Android：我如何从一个类的方法访问值？

Question

看到，我有2类可以说登录类和欢迎类，在登录类我有全球变量String Email;和OnCreate()。我在该方法中为Email设置了值，现在我的问题是如何获取从方法初始化的那个变量的值？

public class LoginActivity extends AppCompatActivity { 
private EditText email,password; 

public String emailText; 

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

     email = (EditText) findViewById(R.id.email); 
     //I want to get this value 
     emailText = email.getText().toString(); 
} 
} 

，我的另一个类是

public class Welcome extends Activity{ 
protected void onCreate(Bundle savedInstanceState) { 
    TextView textView = (TextView) findViewById(R.id.email); 
    //this is what I did which is the variable that was unInitialized 
    LoginActivity loginActivity = new LoginActivity(); 
     textView.setText(loginActivity.getEmailText()); 
} 
} 

Answer 1

你必须开始与一些额外的欢迎活动：

Intent startWelcomeActivityIntent = new Intent(context, Welcome.class); 
    startWelcomeActivityIntent.putExtra("keyForUsername", userNameString); 
    startWelcomeActivityIntent.putExtra("keyForPassword", passwordString); 
    startActivity(startWelcomeActivityIntent); 

然后检索欢迎活动onCreate方法这个演员：

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

    Intent intentWithData = getIntent(); 
    String userNameFromLoginActivity = intentWithData.getStringExtra("keyForUsername"); 
    String passwordFromLoginActivity = intentWithData.getStringExtra("keyForPassword"); 
}