android.support.v7.widget.GridLayoutManager#findFirstVisibleItemPosition ( )源码实例Demo

下面列出了android.support.v7.widget.GridLayoutManager#findFirstVisibleItemPosition ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。

源代码1 项目： AlbumCameraRecorder 文件： AlbumMediaAdapter.java

/**
 * 刷新所能看到的选择
 */
public void refreshSelection() {
    GridLayoutManager layoutManager = (GridLayoutManager) mRecyclerView.getLayoutManager();
    // 获取当前能看到的第一个，和最后一个
    int first = layoutManager.findFirstVisibleItemPosition();
    int last = layoutManager.findLastVisibleItemPosition();
    if (first == -1 || last == -1) {
        // 如果是-1就直接返回
        return;
    }
    // 获取数据源
    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(MultiMedia.valueOf(cursor), ((MediaViewHolder) holder).mMediaGrid);
            }
        }
    }
}

源代码2 项目： YImagePicker 文件： RecyclerViewTouchHelper.java

/**
 * 获取recyclerView滑动距离
 */
private int getScrollYDistance() {
    if (!(recyclerView.getLayoutManager() instanceof GridLayoutManager)) {
        return 0;
    }
    GridLayoutManager gridLayoutManager = (GridLayoutManager) recyclerView.getLayoutManager();
    int position = gridLayoutManager.findFirstVisibleItemPosition();
    if (position < 0) {
        position = 0;
    }
    View firstVisibleChildView = gridLayoutManager.findViewByPosition(position);
    if (firstVisibleChildView == null) {
        return 0;
    }

    int itemHeight = firstVisibleChildView.getHeight() + PViewSizeUtils.dp(recyclerView.getContext(), 2);
    return (position / getSpanCount()) * itemHeight - firstVisibleChildView.getTop();
}

源代码3 项目： Matisse 文件： AlbumMediaAdapter.java

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);
            }
        }
    }
}

源代码4 项目： GridPagerSnapHelper 文件： BasePageIndicator.java

@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
    super.onScrollStateChanged(recyclerView, newState);

    onPageScrollStateChanged(newState);

    if (newState == RecyclerView.SCROLL_STATE_IDLE) {
        RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();

        int position = 0;
        if (layoutManager instanceof GridLayoutManager) {
            GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
            position = gridLayoutManager.findFirstVisibleItemPosition();
            int row = gridLayoutManager.getSpanCount();
            position = position / (row * mPageColumn);
        } else if (layoutManager instanceof LinearLayoutManager) {
            LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
            position = linearLayoutManager.findFirstVisibleItemPosition();
        }

        onPageSelected(position);
    }
}

源代码5 项目： YImagePicker 文件： RecyclerViewTouchHelper.java

private int getItemHeight() {
    if (!(recyclerView.getLayoutManager() instanceof GridLayoutManager)) {
        return 0;
    }
    GridLayoutManager gridLayoutManager = (GridLayoutManager) recyclerView.getLayoutManager();
    int position = gridLayoutManager.findFirstVisibleItemPosition();
    if (position < 0) {
        position = 0;
    }
    View firstVisibleChildView = gridLayoutManager.findViewByPosition(position);
    if (firstVisibleChildView == null) {
        return 0;
    }
    return firstVisibleChildView.getHeight();
}

源代码6 项目： letv 文件： ChannelFragmentAdapter.java

private void doClickOtherToNavigation(ViewGroup parent, int position, MyViewHolder myHolder) {
    RecyclerView recyclerView = (RecyclerView) parent;
    LayoutManager manager = recyclerView.getLayoutManager();
    View currentView = manager.findViewByPosition(myHolder.getAdapterPosition());
    View preTargetView = manager.findViewByPosition(this.mTopSize);
    GridLayoutManager gridLayoutManager = (GridLayoutManager) manager;
    int spanCount = gridLayoutManager.getSpanCount();
    int targetPosition = this.mTopSize + 1;
    if (recyclerView.indexOfChild(preTargetView) >= 0) {
        int targetX = preTargetView.getLeft();
        int targetY = preTargetView.getTop();
        if ((targetPosition - 1) % spanCount == 0) {
            View targetView = manager.findViewByPosition(targetPosition);
            targetX = targetView.getLeft();
            targetY = targetView.getTop();
        } else {
            targetX += preTargetView.getWidth() + UIsUtils.dipToPx(TitleBar.SHAREBTN_RIGHT_MARGIN);
            if (gridLayoutManager.findLastVisibleItemPosition() == getItemCount() - 1 && (((getItemCount() - 1) - this.mTopSize) - 2) % spanCount == 0) {
                if (gridLayoutManager.findFirstVisibleItemPosition() != 0) {
                    targetY += preTargetView.getHeight() + UIsUtils.dipToPx(TitleBar.SHAREBTN_RIGHT_MARGIN);
                } else if (gridLayoutManager.findFirstCompletelyVisibleItemPosition() != 0) {
                    targetY += (-recyclerView.getChildAt(0).getTop()) - recyclerView.getPaddingTop();
                }
            }
        }
        moveOtherToMy(myHolder);
        startAnimation(recyclerView, currentView, (float) targetX, (float) targetY);
        return;
    }
    moveOtherToMy(myHolder);
    int index = (this.mTopSize % spanCount) - 1;
    if (index < 0) {
        index = spanCount - 1;
    }
    startAnimation(recyclerView, currentView, (float) ((currentView.getWidth() * index) + (index == 0 ? 0 : (index - 1) * UIsUtils.dipToPx(TitleBar.SHAREBTN_RIGHT_MARGIN))), 0.0f);
}

源代码7 项目： InstagramPhotoPicker 文件： CoordinatorRecyclerView.java

private boolean isScrollTop(MotionEvent ev) {
    LayoutManager layoutManager = getLayoutManager();
    if (layoutManager instanceof GridLayoutManager) {
        GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
        if (gridLayoutManager.findFirstVisibleItemPosition() == 0 &&
                gridLayoutManager.findViewByPosition(0).getTop() == gridLayoutManager.getTopDecorationHeight(gridLayoutManager.findViewByPosition(0))) {
            if (!scrollTop) {
                dragDistanceY = (int) (downPositionY - ev.getRawY());
                scrollTop = true;
            }
            return true;
        }
    }
    return false;
}

源代码8 项目： Movie-Check 文件： ListReviewFragment.java

@Override
public void showReviews() {
    linearLayoutAnyFounded.setVisibility(View.GONE);
    linearLayoutLoadFailed.setVisibility(View.GONE);
    recyclerViewReviews.setVisibility(View.VISIBLE);
    final GridLayoutManager layoutManager = new GridLayoutManager(getActivity(), 1, GridLayoutManager.VERTICAL, false);
    recyclerViewReviews.setLayoutManager(layoutManager);
    recyclerViewReviews.setItemAnimator(new DefaultItemAnimator());
    listViewAdapter = new ListViewAdapterWithPagination(
            new ReviewListAdapter(this.reviewList, new OnItemClickListener<Review>() {
                @Override
                public void onClick(Review review, View view) {
                    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(review.getUrl()));
                    startActivity(browserIntent);
                }

                @Override
                public void onLongClick(Review review, View view) {

                }
            }),
            new OnShowMoreListener() {
                @Override
                public void showMore() {
                    scrollToItem = layoutManager.findFirstVisibleItemPosition();
                    presenter.loadReviews(movie, ++page);
                }
            },
            itensPerPage);
    recyclerViewReviews.setAdapter(listViewAdapter);
    recyclerViewReviews.scrollToPosition(scrollToItem);
}

源代码9 项目： Movie-Check 文件： ListNowPlayingMoviesActivity.java

@Override
public void showMovies(final List<Movie> newMovieList) {
    if (movieList == null) {
        movieList = newMovieList;
    } else {
        movieList.addAll(newMovieList);
    }
    linearLayoutAnyFounded.setVisibility(View.GONE);
    linearLayoutLoadFailed.setVisibility(View.GONE);
    recyclerViewMovies.setVisibility(View.VISIBLE);
    final GridLayoutManager layoutManager = new GridLayoutManager(this, columns, GridLayoutManager.VERTICAL, false);
    recyclerViewMovies.setLayoutManager(layoutManager);
    recyclerViewMovies.setItemAnimator(new DefaultItemAnimator());
    listViewAdapter = new ListViewAdapterWithPagination(
            new NowPlayingMovieListAdapter(movieList, new OnItemClickListener<Movie>() {
                @Override
                public void onClick(Movie movie, View view) {
                    startActivity(MovieProfileActivity.newIntent(ListNowPlayingMoviesActivity.this, movie), ActivityOptionsCompat.makeSceneTransitionAnimation(ListNowPlayingMoviesActivity.this, view.findViewById(R.id.imageview_backdrop), "movieBackdrop").toBundle());
                }

                @Override
                public void onLongClick(Movie movie, View view) {

                }
            }),
            new OnShowMoreListener() {
                @Override
                public void showMore() {
                    scrollToItem = layoutManager.findFirstVisibleItemPosition();
                    presenter.loadMovies(++page);
                }
            },
            itensPerPage);
    recyclerViewMovies.setAdapter(listViewAdapter);
    recyclerViewMovies.scrollToPosition(scrollToItem);
}

源代码10 项目： PullZoomView 文件： PullToZoomRecyclerViewEx.java

private boolean isFirstItemVisible() {
    if (mRootView != null) {
        final RecyclerView.Adapter adapter = mRootView.getAdapter();
        final GridLayoutManager mLayoutmanager = (GridLayoutManager) mRootView.getLayoutManager();


        if (null == adapter || adapter.getItemCount() == 0) {
            return true;
        } else {
            /**
             * This check should really just be:
             * mRootView.getFirstVisiblePosition() == 0, but PtRListView
             * internally use a HeaderView which messes the positions up. For
             * now we'll just add one to account for it and rely on the inner
             * condition which checks getTop().
             */

            int[] into = {0,0};
            if (mLayoutmanager != null)
                into[0] = mLayoutmanager.findFirstVisibleItemPosition();
            if (into.length > 0 && into.length > 0 && into[0] <= 1) {
                final View firstVisibleChild = mRootView.getChildAt(0);
                if (firstVisibleChild != null) {
                    return firstVisibleChild.getTop() >= mRootView.getTop();
                }
            }
        }
    }

    return false;
}

源代码11 项目： Movie-Check 文件： SearchMovieActivity.java

@Override
public void showMovies(final List<Movie> newMovieList) {
    if (movieList == null) {
        movieList = newMovieList;
    } else {
        movieList.addAll(newMovieList);
    }
    linearLayoutAnyFounded.setVisibility(View.GONE);
    linearLayoutLoadFailed.setVisibility(View.GONE);
    recyclerViewMovies.setVisibility(View.VISIBLE);
    final GridLayoutManager layoutManager = new GridLayoutManager(this, columns, GridLayoutManager.VERTICAL, false);
    layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            return position >= movieList.size() ? columns : 1;
        }
    });
    recyclerViewMovies.setLayoutManager(layoutManager);
    recyclerViewMovies.setItemAnimator(new DefaultItemAnimator());
    listViewAdapter = new ListViewAdapterWithPagination(
            new MovieListAdapter(movieList, new OnItemClickListener<Movie>() {
                @Override
                public void onClick(Movie movie, View view) {
                    startActivity(MovieProfileActivity.newIntent(SearchMovieActivity.this, movie), ActivityOptionsCompat.makeSceneTransitionAnimation(SearchMovieActivity.this, view.findViewById(R.id.imageview_poster), "moviePoster").toBundle());
                }

                @Override
                public void onLongClick(Movie movie, View view) {

                }
            }
            ),
            new OnShowMoreListener() {
                @Override
                public void showMore() {
                    scrollToItem = layoutManager.findFirstVisibleItemPosition();
                    presenter.search(query, ++page);
                }
            },
            itensPerPage);
    recyclerViewMovies.setAdapter(listViewAdapter);
    recyclerViewMovies.scrollToPosition(scrollToItem);
}

源代码12 项目： Movie-Check 文件： ListUpcomingMoviesActivity.java

@Override
public void showMovies(final List<Movie> newMovieList) {
    if (movieList == null) {
        movieList = newMovieList;
    } else {
        movieList.addAll(newMovieList);
    }
    linearLayoutAnyFounded.setVisibility(View.GONE);
    linearLayoutLoadFailed.setVisibility(View.GONE);
    recyclerViewMovies.setVisibility(View.VISIBLE);
    final GridLayoutManager layoutManager = new GridLayoutManager(this, columns, GridLayoutManager.VERTICAL, false);
    layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            return position >= movieList.size() ? columns : 1;
        }
    });
    recyclerViewMovies.setLayoutManager(layoutManager);
    recyclerViewMovies.setItemAnimator(new DefaultItemAnimator());
    listViewAdapter = new ListViewAdapterWithPagination(
            new UpcomingMovieListAdapter(movieList, new OnItemClickListener<Movie>() {

                @Override
                public void onClick(Movie movie, View view) {
                    startActivity(MovieProfileActivity.newIntent(ListUpcomingMoviesActivity.this, movie), ActivityOptionsCompat.makeSceneTransitionAnimation(ListUpcomingMoviesActivity.this, view.findViewById(R.id.imageview_poster), "moviePoster").toBundle());
                }

                @Override
                public void onLongClick(Movie movie, View view) {

                }
            }),
            new OnShowMoreListener() {
                @Override
                public void showMore() {
                    scrollToItem = layoutManager.findFirstVisibleItemPosition();
                    presenter.loadMovies(++page);
                }
            },
            itensPerPage);
    recyclerViewMovies.setAdapter(listViewAdapter);
    recyclerViewMovies.scrollToPosition(scrollToItem);
}

源代码13 项目： Movie-Check 文件： ListTopRatedMoviesActivity.java

@Override
public void showMovies(final List<Movie> newMovieList) {
    if (movieList == null) {
        movieList = newMovieList;
    } else {
        movieList.addAll(newMovieList);
    }
    linearLayoutAnyFounded.setVisibility(View.GONE);
    linearLayoutLoadFailed.setVisibility(View.GONE);
    recyclerViewMovies.setVisibility(View.VISIBLE);
    final GridLayoutManager layoutManager = new GridLayoutManager(this, columns, GridLayoutManager.VERTICAL, false);
    layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            return position >= movieList.size() ? columns : 1;
        }
    });
    recyclerViewMovies.setLayoutManager(layoutManager);
    recyclerViewMovies.setItemAnimator(new DefaultItemAnimator());
    listViewAdapter = new ListViewAdapterWithPagination(
            new TopRatedMovieListAdapter(movieList, new OnItemClickListener<Movie>() {
                @Override
                public void onClick(Movie movie, View view) {
                    startActivity(MovieProfileActivity.newIntent(ListTopRatedMoviesActivity.this, movie), ActivityOptionsCompat.makeSceneTransitionAnimation(ListTopRatedMoviesActivity.this, view.findViewById(R.id.imageview_poster), "moviePoster").toBundle());
                }

                @Override
                public void onLongClick(Movie movie, View view) {

                }
            }
            ),
            new OnShowMoreListener() {
                @Override
                public void showMore() {
                    scrollToItem = layoutManager.findFirstVisibleItemPosition();
                    presenter.loadMovies(++page);
                }
            },
            itensPerPage);
    recyclerViewMovies.setAdapter(listViewAdapter);
    recyclerViewMovies.scrollToPosition(scrollToItem);
}

源代码14 项目： Movie-Check 文件： SearchPersonActivity.java

@Override
public void showPerson(final List<Person> personList) {
    if (this.personList == null) {
        this.personList = personList;
    } else {
        this.personList.addAll(personList);
    }
    linearLayoutAnyFounded.setVisibility(View.GONE);
    linearLayoutLoadFailed.setVisibility(View.GONE);
    recyclerViewMovies.setVisibility(View.VISIBLE);
    final GridLayoutManager layoutManager = new GridLayoutManager(this, columns, GridLayoutManager.VERTICAL, false);
    layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            return position >= SearchPersonActivity.this.personList.size() ? columns : 1;
        }
    });
    recyclerViewMovies.setLayoutManager(layoutManager);
    recyclerViewMovies.setItemAnimator(new DefaultItemAnimator());
    listViewAdapter = new ListViewAdapterWithPagination(
            new PersonListAdapter(this.personList, new OnItemClickListener<Person>() {
                @Override
                public void onClick(Person person, View view) {
                    startActivity(PersonProfileActivity.newIntent(SearchPersonActivity.this, person), ActivityOptionsCompat.makeSceneTransitionAnimation(SearchPersonActivity.this, view.findViewById(R.id.imageview_photo), "personPhoto").toBundle());
                }

                @Override
                public void onLongClick(Person person, View view) {

                }
            }
            ),
            new OnShowMoreListener() {
                @Override
                public void showMore() {
                    scrollToItem = layoutManager.findFirstVisibleItemPosition();
                    presenter.search(query, ++page);
                }
            },
            itensPerPage);
    recyclerViewMovies.setAdapter(listViewAdapter);
    recyclerViewMovies.scrollToPosition(scrollToItem);
}

源代码15 项目： Movie-Check 文件： ListPopularMoviesActivity.java

@Override
public void showMovies(final List<Movie> newMovieList) {
    if (movieList == null) {
        movieList = newMovieList;
    } else {
        movieList.addAll(newMovieList);
    }
    linearLayoutAnyFounded.setVisibility(View.GONE);
    linearLayoutLoadFailed.setVisibility(View.GONE);
    recyclerViewMovies.setVisibility(View.VISIBLE);
    final GridLayoutManager layoutManager = new GridLayoutManager(this, columns, GridLayoutManager.VERTICAL, false);
    layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            return position >= movieList.size() ? columns : 1;
        }
    });
    recyclerViewMovies.setLayoutManager(layoutManager);
    recyclerViewMovies.setItemAnimator(new DefaultItemAnimator());
    listViewAdapter = new ListViewAdapterWithPagination(
            new MovieListAdapter(movieList, new OnItemClickListener<Movie>() {
                @Override
                public void onClick(Movie movie, View view) {
                    startActivity(MovieProfileActivity.newIntent(ListPopularMoviesActivity.this, movie), ActivityOptionsCompat.makeSceneTransitionAnimation(ListPopularMoviesActivity.this, view.findViewById(R.id.imageview_poster), "moviePoster").toBundle());
                }

                @Override
                public void onLongClick(Movie movie, View view) {

                }
            }
            ),
            new OnShowMoreListener() {
                @Override
                public void showMore() {
                    scrollToItem = layoutManager.findFirstVisibleItemPosition();
                    presenter.loadMovies(++page);
                }
            },
            itensPerPage);
    recyclerViewMovies.setAdapter(listViewAdapter);
    recyclerViewMovies.scrollToPosition(scrollToItem);
}

方法所在类

android.support.v7.widget.GridLayoutManager