Popluating списка с базой данных

я пытаюсь сделать мой просмотр списка появляются мои данные, которые сохраняются в базе данныхPopluating списка с базой данных

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View view = inflater.inflate(R.layout.fragment_main, container, false); 
    ImageView contactImage; 
    final EditText nametxt, emailTxt, phoneTxt, addressTxt; 
    nametxt = (EditText) view.findViewById(R.id.txtName); 
    emailTxt = (EditText) view.findViewById(R.id.txtEmail); 
    phoneTxt = (EditText) view.findViewById(R.id.txtPhone); 
    addressTxt = (EditText) view.findViewById(R.id.txtAddress); 
    dbHandler = new DatabaseHandler(getActivity().getApplicationContext()); 
    contactListView=(ListView)view.findViewById(R.id.listView); 
    contactListView.setAdapter(contactAdapter); 

    final Button addBtn = (Button) view.findViewById(R.id.btnadd); 
    addBtn.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Uri imageUri = Uri.parse("android.resource://org.intracode.contactmanager/drawable/no_user_logo.png"); 
      import_fragment.Contact contact = new import_fragment.Contact(dbHandler.getContactsCount(), String.valueOf(nametxt.getText()), String.valueOf(phoneTxt.getText()), String.valueOf(emailTxt.getText()), String.valueOf(addressTxt.getText()), imageUri); 
      if (!contactExists(contact)) { 
       dbHandler.createContact(contact); 
       Contacts.add(contact); 
       if (contactAdapter != null) contactAdapter.notifyDataSetChanged(); 
       Toast.makeText(getActivity().getApplicationContext(), String.valueOf(nametxt.getText()) + " has been added to your Contacts!", Toast.LENGTH_SHORT).show(); 
       resetAddContactPanel(); 
       return; 
      } 
      Toast.makeText(getActivity().getApplicationContext(), String.valueOf(nametxt.getText()) + " already exists. Please use a different name.", Toast.LENGTH_SHORT).show(); 
     } 
    }); 



    final Button addContact = (Button) view.findViewById(R.id.btnadd); 

    nametxt.addTextChangedListener(new TextWatcher() { 
     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

     } 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, int count) { 

      addContact.setEnabled(!nametxt.getText().toString().trim().equals("")); 


     } 

     @Override 
     public void afterTextChanged(Editable s) { 

     } 
    }); 


    return view; 


} 

ArrayAdapter<import_fragment.Contact> contactAdapter; 
ListView contactListView; 
DatabaseHandler dbHandler; 
int longClickedItemIndex; 



public void onActivityResult(int reqCode, int resCode, Intent data) { 
    Uri imageUri = Uri.parse("android.resource://org.intracode.contactmanager/drawable/no_user_logo.png"); 
    ImageView contactImageImgView; 
    contactImageImgView = (ImageView) getActivity().findViewById(R.id.ivContactImage); 

    if (resCode == Activity.RESULT_OK) { 
     if (reqCode == 1) { 
      imageUri = data.getData(); 
      contactImageImgView.setImageURI(data.getData()); 
     } 
    } 
} 


private void resetAddContactPanel() { 
    final EditText nametxt, emailTxt, phoneTxt, addressTxt; 
    nametxt = (EditText) getActivity().findViewById(R.id.txtName); 
    emailTxt = (EditText) getActivity().findViewById(R.id.txtEmail); 
    phoneTxt = (EditText) getActivity().findViewById(R.id.txtPhone); 
    addressTxt = (EditText) getActivity().findViewById(R.id.txtAddress); 
    nametxt.setText(""); 
    phoneTxt.setText(""); 
    emailTxt.setText(""); 
    addressTxt.setText(""); 
} 

public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) { 
    super.onCreateContextMenu(menu, view, menuInfo); 

    { 
     ImageView contactImageImgView; 

     contactImageImgView = (ImageView) view.findViewById(R.id.ivContactImage); 

     contactImageImgView.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent intent = new Intent(); 
       intent.setType("image/*"); 
       intent.setAction(Intent.ACTION_GET_CONTENT); 
       startActivityForResult(Intent.createChooser(intent, "Select Contact Image"), 1); 
      } 

     }); 


     if (dbHandler.getContactsCount() != 0) 
      Contacts.addAll(dbHandler.getAllContacts()); 

     populateList(); 
    } 


    menu.setHeaderIcon(R.drawable.pencil_icon); 
    menu.setHeaderTitle("Contact Options"); 
    menu.add(Menu.NONE, EDIT, menu.NONE, "Edit Contact"); 
    menu.add(Menu.NONE, DELETE, menu.NONE, "Delete Contact"); 
} 


public boolean onContextItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
     case EDIT: 
      // TODO: Implement editing a contact 
      break; 
     case DELETE: 
      dbHandler.deleteContact(Contacts.get(longClickedItemIndex)); 
      Contacts.remove(longClickedItemIndex); 
      contactAdapter.notifyDataSetChanged(); 
      break; 
    } 

    return super.onContextItemSelected(item); 
} 



private boolean contactExists(import_fragment.Contact contact) { 

    String name = contact.getName(); 
    int contactCount = Contacts.size(); 

    for (int i = 0; i < contactCount; i++) { 
     if (name.compareToIgnoreCase(Contacts.get(i).getName()) == 0) 
      return true; 
    } 
    return false; 
} 


private void populateList() { 
    contactAdapter = new ContactListAdapter(getActivity()); 
    contactListView.setAdapter(contactAdapter); 
} 


final List<import_fragment.Contact> Contacts = new ArrayList<import_fragment.Contact>(); 

private class ContactListAdapter extends ArrayAdapter<import_fragment.Contact> { 
    public ContactListAdapter(Context cntx) { 
     super(cntx, R.layout.fragment_import, Contacts); 
    } 

    @Override 
    public View getView(int position, View view, ViewGroup parent) { 
     if (view == null) 
      view = getActivity().getLayoutInflater().inflate(R.layout.fragment_import, parent, false); 

     import_fragment.Contact currentContact = Contacts.get(position); 

     TextView name = (TextView) view.findViewById(R.id.contactName); 
     name.setText(currentContact.getName()); 
     TextView phone = (TextView) view.findViewById(R.id.phoneNumber); 
     phone.setText(currentContact.getPhone()); 
     TextView email = (TextView) view.findViewById(R.id.emailAddress); 
     email.setText(currentContact.getEmail()); 
     TextView address = (TextView) view.findViewById(R.id.cAddress); 
     address.setText(currentContact.getAddress()); 


     return view; 
    } 
}

я получаю нулевую ошибку в этой строке contactListView.setAdapter(contactAdapter); Здесь DatabaseHelper

public class DatabaseHandler extends SQLiteOpenHelper { 

private static final int DATABASE_VERSION = 1; 

private static final String DATABASE_NAME = "contactManager", 
     TABLE_CONTACTS = "contacts", 
     KEY_ID = "id", 
     KEY_NAME = "name", 
     KEY_PHONE = "phone", 
     KEY_EMAIL = "email", 
     KEY_ADDRESS = "address", 
     KEY_IMAGEURI = "imageUri"; 

public DatabaseHandler(Context context) { 
    super(context, DATABASE_NAME, null, DATABASE_VERSION); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
    db.execSQL("CREATE TABLE " + TABLE_CONTACTS + "(" + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_NAME + " TEXT," + KEY_PHONE + " TEXT," + KEY_EMAIL + " TEXT," + KEY_ADDRESS + " TEXT," + KEY_IMAGEURI + " TEXT)"); 
} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS); 

    onCreate(db); 
} 

public void createContact(import_fragment.Contact contact) { 
    SQLiteDatabase db = getWritableDatabase(); 

    ContentValues values = new ContentValues(); 

    values.put(KEY_NAME, contact.getName()); 
    values.put(KEY_PHONE, contact.getPhone()); 
    values.put(KEY_EMAIL, contact.getEmail()); 
    values.put(KEY_ADDRESS, contact.getAddress()); 
    values.put(KEY_IMAGEURI, contact.getImageURI().toString()); 

    db.insert(TABLE_CONTACTS, null, values); 
    db.close(); 
} 


public import_fragment.Contact getContact(int id) { 
    SQLiteDatabase db = getReadableDatabase(); 

    Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID, KEY_NAME, KEY_PHONE, KEY_EMAIL, KEY_ADDRESS, KEY_IMAGEURI }, KEY_ID + "=?", new String[] { String.valueOf(id) }, null, null, null, null); 

    if (cursor != null) 
     cursor.moveToFirst(); 

    import_fragment.Contact contact = new import_fragment.Contact(Integer.parseInt(cursor.getString(0)), cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4), Uri.parse(cursor.getString(5))); 
    db.close(); 
    cursor.close(); 
    return contact; 
} 

public void deleteContact(import_fragment.Contact contact) { 
    SQLiteDatabase db = getWritableDatabase(); 
    db.delete(TABLE_CONTACTS, KEY_ID + "=?", new String[]{String.valueOf(contact.getId())}); 
    db.close(); 
} 

public int getContactsCount() { 
    SQLiteDatabase db = getReadableDatabase(); 
    Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_CONTACTS, null); 
    int count = cursor.getCount(); 
    db.close(); 
    cursor.close(); 

    return count; 
} 

public int updateContact(import_fragment.Contact contact) { 
    SQLiteDatabase db = getWritableDatabase(); 

    ContentValues values = new ContentValues(); 

    values.put(KEY_NAME, contact.getName()); 
    values.put(KEY_PHONE, contact.getPhone()); 
    values.put(KEY_EMAIL, contact.getEmail()); 
    values.put(KEY_ADDRESS, contact.getAddress()); 
    values.put(KEY_IMAGEURI, contact.getImageURI().toString()); 

    int rowsAffected = db.update(TABLE_CONTACTS, values, KEY_ID + "=?", new String[] { String.valueOf(contact.getId()) }); 
    db.close(); 

    return rowsAffected; 
} 

public List<import_fragment.Contact> getAllContacts() { 
    List<import_fragment.Contact> contacts = new ArrayList<import_fragment.Contact>(); 

    SQLiteDatabase db = getWritableDatabase(); 
    Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_CONTACTS, null); 

    if (cursor.moveToFirst()) { 
     do { 
      contacts.add(new import_fragment.Contact(Integer.parseInt(cursor.getString(0)), cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4), Uri.parse(cursor.getString(5)))); 
     } 
     while (cursor.moveToNext()); 
    } 
    cursor.close(); 
    db.close(); 
    return contacts; 
}

Здесь is logcat

01-27 07:45:45.795 3034-3034/com.al3almya.users.al3almya E/AndroidRuntime: FATAL EXCEPTION: main 
                     Process: com.al3almya.users.al3almya, PID: 3034 
                     java.lang.RuntimeException: Unable to start activity ComponentInfo{com.al3almya.users.al3almya/com.al3almya.users.al3almya.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference 
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) 
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                      at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                      at android.os.Handler.dispatchMessage(Handler.java:102) 
                      at android.os.Looper.loop(Looper.java:148) 
                      at android.app.ActivityThread.main(ActivityThread.java:5417) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
                     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference 
                      at com.al3almya.users.al3almya.main_fragment.onCreateView(main_fragment.java:65) 
                      at android.support.v4.app.Fragment.performCreateView(Fragment.java:1962) 
                      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067) 
                      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1248) 
                      at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738) 
                      at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1613) 
                      at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:330) 
                      at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:547) 
                      at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1237) 
                      at android.app.Activity.performStart(Activity.java:6253) 
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379) 
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)  
                      at android.app.ActivityThread.-wrap11(ActivityThread.java)  
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)  
                      at android.os.Handler.dispatchMessage(Handler.java:102)  
                      at android.os.Looper.loop(Looper.java:148)  
                      at android.app.ActivityThread.main(ActivityThread.java:5417)  
                      at java.lang.reflect.Method.invoke(Native Method)  
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Это import_fragment.xml [list view здесь] не в main_fragment.xml

<ImageView 
    android:layout_width="75dp" 
    android:layout_height="75dp" 
    android:id="@+id/ivContactImage" /> 

<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 


    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Contact Name" 
     android:id="@+id/contactName" 
     android:textSize="10dp" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Phone" 
     android:id="@+id/phoneNumber" 
     android:layout_gravity="left|center_vertical" 
     android:layout_marginTop="5dp"/> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Email" 
     android:id="@+id/emailAddress" 
     android:layout_gravity="left|center_vertical"/> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Address" 
     android:id="@+id/cAddress" 
     android:layout_gravity="left|center_vertical"/> 

    <ListView 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:id="@+id/listView" 
     android:layout_gravity="center"/> 

</LinearLayout>

я добавил все, но я теперь хочу знать, как появляются мои данные в виде списка, пожалуйста, дайте мне код не говори мне setAdapter, потому что, когда я установил это я получаю ошибку, Спасибо заранее

источник

2016-01-27 Maystro JeKa

опубликовать LogCat. –

вы написали 'contactListView.setAdapter (contactAdapter);' 2 раза в вашем коде, поэтому в каком случае вы получаете nullpointer? –

@IntelliJAmiya обновил мою тему –

Вы ищете listview в main_fragment и в main_fragmentlist view не доступны, поэтому он дает исключение нулевого указателя.

источник

2016-01-27 05:51:18 KDeogharkar

Хорошо, что я могу сделать, чтобы исправить это и показать вид списка? –

сначала отлаживать ваш код. Я думаю, что ваш список выглядит как null вместо contactAdapter. пожалуйста, отлаживайте и проверяйте – KDeogharkar

и переместите свой populateList в oncreateview вместо onCreateContextMenu – KDeogharkar

У вас есть какой-либо объект на вашей main_fragment линии 65 которого refrence является нулевым at com.al3almya.users.al3almya.main_fragment.onCreateView(main_fragment.java:65)

источник

2016-01-27 06:03:48

Popluating списка с базой данных

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