setText() 错误，TextView 方法无法解析

Question

方法无法解析此代码中的 TextView 这有什么问题？public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    EditText Username = (EditText) findViewById(R.id.EmployerNameEdit);    String userName = Username.getText().toString();    TextView changedName = (TextView) findViewById(R.id.employerName);    changedName.setText(userName);}

Answer 1

可能是你错过了大括号，

公共类 MainActivity 扩展 AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    EditText Username = (EditText) findViewById(R.id.EmployerNameEdit);

    String userName = Username.getText().toString();

    TextView changedName = (TextView) findViewById(R.id.employerName);

    changedName.setText(userName);

}

}

如果您仍然遇到问题，请随时提出问题。:)

Answer 2

oncreate 或 create global edittext 和 TextView 中的每件事

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

 EditText Username = (EditText) findViewById(R.id.EmployerNameEdit);

String userName = Username.getText().toString();

TextView changedName = (TextView) findViewById(R.id.employerName);

changedName.setText(userName);

 }