ログインアクティビティが次の画面に表示されない

Question

ログインボタンを押すと、正しいユーザー名&パスワードを入力しても（ユーザー名/パスワードが間違っている）が表示されます。それは次の活動には行かない。サインアップ活動はうまくいきます。

MainActivity

public class MainActivity extends AppCompatActivity { 
private Button signup; 
DatabaseHelper helper = new DatabaseHelper(this); 

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

    signup = (Button) findViewById(R.id.Bsignup); 

    signup.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent button = new Intent(MainActivity.this, SignUp.class); 
      MainActivity.this.startActivity(button); 
     } 
    }); 
} 

public void onButtonClick(View v) { 
    if (v.getId() == R.id.BLogin) { 

     EditText a = (EditText) findViewById(R.id.TFusername); 
     String str = a.getText().toString(); 
     EditText b = (EditText) findViewById(R.id.TFpassword); 
     String pass = b.getText().toString(); 

     String password = helper.searchPass(str); 
     if (password.equals(pass)) { 

      Intent i = new Intent(MainActivity.this, Display.class); 
      i.putExtra("Username", str); 
      startActivity(i); 

     }else{ 

      Toast temp = Toast.makeText(MainActivity.this, "Username/Password Wrong", Toast.LENGTH_LONG); 
      temp.show(); 

     } 
    } 
}} 

SignupActivity

public class SignUp extends AppCompatActivity { 

DatabaseHelper helper = new DatabaseHelper(this); 

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

public void onSignUpClick(View v){ 
    if(v.getId()== R.id.Bsignupbutton){ 
     EditText name = (EditText) findViewById(R.id.TFname); 
     EditText uname = (EditText) findViewById(R.id.TFuname); 
     EditText phone = (EditText) findViewById(R.id.TFphone); 
     EditText pass1 = (EditText) findViewById(R.id.TFpass1); 
     EditText pass2 = (EditText) findViewById(R.id.TFpass2); 

     String namestr = name.getText().toString(); 
     String unamestr = uname.getText().toString(); 
     String phonestr = phone.getText().toString(); 
     String pass1str = pass1.getText().toString(); 
     String pass2str = pass2.getText().toString(); 

     if (!pass1str.equals(pass2str)){ 
      Toast pass = Toast.makeText(SignUp.this, "Password doesn't match", Toast.LENGTH_LONG); 
      pass.show(); 
     }else{ 

      Contact c = new Contact(); 
      c.setName(namestr); 
      c.setUname(unamestr); 
      c.setPhone(phonestr); 
      c.setPass(pass1str); 

      helper.insertContact(c); 

      Toast.makeText(getApplicationContext(), "Registration Successful", Toast.LENGTH_LONG).show(); 
      startActivity(new Intent(this, MainActivity.class)); 
     } 
    } 
}} 

DatabaseHelper

public class DatabaseHelper extends SQLiteOpenHelper { 

private static final int DATABASE_VERSION = 1; 
private static final String DATABASE_NAME = "contacts.db"; 
private static final String TABLE_NAME = "contacts"; 
private static final String COLUMN_ID = "id"; 
private static final String COLUMN_NAME = "name"; 
private static final String COLUMN_UNAME = "uname"; 
private static final String COLUMN_PHONE = "phone"; 
private static final String COLUMN_PASS = "pass"; 
SQLiteDatabase db; 


public DatabaseHelper(Context context) 
{ 
    super(context, DATABASE_NAME, null, DATABASE_VERSION); 
} 
private static final String TABLE_CREATE = "create table contacts (id integer primary key not null , " + 
     "name text not null , uname text not null , phone text not null, pass text not null);"; 
@Override 
public void onCreate(SQLiteDatabase db) { 
    db.execSQL(TABLE_CREATE); 
    this.db = db; 
} 
public void insertContact(Contact c) { 
    db = this.getWritableDatabase(); 
    ContentValues values = new ContentValues(); 

    String query = "select * from contacts"; 
    Cursor cursor = db.rawQuery(query, null); 
    int count = cursor.getCount(); 

    values.put(COLUMN_ID, count); 
    values.put(COLUMN_NAME, c.getName()); 
    values.put(COLUMN_UNAME, c.getUname()); 
    values.put(COLUMN_PHONE, c.getPhone()); 
    values.put(COLUMN_PASS, c.getPass()); 

    db.insert(TABLE_NAME , null , values); 

} 

public String searchPass(String uname) 
{ 
    db= this.getReadableDatabase(); 
    String query = "select uname, pass from "+TABLE_NAME; 
    Cursor cursor = db.rawQuery(query, null); 
    String a, b; 
    b = "not found"; 
    if (cursor.moveToFirst()) 
    { 
     do{ 
      a = cursor.getString(0); 

      if (a.equals(uname)) 
      { 

       b = cursor.getString(1); 
       break; 
      } 
     } 
     while(cursor.moveToNext()); 
    } 
    return b; 
} 
@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    String query = "DROP TABLE IF EXISTS " + TABLE_NAME; 
    db.execSQL(query); 
    this.onCreate(db); 
}} 

Answer 1

私はこの問題は、メソッドpublic void onButtonClick(View v) { }それを確認しようの呼び出しであると思います。それは働いているかどうか？