android.support.v7.widget.GridLayoutManager.findFirstVisibleItemPosition()方法的使用及代码示例

x33g5p2x  于2022-01-19 转载在 其他  
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本文整理了Java中android.support.v7.widget.GridLayoutManager.findFirstVisibleItemPosition()方法的一些代码示例，展示了GridLayoutManager.findFirstVisibleItemPosition()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。GridLayoutManager.findFirstVisibleItemPosition()方法的具体详情如下：
包路径：android.support.v7.widget.GridLayoutManager
类名称：GridLayoutManager
方法名：findFirstVisibleItemPosition

GridLayoutManager.findFirstVisibleItemPosition介绍

暂无

代码示例

代码示例来源：origin: facebook/litho

@Override
public int findFirstVisibleItemPosition() {
 return mGridLayoutManager.findFirstVisibleItemPosition();
}

代码示例来源：origin: bumptech/glide

@Override
public void onSaveInstanceState(@NonNull Bundle outState) {
 super.onSaveInstanceState(outState);
 if (grid != null) {
  int index = layoutManager.findFirstVisibleItemPosition();
  outState.putInt(STATE_POSITION_INDEX, index);
 }
}

代码示例来源：origin: jdsjlzx/LRecyclerView

/**
 * 找出第一个可见的Item的位置
 *
 * @param layoutManager
 * @return
 */
private int findFirstVisiblePosition(RecyclerView.LayoutManager layoutManager) {
  int firstVisiblePosition = 0;
  if (layoutManager instanceof GridLayoutManager) {
    firstVisiblePosition = ((GridLayoutManager) layoutManager).findFirstVisibleItemPosition();
  } else if (layoutManager instanceof LinearLayoutManager) {
    firstVisiblePosition = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
  } else if (layoutManager instanceof StaggeredGridLayoutManager) {
    int[] into = new int[((StaggeredGridLayoutManager) layoutManager).getSpanCount()];
    ((StaggeredGridLayoutManager) layoutManager).findFirstVisibleItemPositions(into);
    firstVisiblePosition = Integer.MAX_VALUE;
    for (int pos : into) {
      firstVisiblePosition = Math.min(pos, firstVisiblePosition);
    }
  }
  return firstVisiblePosition;
}

代码示例来源：origin: Hitomis/transferee

private void fillByRecyclerView(final List<ImageView> originImageList) {
  RecyclerView recyclerView = transConfig.getRecyclerView();
  int childCount = recyclerView.getChildCount();
  for (int i = 0; i < childCount; i++) {
    ImageView originImage = ((ImageView) recyclerView.getChildAt(i)
        .findViewById(transConfig.getImageId()));
    originImageList.add(originImage);
  }
  RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
  int firstPos = 0, lastPos = 0;
  int totalCount = layoutManager.getItemCount();
  if (layoutManager instanceof GridLayoutManager) {
    GridLayoutManager gridLayMan = (GridLayoutManager) layoutManager;
    firstPos = gridLayMan.findFirstVisibleItemPosition();
    lastPos = gridLayMan.findLastVisibleItemPosition();
  } else if (layoutManager instanceof LinearLayoutManager) {
    LinearLayoutManager linLayMan = (LinearLayoutManager) layoutManager;
    firstPos = linLayMan.findFirstVisibleItemPosition();
    lastPos = linLayMan.findLastVisibleItemPosition();
  }
  fillPlaceHolder(originImageList, totalCount, firstPos, lastPos);
}

代码示例来源：origin: zhihu/Matisse

public void refreshSelection() {
  GridLayoutManager layoutManager = (GridLayoutManager) mRecyclerView.getLayoutManager();
  int first = layoutManager.findFirstVisibleItemPosition();
  int last = layoutManager.findLastVisibleItemPosition();
  if (first == -1 || last == -1) {
    return;
  }
  Cursor cursor = getCursor();
  for (int i = first; i <= last; i++) {
    RecyclerView.ViewHolder holder = mRecyclerView.findViewHolderForAdapterPosition(first);
    if (holder instanceof MediaViewHolder) {
      if (cursor.moveToPosition(i)) {
        setCheckStatus(Item.valueOf(cursor), ((MediaViewHolder) holder).mMediaGrid);
      }
    }
  }
}

代码示例来源：origin: iMeiji/Toutiao

int firstVisiblePostion = gridLayoutManager.findFirstVisibleItemPosition();
if (firstVisiblePostion == 0) {

代码示例来源：origin: jdsjlzx/LRecyclerView

break;
case GridLayout:
  firstVisibleItemPosition = ((GridLayoutManager) layoutManager).findFirstVisibleItemPosition();
  lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
  break;

代码示例来源：origin: jdsjlzx/LRecyclerView

break;
case GridLayout:
  firstVisibleItemPosition = ((GridLayoutManager) layoutManager).findFirstVisibleItemPosition();
  lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
  break;

代码示例来源：origin: blipinsk/RecyclerViewHeader

public final boolean isFirstRowVisible() {
      if (linear != null) {
        return linear.findFirstVisibleItemPosition() == 0;
      } else if (grid != null) {
        return grid.findFirstVisibleItemPosition() == 0;
//            } else if (staggeredGrid != null) {
//                return staggeredGrid.findFirstCompletelyVisibleItemPositions() //TODO: 05.04.2016 implement staggered
      }
      return false; //shouldn't get here
    }

代码示例来源：origin: oubowu/PinnedSectionItemDecoration

/**
 * 找出第一个可见的Item的位置
 *
 * @param layoutManager
 * @return
 */
private int findFirstVisiblePosition(RecyclerView.LayoutManager layoutManager) {
  int firstVisiblePosition = 0;
  if (layoutManager instanceof GridLayoutManager) {
    firstVisiblePosition = ((GridLayoutManager) layoutManager).findFirstVisibleItemPosition();
  } else if (layoutManager instanceof LinearLayoutManager) {
    firstVisiblePosition = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
  } else if (layoutManager instanceof StaggeredGridLayoutManager) {
    int[] into = new int[((StaggeredGridLayoutManager) layoutManager).getSpanCount()];
    ((StaggeredGridLayoutManager) layoutManager).findFirstVisibleItemPositions(into);
    firstVisiblePosition = Integer.MAX_VALUE;
    for (int pos : into) {
      firstVisiblePosition = Math.min(pos, firstVisiblePosition);
    }
  }
  return firstVisiblePosition;
}

代码示例来源：origin: oubowu/PinnedSectionItemDecoration

mFirstVisiblePosition = ((GridLayoutManager) layoutManager).findFirstVisibleItemPosition();
} else if (layoutManager instanceof LinearLayoutManager) {
  mFirstVisiblePosition = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();

代码示例来源：origin: HomHomLin/Android-PullToRefreshRecyclerView

public int findFirstVisibleItemPosition(RecyclerView.LayoutManager layoutManager){
    if(layoutManager != null) {

      if (layoutManager instanceof LinearLayoutManager) {
        return ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
      }

      if (layoutManager instanceof GridLayoutManager) {
        return ((GridLayoutManager) layoutManager).findFirstVisibleItemPosition();
      }

    }
    return RecyclerView.NO_POSITION;
  }
}

代码示例来源：origin: mengzhidaren/RecyclerViewVideoDemo

public final boolean isFirstRowVisible() {
      if (linear != null) {
        return linear.findFirstVisibleItemPosition() == 0;
      } else if (grid != null) {
        return grid.findFirstVisibleItemPosition() == 0;
//            } else if (staggeredGrid != null) {
//                return staggeredGrid.findFirstCompletelyVisibleItemPositions() //TODO: 05.04.2016 implement staggered
      }
      return false; //shouldn't get here
    }

代码示例来源：origin: mengzhidaren/RecylerViewMultiHeaderView

public final boolean isFirstRowVisible() {
      if (linear != null) {
        return linear.findFirstVisibleItemPosition() == 0;
      } else if (grid != null) {
        return grid.findFirstVisibleItemPosition() == 0;
//            } else if (staggeredGrid != null) {
//                return staggeredGrid.findFirstCompletelyVisibleItemPositions() //TODO: 05.04.2016 implement staggered
      }
      return false; //shouldn't get here
    }

代码示例来源：origin: open-android/BaseRecyclerAndAdapter

public final boolean isFirstRowVisible() {
      if (linear != null) {
        return linear.findFirstVisibleItemPosition() == 0;
      } else if (grid != null) {
        return grid.findFirstVisibleItemPosition() == 0;
//            } else if (staggeredGrid != null) {
//                return staggeredGrid.findFirstCompletelyVisibleItemPositions() //TODO: 05.04.2016 implement staggered
      }
      return false; //shouldn't get here
    }

代码示例来源：origin: open-android/BaseRecyclerAndAdapter

public final boolean isFirstRowVisible() {
      if (linear != null) {
        return linear.findFirstVisibleItemPosition() == 0;
      } else if (grid != null) {
        return grid.findFirstVisibleItemPosition() == 0;
//            } else if (staggeredGrid != null) {
//                return staggeredGrid.findFirstCompletelyVisibleItemPositions() //TODO: 05.04.2016 implement staggered
      }
      return false; //shouldn't get here
    }

代码示例来源：origin: sdwfqin/AndroidSamples

@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
  super.onScrollStateChanged(recyclerView, newState);
  if (move && newState == RecyclerView.SCROLL_STATE_IDLE) {
    move = false;
    int n = mIndex - mManager.findFirstVisibleItemPosition();
    if (0 <= n && n < mRv.getChildCount()) {
      int top = mRv.getChildAt(n).getTop();
      mRv.smoothScrollBy(0, top);
    }
  }
}

代码示例来源：origin: wustor/GangedRecyclerview

@Override
  public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);
    if (move) {
      move = false;
      int n = mIndex - mManager.findFirstVisibleItemPosition();
      if (0 <= n && n < mRv.getChildCount()) {
        int top = mRv.getChildAt(n).getTop();
        mRv.scrollBy(0, top);
      }
    }
  }
}

代码示例来源：origin: qyxxjd/CommonAdapter

private int findFirstVisibleItemPosition(RecyclerView.LayoutManager layoutManager) {
    if (layoutManager instanceof GridLayoutManager) {
      return ((GridLayoutManager)layoutManager).findFirstVisibleItemPosition();
    } else if (layoutManager instanceof LinearLayoutManager) {
      return ((LinearLayoutManager)layoutManager).findFirstVisibleItemPosition();
    } else if (layoutManager instanceof StaggeredGridLayoutManager) {
      return ((StaggeredGridLayoutManager)layoutManager).findFirstVisibleItemPositions(null)[0];
    } else {
      return getFirstVisibleItemPositions();
    }
  }
}

代码示例来源：origin: sdwfqin/AndroidSamples

private void smoothMoveToPosition(int n) {
  int firstItem = mManager.findFirstVisibleItemPosition();
  int lastItem = mManager.findLastVisibleItemPosition();
  if (n <= firstItem) {
    mRv.scrollToPosition(n);
  } else if (n <= lastItem) {
    int top = mRv.getChildAt(n - firstItem).getTop();
    mRv.scrollBy(0, top);
  } else {
    mRv.scrollToPosition(n);
    move = true;
  }
}

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