조각이 팽창 중 오류가 발생했습니다. 2

Question

조각의 학습 단계에 있습니다. 그렇다면 제 질문이 어리석은 것처럼 들리면 내버려두고 조언을하십시오.

그래서 here에서 하나의 매우 간단한 응용 프로그램을 개발했으며 다른 클래스 파일과 함께 아래에 게시 한 오류가 발생했습니다.

인터페이스

 package com.example.fragmentmodularui; 

public interface Communicator { 
public void respond(int i);} 

활동

 package com.example.fragmentmodularui; 



import android.support.v7.app.AppCompatActivity; 
import android.app.FragmentManager; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 


public class MainActivity extends AppCompatActivity implements Communicator { 

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

    @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; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    @Override 
    public void respond(int i) { 
     // TODO Auto-generated method stub 

     FragmentManager manager=getFragmentManager(); 
     FragmentB f2=(FragmentB) manager.findFragmentById(R.id.fragment_b); 
     f2.changeText(i); 
    } 
} 

FragmentA

package com.example.fragmentmodularui; 

import android.app.Fragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.webkit.WebView.FindListener; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

public class FragmentA extends Fragment { 
    ListView lst; 
    Communicator comm; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     View view = inflater.inflate(R.layout.fragment_a, container, false); 
     return view; 
    } 

    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onActivityCreated(savedInstanceState); 
     lst = (ListView) getActivity().findViewById(R.id.listView1); 
     comm = (Communicator) getActivity(); 
     ArrayAdapter<String> adap = new ArrayAdapter<String>(getActivity(), 
       R.array.title,android.R.layout.simple_list_item_1); 
     lst.setAdapter(adap); 

     lst.setOnItemClickListener(new OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> parent, View view, 
        int position, long id) { 
       // TODO Auto-generated method stub 
       comm.respond(position); 
      } 

     }); 
    } 
} 

FragmentB

 package com.example.fragmentmodularui; 

import android.app.Fragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.EditText; 

public class FragmentB extends Fragment { 
    EditText edt; 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     View view = inflater.inflate(R.layout.fragment_b, container, false); 
     return view; 
    } 
    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onActivityCreated(savedInstanceState); 
     edt=(EditText)getActivity().findViewById(R.id.editText1); 
    } 
    public void changeText(int i) 
    { 
     String arr[]=getResources().getStringArray(R.array.desc); 
     edt.setText(arr[i]); 

    } 
} 

fragment_b

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    android:background="#0000FF" > 

    <ListView 
     android:id="@+id/listView1" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" > 
    </ListView> 

</LinearLayout> 

fragment_a

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.fragmentmodularui.MainActivity" > 

    <fragment 
     android:id="@+id/fragment_a" 
     android:name="com.example.fragmentdemo.FragmentA" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" /> 

    <fragment 
     android:id="@+id/fragment_b" 
     android:name="com.example.fragmentdemo.FragmentB" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/fragment_a" 
     android:layout_marginTop="18dp" /> 

</RelativeLayout> 

activity.xml

는

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    android:background="#00FF00" > 

    <EditText 
     android:id="@+id/editText1" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:ems="10" > 

     <requestFocus /> 
    </EditText> 

</LinearLayout> 

로그인 오류가

07-22 04:05:03.156: E/AndroidRuntime(7176): FATAL EXCEPTION: main 
07-22 04:05:03.156: E/AndroidRuntime(7176): Process: com.example.fragmentmodularui, PID: 7176 
07-22 04:05:03.156: E/AndroidRuntime(7176): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragmentmodularui/com.example.fragmentmodularui.MainActivity}: android.view.InflateException: Binary XML file line #11: Error inflating class fragment 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.ActivityThread.access$800(ActivityThread.java:135) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.os.Handler.dispatchMessage(Handler.java:102) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.os.Looper.loop(Looper.java:136) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.ActivityThread.main(ActivityThread.java:5001) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at java.lang.reflect.Method.invoke(Method.java:515) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at dalvik.system.NativeStart.main(Native Method) 
07-22 04:05:03.156: E/AndroidRuntime(7176): Caused by: android.view.InflateException: Binary XML file line #11: Error inflating class fragment 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:755) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.view.LayoutInflater.inflate(LayoutInflater.java:353) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:276) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at com.example.fragmentmodularui.MainActivity.onCreate(MainActivity.java:17) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.Activity.performCreate(Activity.java:5231) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  ... 11 more 
07-22 04:05:03.156: E/AndroidRuntime(7176): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.fragmentdemo.FragmentA: make sure class name exists, is public, and has an empty constructor that is public 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.Fragment.instantiate(Fragment.java:597) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.Fragment.instantiate(Fragment.java:561) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.Activity.onCreateView(Activity.java:4778) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:34) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:80) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at com.example.fragmentmodularui.MainActivity.onCreateView(MainActivity.java:1) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  ... 21 more 
07-22 04:05:03.156: E/AndroidRuntime(7176): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.fragmentdemo.FragmentA" on path: DexPathList[[zip file "/data/app/com.example.fragmentmodularui-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.fragmentmodularui-1, /system/lib]] 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at java.lang.ClassLoader.loadClass(ClassLoader.java:497) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at java.lang.ClassLoader.loadClass(ClassLoader.java:457) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  at android.app.Fragment.instantiate(Fragment.java:583) 
07-22 04:05:03.156: E/AndroidRuntime(7176):  ... 27 more 

Answer 1

안드로이드 : activity.xml에서 조각의 이름이 다른 것 같다 너의 피 roject의 패키지 이름?

변경

스택 트레이스에서

<fragment 
     android:id="@+id/fragment_a" 
     android:name="com.example.fragmentmodularui.FragmentA" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" /> 

    <fragment 
     android:id="@+id/fragment_b" 
     android:name="com.example.fragmentmodularui.FragmentB" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/fragment_a" 
     android:layout_marginTop="18dp" />