Android:如何自动在ListView中显示带有复选框的SQLite数据库
创始人
2024-10-13 18:00:47
0

以下是一个示例代码,展示了如何在Android中自动在ListView中显示带有复选框的SQLite数据库:

  1. 创建一个布局文件 activity_main.xml,包含一个ListView组件:


    


  1. 创建一个布局文件 list_item.xml,定义每个ListView项的布局,包含一个复选框和一个文本视图:


    

    


  1. 创建一个数据库助手类 DatabaseHelper.java,用于处理SQLite数据库的创建和查询逻辑:
public class DatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "mydatabase.db";
    private static final int DATABASE_VERSION = 1;

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTable = "CREATE TABLE items (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT)";
        db.execSQL(createTable);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        String dropTable = "DROP TABLE IF EXISTS items";
        db.execSQL(dropTable);
        onCreate(db);
    }

    public void insertItem(String item) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put("name", item);
        db.insert("items", null, values);
        db.close();
    }

    public List getAllItems() {
        List itemList = new ArrayList<>();
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery("SELECT * FROM items", null);
        if (cursor.moveToFirst()) {
            do {
                String item = cursor.getString(cursor.getColumnIndex("name"));
                itemList.add(item);
            } while (cursor.moveToNext());
        }
        cursor.close();
        db.close();
        return itemList;
    }
}
  1. 在MainActivity中,使用数据库助手类和自定义适配器类来显示带有复选框的SQLite数据库:
public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private DatabaseHelper databaseHelper;
    private List itemList;
    private ArrayAdapter adapter;

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

        listView = findViewById(R.id.listView);
        databaseHelper = new DatabaseHelper(this);
        itemList = databaseHelper.getAllItems();
        adapter = new MyAdapter(this, R.layout.list_item, itemList);
        listView.setAdapter(adapter);
    }

    private class MyAdapter extends ArrayAdapter {
        private List itemList;
        private LayoutInflater inflater;

        public MyAdapter(@NonNull Context context, int resource, @NonNull List objects) {
            super(context, resource, objects);
            itemList = objects;
            inflater = LayoutInflater.from(context);
        }

        @NonNull
        @Override
        public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {
            ViewHolder holder;
            if (convertView == null) {
                convertView = inflater.inflate(R.layout.list_item, parent, false);
                holder = new ViewHolder();
                holder.checkbox = convertView.findViewById(R.id.checkbox);
                holder.textview = convertView.findViewById(R.id.textview);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            holder.textview.setText(itemList.get(position));
            holder.checkbox.setChecked(false);
            holder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onChecked

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