问题

**货币转换器的 Java 代码（从英镑到美元）：**

package com.example.currencyconverter;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
    
public class MainActivity extends AppCompatActivity {
    public void convert(View view){
      Log.i("info", "按钮已点击！");
      EditText editText = findViewById(R.id.editText);
      String amtInPounds = editText.getText().toString();
      double amtInPoundsDouble = Double.parseDouble(amtInPounds);
      double amtInDollarDouble = amtInPoundsDouble * 1.3;
      String amtInDollarString = Double.toString(amtInDollarDouble);
      Log.i("info", amtInDollarString);
         
    }

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

    }
}

logcat 错误信息：

E/AndroidRuntime: 致命异常：主线程 进程：com.example.currencyconverter，PID：7262

<details>
<summary>英文:</summary>

**The java code for a currency convertor(pounds to dollars):**

    package com.example.currencyconverter;
    import androidx.appcompat.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;
    import android.widget.EditText;
        
    public class MainActivity extends AppCompatActivity {
        public void convert(View view){
          Log.i(&quot;info&quot;, &quot;button works!&quot;);
          EditText editText = findViewById(R.id.editText);
          String amtInPounds = editText.getText().toString();
          double amtInPoundsDouble = Double.parseDouble(amtInPounds);
          double amtInDollarDouble = amtInPoundsDouble * 1.3;
          String amtInDollarString = Double.toString(amtInDollarDouble);
             Log.i(&quot;info&quot;, amtInDollarString);
             
         }
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
        }
    }

**logcat Error:**

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.currencyconverter, PID: 7262
   

</details>