如何分隔添加到LinearLayoutICS?如何分隔添加到LinearLayoutICS?(How

2019-05-12 09:57发布

背景

我想要切换我的选择“应用程序管理器”的应用程序ActionBarSherlock库支持库谷歌已经创建的,因为它获得了更多的更新(ActionBarSherlock不再被开发,链接在这里 ),我认为它应该涵盖了很多功能。

问题

一切顺利的话(或者看起来是这样),除了在ActionBarSherlock名为ICSLinearLayout类我用来显示上分隔,现在被称为LinearLayoutICS。

它只是不显示分隔:

注意:您之前问“你为什么不只是使用一个GridView?”, 这里的原因,也是这个 ,如果我曾经想添加标题。

代码

该代码是差不多的,因为我已经用了ActionBarSherlock:

rowLayout=new LinearLayoutICS(_context,null);
rowLayout.setMeasureWithLargestChildEnabled(true);
rowLayout.setShowDividers(LinearLayout.SHOW_DIVIDER_MIDDLE);
rowLayout.setDividerDrawable(_context.getResources().getDrawable(R.drawable.list_divider_holo_dark));
rowLayout.setOrientation(LinearLayout.HORIZONTAL);
... // add views, layout params, etc...

问题

我如何使用这个类,以支持在支持库的所有支持的操作系统版本显示分隔?

什么是错的,我写的代码?

Answer 1:

OK,似乎setShowDividerssetDividerDrawable不能使用,因为LinearLayoutICS没有他们。

不仅如此,但它正在使用皮棉没有提醒我。

所以,我结束了与被复制LinearLayoutICS代码(从这里 ,希望它的最新版本)和一些原始的LinearLayout代码,使一些没有工作。 我希望这不会有任何错误。

万岁开源... :)

可悲的是setMeasureWithLargestChildEnabled不适用于旧的API,所以我觉得ActionBarSherlock方式仍的情况下,这就是你希望使用更好的东西。

编辑:setMeasureWithLargestChildEnabled方法不上ActionBarSherlock工作。

下面的代码,对于那些谁希望使用。 我希望未来的图书馆被更新的时候,我会记得再次检查这个问题。

public class LinearLayoutICS extends LinearLayout
  {
  private Drawable mDivider;
  private int      mDividerWidth,mDividerHeight;
  private int      mShowDividers;
  private int      mDividerPadding;

  public LinearLayoutICS(final Context context,final AttributeSet attrs)
    {
    super(context,attrs);
    // the R is from "android.support.v7.appcompat.R" .
    final TypedArray a=context.obtainStyledAttributes(attrs,R.styleable.LinearLayoutICS);
    mDivider=a.getDrawable(R.styleable.LinearLayoutICS_divider);
    if(mDivider!=null)
      {
      mDividerWidth=mDivider.getIntrinsicWidth();
      mDividerHeight=mDivider.getIntrinsicHeight();
      }
    else mDividerHeight=mDividerWidth=0;
    mShowDividers=a.getInt(R.styleable.LinearLayoutICS_showDividers,SHOW_DIVIDER_NONE);
    mDividerPadding=a.getDimensionPixelSize(R.styleable.LinearLayoutICS_dividerPadding,0);
    a.recycle();
    setWillNotDraw(mDivider==null);
    }

  @Override
  protected void onDraw(final Canvas canvas)
    {
    if(getOrientation()==VERTICAL)
      drawDividersVertical(canvas);
    else drawDividersHorizontal(canvas);
    }

  @Override
  protected void measureChildWithMargins(final View child,final int parentWidthMeasureSpec,final int widthUsed,final int parentHeightMeasureSpec,final int heightUsed)
    {
    if(mDivider!=null)
      {
      final int childIndex=indexOfChild(child);
      final int count=getChildCount();
      final LayoutParams params=(LayoutParams)child.getLayoutParams();
      // To display the dividers in-between the child views, we modify their margins
      // to create space.
      if(getOrientation()==VERTICAL)
        {
        if(hasDividerBeforeChildAt(childIndex))
          params.topMargin=mDividerHeight;
        else if(childIndex==count-1&&hasDividerBeforeChildAt(count))
          params.bottomMargin=mDividerHeight;
        }
      else if(hasDividerBeforeChildAt(childIndex))
        params.leftMargin=mDividerWidth;
      else if(childIndex==count-1&&hasDividerBeforeChildAt(count))
        params.rightMargin=mDividerWidth;
      }
    super.measureChildWithMargins(child,parentWidthMeasureSpec,widthUsed,parentHeightMeasureSpec,heightUsed);
    }

  void drawDividersVertical(final Canvas canvas)
    {
    final int count=getChildCount();
    for(int i=0;i<count;i++)
      {
      final View child=getChildAt(i);
      if(child!=null&&child.getVisibility()!=GONE&&hasDividerBeforeChildAt(i))
        {
        final LayoutParams lp=(LayoutParams)child.getLayoutParams();
        drawHorizontalDivider(canvas,child.getTop()-lp.topMargin);
        }
      }
    if(hasDividerBeforeChildAt(count))
      {
      final View child=getChildAt(count-1);
      int bottom=0;
      if(child==null)
        bottom=getHeight()-getPaddingBottom()-mDividerHeight;
      else bottom=child.getBottom();
      drawHorizontalDivider(canvas,bottom);
      }
    }

  void drawDividersHorizontal(final Canvas canvas)
    {
    final int count=getChildCount();
    for(int i=0;i<count;i++)
      {
      final View child=getChildAt(i);
      if(child!=null&&child.getVisibility()!=GONE&&hasDividerBeforeChildAt(i))
        {
        final LayoutParams lp=(LayoutParams)child.getLayoutParams();
        drawVerticalDivider(canvas,child.getLeft()-lp.leftMargin);
        }
      }
    if(hasDividerBeforeChildAt(count))
      {
      final View child=getChildAt(count-1);
      int right=0;
      if(child==null)
        right=getWidth()-getPaddingRight()-mDividerWidth;
      else right=child.getRight();
      drawVerticalDivider(canvas,right);
      }
    }

  void drawHorizontalDivider(final Canvas canvas,final int top)
    {
    mDivider.setBounds(getPaddingLeft()+mDividerPadding,top,getWidth()-getPaddingRight()-mDividerPadding,top+mDividerHeight);
    mDivider.draw(canvas);
    }

  void drawVerticalDivider(final Canvas canvas,final int left)
    {
    mDivider.setBounds(left,getPaddingTop()+mDividerPadding,left+mDividerWidth,getHeight()-getPaddingBottom()-mDividerPadding);
    mDivider.draw(canvas);
    }

  /**
   * Determines where to position dividers between children.
   *
   * @param childIndex Index of child to check for preceding divider
   * @return true if there should be a divider before the child at childIndex
   * @hide Pending API consideration. Currently only used internally by the system.
   */
  protected boolean hasDividerBeforeChildAt(final int childIndex)
    {
    if(childIndex==0)
      return (mShowDividers&SHOW_DIVIDER_BEGINNING)!=0;
    else if(childIndex==getChildCount())
      return (mShowDividers&SHOW_DIVIDER_END)!=0;
    else if((mShowDividers&SHOW_DIVIDER_MIDDLE)!=0)
      {
      boolean hasVisibleViewBefore=false;
      for(int i=childIndex-1;i>=0;i--)
        if(getChildAt(i).getVisibility()!=GONE)
          {
          hasVisibleViewBefore=true;
          break;
          }
      return hasVisibleViewBefore;
      }
    return false;
    }

  @Override
  public int getDividerPadding()
    {
    return mDividerPadding;
    }

  @Override
  public void setDividerPadding(final int dividerPadding)
    {
    mDividerPadding=dividerPadding;
    }

  @Override
  public void setShowDividers(final int showDividers)
    {
    if(mShowDividers!=showDividers)
      requestLayout();
    mShowDividers=showDividers;
    }

  @Override
  public void setDividerDrawable(final Drawable divider)
    {
    if(divider==mDivider)
      return;
    mDivider=divider;
    if(divider!=null)
      {
      mDividerWidth=divider.getIntrinsicWidth();
      mDividerHeight=divider.getIntrinsicHeight();
      }
    else
      {
      mDividerWidth=0;
      mDividerHeight=0;
      }
    setWillNotDraw(divider==null);
    requestLayout();
    }

  @Override
  public Drawable getDividerDrawable()
    {
    return mDivider;
    }
  }


文章来源: How to add dividers to LinearLayoutICS?