下面列出了怎么用android.support.v7.widget.RecyclerView.LayoutManager的API类实例代码及写法，或者点击链接到github查看源代码。
private boolean isLastColum(RecyclerView parent, int pos, int spanCount, int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if ((pos + 1) % spanCount == 0 && pos >= spanCount - 1) {
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
if (((StaggeredGridLayoutManager) layoutManager).getOrientation() == 1) {
if ((pos + 1) % spanCount == 0) {
return true;
}
} else if (pos >= childCount - (childCount % spanCount)) {
return true;
}
}
return false;
}
private boolean isLastRaw(RecyclerView parent, int pos, int spanCount, int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if (pos >= childCount - (childCount % spanCount)) {
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
if (((StaggeredGridLayoutManager) layoutManager).getOrientation() == 1) {
if (pos >= childCount - (childCount % spanCount)) {
return true;
}
} else if ((pos + 1) % spanCount == 0) {
return true;
}
}
return false;
}
private boolean isLastColum(RecyclerView parent, int pos, int spanCount, int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if ((pos + 1) % spanCount == 0) {
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
if (((StaggeredGridLayoutManager) layoutManager).getOrientation() == 1) {
if ((pos + 1) % spanCount == 0) {
return true;
}
} else if (pos >= childCount - (childCount % spanCount)) {
return true;
}
}
return false;
}
private boolean isLastRaw(RecyclerView parent, int pos, int spanCount, int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if (pos >= childCount - (childCount % spanCount)) {
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
if (((StaggeredGridLayoutManager) layoutManager).getOrientation() == 1) {
if (pos >= childCount - (childCount % spanCount)) {
return true;
}
} else if ((pos + 1) % spanCount == 0) {
return true;
}
}
return false;
}
private boolean isLastColum(RecyclerView parent, int pos, int spanCount, int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if ((pos + 1) % spanCount == 0) {
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
if (((StaggeredGridLayoutManager) layoutManager).getOrientation() == 1) {
if ((pos + 1) % spanCount == 0) {
return true;
}
} else if (pos >= childCount - (childCount % spanCount)) {
return true;
}
}
return false;
}
private boolean isLastRaw(RecyclerView parent, int pos, int spanCount, int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if (pos >= childCount - (childCount % spanCount)) {
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
if (((StaggeredGridLayoutManager) layoutManager).getOrientation() == 1) {
if (pos >= childCount - (childCount % spanCount)) {
return true;
}
} else if ((pos + 1) % spanCount == 0) {
return true;
}
}
return false;
}
private boolean isLastColum(RecyclerView parent, int pos, int spanCount,
int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
{
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
{
return true;
}
} else {
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最后一列，则不需要绘制右边
{
return true;
}
}
}
return false;
}
private int getSpanCount(RecyclerView parent)
{
// 列数
int spanCount = -1;
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager)
{
spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
} else if (layoutManager instanceof StaggeredGridLayoutManager)
{
spanCount = ((StaggeredGridLayoutManager) layoutManager)
.getSpanCount();
}
return spanCount;
}
private int getSpanCount(RecyclerView parent)
{
// 列数
int spanCount = -1;
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager)
{
spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
} else if (layoutManager instanceof StaggeredGridLayoutManager)
{
spanCount = ((StaggeredGridLayoutManager) layoutManager)
.getSpanCount();
}
return spanCount;
}
public void onMoved(RecyclerView recyclerView, ViewHolder viewHolder, int fromPos, ViewHolder target, int toPos, int x, int y) {
LayoutManager layoutManager = recyclerView.getLayoutManager();
if (layoutManager instanceof ViewDropHandler) {
((ViewDropHandler) layoutManager).prepareForDrop(viewHolder.itemView, target.itemView, x, y);
return;
}
if (layoutManager.canScrollHorizontally()) {
if (layoutManager.getDecoratedLeft(target.itemView) <= recyclerView.getPaddingLeft()) {
recyclerView.scrollToPosition(toPos);
}
if (layoutManager.getDecoratedRight(target.itemView) >= recyclerView.getWidth() - recyclerView.getPaddingRight()) {
recyclerView.scrollToPosition(toPos);
}
}
if (layoutManager.canScrollVertically()) {
if (layoutManager.getDecoratedTop(target.itemView) <= recyclerView.getPaddingTop()) {
recyclerView.scrollToPosition(toPos);
}
if (layoutManager.getDecoratedBottom(target.itemView) >= recyclerView.getHeight() - recyclerView.getPaddingBottom()) {
recyclerView.scrollToPosition(toPos);
}
}
}
private ViewHolder findSwipedView(MotionEvent motionEvent) {
LayoutManager lm = this.mRecyclerView.getLayoutManager();
if (this.mActivePointerId == -1) {
return null;
}
int pointerIndex = MotionEventCompat.findPointerIndex(motionEvent, this.mActivePointerId);
float dy = MotionEventCompat.getY(motionEvent, pointerIndex) - this.mInitialTouchY;
float absDx = Math.abs(MotionEventCompat.getX(motionEvent, pointerIndex) - this.mInitialTouchX);
float absDy = Math.abs(dy);
if (absDx < ((float) this.mSlop) && absDy < ((float) this.mSlop)) {
return null;
}
if (absDx > absDy && lm.canScrollHorizontally()) {
return null;
}
if (absDy > absDx && lm.canScrollVertically()) {
return null;
}
View child = findChildView(motionEvent);
if (child != null) {
return this.mRecyclerView.getChildViewHolder(child);
}
return null;
}
public void setMeasuredDimension(Rect childrenBounds, int wSpec, int hSpec) {
int height;
int width;
if (this.mCachedBorders == null) {
super.setMeasuredDimension(childrenBounds, wSpec, hSpec);
}
int horizontalPadding = getPaddingLeft() + getPaddingRight();
int verticalPadding = getPaddingTop() + getPaddingBottom();
if (this.mOrientation == 1) {
height = LayoutManager.chooseSize(hSpec, childrenBounds.height() + verticalPadding, getMinimumHeight());
width = LayoutManager.chooseSize(wSpec, this.mCachedBorders[this.mCachedBorders.length - 1] + horizontalPadding, getMinimumWidth());
} else {
width = LayoutManager.chooseSize(wSpec, childrenBounds.width() + horizontalPadding, getMinimumWidth());
height = LayoutManager.chooseSize(hSpec, this.mCachedBorders[this.mCachedBorders.length - 1] + verticalPadding, getMinimumHeight());
}
setMeasuredDimension(width, height);
}
@Override
public void measureChildWithMargins(View child, int widthUsed, int heightUsed) {
final RecyclerView.LayoutParams lp = (RecyclerView.LayoutParams) child.getLayoutParams();
final Rect insets = new Rect();
calculateItemDecorationsForChild(child, insets);
widthUsed += insets.left + insets.right;
heightUsed += insets.top + insets.bottom;
int width = mRecyclerView != null ? mRecyclerView.getWidth() : mMeasuredWidth;
int height = mRecyclerView != null ? mRecyclerView.getHeight() : mMeasuredHeight;
final int widthSpec = LayoutManager.getChildMeasureSpec(width,
getPaddingLeft() + getPaddingRight() +
lp.leftMargin + lp.rightMargin + widthUsed, lp.width,
false && canScrollHorizontally());
final int heightSpec = LayoutManager.getChildMeasureSpec(height,
getPaddingTop() + getPaddingBottom() +
lp.topMargin + lp.bottomMargin + heightUsed, lp.height,
false && canScrollVertically());
child.measure(widthSpec, heightSpec);
}
/**
* Please attach after {{@link LayoutManager} is setting}
* Attaches the {@link CenterSnapHelper} to the provided RecyclerView, by calling
* {@link RecyclerView#setOnFlingListener(RecyclerView.OnFlingListener)}.
* You can call this method with {@code null} to detach it from the current RecyclerView.
*
* @param recyclerView The RecyclerView instance to which you want to add this helper or
* {@code null} if you want to remove CenterSnapHelper from the current
* RecyclerView.
* @throws IllegalArgumentException if there is already a {@link RecyclerView.OnFlingListener}
* attached to the provided {@link RecyclerView}.
*/
public void attachToRecyclerView(@Nullable RecyclerView recyclerView)
throws IllegalStateException {
if (mRecyclerView == recyclerView) {
return; // nothing to do
}
if (mRecyclerView != null) {
destroyCallbacks();
}
mRecyclerView = recyclerView;
if (mRecyclerView != null) {
final LayoutManager layoutManager = mRecyclerView.getLayoutManager();
if (!(layoutManager instanceof BannerLayoutManager)) return;
setupCallbacks();
mGravityScroller = new Scroller(mRecyclerView.getContext(),
new DecelerateInterpolator());
snapToCenterView((BannerLayoutManager) layoutManager,
((BannerLayoutManager) layoutManager).onPageChangeListener);
}
}
private boolean isLastRaw(RecyclerView parent, int pos, int spanCount, int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
childCount = childCount - childCount % spanCount;
if (pos >= childCount) {
// 如果是最后一行，则不需要绘制底部
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager).getOrientation();
// StaggeredGridLayoutManager 且纵向滚动
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
childCount = childCount - childCount % spanCount;
// 如果是最后一行，则不需要绘制底部
if (pos >= childCount)
return true;
} else {
// StaggeredGridLayoutManager 且横向滚动
// 如果是最后一行，则不需要绘制底部
if ((pos + 1) % spanCount == 0) {
return true;
}
}
}
return false;
}
private boolean isLastRaw(RecyclerView parent, int pos, int spanCount, int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最后一行，则不需要绘制底部
return true;
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
// StaggeredGridLayoutManager 且纵向滚动
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
childCount = childCount - childCount % spanCount;
// 如果是最后一行，则不需要绘制底部
if (pos >= childCount)
return true;
} else
// StaggeredGridLayoutManager 且横向滚动
{
// 如果是最后一行，则不需要绘制底部
if ((pos + 1) % spanCount == 0) {
return true;
}
}
}
return false;
}
private boolean isLastColum(RecyclerView parent, int pos, int spanCount,
int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
{
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
{
return true;
}
} else {
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最后一列，则不需要绘制右边
return true;
}
}
return false;
}
/**
* Please attach after {{@link LayoutManager} is setting}
* Attaches the {@link CenterSnapHelper} to the provided RecyclerView, by calling
* {@link RecyclerView#setOnFlingListener(RecyclerView.OnFlingListener)}.
* You can call this method with {@code null} to detach it from the current RecyclerView.
*
* @param recyclerView The RecyclerView instance to which you want to add this helper or
* {@code null} if you want to remove CenterSnapHelper from the current
* RecyclerView.
* @throws IllegalArgumentException if there is already a {@link RecyclerView.OnFlingListener}
* attached to the provided {@link RecyclerView}.
*/
public void attachToRecyclerView(@Nullable RecyclerView recyclerView)
throws IllegalStateException {
if (mRecyclerView == recyclerView) {
return; // nothing to do
}
if (mRecyclerView != null) {
destroyCallbacks();
}
mRecyclerView = recyclerView;
if (mRecyclerView != null) {
final LayoutManager layoutManager = mRecyclerView.getLayoutManager();
if (!(layoutManager instanceof ViewPagerLayoutManager)) return;
setupCallbacks();
mGravityScroller = new Scroller(mRecyclerView.getContext(),
new DecelerateInterpolator());
snapToCenterView((ViewPagerLayoutManager) layoutManager,
((ViewPagerLayoutManager) layoutManager).onPageChangeListener);
}
}
private void initViews() {
mRecyclerView = (SWRecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.getSwipeMessageBuilder()
.withFontPath(getString(R.string.droidSerif))
.withSwipeDirection(SwipeMessageBuilder.BOTH)
.build();
LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
mRecyclerView.setLayoutManager(layoutManager);
reminders.add("Reminder 1");
reminders.add("Reminder 2");
reminders.add("Reminder 3");
reminders.add("Reminder 4");
reminders.add("Reminder 5");
reminders.add("Reminder 6");
reminders.add("Reminder 7");
reminders.add("Reminder 8");
reminders.add("Reminder 9");
reminders.add("Reminder 10");
mAdapter = new io.huannguyen.swipeablerv.demo.SampleAdapter(reminders);
// allow swiping with both directions (left-to-right and right-to-left)
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setupSwipeToDismiss(mAdapter, ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT);
}
private int getSpanCount(RecyclerView parent)
{
// 列数
int spanCount = -1;
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager)
{
spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
} else if (layoutManager instanceof StaggeredGridLayoutManager)
{
spanCount = ((StaggeredGridLayoutManager) layoutManager)
.getSpanCount();
}
return spanCount;
}
private boolean isLastColum(RecyclerView parent, int pos, int spanCount,
int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
{
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
{
return true;
}
} else {
childCount = childCount % spanCount;
if (pos <= childCount)// 如果是最后一列，则不需要绘制右边
return true;
}
}
return false;
}
private boolean isLastColum(RecyclerView parent, int pos, int spanCount,
int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
{
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
{
return true;
}
} else {
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最后一列，则不需要绘制右边
return true;
}
}
return false;
}
private boolean isLastColum(RecyclerView parent, int pos, int spanCount,
int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if ((pos + 1) % spanCount == 0)
// 如果是最后一列，则不需要绘制右边
{
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
{
return true;
}
} else {
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最后一列，则不需要绘制右边
return true;
}
}
return false;
}
private boolean isLastRaw(RecyclerView parent, int pos, int spanCount,
int childCount) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最后一行，则不需要绘制底部
return true;
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
// StaggeredGridLayoutManager 且纵向滚动
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
childCount = childCount - childCount % spanCount;
// 如果是最后一行，则不需要绘制底部
if (pos >= childCount)
return true;
// StaggeredGridLayoutManager 且横向滚动
} else {
// 如果是最后一行，则不需要绘制底部
if ((pos + 1) % spanCount == 0) {
return true;
}
}
}
return false;
}
private int getSpanCount(RecyclerView parent)
{
// 列数
int spanCount = -1;
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager)
{
spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
} else if (layoutManager instanceof StaggeredGridLayoutManager)
{
spanCount = ((StaggeredGridLayoutManager) layoutManager)
.getSpanCount();
}
return spanCount;
}
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
LayoutManager manager = recyclerView.getLayoutManager();
if (manager instanceof GridLayoutManager) {
((GridLayoutManager) manager).setSpanSizeLookup(new SpanSizeLookup() {
public int getSpanSize(int position) {
if (BaseRecycleAdapter.this.isCategoryType(position)) {
return BaseRecycleAdapter.this.headSpanCount;
}
return BaseRecycleAdapter.this.bodySpanCount;
}
});
}
}
public LocalFragmentPresenter(RecyclerView mRecyclerView, PanelRecycleAdapter mPanelRecycleAdapter, ISelectData mISelectData, Context context) {
super(mRecyclerView, mPanelRecycleAdapter, mISelectData, context);
doTrans();
LayoutManager manager = mRecyclerView.getLayoutManager();
if (manager instanceof GridLayoutManager) {
this.mGridLayoutManager = (GridLayoutManager) manager;
}
}
public X9CameraPrensenter(RecyclerView mRecyclerView, PanelRecycleAdapter mPanelRecycleAdapter, ISelectData mISelectData, Context context) {
super(mRecyclerView, mPanelRecycleAdapter, mISelectData, context);
doTrans();
LayoutManager manager = mRecyclerView.getLayoutManager();
if (manager instanceof GridLayoutManager) {
this.mGridLayoutManager = (GridLayoutManager) manager;
}
}
private int getSpanCount(RecyclerView parent) {
LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
return ((GridLayoutManager) layoutManager).getSpanCount();
}
if (layoutManager instanceof StaggeredGridLayoutManager) {
return ((StaggeredGridLayoutManager) layoutManager).getSpanCount();
}
return -1;
}
private boolean isVertical( RecyclerView parent){
final LayoutManager manager = parent.getLayoutManager();
if(manager instanceof GridLayoutManager){
return ((GridLayoutManager) manager).getOrientation() == GridLayoutManager.VERTICAL;
}else if(manager instanceof StaggeredGridLayoutManager){
return ((StaggeredGridLayoutManager) manager).getOrientation()
== StaggeredGridLayoutManager.VERTICAL;
}else{
return false;
}
}