在编辑模式下预览，可以看出修改不同属性产生的变化

属性表

attr	meaning	defaultValue	备注
tableRowHeight	单元格的高度	36dp
tableDividerSize	分割线大小	1px
tableDividerColor	分割线颜色	Color.GRAY
tableColumnPadding	单元格左右padding	0
tableTextGravity	单元格对齐方式	center	可选center/leftCenter/rightCenter
tableTextSize	字体大小	12dp
tableTextColor	文字颜色	Color.GRAY
tableTextColorSelected	选中后文字颜色	Color.BLACK
backgroundColorSelected	单元格选中后的背景色	Color.TRANSPARENT

使用方法

在GitHub上检出此项目，将tableLayout这个library module导入到项目中，并在application module中添加对tableLayout的依赖

dependencies {
    compile project(':tableLayout')
}

在xml中定义表格基础样式

    <win.smartown.android.library.tableLayout.TableLayout
        android:id="@+id/main_table"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@android:color/white"
        app:backgroundColorSelected="@color/colorAccent"
        app:tableColumnPadding="32dp"
        app:tableDividerColor="#ddd"
        app:tableDividerSize="1px"
        app:tableRowHeight="48dp"
        app:tableTextColor="#333"
        app:tableTextColorSelected="#fff"
        app:tableTextSize="14dp" />

在Java代码中填充展示数据

        TableLayout tableLayout = (TableLayout) findViewById(R.id.main_table);

        contentList = new ArrayList<>();
        contentList.add(new Content("姓名", "语文", "数学", "英语", "物理", "化学", "生物"));
        contentList.add(new Content("张三", newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber()));
        contentList.add(new Content("李四", newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber()));
        contentList.add(new Content("王二", newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber()));
        contentList.add(new Content("王尼玛", newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber()));
        contentList.add(new Content("张全蛋", newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber()));
        contentList.add(new Content("赵铁柱", newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber(), newRandomNumber()));

        tableLayout.setAdapter(new TableAdapter() {
            @Override
            public int getColumnCount() {
                return contentList.size();
            }

            @Override
            public String[] getColumnContent(int position) {
                return contentList.get(position).toArray();
            }
        });

现在运行就可以看到下图的效果了

部分源码分析

这里由内而外的分析，从基础的单元开始。

win.smartown.android.library.tableLayout.TableColumn 这个类表示表格中的一列，比较关键的点在于根据填充到此列的数据来确定此列的宽度

1.根据填充内容确定一个单元格（TextView）显示这些文本要占用的宽度：

  // 计算出该TextView中文字的长度(像素)
  public static float measureTextViewWidth(TextView textView, String text) {
      // 得到使用该paint写上text的时候,像素为多少
      return textView.getPaint().measureText(text);
  }

2.遍历此列中所有的单元格，得到最大单元格的宽度maxTextViewWidth ，将其作为此列的宽度

  private void initContent() {
      int padding = callback.getTableLayout().getTableColumnPadding();
      maxTextViewWidth = 0;
      ArrayList<TextView> textViews = new ArrayList<>();
      for (String text : content) {
          TextView textView = new TextView(getContext());
          textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, callback.getTableLayout().getTableTextSize());
          textView.setTextColor(callback.getTableLayout().getTableTextColor());
          maxTextViewWidth = Math.max(maxTextViewWidth, Util.measureTextViewWidth(textView, text));
          textView.setGravity(getTextGravity(callback.getTableLayout().getTableTextGravity()));
          textView.setPadding(padding, 0, padding, 0);
          textView.setText(text);
          textViews.add(textView);
      }
      LayoutParams layoutParams = new LayoutParams((int) (padding * 2 + maxTextViewWidth), callback.getTableLayout().getTableRowHeight());
      for (TextView textView : textViews) {
          addView(textView, layoutParams);
      }
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
      super.onMeasure(widthMeasureSpec, heightMeasureSpec);
      setMeasuredDimension((int) (callback.getTableLayout().getTableColumnPadding() * 2 + maxTextViewWidth), callback.getTableLayout().getTableRowHeight() * getChildCount());
  }

win.smartown.android.library.tableLayout.TableLayout TableLayout就是最终呈现的完整表格，实际上他就是多个TableColumn的组合，其主要负责整个表格的大小测量、分割线绘制和接受数据填充。 1.单元格大小测量

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
      super.onMeasure(widthMeasureSpec, heightMeasureSpec);
      int width = 0;
      int height = 0;
      int childCount = getChildCount();
      for (int i = 0; i < childCount; i++) {
          View child = getChildAt(i);
          width += child.getMeasuredWidth();
          height = Math.max(height, child.getMeasuredHeight());
      }
      setMeasuredDimension(width, height);
  }

2.绘制分割线

在ViewGroup要重写onDraw()，需要设置setWillNotDraw(false)，否者onDown()中的绘制不会生效，具体的分割线绘制参见TableLayout源码的onDraw()；

3.数据的填充

  public void setAdapter(TableAdapter adapter) {
      this.adapter = adapter;
      useAdapter();
  }
  
  //设置adapter后，先清空原来的数据，然后根据新数据添加TableColumn
  private void useAdapter() {
      removeAllViews();
      int count = adapter.getColumnCount();
      for (int i = 0; i < count; i++) {
          addView(new TableColumn(getContext(), adapter.getColumnContent(i), this));
      }
  }

win.smartown.android.library.tableLayout.FreeScrollView 顾名思义，此类用来实现子View的自用滚动，当子view大小超过FreeScrollView的大小，就可以拖动显示超出的内容 1.处理滚动

          @Override from GestureDetector （重写GestureDetector 的onScroll()）
          public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
              View view = getChildAt(0);
              int childHeight = view.getHeight();
              int childWidth = view.getWidth();
              int toX, toY;
              if (distanceX > 0) {
                  if (childWidth > getWidth()) {
                      if (getScrollX() + getWidth() >= childWidth) {
                          toX = childWidth - getWidth();
                      } else {
                          toX = (int) (getScrollX() + distanceX);
                      }
                  } else {
                      toX = 0;
                  }
              } else {
                  if (getScrollX() + distanceX < 0) {
                      toX = 0;
                  } else {
                      toX = (int) (getScrollX() + distanceX);
                  }
              }
              if (distanceY > 0) {
                  if (childHeight > getHeight()) {
                      if (getScrollY() + getHeight() >= childHeight) {
                          toY = childHeight - getHeight();
                      } else {
                          toY = (int) (getScrollY() + distanceY);
                      }
                  } else {
                      toY = 0;
                  }
              } else {
                  if (getScrollY() + distanceY < 0) {
                      toY = 0;
                  } else {
                      toY = (int) (getScrollY() + distanceY);
                  }
              }
              scrollTo(toX, toY);
              return false;
          }

2.处理点击事件，达到选中效果

          //由于FreeScrollView拦截了TouchEvent，所以要在FreeScrollView处理点击事件，
          //通过计算坐标来定位点击的是哪个单元格，点击处理顺序：
          //FreeScrollView.onSingleTapUp() -> TableLayout.onClick()  -> TableLayout.onClick() -> TableColumn.onClick()
          @Override from GestureDetector 
          public boolean onSingleTapUp(MotionEvent e) {
              View view = getChildAt(0);
              if (view instanceof TableLayout) {
                  ((TableLayout) view).onClick(e.getX() + getScrollX(), e.getY() + getScrollY());
              }
              return false;
          }

Github

xiaoowuu/TableLayout

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