 

      if (networkInfo != null && networkInfo.isConnected()) { 

       String email = loginEmail.getText().toString(); 
       String senha = loginSenha.getText().toString(); 

       if(email.isEmpty() && senha.matches(".*[a-z].*")) { 
        loginEmail.setError("Insira seu endereço de Email."); 
       } else if (email.matches(".*[a-z].*") && senha.isEmpty()) { 
        loginSenha.setError("Insira sua Senha."); 
       } else if (email.isEmpty() && senha.isEmpty()) { 
         Toast.makeText(getApplicationContext(), "Nenhum campo pode ficar vazio.", Toast.LENGTH_LONG).show(); 
       } else { 

        // Casa 
        url = "http://192.168.1.103/lyne/logar.php"; 

        // Badran 
        // url = "http://172.16.2.15/lyne/logar.php"; 

        parametro = "email=" + email + "&senha=" + senha; 

        new SolicitaDados().execute(url); 

       } 

      } else { 
       Toast.makeText(getApplicationContext(), "Nenhuma conexão com a Internet foi encontrada.", Toast.LENGTH_LONG).show(); 
      } 


     } 
    }); 
    } 

private class SolicitaDados extends AsyncTask<String, Void, String> { 
    @Override 
    protected String doInBackground(String... urls) { 

      return Conexao.postDados(urls[0], parametro); 

    } 

    @Override 
    protected void onPostExecute(String resultado) { 

     if(resultado != null) { 
      if (resultado.contains("login_ok")) { 

       String[] dados = resultado.split(","); 

       Intent abreHome = new Intent(Login.this, Home.class); 

       abreHome.putExtra("idusu", dados[0]); 
       abreHome.putExtra("nomeusu", dados[1]); 
       abreHome.putExtra("sobreusu", dados[2]); 
       abreHome.putExtra("emailusu", dados[3]); 
       abreHome.putExtra("senhausu", dados[4]); 

       String email = loginEmail.getText().toString(); 
       String password = loginSenha.getText().toString(); 

       if (checkBox.isChecked()) { 
        salvarLogin(email, password); 
        startActivity(abreHome); 
        finish(); 
       } 

       overridePendingTransition(android.R.anim.fade_out, android.R.anim.fade_in); 

       startActivity(abreHome); 
       finish(); 
      } else { 
       Toast.makeText(getApplicationContext(), "Usuário ou senha incorretos.", Toast.LENGTH_LONG).show(); 
      } 
     } 
    } 

} 

private void salvarLogin(String email, String password) { 
    new Session(this).salvarLogin(email, password); 
} 

}

这里是我的会话

package complete.lyne.myapplication; 

import android.content.Context; 
import android.content.SharedPreferences; 

/** 
* Created by Higor on 10/08/2017. 
*/ 

public class Session { 

Context context; 

Session(Context context) { 
    this.context = context; 
} 

public void salvarLogin(String email, String senha) { 
    SharedPreferences sharedPreferences = context.getSharedPreferences("LoginDetails", Context.MODE_PRIVATE); 
    SharedPreferences.Editor editor = sharedPreferences.edit(); 
    editor.putString("Email", email); 
    editor.putString("Senha", senha); 
    editor.commit(); 
} 

public String getEmail() { 
    SharedPreferences sharedPreferences = context.getSharedPreferences("LoginDetails", Context.MODE_PRIVATE); 
    return sharedPreferences.getString("Email", ""); 
} 

public boolean Logado() { 
    SharedPreferences sharedPreferences = context.getSharedPreferences("LoginDetails", Context.MODE_PRIVATE); 
    boolean isEmailEmpty = sharedPreferences.getString("Email", "").isEmpty(); 
    boolean isPasswordEmpty = sharedPreferences.getString("Password", "").isEmpty(); 
    return isEmailEmpty || isPasswordEmpty; 
} 
}

我的主页

package complete.lyne.myapplication; 

import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.preference.PreferenceManager; 
import android.support.annotation.NonNull; 
import android.support.design.widget.NavigationView; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBar; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.Toolbar; 
import android.text.Layout; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.TextView; 
import android.widget.Toast; 
import static complete.lyne.myapplication.R.layout.header_navegacao; 

public class Home extends AppCompatActivity { 


// Fragmentos 

FragmentTransaction fragmentTransaction; 
NavigationView navigationView; 

// Fim dos Fragmentos 

TextView bdNome; 
String uNome; 

private DrawerLayout drawerLayout; 
private ActionBarDrawerToggle aToggle; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.home); 
    Home.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out); 

    drawerLayout = (DrawerLayout)findViewById(R.id.DrawerLayout); 
    aToggle = new ActionBarDrawerToggle(this, drawerLayout, R.string.abrir, R.string.fechar); 

    navigationView = (NavigationView)findViewById(R.id.navigation_view); 
    View header = navigationView.getHeaderView(0); 
    bdNome = (TextView) header.findViewById(R.id.bdNome); 
    uNome = getIntent().getExtras().getString("nomeusu"); 
    bdNome.setText(uNome); 

    drawerLayout.addDrawerListener(aToggle); 
    aToggle.syncState(); 

    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

    // Fragmentos 

    fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
    fragmentTransaction.add(R.id.main_container,new HomeFragment()); 
    fragmentTransaction.commit(); 
    getSupportActionBar().setTitle("Line"); 
    navigationView = (NavigationView)findViewById(R.id.navigation_view); 
    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() { 
     @Override 
     public boolean onNavigationItemSelected(@NonNull MenuItem item) { 
      switch (item.getItemId()) { 

       case R.id.mConta: 
        fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
        fragmentTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out); 
        fragmentTransaction.replace(R.id.main_container,new ContaFragment()); 
        fragmentTransaction.addToBackStack("tag"); 
        fragmentTransaction.commit(); 
        getSupportActionBar().setTitle("Minha Conta"); 
        item.setChecked(true); 
        drawerLayout.closeDrawers(); 
        break; 

       case R.id.mPerfil: 
        fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
        fragmentTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out); 
        fragmentTransaction.replace(R.id.main_container,new PerfilFragment()); 
        fragmentTransaction.addToBackStack("tag"); 
        fragmentTransaction.commit(); 
        getSupportActionBar().setTitle("Perfil"); 
        item.setChecked(true); 
        drawerLayout.closeDrawers(); 
        break; 

       case R.id.mAmigos: 
        fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
        fragmentTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out); 
        fragmentTransaction.replace(R.id.main_container,new AmigosFragment()); 
        fragmentTransaction.addToBackStack("tag"); 
        fragmentTransaction.commit(); 
        getSupportActionBar().setTitle("Amigos"); 
        item.setChecked(true); 
        drawerLayout.closeDrawers(); 
        break; 

       case R.id.mSobre: 
        fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
        fragmentTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out); 
        fragmentTransaction.replace(R.id.main_container,new SobreFragment()); 
        fragmentTransaction.addToBackStack("tag"); 
        fragmentTransaction.commit(); 
        getSupportActionBar().setTitle("Sobre"); 
        item.setChecked(true); 
        drawerLayout.closeDrawers(); 
        break; 

       case R.id.mSair: 
        fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
        fragmentTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out); 
        fragmentTransaction.replace(R.id.main_container,new SobreFragment()); 
        fragmentTransaction.addToBackStack("tag"); 
        fragmentTransaction.commit(); 
        item.setChecked(true); 
        drawerLayout.closeDrawers(); 
        break; 

      } 

      return true; 
     } 
    }); 

    // Fim Fragmentos 

} 


@Override 
public boolean onOptionsItemSelected(MenuItem item) { 

    if(aToggle.onOptionsItemSelected(item)){ 
     return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 

public void onBackPressed() { 
    DrawerLayout layout = (DrawerLayout)findViewById(R.id.DrawerLayout); 
    Home.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out); 
    if (layout.isDrawerOpen(GravityCompat.START)) { 
     layout.closeDrawer(GravityCompat.START); 
    } else { 
     super.onBackPressed(); 
    } 
} 

}

SOLUTION

package complete.lyne.myapplication; 

import android.app.Activity; 
import android.app.Application; 
import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.graphics.BitmapFactory; 
import android.graphics.Color; 
import android.net.ConnectivityManager; 
import android.net.NetworkInfo; 
import android.os.AsyncTask; 
import android.preference.PreferenceManager; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.CheckBox; 
import android.widget.EditText; 
import android.widget.TextView; 
import android.widget.Toast; 

import java.io.IOException; 

public class Login extends AppCompatActivity { 

EditText loginEmail, loginSenha; 
Button btLogar; 
TextView refCadastrar; 

String url = ""; 
String parametro = ""; 

private CheckBox checkBox; 

public static final String info_usuario = "info_usuario"; 
public static final String email = "email"; 
public static final String senha = "senha"; 
public static final String nomeusu = "nomeusu"; 
public static final boolean isLogin = Boolean.parseBoolean("islogin"); 

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

    loginEmail = (EditText) findViewById(R.id.loginEmail); 
    loginSenha = (EditText) findViewById(R.id.loginSenha); 
    btLogar = (Button) findViewById(R.id.btLogar); 
    refCadastrar = (TextView) findViewById(R.id.refCadastrar); 
    checkBox = (CheckBox) findViewById(R.id.checarSessao); 

    SharedPreferences sharedPref; 
    sharedPref = getSharedPreferences("info_usuario", Context.MODE_PRIVATE); 
    boolean login = sharedPref.getBoolean(String.valueOf(isLogin), false); 

    if(login){ 
     Intent abreHome = new Intent(Login.this, Home.class); 
     startActivity(abreHome); 
    } 


    refCadastrar.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent abreCadastro = new Intent(Login.this, Cadastro.class); 
      startActivity(abreCadastro); 
     } 
    }); 

    btLogar.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      ConnectivityManager connectivityManager = (ConnectivityManager) 
        getSystemService(Context.CONNECTIVITY_SERVICE); 
      NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); 

      if (networkInfo != null && networkInfo.isConnected()) { 

       String email = loginEmail.getText().toString(); 
       String senha = loginSenha.getText().toString(); 

       if (email.isEmpty() && senha.matches(".*[a-z].*")) { 
        loginEmail.setError("Insira seu endereço de Email."); 
       } else if (email.matches(".*[a-z].*") && senha.isEmpty()) { 
        loginSenha.setError("Insira sua Senha."); 
       } else if (email.isEmpty() && senha.isEmpty()) { 
        Toast.makeText(getApplicationContext(), "Nenhum campo pode ficar vazio.", Toast.LENGTH_LONG).show(); 
       } else { 

        // Casa 
        url = "http://192.168.1.103/lyne/logar.php"; 

        // Badran 
        // url = "http://172.16.2.15/lyne/logar.php"; 

        parametro = "email=" + email + "&senha=" + senha; 

        new SolicitaDados().execute(url); 

       } 

      } else { 
       Toast.makeText(getApplicationContext(), "Nenhuma conexão com a Internet foi encontrada.", Toast.LENGTH_LONG).show(); 
      } 


     } 
    }); 
} 

private class SolicitaDados extends AsyncTask<String, Void, String> { 
    @Override 
    protected String doInBackground(String... urls) { 

     return Conexao.postDados(urls[0], parametro); 

    } 

    @Override 
    protected void onPostExecute(String resultado) { 

     if (resultado != null) { 
      if (resultado.contains("login_ok")) { 

       String[] dados = resultado.split(","); 

       Intent abreHome = new Intent(Login.this, Home.class); 

       abreHome.putExtra("idusu", dados[0]); 
       abreHome.putExtra("nomeusu", dados[1]); 
       abreHome.putExtra("sobreusu", dados[2]); 
       abreHome.putExtra("emailusu", dados[3]); 
       abreHome.putExtra("senhausu", dados[4]); 

       if (checkBox.isChecked()) { 

        SharedPreferences sharedPref = getSharedPreferences("info_usuario", Context.MODE_PRIVATE); 
        SharedPreferences.Editor editor = sharedPref.edit(); 
        editor.putString(email, loginEmail.getText().toString()); 
        editor.putString(senha, loginSenha.getText().toString()); 
        editor.putString(nomeusu, "Higor"); 
        editor.putBoolean(String.valueOf(isLogin), true); 
        editor.commit(); 
        editor.apply(); 
        Toast.makeText(getApplicationContext(), "Esta marcado.", Toast.LENGTH_LONG).show(); 
        startActivity(abreHome); 
        finish(); 

       } 

       overridePendingTransition(android.R.anim.fade_out, android.R.anim.fade_in); 

       startActivity(abreHome); 
       finish(); 
      } else { 
       Toast.makeText(getApplicationContext(), "Usuário ou senha incorretos.", Toast.LENGTH_LONG).show(); 
      } 
     } 
    } 

} 

public class Global extends Application { 

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

     SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); 
     String recentSearches = sharedPreferences.getString("email", ""); 

     if (recentSearches.isEmpty()) { 
      Intent intent = new Intent(getApplicationContext(), Home.class); 
      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
      startActivity(intent); 
     } 
    } 

} 
}

[Android的共享偏好的例子]可能的复制（ https://*.com/questions/23024831/android-shared-preferences-example） –

检查这个答案它可以帮助你https://*.com/questions/45168556/in-android-how-doi-i-来自php-login-script-save-response-coming-share-prefer/45168962＃45168962 –

答

使用下面的代码;

用于存储值;

SharedPreferences sp=getSharedPreferences("Login", Context.MODE_PRIVATE); 
SharedPreferences.Editor Ed=sp.edit(); 
Ed.putString("id",login_id.getText().toString()); 
Ed.putString("password",login_password.getText().toString()); 
Ed.commit();

获取值;

SharedPreferences sharedPreferences = getSharedPreferences("Login", MODE_PRIVATE); 
    String uName = sharedPreferences.getString("id", ""); 
    String password = sharedPreferences.getString("password", "");

答

以下代码正在为我工作。尝试这个。

偏好

SharedPreferences preferences = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE); 
SharedPreferences.Editor editor = preferences.edit(); 
editor.putString("email",Email); 
editor.putString("password",Password); 
editor.commit(); 
editor.apply();

存储值从喜好

SharedPreferences preferences = getSharedPreferences("MyPrefs", MODE_PRIVATE); 
String email = preferences.getString("email", ""); 
String pass = preferences.getString("password", "");

试过了，但没有成功，已经修好了谢谢 – Higor

答

如果你要检查它获得价值，只为每个应用程序启动第一次是更好地使通用类。可以是这样做的：（每个应用程序启动一次，这个类运行）

public class Global extends Application { 

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

    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); 
    String email = sharedPreferences.getString("email", ""); 

    if(email.isEmpty()){ 
     Intent intent = new Intent(getApplicationContext(), YOUR_ACTIVITY.class); 
     intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
     startActivity(intent); 
    } 
}

然后你应该注册清单中的类：

<application 
    android:name=".Global" 

    android:label="@string/app_name"> 
    <activity android:name="MyActivity" 
    </activity> 
</application>

我试过这种方式，但在这里工作，我已经解决了这个问题！感谢你们对我的帮助。 – Higor

如果您解决了问题，请将其添加为答案，也许它可以帮助另一个人。 –

如何使用SharedPreferences来存储用户的电子邮件和密码

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