'NoSuchMethodException' 即使該方法確實存在

Question

fragment_view1.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/viewOneText" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" 
     android:layout_marginLeft="92dp" 
     android:layout_marginTop="182dp" 
     android:text="First View" 
     android:textAppearance="?android:attr/textAppearanceLarge" /> 

    <Button 
     android:id="@+id/viewOneBtn" 
     style="?android:attr/buttonStyleSmall" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignRight="@+id/viewOneText" 
     android:layout_below="@+id/viewOneText" 
     android:layout_marginTop="17dp" 
     android:text="Click Here" /> 

    <include layout = "@layout/drop_down" 
      android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="15dp" 
     android:layout_alignParentBottom="true"/> 
</RelativeLayout> 

drop_down.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 

    <SlidingDrawer 
     android:id="@+id/SlidingDrawer" 
     android:layout_width="wrap_content" 
     android:layout_height="250dp" 
     android:layout_alignParentBottom="true" 
     android:content="@+id/contentLayout" 
     android:handle="@+id/slideButton" 
     android:orientation="vertical" 

     android:alpha="0.7"> 

     <LinearLayout 
      android:id="@+id/slideButton" 
      android:layout_width="fill_parent" 
      android:layout_height="20dp" 
      android:orientation="vertical" 
      android:clickable="true" 
      android:gravity="right" 
      android:background="@android:drawable/bottom_bar" 
      > 

      <TextView 
       android:id="@+id/textView1" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="^^^" 
       android:textAppearance="?android:attr/textAppearanceMedium" /> 

     </LinearLayout> 

     <LinearLayout 
      android:id="@+id/contentLayout" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:orientation="vertical" 
      android:background="#000000" 
      android:padding="10dip" > 

      <TextView 
       android:id="@+id/menu_add_inquiry" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:padding="5dp" 
       android:text="AAA" 
       android:textColor="#ffffff" 
       android:clickable="true" 
       android:onClick="onMenuItemClicked" 
       android:textAppearance="?android:attr/textAppearanceMedium" /> 

      <TextView 
       android:id="@+id/menu_add_event" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:padding="5dp" 
       android:text="BBB" 
       android:textColor="#ffffff" 
       android:textAppearance="?android:attr/textAppearanceMedium" /> 

      <TextView 
       android:id="@+id/menu_additional_info" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:padding="5dp" 
       android:text="CCC" 
       android:textColor="#ffffff" 
       android:textAppearance="?android:attr/textAppearanceMedium" /> 

      <TextView 
       android:id="@+id/menu_add_to_contacts" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:padding="5dp" 
       android:text="DDD" 
       android:textColor="#ffffff" 
       android:textAppearance="?android:attr/textAppearanceMedium" /> 



     </LinearLayout> 
    </SlidingDrawer> 

</RelativeLayout> 

FirstView.java（用於fragment_view1.xml）

package com.example.fragmenttest; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.TextView; 

public class FirstView extends DropDownMenu 
{ 
    private TextView firstText; 
    private Button btn; 

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    { 


     View view = inflater.inflate(R.layout.fragment_view1,container,false); 


     firstText = (TextView)view.findViewById(R.id.viewOneText); 
     btn = (Button)view.findViewById(R.id.viewOneBtn); 

     return view; 

    } 



} 

DropDownMenu.java（對於drop_down.xml）

package com.example.fragmenttest; 



import android.os.Bundle; 
import android.app.Activity; 
import android.content.Intent; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.View.OnClickListener; 
import android.view.View.OnTouchListener; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 
import android.widget.TextView; 
import android.widget.Toast; 

public class DropDownMenu extends Fragment { 

    private TextView addInquiry, addEvent, additionalInfo, addToContacts; 
    private View view; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    { 
     view = inflater.inflate(R.layout.drop_down,container,false); 
     intialize(); 
     return view; 

    } 

    private void intialize() 
    { 

     //Intializing instance variables 
     addInquiry = (TextView)view.findViewById(R.id.menu_add_inquiry); 
     addEvent = (TextView)view.findViewById(R.id.menu_add_event); 
     additionalInfo = (TextView)view.findViewById(R.id.menu_additional_info); 
     addToContacts = (TextView)view.findViewById(R.id.menu_add_to_contacts); 

    } 



    public void onMenuItemClicked(View view) { 
     switch (view.getId()) { 
     case R.id.menu_add_inquiry: 
      // Intent intent = new Intent(DropDownMenu.this,NewLead.class); 
      // startActivity(intent); 
      break; 
     default:; 
     } 
    } 

} 

MainActivity.java

package com.example.fragmenttest; 

import android.os.Bundle; 
import android.app.Activity; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import android.support.v4.view.PagerAdapter; 
import android.support.v4.view.ViewPager; 
import android.view.Menu; 

public class MainActivity extends FragmentActivity { 

    private ViewPager viewPager; 
    private MyAdapter pageAdapter; 
    private static final int ITEMS = 2; 

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

     viewPager = (ViewPager)findViewById(R.id.pager); 
     pageAdapter = new MyAdapter(getSupportFragmentManager()); 
     viewPager.setAdapter(pageAdapter); 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    public static class MyAdapter extends FragmentPagerAdapter { 


     public MyAdapter(FragmentManager fragmentManager) { 
      super(fragmentManager); 
     } 

     @Override 
     public int getCount() { 
      return ITEMS; 
     } 

     @Override 
     public Fragment getItem(int position) { 
      if(position==0) 
      { 
       return new FirstView(); 
      } 
      else 
      { 
       return new SecondView(); 
      } 
     } 
    } 

    public void setCurrentItem (int item, boolean smoothScroll) { 
     viewPager.setCurrentItem(item, smoothScroll); 
    } 

} 

此代碼生成以下UI。請注意，您看到的「菜單」由drop_down.xml構建。

的問題是，當我點擊drop_down.xml的TextViewmenu_add_inquiry，我碰到下面的錯誤。

11-28 14:13:52.537: E/AndroidRuntime(1933): FATAL EXCEPTION: main 
11-28 14:13:52.537: E/AndroidRuntime(1933): java.lang.IllegalStateException: Could not find a method onMenuItemClicked(View) in the activity class com.example.fragmenttest.MainActivity for onClick handler on view class android.widget.TextView with id 'menu_add_inquiry' 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at android.view.View$1.onClick(View.java:3586) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at android.view.View.performClick(View.java:4204) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at android.view.View$PerformClick.run(View.java:17355) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at android.os.Handler.handleCallback(Handler.java:725) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at android.os.Handler.dispatchMessage(Handler.java:92) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at android.os.Looper.loop(Looper.java:137) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at java.lang.reflect.Method.invoke(Method.java:511) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at dalvik.system.NativeStart.main(Native Method) 
11-28 14:13:52.537: E/AndroidRuntime(1933): Caused by: java.lang.NoSuchMethodException: onMenuItemClicked [class android.view.View] 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at java.lang.Class.getConstructorOrMethod(Class.java:460) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at java.lang.Class.getMethod(Class.java:915) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  at android.view.View$1.onClick(View.java:3579) 
11-28 14:13:52.537: E/AndroidRuntime(1933):  ... 11 more 

它說缺少方法，但它在那裏。

UPDATE

我編輯的按鈕drop_down.xml與完整定義com.example.fragmenttest.DropDownMenu.onMenuItemClicked。現在，我有以下問題

11-28 14：49：45.757：E/AndroidRuntime（2604）：java.lang.NoSuchMethodException：致com.example.fragmenttest.DropDownMenu.onMenuItemClicked [類機器人。 view.View]

Answer 1

在您的drop_down.xml佈局中，您調用onMenuItemClicked方法，該方法在MainActivity類中不存在。

在佈局的情況下，它將被調用的活動方法（而不是片段之一）。

你可能想用同樣的方法替換你的方法，但是在你的MainActivity類中。

你可以閱讀的Android android:onclick的文檔：

此名稱必須對應於需要的類型正好查看一個參數的公共方法。例如，如果您指定android：onClick =「sayHello」，則必須聲明您的上下文（通常爲您的活動）的公共無效sayHello（View v）方法。