SharedPreferences値

Question

1. Registration_Form.java

を移すませんこれは私の登録フォームであると私は私を助け、私は間違ってコーディングをやっているところを教えてくださいSharedPreferencesてからログインしてから、登録からユーザ名を移動したいです。あなたのトーストで

package com.example.android.demo; 

import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.support.annotation.IdRes; 
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.CompoundButton; 
import android.widget.EditText; 
import android.widget.RadioButton; 
import android.widget.RadioGroup; 
import android.widget.Toast; 

import static android.icu.lang.UCharacter.GraphemeClusterBreak.T; 

public class Registration_Form extends AppCompatActivity { 
    EditText e1, m1, p1, p2, em; 
    Button b1; 
    CheckBox ch; 
    RadioButton r1, r2; 
    RadioGroup ra; 
    SharedPreferences sharedPreferences; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_registration__form); 
     e1 = (EditText) findViewById(R.id.username); 
     m1 = (EditText) findViewById(R.id.phone); 
     p1 = (EditText) findViewById(R.id.password); 
     p2 = (EditText) findViewById(R.id.conpassword); 
     em = (EditText) findViewById(R.id.email); 
     b1 = (Button) findViewById(R.id.submit); 
     ch = (CheckBox) findViewById(R.id.checkedTextView); 
     r1 = (RadioButton) findViewById(R.id.male); 
     r2 = (RadioButton) findViewById(R.id.female); 
     ra = (RadioGroup) findViewById(R.id.radioGroup); 

     //sharedPreferences Configuration 
     sharedPreferences = getSharedPreferences("Demo", Context.MODE_PRIVATE); 

     b1.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       if (e1.getText().toString().isEmpty() || e1.getText().toString().length() < 6) { 
        e1.setError("Please Enter At Least 6 Character"); 
       } else { 
        if (m1.getText().toString().isEmpty() || m1.getText().toString().length() < 10) { 
         m1.setError("Please Enter Correct Mobile Number"); 
        } else { 
         if (m1.getText().toString().startsWith("9") || m1.getText().toString().startsWith("8") || m1.getText().toString().startsWith("7")) { 
         } else { 
          Toast.makeText(getApplicationContext(), "Mobile Number Start With 9/8/7 ", Toast.LENGTH_SHORT).show(); 
         } 
         if (p1.getText().toString().isEmpty() || p1.getText().toString().length() < 6 || p2.getText().toString().isEmpty() || p2.getText().toString().length() < 6) { 
          Toast.makeText(getApplicationContext(), "Please Enter At Lease 6 Character", Toast.LENGTH_SHORT).show(); 
         } else { 
          if (!p1.getText().toString().equals(p2.getText().toString())) { 
           Toast.makeText(getApplicationContext(), "Password Not Matched", Toast.LENGTH_SHORT).show(); 
          } else { 
           if (em.getText().toString().isEmpty()) { 
            em.setError("Please Enter Valid Email"); 
           } else { 
            if (r1.isChecked() == true || r2.isChecked() == true) { 
             if (ch.isChecked() == true) { 
              Toast.makeText(getApplicationContext(), "Register Successfully", Toast.LENGTH_SHORT).show(); 
              SharedPreferences.Editor editor = sharedPreferences.edit(); 
               editor.putString("userName", e1.getText().toString()); 
               editor.commit(); 
               Intent login = new Intent(getApplicationContext(),Login.class); 
               startActivity(login); 
               finish(); 
             } else { 
              Toast.makeText(getApplicationContext(), "Please Select The Check Box To Further Proceed", Toast.LENGTH_SHORT).show(); 
             } 
            } else { 
             Toast.makeText(getApplicationContext(), "Please Select One Gender", Toast.LENGTH_SHORT).show(); 
            } 
           } 

          } 
         } 
        } 
       } 
      } 
     }); 
    } 
} 

2.Login.java

package com.example.android.demo; 

import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 
import android.widget.Toast; 

public class Login extends AppCompatActivity { 

    EditText e1,e2; 
    Button b1; 
    TextView t1; 
    SharedPreferences loginShare; 
    String myLogin; 

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

     e1 = (EditText)findViewById(R.id.username); 
     e2 = (EditText)findViewById(R.id.password); 
     b1 = (Button) findViewById(R.id.login); 
     t1 = (TextView)findViewById(R.id.registrationYourSelf); 

     loginShare = getSharedPreferences("Demo", Context.MODE_PRIVATE); 
     myLogin = loginShare.getString("userName", null); 
     Toast.makeText(getApplicationContext(),myLogin,Toast.LENGTH_LONG); 

     b1.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       if(e1.getText().toString().equals("admin") && e2.getText().toString().equals("admin")){ 
        Toast.makeText(getApplicationContext(), "Login Successfully", Toast.LENGTH_SHORT).show(); 

        Intent mainpage = new Intent(getApplicationContext(),MainActivity.class); 
        startActivity(mainpage); 
        finish(); 
       }else { 
        Toast.makeText(getApplicationContext(),"Credentials Not Match",Toast.LENGTH_SHORT).show(); 
       } 
      } 
     }); 


     t1.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent registrationForm = new Intent(getApplicationContext(),Registration_Form.class); 
       startActivity(registrationForm); 
       //finish(); 
      } 
     }); 
    } 

} 

Answer 1

あなたは最後に.show()を追加されていません。

Toast.makeText(getApplicationContext(),myLogin,Toast.LENGTH_LONG).show(); 

Answer 2

あなたは非常にばかげた間違いをしました。 .showを追加してtoastを表示していません。

これを試してください：あなたの `Login`活動の

............ 
    .................... 
    loginShare = getSharedPreferences("Demo", Context.MODE_PRIVATE); 
    myLogin = loginShare.getString("userName", null); 
    Toast.makeText(getApplicationContext(), "Value: " + myLogin,Toast.LENGTH_LONG).show();