Question

在android studio中我想尝试一个简单的数学检查器。用户将在EditText中输入答案，我在点击按钮时尝试检查此答案。

为方便起见，如果问题是3 + 3，则用户在EditText中输入6，当他们点击按钮时，会出现一个Toast，说明他们是对还是错。

我已经搜索了几个小时的代码，但我是Android Studio的新手，所以不确定我是否正确选择了它。

有人可以帮忙吗？

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class numbers1 extends AppCompatActivity {
EditText userAnswer;
String strInput = "";
Button answer;
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_numbers1);

    answer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            String check = userAnswer.getText().toString();

            if(check.equalsIgnoreCase("6"))
            {
                strInput = strInput+","+check;
                Toast.makeText(getApplicationContext(), "Correct", Toast.LENGTH_LONG).show();
                userAnswer.setText(strInput);
                userAnswer.setText("");
            }
            else {
                Toast.makeText(getApplicationContext(), "Not Quite. Try Again.", Toast.LENGTH_LONG).show();
        }
    });

}

}

Answer 1

我认为您的代码中缺少以下代码......

userAnswer = (EditText) findViewById(R.id.<edittext_id>);
answer =  (Button) findViewById(R.id.<button_id>);

Answer 2

在几个贡献者的帮助下，注意到我没有正确关闭括号，这里是正确的代码：

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class numbers1 extends AppCompatActivity {
EditText userAnswer;
String strInput = "";
Button answer;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_numbers1);

    Button answer = (Button) findViewById(R.id.answer);
    final EditText userAnswer = (EditText) findViewById(R.id.userAnswer);

    answer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            String check = userAnswer.getText().toString();

            if(check.equalsIgnoreCase("6"))
            {
                strInput = strInput+","+check;
                Toast.makeText(getApplicationContext(), "Correct", Toast.LENGTH_LONG).show();
                userAnswer.setText(strInput);
                userAnswer.setText("");
            }
            else {
                Toast.makeText(getApplicationContext(), "Not Quite. Try Again.", Toast.LENGTH_LONG).show();
        }
    }

});
}
}

Android：针对按钮检查EditText内容

2 个答案: