在listview和gridview之间切换视图类型，并将数据保存在Android中

// MainActivity.java

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private GridView gridView;
    private Button switchButton;
    private boolean isListView = true;
    private List<DataItem> dataItems;
    private DataAdapter adapter;

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

        listView = findViewById(R.id.listView);
        gridView = findViewById(R.id.gridView);
        switchButton = findViewById(R.id.switchButton);

        // 初始化数据
        dataItems = initData();

        // 初始化适配器
        adapter = new DataAdapter(dataItems, isListView);

        // 设置适配器给ListView或GridView
        if (isListView) {
            listView.setAdapter(adapter);
            listView.setVisibility(View.VISIBLE);
            gridView.setVisibility(View.GONE);
        } else {
            gridView.setAdapter(adapter);
            gridView.setVisibility(View.VISIBLE);
            listView.setVisibility(View.GONE);
        }

        // 切换视图类型按钮点击事件
        switchButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                isListView = !isListView;

                // 切换视图类型并更新适配器
                if (isListView) {
                    listView.setAdapter(adapter);
                    listView.setVisibility(View.VISIBLE);
                    gridView.setVisibility(View.GONE);
                } else {
                    gridView.setAdapter(adapter);
                    gridView.setVisibility(View.VISIBLE);
                    listView.setVisibility(View.GONE);
                }
            }
        });
    }

    // 初始化数据
    private List<DataItem> initData() {
        List<DataItem> dataItems = new ArrayList<>();
        // 添加数据项
        // ...

        return dataItems;
    }
}

// DataAdapter.java

public class DataAdapter extends BaseAdapter {
    private List<DataItem> dataItems;
    private boolean isListView;

    public DataAdapter(List<DataItem> dataItems, boolean isListView) {
        this.dataItems = dataItems;
        this.isListView = isListView;
    }

    @Override
    public int getCount() {
        return dataItems.size();
    }

    @Override
    public Object getItem(int position) {
        return dataItems.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;

        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(parent.getContext());

            if (isListView) {
                convertView = inflater.inflate(R.layout.list_item, parent, false);
            } else {
                convertView = inflater.inflate(R.layout.grid_item, parent, false);
            }

            viewHolder = new ViewHolder();
            viewHolder.textView = convertView.findViewById(R.id.textView);
            // 其他视图组件的初始化
            // ...

            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        DataItem dataItem = dataItems.get(position);

        viewHolder.textView.setText(dataItem.getText());
        // 其他视图组件的数据绑定
        // ...

        return convertView;
    }

    private static class ViewHolder {
        TextView textView;
        // 其他视图组件的引用
        // ...
    }
}