我的项目是游戏列表。 在我的列表视图的每一行中，我有两个按钮：一个用于下载游戏，另一个用于将游戏添加到收藏夹列表中。
当应用程序启动时，我从json获取所有数据并将数据库中的所有fav列设置为0，如下所示：
for (int i = 0; i < res.size(); i++) {
jsonObject = new JSONObject(res.get(i)); //get all the jsons
//get all the data to store in database
name_array.add(jsonObject.getString("PersianTitle"));
des_array.add(jsonObject.getString("Description"));
roms_array.add(jsonObject.getString("downloadlink"));
icon_array.add(jsonObject.getString("icon"));
fav_array.add("0");
//set data in adapter to show in listview
adapter = new MyBaseAdapter(FileChooser.this, name_array,
des_array, icon_array, roms_array);
listView.setAdapter(adapter);
}
//store dada in database (name , des , icon , bin file(roms) , state)
database.insertData(name_array, des_array, icon_array, roms_array, fav_array);
我像这样保存到数据库：
database.insertData(name_array, des_array, icon_array, roms_array, fav_array);
现在，我想将游戏添加到收藏列表中，所以我这样做了：
if (fav_array.get(position).equals("1")) {
fav.setImageResource(R.drawable.fav_on);
} else {
fav.setImageResource(R.drawable.fav_off);
}
fav.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (fav_array.get(position).equals("1")) {
database.insertData1(fav_array.set(position, "0"));
Log.i("MHS", name_array.get(position) + des_array.get(position)
+ icon_array.get(position) + roms_array.get(position)
+ fav_array.set(position, "0") + "");
fav.setImageResource(R.drawable.fav_off);
fav_array.set(position, "0");
} else {
database.insertData1(fav_array.set(position, "1"));
Log.i("MHS22", name_array.get(position) + des_array.get(position)
+ icon_array.get(position) + roms_array.get(position)
+ fav_array.set(position, "1") + "");
fav.setImageResource(R.drawable.fav_on);
fav_array.set(position, "1");
}
通过这种方法，我将fav_array的值更改为用户选择的位置。
public void insertData1(String fav) {
sqLiteDatabase = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("dl", fav);
sqLiteDatabase.insert("emp", null, values);
}
我的值已正确更改，但当我关闭应用程序并再次打开它时，未选择之前为收藏夹列表选择的位置。 我想我无法更新我的数据库，这就是为什么它就像我第一次运行时那样。
当我打开应用程序时，我从数据库中获取了这样的值：
for (int i = 0; i < game_counter_store; i++) {
name_array = database.Game_Info(i, 0);
des_array = database.Game_Info(i, 1);
icon_array = database.Game_Info(i, 2);
roms_array = database.Game_Info(i, 3);
fav_array = database.Game_Info(i, 4);
}
adapter = new MyBaseAdapter(FileChooser.this, name_array, des_array,
icon_array, roms_array);
listView.setAdapter(adapter);
这是我的整个数据库代码：
public class DatabaseHandler extends SQLiteOpenHelper {
public SQLiteDatabase sqLiteDatabase;
int tedad;
public static final String Name="EmployeeDatabase.db";
public static String path;
public DatabaseHandler(Context context) {
super(context, "EmployeeDatabase.db", null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
String tableEmp = "create table emp(PersianTitle text,Description text,icon text,downloadlink text,dl integer)";
db.execSQL(tableEmp);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void open(){
sqLiteDatabase=SQLiteDatabase.openDatabase(path+Name, null, SQLiteDatabase.OPEN_READWRITE);
}
public void close(){
sqLiteDatabase.close();
}
public void insertData(ArrayList<String> text, ArrayList<String> des, ArrayList<String> icon, ArrayList<String> roms,ArrayList<String> fav) {
int size = text.size();
tedad = size;
sqLiteDatabase = this.getWritableDatabase();
try {
for (int i = 0; i < size; i++) {
ContentValues values = new ContentValues();
values.put("PersianTitle", text.get(i));
values.put("Description", des.get(i));
values.put("icon", icon.get(i));
values.put("downloadlink", roms.get(i));
values.put("dl", fav.get(i));
sqLiteDatabase.insert("emp", null, values);
}
} catch (Exception e) {
Log.e("Problem", e + " ");
}
}
public void insertData1(String fav) {
sqLiteDatabase = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("dl", fav);
sqLiteDatabase.insert("emp", null, values);
}
public ArrayList<String> Game_Info (int row, int field) {
String fetchdata = "select * from emp";
SQLiteDatabase sqLiteDatabase = this.getReadableDatabase();
ArrayList<String> stringArrayList = new ArrayList<String>();
Cursor cu = sqLiteDatabase.rawQuery(fetchdata, null);
for (int i = 0; i < row + 1; i++) {
cu.moveToPosition(i);
String s = cu.getString(field);
stringArrayList.add(s);
}
return stringArrayList;
}
}