ListView不显示数据库中的所有数据

时间：2015-02-04 22:00:00

标签： java android database sqlite listview

我觉得这有点像一个noob问题而且我错过了一些显而易见的东西，但我只是习惯了Android编程，而且我遇到了SQLiteDatabase和ListView的问题。

今天早些时候，我创建了一个ListView，它显示了数据库中的夹具列表。我让它工作，保存并离开它。我已经回到它并在数据库中添加了更多的灯具，但是当我重新运行应用程序时，只有前4个灯具继续出现（我最初创建的灯具），当有18个灯具时。

这是FixtureDB类：

public class FixturesDB extends SQLiteOpenHelper {

//Database name
private static String dbname = "fixtureList";
//Database version
private static int version = 1;
//Primary key field
public static final String KEY_ROW_ID = "_id";
//Field which stores the fixture data
public static final String KEY_DATE = "fixture_date";
//Field which stores the fixture team
public static final String KEY_TEAM = "fixture_team";
//Field which stores the fixture competition
public static final String KEY_COMPETITION = "fixture_competition";
//Constant to store the table name
public static final String DATABASE_TABLE = "fixture_table";
//Instance variable for SQLiteDatabase
private SQLiteDatabase mDB;

//Constructor method
public FixturesDB(Context context) {
    super(context, dbname, null, version);
    this.mDB = getWritableDatabase();
}

/**
 * This method is called providing the database does not exist
 */
@Override
public void onCreate(SQLiteDatabase db) {
    String sql = "create table " + DATABASE_TABLE + " ( " + KEY_ROW_ID + " integer primary key autoincrement , "
            + KEY_DATE + " text , " + KEY_TEAM + " text , " + KEY_COMPETITION + " text ) ";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '04/02/2015', 'Bolton', 'FA Cup' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '07/02/2015', 'Everton', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '10/02/2015', 'Tottenham', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '19/02/2015', 'Besiktas', 'Europa League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '22/02/2015', 'Southampton', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '26/02/2015', 'Besiktas', 'Europa League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '01/03/2015', 'Man City', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '04/03/2015', 'Burnley', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '16/03/2015', 'Swansea', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '22/03/2015', 'Man Utd', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '04/04/2015', 'Arsenal', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '11/04/2015', 'Newcastle', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '18/04/2015', 'Hull', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '25/04/2015', 'West Brom', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '02/05/2015', 'QPR', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '09/05/2015', 'Chelsea', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '16/05/2015', 'Crystal Palace', 'Premier League' )";
    db.execSQL(sql);
    sql = "insert into " + DATABASE_TABLE + " ( " + KEY_DATE + "," + KEY_TEAM + "," + KEY_COMPETITION + " ) "
            + " values ( '24/05/2015', 'Stoke', 'Premier League' )";
    db.execSQL(sql);
}

/**
 * Returns all the fixtures in the database
 */
public Cursor getFixtures() {
    return mDB.query(DATABASE_TABLE, new String[] { KEY_ROW_ID, KEY_DATE, KEY_TEAM, KEY_COMPETITION } 
    , null, null, null, null, KEY_TEAM + " asc ");
}


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

}

FixtureContentProvider类：

public class FixtureContentProvider extends ContentProvider{

public static final String PROVIDER_NAME = "com.example.project.fixture";


public static final Uri CONTENT_URI = Uri.parse("content://" + PROVIDER_NAME + "/fixtures" );


private static final int fixture = 1;

private static final UriMatcher uriMatcher ;
static {
    uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
    uriMatcher.addURI(PROVIDER_NAME, "fixtures", fixture);
}


FixturesDB mDB;


@Override
public boolean onCreate() {
    mDB = new FixturesDB(getContext());
    return true;
}

@Override
public String getType(Uri uri) {
    return null;
}


@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {

    if(uriMatcher.match(uri)==fixture){
        return mDB.getFixtures();
    }else{
        return null;
    }
}

@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public Uri insert(Uri uri, ContentValues values) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public int update(Uri uri, ContentValues values, String selection,
        String[] selectionArgs) {
    // TODO Auto-generated method stub
    return 0;
}

}

和Fixtures类：

public class Fixtures extends FragmentActivity implements LoaderCallbacks<Cursor> {

SimpleCursorAdapter mAdapter;
ListView listView;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.setContentView(R.layout.activity_fixtures);
    listView = (ListView) findViewById(R.id.listview);      
    mAdapter = new SimpleCursorAdapter(getBaseContext(),  R.layout.listview_fixtures_layout, null,
            new String[] {FixturesDB.KEY_DATE, FixturesDB.KEY_TEAM, FixturesDB.KEY_COMPETITION},
            new int[] {R.id.date, R.id.team, R.id.competition}, 0);
    listView.destroyDrawingCache();
    listView.setVisibility(ListView.INVISIBLE);
    listView.setVisibility(ListView.VISIBLE);
    listView.setAdapter(mAdapter);
    /**
     * This creates a loader to populate the list view from the sqlite database
     */
    getSupportLoaderManager().initLoader(0, null, this);        
}


@Override
public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {
    Uri uri = FixtureContentProvider.CONTENT_URI;
    return new CursorLoader(this, uri, null, null, null, null);
}

@Override
public void onLoadFinished(Loader<Cursor> arg0, Cursor arg1) {
    mAdapter.swapCursor(arg1);
}

@Override
public void onLoaderReset(Loader<Cursor> arg0) {
    mAdapter.swapCursor(null);
}

}

我假设我必须刷新或关闭数据库然后重新打开或类似的东西？

提前致谢。

修改 我只需卸载应用程序并将其重新安装到设备上即可回答我自己的问题。

Noob时刻。

1 个答案:

答案 0 :(得分：0)

根据内容提供程序的存根实现来判断，您似乎必须假设如果为SQLiteOpenHelper的onCreate方法添加更多插入语句，新行将显示在fixtures表中。

事实并非如此。

原因是onCreate仅在首次创建数据库时调用一次（文件系统上没有数据库文件存在。）

要解决此问题以进行测试，您可以删除通常位于/data/your.package.name/databases中的数据库文件，然后重新运行您的应用。

或者

使用ContentResolver或ContentProviderClient完成实现内容提供程序并从某些客户端代码执行insert语句。

或者

使用adb shell并使用sqlite3工具将行插入数据库。

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