因此，我进行了一些研究，并在代码中将按钮定义为对象之后

private Button buttonname;

buttonname = (Button) findViewById(R.id.buttonnameinandroid) ;

这是我的问题

buttonname.setOnClickListener(this); //as I understand it, the "**this**" denotes the current `view(focus)` in the android program

那你的OnClick()活动…

问题：

当我输入“ this”时，它说：

setOnClickListener (Android.View.view.OnClickListener) in View cannot be applied to (com.helloandroidstudio.MainActivity)

我不知道为什么？

这是.java文件中的代码

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

private Button btnClick;

private EditText Name, Date;

private TextView msg, NameOut, DateOut;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

btnClick = (Button) findViewById(R.id.button) ;

btnClick.setOnClickListener(this);

Name = (EditText) findViewById(R.id.textenter) ;

Date = (EditText) findViewById(R.id.editText) ;

msg = (TextView) findViewById(R.id.txtviewOut) ;

NameOut = (TextView) findViewById(R.id.txtoutName) ;

DateOut = (TextView) findViewById(R.id.txtOutDate) ;

if (savedInstanceState == null) {

getSupportFragmentManager().beginTransaction()

.add(R.id.container, new PlaceholderFragment())

.commit();

}

}

public void onClick(View v)

{

if (v == btnClick)

{

if (Name.equals("") == false && Date.equals("") == false)

{

NameOut = Name;

DateOut = Date;

msg.setVisibility(View.VISIBLE);

}

else

{

msg.setText("Please complete both fields");

msg.setVisibility(View.VISIBLE);

}

}

return;

}