问无法创建编辑文本对象

EN

import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;

import static com.example.myapplication.R.id.Client_Name; 

public class MainActivity extends AppCompatActivity {

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

   EditText t =(EditText)findViewById(Client_Name);//The problmatic line

<EditText 
         android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:hint="Name" 
         android:layout_margin="16dp" 
         android:id="@+id/Client_Name" 
         android:inputType="text"/>