如何從DataBase中填充自定義的ListView項目

Question

我剛開始學習Android中的編程。 我有一個問題。如何創建自定義適配器來填充自定義ListView項目。

ListView項代碼：

item.xml

<RelativeLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" > 

    <TextView 
     android:id="@+id/titleView" 
     ... /> 

    <TextView 
     android:id="@+id/dateView" 
     ... /> 

</RelativeLayout> 

數據庫助手：

public class DataBase { 
    public static final String DB_NAME = "appdb"; 
     public static final int DB_VERSION = 1; 
     static final String TABLE_NAME = "passtab"; 
     final String LOG_TAG = "myLogs"; 
     public static final String COLUMN_ID = "_id"; 
     public static final String COLUMN_TITLE = "title_enter"; 
     public static final String COLUMN_LOGIN = "login_enter"; 
     public static final String COLUMN_PASSWORD = "password_enter"; 
     public static final String COLUMN_URL = "link_enter"; 
     public static final String COLUMN_COMMENT = "comment_enter"; 
     public static final String COLUMN_DATE = "date_enter"; 
     public String results; 
     private DBHelper phdb; 
     private static Context pcontext; 
     private SQLiteDatabase pdb; 

     private static final String DB_CREATE = 
     "create table " + TABLE_NAME + "(" + 
       COLUMN_ID + " integer primary key autoincrement, " + 
      COLUMN_TITLE + " VARCHAR(255), " + 
      COLUMN_LOGIN + " VARCHAR(255), " + 
      COLUMN_PASSWORD + " VARCHAR(255), " + 
       COLUMN_URL + " VARCHAR(255), " + 
       COLUMN_COMMENT + " text, " + 
       COLUMN_DATE + " VARCHAR(255)" + 
       ");"; 
public class DBHelper extends SQLiteOpenHelper{ 
     public DBHelper(Context context) { 
       super(context, DB_NAME, null, DB_VERSION); 
       } 
@Override 
public void onCreate(SQLiteDatabase sqLiteDatabase) { 
     sqLiteDatabase.execSQL(DB_CREATE); 
     } 
@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     }  

} 
public DataBase(Context c) { 
    pcontext = c; 
} 
public DataBase open() throws SQLiteException { 
    phdb = new DBHelper(pcontext); 
    pdb = phdb.getWritableDatabase(); 
    return this; 
} 
public SQLiteDatabase getDatabase() { 
    return pdb; 
} 
public void close() { 
    pdb.close(); 
} 
... 
public List<String> getData() { 
    String[] columns = new String[] { COLUMN_TITLE }; 
    Cursor c = pdb.query(TABLE_NAME, columns, null, null, null, null, 
      null); 

    List<String> results = new ArrayList<String>(); 
    int iCM = c.getColumnIndex(COLUMN_TITLE); 

    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { 
     results.add(c.getString(iCM)); 
    } 
    return results; 
}} 

MainActivity：

public class MainScreen extends FragmentActivity implements OnClickListener { 

    ListView listViewMain; 
    SQLiteDatabase db; 
    DataBase DB; 
    DBHelper dbH; 
    Cursor cursor; 

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

... 

listViewMain = (ListView) findViewById(R.id.listViewMain); 

DBHelper dbc = new DBHelper(MainScreen.this); 
dbc.open(); 

String[] cs = new String[] { DataBase.COLUMN_TITLE }; 

Log.d(LOG_TAG, cs.toString()); 

listViewMain.setAdapter(new MySimpleAdapter<String>(this, 
android.R.layout.item, cs)); 

dbc.close(); 
} 

    public class MySimpleAdapter extends SimpleAdapter { 

public MySimpleAdapter(Context context, 
List<? extends Map<String, ?>> data, int resource, 
String[] from, int[] to) { 
super(context, data, resource, from, to); 
    } 

如何編寫適配器並將其用於ListView？

Answer 1

onCreate方法：

List<String> results = DBHelper.getData(); 
listViewMain = (ListView) findViewById(R.id.listViewMain); 
ArrayAdapter adapter = new ArrayAdapter(this, 
       android.R.layout.simple_list_item_1, results); 
listViewMain.setListAdapter(adapter);