当 SimpleCursorAdapter 将值从表添加到 listView 时检查列值

Posted 2023-04-18

【中文标题】当 SimpleCursorAdapter 将值从表添加到 listView 时检查列值

【英文标题】：Checking column value when SimpleCursorAdapter is adding values from table to listView

【发布时间】：2020-08-25 23:50:23

【问题描述】：

在我的表中，我有列名"FAVOURITE"，其值为 0 或 1（假/真）。当我将表中的值添加到listView 时，我想检查FAVOURITE 列中的值，如果值为1，则添加心形表情符号，如果值为0，则添加空格。我正在使用SimpleCursorAdapter将我的数据添加到列表视图。

这是我向listView 添加值的片段：

cursor = db.query("SERIAL",new String[]"_id","NAME","SERVICE","SEASON", "CURRENT_EPISODE", "EPISODES", "FAVOURITE",null,null,null,null,null);
if(cursor.moveToFirst())

    SimpleCursorAdapter listAdapter = new SimpleCursorAdapter(this, R.layout.my_custom_list,
            cursor,
            new String[]"NAME","SERVICE","SEASON", "CURRENT_EPISODE", "EPISODES", "FAVOURITE", //"Ulubione" mean "Favourite"
            new int[]R.id.textNazwa,R.id.textSerwis,R.id.Sezon,R.id.aktualnyOdcinek,R.id.iloscOdcinkow, R.id.Ulubione,
            0);
    listViewSeriale.setAdapter(listAdapter);

以及该类的完整代码：

public class BazaDanych extends AppCompatActivity 
    private ProjektSQLiteOpenHelper bazaDanych;
    private SQLiteDatabase db;
    private Cursor cursor;
    private ListView listViewSeriale;

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

        listViewSeriale = (ListView) findViewById(R.id.listViewSeriale);
        try 
            bazaDanych = new ProjektSQLiteOpenHelper(this);
            db = bazaDanych.getWritableDatabase();
         catch (SQLException e) 
            Toast toast = Toast.makeText(this, "Baza danych niedostępna", Toast.LENGTH_LONG);
            toast.show();
            finish();
        

        AdapterView.OnItemClickListener itemClickListener = new AdapterView.OnItemClickListener() 
            @Override
            public void onItemClick(AdapterView<?> listViewOrganizacje, View view, int position, long id) 
                Intent intent = new Intent(BazaDanych.this, BazaDanychAktualizacja.class);
                intent.putExtra(BazaDanychAktualizacja.EXTRA_ORGANIZACJA_ID, (int) id);
                startActivity(intent);
            
        ;
        listViewSeriale.setOnItemClickListener(itemClickListener);

        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                Intent intent = new Intent(BazaDanych.this, BazaDanychDopisz.class);
                startActivity(intent);
            
        );
    

    @Override
    public void onResume() 
        super.onResume();
        cursor = db.query("SERIAL", new String[]"_id", "NAME", "SERVICE", "SEASON", "CURRENT_EPISODE", "EPISODES", "FAVOURITE", null, null, null, null, null);
        if (cursor.moveToFirst()) 
            SimpleCursorAdapter listAdapter = new SimpleCursorAdapter(this, R.layout.my_custom_list,
                    cursor,
                    new String[]"NAME", "SERVICE", "SEASON", "CURRENT_EPISODE", "EPISODES", "FAVOURITE",
                    new int[]R.id.textNazwa, R.id.textSerwis, R.id.Sezon, R.id.aktualnyOdcinek, R.id.iloscOdcinkow, R.id.Ulubione, //"Ulubione" mean "Favourite"
                    0);
            listViewSeriale.setAdapter(listAdapter);
        
    

    public void odejmijOdcinekZListy(View view) 
        TextView serwTest = findViewById(R.id.textSerwis);
        Toast toast = Toast.makeText(this, "Odejmij odcinek" + serwTest.getText(), Toast.LENGTH_LONG);
        toast.show();
    

也许我应该在创建列表视图后阅读列并通过findViewById(R.id.Ulubione).getText and .setText 检查所有元素，但我如何使用listView 做到这一点？ 撞

【参考方案1】：

我偶然在这篇帖子***找到了解决方案

我的onResume() 方法：

@Override
public void onResume() 
    super.onResume();
    cursor = db.query("SERIAL", new String[]"_id", "NAME", "SERVICE", "SEASON", "CURRENT_EPISODE", "EPISODES", "FAVOURITE", null, null, null, null, null);
    if (cursor.moveToFirst()) 
        SimpleCursorAdapter listAdapter = new SimpleCursorAdapter(this, R.layout.my_custom_list,
                cursor,
                new String[]"NAME", "SERVICE", "SEASON", "CURRENT_EPISODE", "EPISODES", "FAVOURITE",
                new int[]R.id.textNazwa, R.id.textSerwis, R.id.Sezon, R.id.aktualnyOdcinek, R.id.iloscOdcinkow, R.id.Ulubione, //"Ulubione" mean "Favourite"
                0) 

            // XDDDDD
            @Override
            public View getView(int position, View convertView, ViewGroup parent) 
                View v = super.getView(position, convertView, parent);
                TextView tx = (TextView) v.findViewById(R.id.Ulubione);
                if (Integer.parseInt(tx.getText().toString()) == 1)
                    tx.setText("❤️");
                else
                    tx.setText("♡");
                return v;
            
        ;
        listViewSeriale.setAdapter(listAdapter);