Question

我正在开发Android中与计费相关的APP。我有一个数据库，其中有4列：

ITEMNAME
PRICE
STOCK
ID

ID列处于自动递增状态

在我的主要活动中，我使用具有5列的表布局，其中我对2列有问题。第二列是ITEMNAME，第三列是PRICE。

在ITEMNAME列上，我使用与数据库链接的自动完成TextView。每当我在自动完成TextView中输入商品名称时，我都希望自动在“价格列”中获取价格

这是我向自动完成TextView添加数据的方法：

 public void preparedata2() {

        list = new ArrayList<String>();
        Cursor res1 = mydb.getAllData1();
        if (res1.getCount() == 0) {
            Toast.makeText(this, "No data in the database", Toast.LENGTH_SHORT).show();
        } else {
            while (res1.moveToNext()) {
                list.add(res1.getString(1));

                adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);


            }

这是我的动态布局代码：

public void onClick(View view) {
    tr1 = new TableRow(this);


    et6 = new EditText(this);
    et6.setText("");
    et7 = new AutoCompleteTextView(this);
    et7.setAdapter(adapter);
    et7.setThreshold(1);
    et7.setText("");
    et7.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            try {
                {
                   """" HERE I WANT HELP""""



                }



            } catch (Exception e) {
                Toast.makeText(shopp.this, "Something went wrong 1", Toast.LENGTH_SHORT).show();
            }
            ;
        }
                               });
    et8 = new EditText(this);
    et9 = new EditText(this);
    et10 = new EditText(this);
    et8.setText("");
    et9.setText("");
    et10.setText("");
    et6.setBackgroundResource(R.drawable.edittext3);
    et6.setGravity(Gravity.CENTER);
    et6.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
    et7.setBackgroundResource(R.drawable.edittext3);
    et7.setGravity(Gravity.CENTER);
    et7.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
    et8.setBackgroundResource(R.drawable.edittext3);
    et8.setGravity(Gravity.CENTER);
    et8.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
    et9.setBackgroundResource(R.drawable.edittext3);
    et9.setGravity(Gravity.CENTER);
    et9.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
    et10.setBackgroundResource(R.drawable.edittext3);
    et10.setGravity(Gravity.CENTER);
    et10.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
    tr1.addView(et6);
    tr1.addView(et7);
    tr1.addView(et8);
    tr1.addView(et9);
    tr1.addView(et10);
    t1.addView(tr1);

这是我的SQLite数据检索方法：

public Cursor getAllData1() {
    SQLiteDatabase db = this.getWritableDatabase();
    Cursor res1 = db.rawQuery("select * from " + Tname, null);
    return res1;
}

Answer 1

尝试此代码。

public List<MyTableTwo> getMyItems() {
    List<MyTableTwo> mySuperList = new ArrayList<>();
    SQLiteDatabase db = this.getReadableDatabase();
    String selectQuery = "SELECT  * FROM " + USER_TABLE_NAME;
    Cursor c = db.rawQuery(selectQuery, null);
    if (c != null) {
        c.moveToFirst();
        while (c.isAfterLast() == false) {
            MyTableTwo myTable = new MyTableTwo();
            myTable.itemName = (c.getString(c.getColumnIndex("Item_Name")));
            myTable.weight = (c.getString(c.getColumnIndex("Weight")));
            myTable.mrp = (c.getString(c.getColumnIndex("MRP")));
            myTable.barcod = (c.getString(c.getColumnIndex("BARCODE")));

            mySuperList.add(myTable);
            c.moveToNext();
        }
    }
    return mySuperList;
}

Answer 2

Use This Code

public ArrayList<GIF> getGIFName() {
        dbHelper.getWritableDatabase();
        ArrayList<GIF> gifList = new ArrayList();
        String selectQuery = " SELECT * FROM gif_detail ";
        Cursor cursor = database.rawQuery(selectQuery, null);
        if (cursor.getCount() > 0) {
            for (int i = 0; i < cursor.getCount(); i++) {
                cursor.moveToNext();
                gifList.add(new GIF(cursor.getString(1), false));
            }
        }
        cursor.close();
        Log.d("TotalGIF File =", gifList.size() + "");
        return gifList;
    }

从SQLite检索数据时出现问题

2 个答案: