以下是我使用的Java文件。所有代码都运行良好，但上面的错误仍然存在。有谁能看到这个问题？
package tip.calculator;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class TipCalculator extends Activity
{
private Button enter;
EditText myEditField;
EditText myEditField2;
float percentage = 0;
float percentageInp = 0;
float billAmount = 0;
double output = 0;
String output1 = "";
Button clearButton ;
TextView textView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myEditField = (EditText) findViewById(R.id.percentText);
enter = (Button)findViewById(R.id.button1);
myEditField2 = (EditText) findViewById(R.id.billText);
clearButton = (Button) findViewById(R.id.clearButton);
enter.setOnClickListener( new OnClickListener() {
public void onClick(View v) {
TextView errors;
textView = (TextView) findViewById(R.id.textView1);
errors = (TextView) findViewById(R.id.textView4);
int a = 0;
if(myEditField2.getText().toString().equals("")) {
errors.setText("Error");
} else {
a++;
}
if(myEditField.getText().toString().equals("")){
errors.setText("Error");
} else {
a++;
}
if(a == 2) {
percentageInp = Float.parseFloat(myEditField.getText().toString());
billAmount = Float.parseFloat(myEditField2.getText().toString());
percentage = ((float)percentageInp /100);
output = (double)(billAmount * percentage);
double result = output * 100;
result = Math.round(result);
result = result / 100;
output1 = Double.toString(result);
View.setText(output1 + " $");
errors.setText("");
}
}
});
clearButton.setOnClickListener( new OnClickListener() {
public void onClick(View v) {
TextView errors;
textView = (TextView) findViewById(R.id.textView1);
errors = (TextView) findViewById(R.id.textView4);
int a = 0;
if (myEditField2.getText().toString().equals("")) {
myEditField.setText("");
percentage = 0;
percentageInp = 0;
billAmount = 0;
output = 0;
textView.setText("");
output1 = "";
} else {
a++;
}
if(myEditField.getText().toString().equals("")) {
myEditField2.setText("");
percentage = 0;
percentageInp = 0;
billAmount = 0;
output = 0;
output1 = "";
textView.setText("");
} else {
a++;
}
if (a == 2) {
myEditField.setText("");
myEditField2.setText("");
percentage = 0;
percentageInp = 0;
billAmount = 0;
output = 0;
output1 = "";
textView.setText("");
errors.setText("");
}
}
});
}
}
这是logcat，我得到一个我完全不明白的错误。我从不称呼方法 onEnterClick() ？
08-02 21:17:37.205: E/AndroidRuntime(27185): FATAL EXCEPTION: main
08-02 21:17:37.205: E/AndroidRuntime(27185): java.lang.IllegalStateException: Could not find a method onEnterClick(View) in the activity class tip.calculator.TipCalculator for onClick handler on view class android.widget.RelativeLayout with id 'errorText'
08-02 21:17:37.205: E/AndroidRuntime(27185): at android.view.View$1.onClick(View.java:3085)
08-02 21:17:37.205: E/AndroidRuntime(27185): at android.view.View.performClick(View.java:3620)
08-02 21:17:37.205: E/AndroidRuntime(27185): at android.view.View$PerformClick.run(View.java:14292)
08-02 21:17:37.205: E/AndroidRuntime(27185): at android.os.Handler.handleCallback(Handler.java:605)
08-02 21:17:37.205: E/AndroidRuntime(27185): at android.os.Handler.dispatchMessage(Handler.java:92)
08-02 21:17:37.205: E/AndroidRuntime(27185): at android.os.Looper.loop(Looper.java:137)
08-02 21:17:37.205: E/AndroidRuntime(27185): at android.app.ActivityThread.main(ActivityThread.java:4507)
08-02 21:17:37.205: E/AndroidRuntime(27185): at java.lang.reflect.Method.invokeNative(Native Method)
08-02 21:17:37.205: E/AndroidRuntime(27185): at java.lang.reflect.Method.invoke(Method.java:511)
08-02 21:17:37.205: E/AndroidRuntime(27185): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
08-02 21:17:37.205: E/AndroidRuntime(27185): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
08-02 21:17:37.205: E/AndroidRuntime(27185): at dalvik.system.NativeStart.main(Native Method)
08-02 21:17:37.205: E/AndroidRuntime(27185): Caused by: java.lang.NoSuchMethodException: onEnterClick [class android.view.View]
08-02 21:17:37.205: E/AndroidRuntime(27185): at java.lang.Class.getConstructorOrMethod(Class.java:460)
08-02 21:17:37.205: E/AndroidRuntime(27185): at java.lang.Class.getMethod(Class.java:915)
08-02 21:17:37.205: E/AndroidRuntime(27185): at android.view.View$1.onClick(View.java:3078)
08-02 21:17:37.205: E/AndroidRuntime(27185): ... 11 more
答案 0 :(得分：3)
我认为你已经在XML Layout中定义了onclick方法。你已经在程序中编写了onclick监听器。从xml布局中删除以下行，您的程序运行正常：
android:onclick="onEnterClick"
答案 1 :(得分：1)
这是因为您将android:onClick="onEnterClick"设置为RelativeLayout而且，您未在TipCalculator.java文件中实现此功能。那么，IllegalStateException你有LogCat的第一行 -
在活动类tip.calculator.TipCalculator中找不到onEnterClick（View）方法，用于视图类android.widget.RelativeLayout上的onClick处理程序，其id为'errorText'
您可以通过以上异常线轻松理解。
答案 2 :(得分：0)
也许是因为你已经在xml的Button布局中声明了一个函数onEnterClick。按钮布局中会有android:onClick="onEnterClick这样的行。
因此，在
中按下该按钮时，请定义所需的操作public void onEnterClick(View view)
。
注意：首先必须创建此功能。