我的游戏结果有这个数据库，我希望它按时间降序排序，但在左边我不想像图片中那样，我想从 1 到 20。怎么做？我将所有这些数据放在我的 xml 文件中的 TextView 中。
这是我的数据库类：
public class OffDBHelper {
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "name";
public static final String KEY_SCORE = "score";
private static final String DATABASE_NAME = "highscores";
private static final String DATABASE_TABLE = "highscorestable";
public static final int DATABASE_VERSION = 1;
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DbHelper extends SQLiteOpenHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
KEY_NAME + " TEXT NOT NULL, " +
KEY_SCORE + " DOUBLE NOT NULL);"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
onCreate(db);
}
}
public OffDBHelper(Context c){
ourContext = c;
}
public OffDBHelper open() throws Exception{
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close(){
ourHelper.close();
}
public long createEntry(String name, double score) {
ContentValues cv = new ContentValues();
cv.put(KEY_NAME, name);
cv.put(KEY_SCORE, score);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public String getData() {
String[] columns = new String[]{KEY_ROWID, KEY_NAME, KEY_SCORE};
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, "score DESC");
String result = "";
int iRow = c.getColumnIndex(KEY_ROWID);
int iName = c.getColumnIndex(KEY_NAME);
int iScore = c.getColumnIndex(KEY_SCORE);
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
result = result + c.getString(iRow) + " " + c.getString(iName) + " " + c.getString(iScore) + "\n";
}
return result;
}
}
还有我的数据管理课：
TextView tv = (TextView) findViewById(R.id.tvSQLinfo);
OffDBHelper info = new OffDBHelper(this);
try {
info.open();
} catch (Exception e) {
e.printStackTrace();
}
String data = info.getData();
info.close();
tv.setText(data);