La vista elenco si arresta in modo verticale quando si fa clic sugli elementi (usando i frammenti)

Question

Sto utilizzando il layout dei frammenti nella mia app, questa app contiene un elenco. Cliccando sugli oggetti farà un lavoro. funziona bene in modalità orizzontale ma si arresta se si fa clic sugli elementi quando si è in modalità portait. Quale può essere il problema?

Ecco il mio codice:

MainAcitivity.java

package com.example.newfragment; 

import android.content.res.Configuration; 

import android.os.Bundle; 

import android.support.v4.app.FragmentActivity; 

import android.widget.Toast; 


public class MainActivity extends FragmentActivity { 

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

    @Override 
    public void onConfigurationChanged(Configuration newConfig) { 
     super.onConfigurationChanged(newConfig); 

     /*/ Checks the orientation of the screen 
     if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) { 
      setContentView(R.layout.activity_main); 
      Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show(); 
     } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){ 
      setContentView(R.layout.activity_main); 
      Toast.makeText(this, "portait", Toast.LENGTH_SHORT).show(); 
     }*/ 


    } 



} 

MenuFragment.java// mostra la visualizzazione elenco

package com.example.newfragment; 
    import java.io.File; 
    import java.util.ArrayList; 

    import android.support.v4.app.ListFragment; 
    import android.os.Bundle; 
    import android.os.Environment; 
    import android.view.LayoutInflater; 
    import android.view.View; 
    import android.view.ViewGroup; 
    import android.widget.ArrayAdapter; 
    import android.widget.ListView; 

    public class MenuFragment extends ListFragment { 

    int i; 

    private String[] FilePathStrings; 
    private String[] FileNameStrings; 
    File[] listFile;//for photo 
    String[] name = new String[] 
      { "Sri","Sud","Urmila","Amrita","Indra","Ayan", 
      "Leo","Neymar","Robin","Ian","Suarez","Mesut","Bastin", 
      "Rooney","Ranti","Dong Hyun","Barisich","Andrew" }; 

    String[] address = new String[] 
      {"Dumdum","Dumdum","Dumdum","Dumdum","Lake Town", 
      "Salkia","Argentina","Brazil","Netherlands"}; 

    String [] mobile = new String[]{"456456456","56564565","787687866", 
       "645645645","5654576457","76897978978","768768567"}; 



    String [] photo = new String[]{}; 



    @Override 
    public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) { 
     View view =inflater.inflate(R.layout.list_fragment, container, false); 
     ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), 
       android.R.layout.simple_list_item_1, name); 
     setListAdapter(adapter); 

     return view; 





    } 



    /////////////////////sending data to TextFragment////////////////// 
    @Override 
    public void onListItemClick(ListView l, View v, int position, long id) { 


     ///////////accessing files from sd card/////// 
     File file = new File(Environment.getExternalStorageDirectory() +"/Frag_list/"); 
     if (file.isDirectory()) { 
      listFile = file.listFiles(); 

      // Create a String array for FilePathStrings 
      FilePathStrings = new String[listFile.length]; 


      for (i = 0; i < listFile.length; i++) { 
       // Get the path of the image file 
       FilePathStrings[i] = listFile[i].getAbsolutePath(); 

      } 
     } 

     ////////////////////////////// 


     TextFragment txt = (TextFragment)getFragmentManager().findFragmentById(R.id.fragment2); 
     txt.change(position,address[position],mobile[position]); 
     getListView().setSelector(android.R.color.holo_blue_dark); 


    } 
} 

TextFragment.java// per le azioni su clic sugli elementi

package com.example.newfragment; 

import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FilenameFilter; 
import java.io.InputStream; 

import android.R.string; 
import android.support.v4.app.Fragment; 
import android.app.Activity; 
import android.content.ContentResolver; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.PixelFormat; 
import android.hardware.Camera; 
import android.hardware.Camera.Parameters; 
import android.net.Uri; 
import android.os.Bundle; 
import android.os.Environment; 
import android.provider.MediaStore; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.TextView; 
import android.widget.Toast; 


public class TextFragment extends Fragment implements OnClickListener { 
    TextView text,add; 
    private ImageView img; 
    Button b; 
    int value; 
    String mobile; 
    File photo; 
    private static final int CAMERA_REQUEST = 1888; 
    Camera camera; 


    ////////////data received here//////////// 
    public void change(int txt, String txt1, String txt2){ 


     add.setText(txt1); 
     value = txt; 
     mobile = txt2; 

     //photo = f; 
     //File image = new File(Environment.getExternalStorageDirectory() +"/Frag_list/"+value+".jpg"); 

     /*if(photo.exists()) 
     { 
      img.setImageBitmap(BitmapFactory.decodeFile(photo.getAbsolutePath())); 
     } 
     else 
      img.setImageResource(R.drawable.ic_launcher);*/ 

    } 

    @Override 

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

     View view = inflater.inflate(R.layout.text_fragment, container, false); 
     //text= (TextView) view.findViewById(R.id.AndroidOs); 
     add= (TextView)view.findViewById(R.id.address); 
     img= (ImageView)view.findViewById(R.id.img); 

     ////////////////// 
     /*File image = new File(Environment.getExternalStorageDirectory() +"/Frag_list/"+value+".jpg"); 
     if(image.exists()) 
      { 

        img.setImageBitmap(BitmapFactory.decodeFile(image.getAbsolutePath()));/////////////setting image in imageview 
      }*/ 


     ////////////////////// 
     b= (Button)view.findViewById(R.id.b); 

     img.setOnClickListener(this); 
     b.setOnClickListener(this); 



     return view; 

    } 



    @Override 
    public void onClick(View v) { 
     // TODO Auto-generated method stub 
     if(v.equals(img)) 
     { 
      //Toast.makeText(getContext(), "Camera", Toast.LENGTH_LONG).show(); 


      /*///////////camera hardware/////////// 
      Parameters parameters = camera.getParameters();//////////////PROBLEM: APP GETTING CRASHED WHEN USED 
      parameters.setPictureSize(80, 80); 
      camera.setParameters(parameters); 
      camera = Camera.open(); 
      ///////////////////////////////////////*/ 



      /*Clicking and saving image to sd card*/ 
      ////////////////////////////////////// 
      File file = new File(Environment.getExternalStorageDirectory(), "Frag_list"); 
      file.mkdirs(); 

      String path = Environment.getExternalStorageDirectory() +"/Frag_list/"+value+".jpg"; 
      File file2= new File(path); 
      Uri outputFileUri = Uri.fromFile(file2); 
      Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
      //intent.putExtra("android.media.action.IMAGE_CAPTURE", outputFileUri); ///////for displaying image 
      intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri); //////////for saving image 

      /*Bundle b = new Bundle(); 
      b.putString("android.media.action.IMAGE_CAPTURE", outputFileUri);*/ 

      startActivityForResult(intent, CAMERA_REQUEST); 
      ///////////////////////////////////// 



     } 

     if(v.equals(b)) 
     { 
      //Toast.makeText(getContext(), "mobile:"+mobile, Toast.LENGTH_LONG).show(); 

      /*Calling number*/ 
      //////////////////////////////////////////////// 
      Uri number = Uri.parse("tel:" +mobile); 
      Intent callIntent = new Intent(Intent.ACTION_CALL, number); 
      startActivity(callIntent); 
      //////////////////////////////////////////////// 

     } 

    } 

    ///setting image in display 
    /////////////////////////////////////////////////////////// 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
      if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) 
      { 
       /*if (data != null) { 


        File photo = new File(Environment.getExternalStorageDirectory()+"/Frag_list/"+value+".jpg"); 

        Uri imgUri=Uri.fromFile(photo); 
        img.setImageURI(imgUri); 

        /* 
        img.setImageBitmap((Bitmap) data.getExtras().get("data")); // this is image view where you want to set image 
        Log.d("camera ---- > ", "" + data.getExtras().get("data")); 

       }*/ 

       File image = new File(Environment.getExternalStorageDirectory() +"/Frag_list/"+value+".jpg"); 
       if(image.exists()){ 

         img.setImageBitmap(BitmapFactory.decodeFile(image.getAbsolutePath()));/////////////setting image in imageview 
      } 

      } 


     } 
    ////////////////////*/ 


} 

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.newfragment" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk 
     android:minSdkVersion="14" 
     android:targetSdkVersion="21" /> 

    <uses-permission android:name="android.permission.CAMERA" /> 
    <uses-feature android:name="android.hardware.camera" android:required="false" /> 
    <uses-feature android:name="android.hardware.camera.autofocus" /> 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
    <uses-permission android:name="android.permission.CALL_PHONE" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     > 
     <activity 
      android:name=".MainActivity" 
      android:configChanges="orientation" 
      > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

    </application> 

</manifest> 

Logcat

10-05 11:07:06.480: E/AndroidRuntime(4921): FATAL EXCEPTION: main 
10-05 11:07:06.480: E/AndroidRuntime(4921): java.lang.NullPointerException 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at com.example.newfragment.TextFragment.change(TextFragment.java:48) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at com.example.newfragment.MenuFragment.onListItemClick(MenuFragment.java:85) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at android.support.v4.app.ListFragment$2.onItemClick(ListFragment.java:58) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at android.widget.AdapterView.performItemClick(AdapterView.java:298) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at android.widget.AbsListView.performItemClick(AbsListView.java:1128) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at android.widget.AbsListView$PerformClick.run(AbsListView.java:2815) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at android.widget.AbsListView$1.run(AbsListView.java:3574) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at android.os.Handler.handleCallback(Handler.java:800) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at android.os.Handler.dispatchMessage(Handler.java:100) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at android.os.Looper.loop(Looper.java:194) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at android.app.ActivityThread.main(ActivityThread.java:5371) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at java.lang.reflect.Method.invoke(Method.java:525) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
10-05 11:07:06.480: E/AndroidRuntime(4921):  at dalvik.system.NativeStart.main(Native Method) 

ActivityMain.xml

<?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" > 

    <fragment 
     android:id="@+id/list_Fragment" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_weight="1" 
     class="com.example.newfragment.MenuFragment" > 
    </fragment> 

</LinearLayout> 

ActivityMain.xmldi landscpae

<LinearLayout 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:orientation="horizontal" 
    tools:context="com.example.newfragment.MainActivity"> 


    <fragment 
     android:layout_height="match_parent" 
     android:layout_width="0dp" 
     android:layout_weight="1" 
     class="com.example.newfragment.MenuFragment" 
     android:id="@+id/fragment"/> 
    <fragment 
     android:layout_width="0dp" 
     android:layout_height="match_parent" 
     android:layout_weight="2" 
     class="com.example.newfragment.TextFragment" 
     android:id="@+id/fragment2"/> 




</LinearLayout> 

ListFragment.xml// per la listview

<?xml version="1.0" encoding="utf-8"?> 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
    <ListView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@android:id/list" /> 
</LinearLayout> 

TextFragment.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="#5ba4e5" 
    > 
    <ImageView 
       android:id="@+id/img" 
       android:layout_width="100dp" 
       android:layout_height="100dp" 
       android:layout_marginTop="20dp" 
       android:layout_marginLeft="30dp" 
       android:onClick="imageClick" 
       android:src="@drawable/ic_launcher" 
       /> 

    <TableLayout 
     android:id="@+id/tb" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     > 

     <TableRow> 

      <TextView 
       android:id="@+id/address" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="Address" 
       android:textColor="#ffffff" 
       android:textSize="20sp" 
       android:layout_marginLeft="40dp" 
       android:layout_marginTop="30dp" /> 
     </TableRow> 

     <TableRow 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" > 

      <Button 
       android:id="@+id/b" 
       android:layout_marginLeft="40dp" 
       android:layout_marginTop="30dp" 
       android:layout_span="2" 
       android:background="#ffffff" 
       android:text="Mobile" 

       android:textColor="#000000" /> 
     </TableRow> 
    </TableLayout> 

</LinearLayout> 

Screenshots

Situazione attuale della modalità portait dopo aver seguito i suggerimenti proposti nelle risposte:

UPDATE

Sono in grado di superare il problema crash e per passare alla schermata successiva dopo aver cliccato su elementi dal listview, mentre in modalità portait attualmente, ma la vista sta tornando nulla lì; significa che il contenuto che voglio visualizzare lì (parte blu dello screenshot) non viene visualizzato, lo schermo è vuoto.

Ecco il codice aggiornato:

MenuFragment.java

public class MenuFragment extends ListFragment { 

    int i; 

    private String[] FilePathStrings; 
    private String[] FileNameStrings; 
    File[] listFile;//for photo 
    String[] name = new String[] 
      { "Sri","Sud","Urmila","Amrita","Indra","Ayan", 
      "Leo","Neymar","Robin","Ian","Suarez","Mesut","Bastin", 
      "Rooney","Ranti","Dong Hyun","Barisich","Andrew" }; 

    String[] address = new String[] 
      {"Dumdum","Dumdum","Dumdum","Dumdum","Lake Town", 
      "Salkia","Argentina","Brazil","Netherlands"}; 

    String [] mobile = new String[]{"456456456","56564565","787687866", 
       "645645645","5654576457","76897978978","768768567"}; 



    String [] photo = new String[]{}; 



    @Override 
    public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) { 
     View view =inflater.inflate(R.layout.list_fragment, container, false); 
     ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), 
       android.R.layout.simple_list_item_1, name); 
     setListAdapter(adapter); 



     return view; 


    } 





    /////////////////////sending data to TextFragment////////////////// 
    @Override 
    public void onListItemClick(ListView l, View v, int position, long id) { 

///////////accessing files from sd card/////// 
     File file = new File(Environment.getExternalStorageDirectory() +"/Frag_list/"); 
     if (file.isDirectory()) { 
      listFile = file.listFiles(); 

      // Create a String array for FilePathStrings 
      FilePathStrings = new String[listFile.length]; 


      for (i = 0; i < listFile.length; i++) { 
       // Get the path of the image file 
       FilePathStrings[i] = listFile[i].getAbsolutePath(); 

      } 
     } 

     ////////////////////////////// 


     int orientation = getResources().getConfiguration().orientation; 
     if (Configuration.ORIENTATION_LANDSCAPE == orientation) { 
      //Do SomeThing; // Landscape 




      TextFragment txt = (TextFragment)getFragmentManager().findFragmentById(R.id.fragment2); 
      txt.change(position,address[position],mobile[position]); 
      getListView().setSelector(android.R.color.holo_blue_dark); 

     } else { 
      //Do SomeThing; // Portrait 
      //Toast.makeText(getContext(),address[position] , Toast.LENGTH_SHORT).show(); 

////////////// codice aggiornato qui ////// /////////

 **Intent intent = new Intent(getActivity(), TextFragment2.class); 
     Bundle bundle = new Bundle(); 
     bundle.putString("message", address[position]); 
     intent.putExtras(bundle); 
     getActivity().startActivity(intent);** 





} 

} 

}

TextFragment.java

public class TextFragment2 extends Activity implements OnClickListener { 
    TextView text,add; 
    private ImageView img; 
    Button b; 
    int value; 
    String mobile,txt; 
    File photo; 
    private static final int CAMERA_REQUEST = 1888; 
    Camera camera; 

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

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

     add= (TextView)view.findViewById(R.id.address); 
     img= (ImageView)view.findViewById(R.id.img); 

     ////////////////// 
     /*File image = new File(Environment.getExternalStorageDirectory() +"/Frag_list/"+value+".jpg"); 
     if(image.exists()) 
      { 

        img.setImageBitmap(BitmapFactory.decodeFile(image.getAbsolutePath()));/////////////setting image in imageview 
      }*/ 


     ////////////////////// 
     b= (Button)view.findViewById(R.id.b); 

     img.setOnClickListener(this); 
     b.setOnClickListener(this); 

     //Intent intent = getActivity().getIntent(); 
     //String message = intent.getStringExtra("message"); 

///////////////////// codice aggiornato qui //////////// ////

Bundle bundle = getIntent(). GetExtras(); txt = bundle.getString ("messaggio");

**add.setText(txt);** 

    return view; 

} 



@Override 
public void onClick(View v) { 
    // TODO Auto-generated method stub 
    if(v.equals(img)) 
    { 
     //Toast.makeText(getContext(), "Camera", Toast.LENGTH_LONG).show(); 


     /*///////////camera hardware/////////// 
     Parameters parameters = camera.getParameters();//////////////PROBLEM: APP GETTING CRASHED WHEN USED 
     parameters.setPictureSize(80, 80); 
     camera.setParameters(parameters); 
     camera = Camera.open(); 
     ///////////////////////////////////////*/ 



     /*Clicking and saving image to sd card*/ 
     ////////////////////////////////////// 
     File file = new File(Environment.getExternalStorageDirectory(), "Frag_list"); 
     file.mkdirs(); 

     String path = Environment.getExternalStorageDirectory() +"/Frag_list/"+value+".jpg"; 
     File file2= new File(path); 
     Uri outputFileUri = Uri.fromFile(file2); 
     Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
     //intent.putExtra("android.media.action.IMAGE_CAPTURE", outputFileUri); ///////for displaying image 
     intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri); //////////for saving image 

     /*Bundle b = new Bundle(); 
     b.putString("android.media.action.IMAGE_CAPTURE", outputFileUri);*/ 

     startActivityForResult(intent, CAMERA_REQUEST); 
     ///////////////////////////////////// 



    } 

    if(v.equals(b)) 
    { 
     //Toast.makeText(getContext(), "mobile:"+mobile, Toast.LENGTH_LONG).show(); 

     /*Calling number*/ 
     //////////////////////////////////////////////// 
     Uri number = Uri.parse("tel:" +mobile); 
     Intent callIntent = new Intent(Intent.ACTION_CALL, number); 
     startActivity(callIntent); 
     //////////////////////////////////////////////// 

    } 

} 

///setting image in display 
/////////////////////////////////////////////////////////// 
public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) 
     { 
      /*if (data != null) { 


       File photo = new File(Environment.getExternalStorageDirectory()+"/Frag_list/"+value+".jpg"); 

       Uri imgUri=Uri.fromFile(photo); 
       img.setImageURI(imgUri); 

       /* 
       img.setImageBitmap((Bitmap) data.getExtras().get("data")); // this is image view where you want to set image 
       Log.d("camera ---- > ", "" + data.getExtras().get("data")); 

      }*/ 

      File image = new File(Environment.getExternalStorageDirectory() +"/Frag_list/"+value+".jpg"); 
      if(image.exists()){ 

        img.setImageBitmap(BitmapFactory.decodeFile(image.getAbsolutePath()));/////////////setting image in imageview 
     } 

     } 


    } 
////////////////////*/ 

}

---

CASO risolto

Cambiato il pubblico Visualizza oncreateView al protected void onCreate! :)

public class TextFragment2 extends Activity implements OnClickListener { 
    TextView text,add; 
    private ImageView img; 
    Button b; 
    int value; 
    String mobile,txt; 
    File photo; 
    private static final int CAMERA_REQUEST = 1888; 
    Camera camera; 

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

     add= (TextView)findViewById(R.id.address); 
     img= (ImageView)findViewById(R.id.img); 

     b= (Button)findViewById(R.id.b); 

     img.setOnClickListener(this); 
     b.setOnClickListener(this); 
     Bundle bundle= getIntent().getExtras(); 
     txt= bundle.getString("message"); 
     add.setText(txt); 

    } 

Screenshots di modalità portrait:

Answer 1

public class TextFragment2 extends Activity implements OnClickListener { 
    TextView text,add; 
    private ImageView img; 
    Button b; 
    int value; 
    String mobile,txt; 
    File photo; 
    private static final int CAMERA_REQUEST = 1888; 
    Camera camera; 

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

     add= (TextView)findViewById(R.id.address); 
     img= (ImageView)findViewById(R.id.img); 

     b= (Button)findViewById(R.id.b); 

     img.setOnClickListener(this); 
     b.setOnClickListener(this); 
     Bundle bundle= getIntent().getExtras(); 
     txt= bundle.getString("message"); 
     add.setText(txt); 

    } 

Answer 2

si chiama un metodo di change che sta cercando di utilizzare un TextView add che sta avendo un riferimento null. Inizializzalo gentilmente prima di usarlo.

Questo è ciò che è la causa principale del problema:

add.setText(txt1); 

Qui, aggiungere è che punta a nulla, e si utilizza quello riferimento null.

Un altro punto di problema sembra nell'id ie fragment2 di fragment nel layout ActivityMain.xml, come menzionato da @Syed Nazar Muhammad. Grazie per quello.

TextFragment txt = (TextFragment) getFragmentManager().findFragmentById(R.id.fragment2); 

R.id.fragment2 manca in ActivityMain.xml

Speranza che aiuta !!!

Answer 3

Il problema è qui:

TextFragment txt = (TextFragment)getFragmentManager().findFragmentById(R.id.fragment2); 

si sta cercando di trovare il R.id.fragment2 che è solo nel layout di paesaggio MainActivity, quando si ruota in orizzontale che trova il fragment2 id, ma quando ruotare il dispositivo in modalità verticale l'id non viene trovato poiché non è presente nella modalità verticale di MainActivity.