어댑터에서 sqlite listview 항목을 업데이트하는 방법은 무엇입니까?

나는 항목의 필드를 업데이트하려면, 어댑터에서 sqlite listview 항목을 업데이트하는 방법은 무엇입니까?

내가 ImageButton을 클릭하면, ImageButton와 ListView 있습니다. 여기

내가 ImageButton을 클릭하면

package com.magicstarme.virtualsongbook; 

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.SQLException; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.util.Log; 


/** 
* Created by Joe on 7/7/2016. 
*/ 
public class FragmentOne_DbAdapter { 

    public static final String KEY_ROWID = "_id"; 
    public static final String KEY_TITLE = "title"; 
    public static final String KEY_ARTIST = "artist"; 
    public static final String KEY_VOLUME = "volume"; 
    public static final String KEY_TYPE = "type"; 
    public static final String KEY_FAVORITE = "favorite"; 
    public static final String KEY_NUMBER = "number"; 

    private static final String TAG = "FragmentOne_DbAdapter"; 
    private DatabaseHelper mDbHelper; 
    private SQLiteDatabase mDb; 

    private static final String DATABASE_NAME = "Virtualsongbook"; 
    private static final String SQLITE_TABLE = "Player1"; 
    private static final int DATABASE_VERSION = 1; 

    private final Context mCtx; 

    private static final String DATABASE_CREATE = 
      "CREATE TABLE if not exists " + SQLITE_TABLE + " (" + 
        KEY_ROWID + " integer PRIMARY KEY autoincrement," + 
        KEY_TITLE + "," + 
        KEY_ARTIST + "," + 
        KEY_VOLUME + "," + 
        KEY_TYPE + "," + 
        KEY_FAVORITE + "," + 
        KEY_NUMBER + ")"; 

    private static class DatabaseHelper extends SQLiteOpenHelper { 

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


     @Override 
     public void onCreate(SQLiteDatabase db) { 
      Log.w(TAG, DATABASE_CREATE); 
      db.execSQL(DATABASE_CREATE); 
     } 

     @Override 
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
      Log.w(TAG, "Upgrading database from version " + oldVersion + " to " 
        + newVersion + ", which will destroy all old data"); 
      db.execSQL("DROP TABLE IF EXISTS " + SQLITE_TABLE); 
      onCreate(db); 
     } 
    } 

    public FragmentOne_DbAdapter(Context ctx) { 
     this.mCtx = ctx; 
    } 

    public FragmentOne_DbAdapter open() throws SQLException { 
     mDbHelper = new DatabaseHelper(mCtx); 
     mDb = mDbHelper.getWritableDatabase(); 
     return this; 
    } 

    public void close() { 
     if (mDbHelper != null) { 
      mDbHelper.close(); 
     } 
    } 

    public long createPlayer1(String title, 
           String artist, String volume, 
           String type, String number) { 

     ContentValues initialValues = new ContentValues(); 
     initialValues.put(KEY_TITLE, title); 
     initialValues.put(KEY_ARTIST, artist); 
     initialValues.put(KEY_VOLUME, volume); 
     initialValues.put(KEY_TYPE, type); 
     initialValues.put(KEY_NUMBER, number); 

     return mDb.insert(SQLITE_TABLE, null, initialValues); 
    } 

    public boolean deleteAllPlayer1() { 

     int doneDelete = 0; 
     doneDelete = mDb.delete(SQLITE_TABLE, null , null); 
     Log.w(TAG, Integer.toString(doneDelete)); 
     return doneDelete > 0; 

    } 

    public Cursor fetchPlayer1ByTitle(String titleText) throws SQLException { 
     Log.w(TAG, titleText); 
     Cursor mCursor = null; 
     if (titleText == null || titleText.length() == 0) { 
      mCursor = mDb.query(SQLITE_TABLE, new String[] {KEY_ROWID, 
          KEY_TITLE, KEY_ARTIST, KEY_VOLUME, KEY_TYPE, KEY_FAVORITE, KEY_NUMBER}, 
        null, null, null, null, null); 

     } 
     else { 
      mCursor = mDb.query(true, SQLITE_TABLE, new String[] {KEY_ROWID, 
          KEY_TITLE, KEY_ARTIST, KEY_VOLUME, KEY_TYPE, KEY_FAVORITE, KEY_NUMBER}, 
        KEY_TITLE + " like '%" + titleText + "%'", null, 
        null, null, null, null); 
     } 
     if (mCursor != null) { 
      mCursor.moveToFirst(); 
     } 
     return mCursor; 

    } 

    public Cursor fetchAllPlayer1() { 

     Cursor mCursor = mDb.query(SQLITE_TABLE, new String[] {KEY_ROWID, 
         KEY_TITLE, KEY_ARTIST, KEY_VOLUME, KEY_TYPE, KEY_FAVORITE, KEY_NUMBER}, 
       null, null, null, null, null); 

     if (mCursor != null) { 
      mCursor.moveToFirst(); 
     } 
     return mCursor; 
    } 

    public void insertPlayer1Songlist() { 

     createPlayer1("Song Title 1", "Artist 1", "Vol 1","","12341"); 
     createPlayer1("Song Title 2", "Artist 2", "Vol 2","","12342"); 
     createPlayer1("Song Title 3", "Artist 3", "Vol 2","","12343"); 
     createPlayer1("Song Title 4", "Artist 4", "Vol 3","","12344"); 
     createPlayer1("Song Title 5", "Artist 5", "Vol 3","","12345"); 
     createPlayer1("Song Title 6", "Artist 6", "Vol 4","","12346"); 
     createPlayer1("Joe Song Title 7", "Artist 7", "Vol 4","","12347"); 
     createPlayer1("Song Title 8", "Artist 8", "Vol 1","","12348"); 
     createPlayer1("Song Title 9", "Artist 9", "Vol 1","","12349"); 
     createPlayer1("Song Title 1", "Artist 1", "Vol 1","","12341"); 
     createPlayer1("Song Title 2", "Artist 2", "Vol 2","","12342"); 
     createPlayer1("Song Title 3", "Artist 3", "Vol 2","","12343"); 
     createPlayer1("Song Title 4", "Artist 4", "Vol 3","","12344"); 
     createPlayer1("Song Title 5", "Artist 5", "Vol 3","","12345"); 
     createPlayer1("Song Title 6", "Artist 6", "Vol 4","","12346"); 
     createPlayer1("Song Title 7", "Artist 7", "Vol 4","","12347"); 
     createPlayer1("Song Title 8", "Artist 8", "Vol 1","","12348"); 
     createPlayer1("Song Title 9", "Artist 9", "Vol 1","","12349"); 
     createPlayer1("Joehamir Balabadan", "Artist 1", "Vol 1","","12341"); 
     createPlayer1("Song Title 2", "Artist 2", "Vol 2","","12342"); 
     createPlayer1("Song Title 3", "Artist 3", "Vol 2","","12343"); 
     createPlayer1("Song Title 4", "Artist 4", "Vol 3","","12344"); 
     createPlayer1("Song Title 5", "Artist 5", "Vol 3","","12345"); 
     createPlayer1("Song Title 6", "Artist 6", "Vol 4","","12346"); 
     createPlayer1("Song Title 7", "Artist 7", "Vol 4","","12347"); 
     createPlayer1("Song Title 8", "Artist 8", "Vol 1","","12348"); 
     createPlayer1("Song Title Joe 9", "Artist 9", "Vol 1","","12349"); 

    } 
}

, 내가 좋아하는 필드가 1 인 경우 다음 1 에 널 (null)에서 마음에 드는 필드를 업데이트 할 내 DbAdapter

@Override 
    public void bindView(View view, Context context, Cursor cursor) { 
     // TODO Auto-generated method stub 
     TextView txtTitle = (TextView) view.findViewById(R.id.title); 
     TextView txtArtist = (TextView) view.findViewById(R.id.artist); 
     TextView txtVolume = (TextView) view.findViewById(R.id.volume); 
     TextView txtNumber = (TextView) view.findViewById(R.id.number); 

     ImageButton buttonHeart = (ImageButton) view.findViewById(R.id.heart); 


     final int _id = cursor.getInt(cursor.getColumnIndexOrThrow("_id")); 
     String title = cursor.getString(cursor.getColumnIndexOrThrow("title")); 
     String artist = cursor.getString(cursor.getColumnIndexOrThrow("artist")); 
     String volume = cursor.getString(cursor.getColumnIndexOrThrow("volume")); 
     final String favorite = cursor.getString(cursor.getColumnIndexOrThrow("favorite")); 
     String number = cursor.getString(cursor.getColumnIndexOrThrow("number")); 

     // Populate fields with extracted properties 
     txtTitle.setText(title); 
     txtArtist.setText(artist); 
     txtVolume.setText(volume); 
     txtNumber.setText(number); 

     if(favorite==null) { 
      buttonHeart.setImageResource(R.drawable.heart); 
     }else if(favorite.matches("1")){ 
      buttonHeart.setImageResource(R.drawable.heartred); 
     } 

     buttonHeart.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View arg0) { 
       if (arg0 != null) { 
        //UPDATE QUERY HERE 
       } 
      } 
     }); 

    }

의 Bindview

내 어댑터이며, 여기에 , null로 업데이트하고 싶습니다. 내가 마음에서 ImageButton ..

이 hearthred와 그 반대를 클릭하면

도 나는 imageResource을 변경하고 싶습니다.

출처

2016-07-08 Joehamir

if(favorite.matches("0")) { 
     buttonHeart.setImageResource(R.drawable.heart); 
    }else if(favorite.matches("1")){ 
     buttonHeart.setImageResource(R.drawable.heartred); 
    }

3> 통화 updateItemFavorite 화상 버튼

buttonHeart.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View arg0) { 
      if (arg0 != null) { 
       FragmentOne_DbAdapter database=new FragmentOne_DbAdapter(context); 

    if(favorite.matches("0")) { 
     database.updateItemFavorite(_id,"1"); 
    }else if(favorite.matches("1")){ 
     database.updateItemFavorite(_id,"0"); 
    }

0 클릭으로 대체>

public int updateItemFavorite(int rowId, String favorite) { 
    ContentValues values = new ContentValues(); 
    values.put(KEY_FAVORITE, favorite); 
    return mDb.update(SQLITE_TABLE, values, KEY_ROWID + " = ?", new String[] { String.valueOf(rowId) }); 
}

2 FragmentOne_DbAdapter

이 코드

if(favorite==null) { 
     buttonHeart.setImageResource(R.drawable.heart); 
    }else if(favorite.matches("1")){ 
     buttonHeart.setImageResource(R.drawable.heartred); 
    }

를이 방법을 추가 가상 방법 '을 호출하는 시도 :;

adapter.notifyDataSetChanged는() // 여기에 어댑터는 내가 유용

출처

2016-07-08 04:04:33

메신저이 오류 ava.lang.NullPointerException을 얻는 당신에 희망을 내 어댑터 클래스 객체

 } } });

입니다 int object.database.sqlite.SQLiteDatabase.update (java.lang.String, android.content.ContentValues, java.lang.String, String []) 'null 객체 참조 – Joehamir

@ joehamirbalabadan.com에서 사용하십시오 지금 답변을 업데이트하면 유용합니다. 그러면 바로이 오류가 발생합니다. –

이 오류가 계속 발생합니다. java.lang.NullPointerException : 가상 메소드 'int android.database .sqlite.SQLiteDatabase.update (java.lang.String, android.content.ContentValues, java.lang.String, java.lang.String []) 'NULL 객체 참조에서 at com.magicstarme.virtualsongbook.FragmentOne_DbAdapter.updateItemFavorite (FragmentOne_DbAdapter.java:143) – Joehamir

어댑터에서 sqlite listview 항목을 업데이트하는 방법은 무엇입니까?

답변

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