Java ViewHolder中类型视图的字段itemView引用了什么？
我正在试图找出字段Java ViewHolder中类型视图的字段itemView引用了什么？,java,android,Java,Android,我正在试图找出字段itemView实际上是什么。下面是我从文档中提取的代码片段 public abstract static class ViewHolder { @NonNull public final View itemView; // others removed for simplicity } 如果我们扩展了ViewHolder类，因为我们还需要指定一些从View派生的类型字段来为每个列表项保存我们自己的小部件，那么很明显，itemVi
itemViewpublic abstract static class ViewHolder {
@NonNull
public final View itemView;
// others removed for simplicity
}
ViewHolderViewitemViewitemViewRecyclerViewlist\u item\u layout.xmlViewHolderpublic abstract static class ViewHolder {
@NonNull
public final View itemView;
WeakReference<RecyclerView> mNestedRecyclerView;
int mPosition = -1;
int mOldPosition = -1;
long mItemId = -1L;
int mItemViewType = -1;
int mPreLayoutPosition = -1;
RecyclerView.ViewHolder mShadowedHolder = null;
RecyclerView.ViewHolder mShadowingHolder = null;
static final int FLAG_BOUND = 1;
static final int FLAG_UPDATE = 2;
static final int FLAG_INVALID = 4;
static final int FLAG_REMOVED = 8;
static final int FLAG_NOT_RECYCLABLE = 16;
static final int FLAG_RETURNED_FROM_SCRAP = 32;
static final int FLAG_IGNORE = 128;
static final int FLAG_TMP_DETACHED = 256;
static final int FLAG_ADAPTER_POSITION_UNKNOWN = 512;
static final int FLAG_ADAPTER_FULLUPDATE = 1024;
static final int FLAG_MOVED = 2048;
static final int FLAG_APPEARED_IN_PRE_LAYOUT = 4096;
static final int PENDING_ACCESSIBILITY_STATE_NOT_SET = -1;
static final int FLAG_BOUNCED_FROM_HIDDEN_LIST = 8192;
static final int FLAG_SET_A11Y_ITEM_DELEGATE = 16384;
int mFlags;
private static final List<Object> FULLUPDATE_PAYLOADS = Collections.emptyList();
List<Object> mPayloads = null;
List<Object> mUnmodifiedPayloads = null;
private int mIsRecyclableCount = 0;
RecyclerView.Recycler mScrapContainer = null;
boolean mInChangeScrap = false;
private int mWasImportantForAccessibilityBeforeHidden = 0;
@VisibleForTesting
int mPendingAccessibilityState = -1;
RecyclerView mOwnerRecyclerView;
public ViewHolder(@NonNull View itemView) {
if (itemView == null) {
throw new IllegalArgumentException("itemView may not be null");
} else {
this.itemView = itemView;
}
}
void flagRemovedAndOffsetPosition(int mNewPosition, int offset, boolean applyToPreLayout) {
this.addFlags(8);
this.offsetPosition(offset, applyToPreLayout);
this.mPosition = mNewPosition;
}
void offsetPosition(int offset, boolean applyToPreLayout) {
if (this.mOldPosition == -1) {
this.mOldPosition = this.mPosition;
}
if (this.mPreLayoutPosition == -1) {
this.mPreLayoutPosition = this.mPosition;
}
if (applyToPreLayout) {
this.mPreLayoutPosition += offset;
}
this.mPosition += offset;
if (this.itemView.getLayoutParams() != null) {
((RecyclerView.LayoutParams)this.itemView.getLayoutParams()).mInsetsDirty = true;
}
}
void clearOldPosition() {
this.mOldPosition = -1;
this.mPreLayoutPosition = -1;
}
void saveOldPosition() {
if (this.mOldPosition == -1) {
this.mOldPosition = this.mPosition;
}
}
boolean shouldIgnore() {
return (this.mFlags & 128) != 0;
}
/** @deprecated */
@Deprecated
public final int getPosition() {
return this.mPreLayoutPosition == -1 ? this.mPosition : this.mPreLayoutPosition;
}
public final int getLayoutPosition() {
return this.mPreLayoutPosition == -1 ? this.mPosition : this.mPreLayoutPosition;
}
public final int getAdapterPosition() {
return this.mOwnerRecyclerView == null ? -1 : this.mOwnerRecyclerView.getAdapterPositionFor(this);
}
public final int getOldPosition() {
return this.mOldPosition;
}
public final long getItemId() {
return this.mItemId;
}
public final int getItemViewType() {
return this.mItemViewType;
}
boolean isScrap() {
return this.mScrapContainer != null;
}
void unScrap() {
this.mScrapContainer.unscrapView(this);
}
boolean wasReturnedFromScrap() {
return (this.mFlags & 32) != 0;
}
void clearReturnedFromScrapFlag() {
this.mFlags &= -33;
}
void clearTmpDetachFlag() {
this.mFlags &= -257;
}
void stopIgnoring() {
this.mFlags &= -129;
}
void setScrapContainer(RecyclerView.Recycler recycler, boolean isChangeScrap) {
this.mScrapContainer = recycler;
this.mInChangeScrap = isChangeScrap;
}
boolean isInvalid() {
return (this.mFlags & 4) != 0;
}
boolean needsUpdate() {
return (this.mFlags & 2) != 0;
}
boolean isBound() {
return (this.mFlags & 1) != 0;
}
boolean isRemoved() {
return (this.mFlags & 8) != 0;
}
boolean hasAnyOfTheFlags(int flags) {
return (this.mFlags & flags) != 0;
}
boolean isTmpDetached() {
return (this.mFlags & 256) != 0;
}
boolean isAdapterPositionUnknown() {
return (this.mFlags & 512) != 0 || this.isInvalid();
}
void setFlags(int flags, int mask) {
this.mFlags = this.mFlags & ~mask | flags & mask;
}
void addFlags(int flags) {
this.mFlags |= flags;
}
void addChangePayload(Object payload) {
if (payload == null) {
this.addFlags(1024);
} else if ((this.mFlags & 1024) == 0) {
this.createPayloadsIfNeeded();
this.mPayloads.add(payload);
}
}
private void createPayloadsIfNeeded() {
if (this.mPayloads == null) {
this.mPayloads = new ArrayList();
this.mUnmodifiedPayloads = Collections.unmodifiableList(this.mPayloads);
}
}
void clearPayload() {
if (this.mPayloads != null) {
this.mPayloads.clear();
}
this.mFlags &= -1025;
}
List<Object> getUnmodifiedPayloads() {
if ((this.mFlags & 1024) == 0) {
return this.mPayloads != null && this.mPayloads.size() != 0 ? this.mUnmodifiedPayloads : FULLUPDATE_PAYLOADS;
} else {
return FULLUPDATE_PAYLOADS;
}
}
void resetInternal() {
this.mFlags = 0;
this.mPosition = -1;
this.mOldPosition = -1;
this.mItemId = -1L;
this.mPreLayoutPosition = -1;
this.mIsRecyclableCount = 0;
this.mShadowedHolder = null;
this.mShadowingHolder = null;
this.clearPayload();
this.mWasImportantForAccessibilityBeforeHidden = 0;
this.mPendingAccessibilityState = -1;
RecyclerView.clearNestedRecyclerViewIfNotNested(this);
}
void onEnteredHiddenState(RecyclerView parent) {
if (this.mPendingAccessibilityState != -1) {
this.mWasImportantForAccessibilityBeforeHidden = this.mPendingAccessibilityState;
} else {
this.mWasImportantForAccessibilityBeforeHidden = ViewCompat.getImportantForAccessibility(this.itemView);
}
parent.setChildImportantForAccessibilityInternal(this, 4);
}
void onLeftHiddenState(RecyclerView parent) {
parent.setChildImportantForAccessibilityInternal(this, this.mWasImportantForAccessibilityBeforeHidden);
this.mWasImportantForAccessibilityBeforeHidden = 0;
}
public String toString() {
StringBuilder sb = new StringBuilder("ViewHolder{" + Integer.toHexString(this.hashCode()) + " position=" + this.mPosition + " id=" + this.mItemId + ", oldPos=" + this.mOldPosition + ", pLpos:" + this.mPreLayoutPosition);
if (this.isScrap()) {
sb.append(" scrap ").append(this.mInChangeScrap ? "[changeScrap]" : "[attachedScrap]");
}
if (this.isInvalid()) {
sb.append(" invalid");
}
if (!this.isBound()) {
sb.append(" unbound");
}
if (this.needsUpdate()) {
sb.append(" update");
}
if (this.isRemoved()) {
sb.append(" removed");
}
if (this.shouldIgnore()) {
sb.append(" ignored");
}
if (this.isTmpDetached()) {
sb.append(" tmpDetached");
}
if (!this.isRecyclable()) {
sb.append(" not recyclable(" + this.mIsRecyclableCount + ")");
}
if (this.isAdapterPositionUnknown()) {
sb.append(" undefined adapter position");
}
if (this.itemView.getParent() == null) {
sb.append(" no parent");
}
sb.append("}");
return sb.toString();
}
public final void setIsRecyclable(boolean recyclable) {
this.mIsRecyclableCount = recyclable ? this.mIsRecyclableCount - 1 : this.mIsRecyclableCount + 1;
if (this.mIsRecyclableCount < 0) {
this.mIsRecyclableCount = 0;
Log.e("View", "isRecyclable decremented below 0: unmatched pair of setIsRecyable() calls for " + this);
} else if (!recyclable && this.mIsRecyclableCount == 1) {
this.mFlags |= 16;
} else if (recyclable && this.mIsRecyclableCount == 0) {
this.mFlags &= -17;
}
}
public final boolean isRecyclable() {
return (this.mFlags & 16) == 0 && !ViewCompat.hasTransientState(this.itemView);
}
boolean shouldBeKeptAsChild() {
return (this.mFlags & 16) != 0;
}
boolean doesTransientStatePreventRecycling() {
return (this.mFlags & 16) == 0 && ViewCompat.hasTransientState(this.itemView);
}
boolean isUpdated() {
return (this.mFlags & 2) != 0;
}
}
公共抽象静态类ViewHolder{
@非空
公共最终视图项目视图；
WeakReference mNestedRecyclerView；
int-mPosition=-1；
int mOldPosition=-1；
长斜接=1L；
int-mItemViewType=-1；
int-mPreLayoutPosition=-1；
RecyclerView.ViewHolder mShadowedHolder=null；
RecyclerView.ViewHolder mShadowingHolder=null；
静态最终整数标志_BOUND=1；
静态最终整数标志_UPDATE=2；
静态最终整数标志_无效=4；
静态最终整型标志_移除=8；
静态最终整数标志不可回收=16；
静态最终整数标志\u从\u废料返回\u=32；
静态最终整数标志_IGNORE=128；
静态最终int标志\u TMP\u分离=256；
静态最终整数标志\适配器\位置\未知=512；
静态最终int标志\u适配器\u FULLUPDATE=1024；
静态最终整数标志_MOVED=2048；
静态最终整型标志\u在\u PRE\u布局中出现\u=4096；
静态最终整型挂起\u可访问性\u状态\u非\u集=-1；
静态最终整数标志从隐藏列表中反弹=8192；
静态最终整型标志集项目委托=16384；
int-mFlags；
私有静态最终列表FULLUPDATE_PAYLOADS=Collections.emptyList（）；
列表mpailoads=null；
列表mundModifiedPayLoads=null；
私有整数可回收错误计数=0；
RecyclerView.Recycler mScrapContainer=null；
布尔值mInChangeScrap=false；
private int mWasImportantForAccessibilityBeforeHidden=0；
@可视性测试
int mPendingAccessibilityState=-1；
RecyclerView割草机RecyclerView；
公共视图持有者（@NonNull View itemView）{
如果（itemView==null）{
抛出新的IllegalArgumentException（“itemView可能不为null”）；
}否则{
this.itemView=itemView；
}
}
void flagRemovedAndOffsetPosition（整数mNewPosition、整数偏移、布尔applyToPreLayout）{
这是addFlags（8）；
此偏移位置（偏移，应用预布局）；
this.mPosition=mNewPosition；
}
void offsetPosition（整数偏移，布尔applyToPreLayout）{
if（this.mOldPosition==-1）{
this.mOldPosition=this.mPosition；
}
if（this.mPreLayoutPosition==-1）{
this.mPreLayoutPosition=this.mPreLayoutPosition；
}
如果（应用预布局）{
此.mPreLayoutPosition+=偏移量；
}
此.mPosition+=偏移量；
if（this.itemView.getLayoutParams（）！=null）{
（（RecyclerView.LayoutParams）this.itemView.getLayoutParams（））.mInsetsDirty=true；
}
}
void clearloldposition（）{
this.mOldPosition=-1；
this.mPreLayoutPosition=-1；
}
void saveOldPosition（）{
if（this.mOldPosition==-1）{
this.mOldPosition=this.mPosition；
}
}
布尔shouldinore（）{
返回（this.mFlags&128）！=0；
}
/**@弃用*/
@不赞成
公共最终int getPosition（）{
返回this.mPreLayoutPosition==-1？this.mPreLayoutPosition:this.mPreLayoutPosition；
}
public final int getLayoutPosition（）{
返回this.mPreLayoutPosition==-1？this.mPreLayoutPosition:this.mPreLayoutPosition；
}
公共最终整型getAdapterPosition（）{
返回this.mOwnerRecyclerView==null？-1:this.mOwnerRecyclerView.getAdapterPositionFor（this）；
}
公共最终整数getOldPosition（）{
返回此.mOldPosition；
}
公共最终长getItemId（）{
把这个还给我；
}
public final int getItemViewType（）{
返回此.mItemViewType；
}
布尔isScrap（）{
返回this.mScrapContainer！=null；
}
撤销联合国安理会决议（）{
this.mScrapContainer.uncapview（this）；
}
布尔值是从废料（）返回的{
返回（this.mFlags&32）！=0；
}
作废clearReturnedFromScrapFlag（）{
这个.mFlags&=-33；
}
void clearTmpDetachFlag（）{
这个.mFlags&=-257；
}
void stop忽略（）{
这个.mFlags&=-129；
}
void setScrapContainer（RecyclerView.Recycler Recycler，布尔值IsChangeScrape）{
this.mScrapContainer=回收商；
this.mInChangeScrap=isChangeScrap；
}
布尔值isInvalid（）{
返回（this.mFlags&4）！=0；
}
布尔值needsUpdate（）{
返回值（this.mFlags&2）！=0；
}
布尔isBound（）{
返回（this.mFlags&1）！=0；
}
布尔值isRemoved（）{
返回（this.mFlags&8）！=0；
}
布尔hasanyoff标志（int标志）{
返回（this.mFlags&flags）！=0；
}
布尔值（）{
返回（this.mFlags&256）！
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
TextView v = (TextView) LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_text_view, parent, false);
...
MyViewHolder vh = new MyViewHolder(v);
return vh;
}