Android 动态生成布局的方式摘要

• RadioButton    去除前面的圆圈：

              布局中：android:button="@null"

             代码中：RadioButton rb = new RadioButton(mContext);
        rb.setButtonDrawable(new ColorDrawable(Color.TRANSPARENT));

• 布局调整

      设置内边距：rb.setPadding(15, 10, 15, 10);

• RadioGroup流式布局

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.RadioGroup;

/**
 * 可换行
 * 流式布局的RadioGroup
 */
public class FlowRadioGroup extends RadioGroup {
    //设置的间距长度
    private static final int len = 40;

    public FlowRadioGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public FlowRadioGroup(Context context) {
        super(context);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int maxWidth = MeasureSpec.getSize(widthMeasureSpec);
        int childCount = getChildCount();
        int x = 0;
        int y = 0;
        int row = 0;
        for (int index = 0; index < childCount; index++) {
            final View child = getChildAt(index);
            if (child.getVisibility() != View.GONE) {
                child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
                // 此处增加onlayout中的换行判断，用于计算所需的高度
                int width = child.getMeasuredWidth();
                int height = child.getMeasuredHeight();
                x += width + len;
                y = row * height + height + len * (row + 1);
                if (x > maxWidth) {
                    x = width + len;
                    row++;
                    y = row * height + height + len * (row + 1);
                }
            }
        }
        // 设置容器所需的宽度和高度
        setMeasuredDimension(maxWidth, y);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        final int childCount = getChildCount();
        int maxWidth = r - l;
        int x = 0;
        int y = 0;
        int row = 0;
        for (int i = 0; i < childCount; i++) {
            final View child = this.getChildAt(i);
            if (child.getVisibility() != View.GONE) {
                int width = child.getMeasuredWidth();
                int height = child.getMeasuredHeight();
                x += width + len;
                y = row * height + height + len * (row + 1);
                if (x > maxWidth) {
                    x = width + len;
                    row++;
                    y = row * height + height + len * (row + 1);
                }
                child.layout(x - width, y - height, x, y);
            }
        }
    }
}

• 动态改变颜色和字体样式

• public View getView(int position, View convertView, ViewGroup parent) {
          ViewHolder viewHolder;
          if (convertView == null) {
              final LayoutInflater inflater = LayoutInflater.from(mContext);
              convertView = inflater.inflate(R.layout.item_left_symptom_layout, null);
              viewHolder = new ViewHolder();
              convertView.setTag(viewHolder);
              viewHolder.tv = (TextView) convertView.findViewById(R.id.tv);
          } else {
              viewHolder = (ViewHolder) convertView.getTag();
          }
          viewHolder.tv.setText(list.get(position).getName());
          if (mSelectItem == position) {
              viewHolder.tv.setBackgroundColor(Color.parseColor("#F4F4F4"));//背景色与主界面的FrameLayout一样
              viewHolder.tv.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
          } else {
              viewHolder.tv.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));//空白图片
              viewHolder.tv.setTypeface(Typeface.defaultFromStyle(Typeface.NORMAL));
          }
          return convertView;
      }
  
      private class ViewHolder {
          TextView tv;
      }
  
      public void setSelectItem(int selectItem) {
          this.mSelectItem = selectItem;
          notifyDataSetChanged();
      }