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 （对于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 （适用于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);
    }

}

此代码生成以下UI。请注意，您看到的“菜单”是由drop_down.xml构建的。

enter image description here

问题是，当我点击 drop_down.xml 中的TextView menu_add_inquiry 时，我收到以下错误。

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

它说方法丢失了，但它就在那里。

更新

我使用完整定义com.example.fragmenttest.DropDownMenu.onMenuItemClicked编辑了 drop_down.xml 中的按钮。现在我有以下问题

11-28 14：49：45.757：E / AndroidRuntime（2604）：引起：java.lang.NoSuchMethodException：com.example.fragmenttest.DropDownMenu.onMenuItemClicked [class android.view.View]

Answer 1

在drop_down.xml布局中，调用MainActivity类中不存在的onMenuItemClicked方法。

对于布局，它是将被调用的活动的方法（而不是片段之一）。

您可能希望使用相同的方法替换您的方法，但是在MainActivity类中。

您可以阅读Android android:onclick的文档：

此名称必须对应于只接受View类型的一个参数的公共方法。例如，如果指定android：onClick =“sayHello”，则必须声明上下文的公共void sayHello（View v）方法（通常是您的活动）。

'NoSuchMethodException'，即使该方法确实存在

1 个答案: