androidstudio 类似excel

如果你想要在 Android Studio 中实现类似 Excel 的功能，你可以考虑使用 RecyclerView 和自定义 Adapter 来创建一个类似表格的布局。

以下是一个简单的实现方法：

1. 在 activity_main.xml 文件中，添加一个 RecyclerView 标签。

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

2. 创建一个自定义的 RecyclerView.Adapter 类，用于管理表格数据。

public class TableAdapter extends RecyclerView.Adapter<TableAdapter.ViewHolder> {

    private String[][] mData;

    public TableAdapter(String[][] data) {
        mData = data;
    }

    public void setData(String[][] data) {
        mData = data;
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_table_cell, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        int row = position / mData[0].length;
        int col = position % mData[0].length;
        holder.mTextView.setText(mData[row][col]);
    }

    @Override
    public int getItemCount() {
        return mData.length * mData[0].length;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {

        public TextView mTextView;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            mTextView = itemView.findViewById(R.id.textView);
        }
    }
}

3. 创建一个单元格布局 item_table_cell.xml，用于显示表格中的每个单元格。

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="8dp"
    android:textSize="16sp"
    android:background="@drawable/cell_border" />

4. 创建一个自定义的 ItemDecoration 类，用于设置单元格之间的边框。

public class CellDecoration extends RecyclerView.ItemDecoration {

    private Drawable mDivider;

    public CellDecoration(Context context) {
        mDivider = ContextCompat.getDrawable(context, R.drawable.cell_divider);
    }

    @Override
    public void onDraw(@NonNull Canvas c, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
        int childCount = parent.getChildCount();
        int columnCount = ((TableLayoutManager) parent.getLayoutManager()).getColumnCount();
        int rowCount = (childCount + columnCount - 1) / columnCount;
        for (int i = 0; i < childCount; i++) {
            View child = parent.getChildAt(i);
            int row = i / columnCount;
            int col = i % columnCount;
            int left = child.getLeft();
            int top = child.getTop();
            int right = child.getRight();
            int bottom = child.getBottom();
            if (col > 0) drawVerticalDivider(c, left, top, bottom);
            if (row > 0) drawHorizontalDivider(c, top, left, right);
        }
        for (int i = 1; i < columnCount; i++) {
            int x = parent.getChildAt(i).getLeft();
            int y1 = parent.getChildAt(i - 1).getTop();
            int y2 = parent.getChildAt(childCount - columnCount + i - 1).getBottom();
            drawVerticalDivider(c, x, y1, y2);
        }
        for (int i = 1; i < rowCount; i++) {
            int y = parent.getChildAt(i * columnCount).getTop();
            int x1 = parent.getChildAt((i - 1) * columnCount).getLeft();
            int x2 = parent.getChildAt(i * columnCount - 1).getRight();
            drawHorizontalDivider(c, y, x1, x2);
        }
    }

    private void drawVerticalDivider(Canvas c, int x, int y1, int y2) {
        mDivider.setBounds(x - mDivider.getIntrinsicWidth(), y1, x, y2);
        mDivider.draw(c);
    }

    private void drawHorizontalDivider(Canvas c, int y, int x1, int x2) {
        mDivider.setBounds(x1, y - mDivider.getIntrinsicHeight(), x2, y);
        mDivider.draw(c);
    }
}

5. 创建一个自定义的 LayoutManager 类，用于设置表格布局。

public class TableLayoutManager extends LinearLayoutManager {

    private int mColumnCount;

    public TableLayoutManager(Context context, int columnCount) {
        super(context);
        mColumnCount = columnCount;
    }

    @Override
    public int getOrientation() {
        return HORIZONTAL;
    }

    @Override
    public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
        super.onLayoutChildren(recycler, state);
        int width = getWidth() - getPaddingLeft() - getPaddingRight();
        int height = getHeight() - getPaddingTop() - getPaddingBottom();
        int cellWidth = width / mColumnCount;
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            int row = i / mColumnCount;
            int col = i % mColumnCount;
            int left = col * cellWidth + getPaddingLeft();
            int top = row * child.getMeasuredHeight() + getPaddingTop();
            int right = left + cellWidth;
            int bottom = top + child.getMeasuredHeight();
            child.layout(left, top, right, bottom);
        }
    }

    public int getColumnCount() {
        return mColumnCount;
    }
}

6. 在 MainActivity 中，初始化 RecyclerView 和 Adapter，并设置 LayoutManager 和 ItemDecoration。

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private TableAdapter mAdapter;

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

        mRecyclerView = findViewById(R.id.recyclerView);
        mAdapter = new TableAdapter(new String[][]{
                {"A1", "B1", "C1"},
                {"A2", "B2", "C2"},
                {"A3", "B3", "C3"},
                {"A4", "B4", "C4"},
        });
        mRecyclerView.setAdapter(mAdapter);
        mRecyclerView.setLayoutManager(new TableLayoutManager(this, 3));
        mRecyclerView.addItemDecoration(new CellDecoration(this));
    }
}

运行代码后，你会得到一个类似下面的表格布局：

| A1 | B1 | C1 |
|----|----|----|
| A2 | B2 | C2 |
| A3 | B3 | C3 |
| A4 | B4 | C4 |

请注意，这只是一个简单的实现方法，你可以根据自己的需求进行修改和优化。