Android開發

Question

應用程序意外停止

按下指定頁面上的按鈕時出現此錯誤。

此代碼可掛起應用程序：-代碼段

    <Button android:text="Button" 
    android:onClick="SaveRegistration" 
    android:id="@+id/btnAddRegistration" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content">
    </Button>       

public void SaveRegistration(View view) {
        Toast.makeText(getApplicationContext(), "OK", Toast.LENGTH_LONG).show();
    }

我在2.2版上運行

Logcat錯誤日志

06-26 14:25:52.613: ERROR/AndroidRuntime(447): FATAL EXCEPTION: main
06-26 14:25:52.613: ERROR/AndroidRuntime(447): java.lang.IllegalStateException: Could not find a method add(View) in the activity class com.millerbean.gasApp.MillerbeansGasInfoActivity for onClick handler on view class android.widget.Button with id 'btnTest'
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at android.view.View$1.onClick(View.java:2131)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at android.view.View.performClick(View.java:2485)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at android.view.View$PerformClick.run(View.java:9080)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at android.os.Handler.handleCallback(Handler.java:587)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at android.os.Looper.loop(Looper.java:123)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at android.app.ActivityThread.main(ActivityThread.java:3683)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at java.lang.reflect.Method.invokeNative(Native Method)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at java.lang.reflect.Method.invoke(Method.java:507)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at dalvik.system.NativeStart.main(Native Method)
06-26 14:25:52.613: ERROR/AndroidRuntime(447): Caused by: java.lang.NoSuchMethodException: add
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at java.lang.ClassCache.findMethodByName(ClassCache.java:247)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at java.lang.Class.getMethod(Class.java:962)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     at android.view.View$1.onClick(View.java:2124)
06-26 14:25:52.613: ERROR/AndroidRuntime(447):     ... 11 more
06-26 14:25:52.643: WARN/ActivityManager(75):   Force finishing activity com.millerbean.gasApp/.MillerbeansGasInfoActivity
06-26 14:25:53.193: WARN/ActivityManager(75): Activity pause timeout for HistoryRecord{4050f5b0 com.millerbean.gasApp/.MillerbeansGasInfoActivity}

問題解決了！

在我的主要Java文件中，我的第一個按鈕上包含以下內容：setContentView（R.layout.newregistration）; 它將布局更改為另一個xml文件newregistration.xml

稍后，我創建了一個Addregistration.java文件，在其中放置了事件處理程序。 需要將事件處理程序放置在我的主Java文件中，現在它可以工作了。

之間有什么區別：1. setContentView（R.layout.newregistration）; 2. startActivity（new Intent（this，MenuBuilder.class））;

1.設置用戶看到的布局是否正確2.設置要獲取事件處理程序的類等，是否正確？

Answer 1

您的班級是否像下面那樣擴展Activity ？

從Android網站：

public class HelloAndroid extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       TextView tv = new TextView(this);
       tv.setText("Hello, Android");
       setContentView(tv);
   }
}

編輯：注釋掉Toast會導致錯誤消失嗎？ 如果是這樣，這可能是問題所在。 在Android教程中進行工作 。

Answer 2

如果刪除該怎么辦

android:onClick="SaveRegistration"

從您的布局並在您的代碼中進行操作，例如

Button myButton = this.findViewById(btnAddRegistration);
myButton.setOnClickListener(new OnClickListener()
        {
            public void onClick(View v) 
            {
                SaveRegistration(v);
            }
        }
    );