Question

此代码中的方法无法解析TextView
怎么了？

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

oncreate或创建全局edittext和TextView中的所有内容

@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 2

据我所知，您想在Textview中设置Edittext的文本。为此必须使用任何按钮单击。否则，必须使用textChangeListener（）方法。

按钮点击代码如下：

public class MainActivity extends AppCompatActivity {

EditText et;
TextView tv;
Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et=findViewById(R.id.et);
        tv=findViewById(R.id.tv);
        btn=findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String text=et.getText().toString();
                tv.setText(text);
            }
        });
    }
}

Answer 3

也许您错过了花括号，

公共类MainActivity扩展了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);
}

}

如果仍然遇到问题，请随意提问。：）

setText（）错误，方法无法为TextView解析

3 个答案: