前言
前前后后经历过大项目、小项目,跨平台,小程序,Nodejs服务等等,目前在做的Rom开发,定制各种手机中的奇葩需求,从应用层到Framework层,再到C++层,再到驱动,最终到Linux,研究过java虚拟机,虽然没研究过ART或者老牌的Dalvik虚拟机,但原理都差不多,并不影响我对android有一个全局的认识,今天我们的主题是架构,其实对架构的理解一定要宏观一点,大到手机操作系统架构,小到代码逻辑设计的架构,一句老话讲的好,也代表了我对架构的整体理解:没有最好的架构,只有最合适的架构。下面我们聊聊,一个好的架构是什么样子的,该怎么去判断呢。
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onKeyEvent(event, 1);
}
//ViewGroup是focused或者设置了具体的大小,则交给它实现
if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS))
== (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) {
//在View中的实现
if (super.dispatchKeyEvent(event)) {
return true;
}
} else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS)
== PFLAG_HAS_BOUNDS) {
//mFocused表示当前ViewGroup中获得焦点或者包含焦点的View(子View)
if (mFocused.dispatchKeyEvent(event)) {
return true;
}
}
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onUnhandledEvent(event, 1);
}
return false;
}
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从上面代码可以看出,子View想要获得焦点,处理KeyEvent,需要设置focusable属性为true。KeyEvent会优先派发给符合条件的ViewGroup处理,而不是子View。mFocused.dispatchKeyEvent(event)
中的dispatchKeyEvent()
可能会迭代调用,因为子View也可能是ViewGroup。
这里看看View中事件分发。
//View
/**
- Dispatch a key event to the next view on the focus path. This path runs
- from the top of the view tree down to the currently focused view. If this
- view has focus, it will dispatch to itself. Otherwise it will dispatch
- the next node down the focus path. This method also fires any key
- listeners.
- @param event The key event to be dispatched.
- @return True if the event was handled, false otherwise.
*/
public boolean dispatchKeyEvent(KeyEvent event) {
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onKeyEvent(event, 0);
}
// Give any attached key listener a first crack at the event.
//noinspection SimplifiableIfStatement
ListenerInfo li = mListenerInfo;
//如果我们给View设置了OnKeyListener且View是ENABLED状态,
//则会回调我们的了OnKeyListener
if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
&& li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) {
return true;
}
//调用KeyEvent.dispatch方法,并将view对象本身作为参数传递进去,view的各种callback方法在这里被触发
if (event.dispatch(this, mAttachInfo != null
? mAttachInfo.mKeyDispatchState : null, this)) {
return true;
}
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
}
return false;
}
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ViewGroup和View的dispatchKeyEvent()
就构成了View层次结构的KeyEvent分发,且总是从树根DecorView开始到具体的View。注意到此处在View不消费KeyEvent会调用KeyEvent.dispatch方法,在Activity也会调用该方法。
//KeyEvent
public final boolean dispatch(Callback receiver, DispatcherState state,
Object target) {
switch (mAction) {
case ACTION_DOWN: {
mFlags &= ~FLAG_START_TRACKING;
//回调Callback对象receiver的onKeyDown函数,上文知道Activity和View都实现Callback
boolean res = receiver.onKeyDown(mKeyCode, this);
if (state != null) {//通常成立
if (res && mRepeatCount == 0 && (mFlags&FLAG_START_TRACKING) != 0) {//判断是否轨迹事件
state.startTracking(this, target);
} else if (isLongPress() && state.isTracking(this)) {
try {
//处理长按事件
if (receiver.onKeyLongPress(mKeyCode, this)) {
state.performedLongPress(this);
res = true;//消费该事件
}
} catch (AbstractMethodError e) {
}
}
}
return res;
}
case ACTION_UP:
if (state != null) {
//reset state的内部状态,也改变了KeyEvent的某些状态
state.handleUpEvent(this);
}
//回调Callback对象receiver的onKeyUp函数
return receiver.onKeyUp(mKeyCode, this);
case ACTION_MULTIPLE:
final int count = mRepeatCount;
final int code = mKeyCode;
if (receiver.onKeyMultiple(code, count, this)) {
return true;
}
if (code != KeyEvent.KEYCODE_UNKNOWN) {
mAction = ACTION_DOWN;
mRepeatCount = 0;
boolean handled = receiver.onKeyDown(code, this);
if (handled) {
mAction = ACTION_UP;
receiver.onKeyUp(code, this);
}
mAction = ACTION_MULTIPLE;
mRepeatCount = count;
return handled;
}
return false;
}
return false;
}
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在上面代码中,可以看到Callback对象的onKeyDown()
,onKeyUp()
,onKeyLongPress()
函数被回调。而Activity和View是Callback接口的实现,因此调用Activity和View对应的方法。
先看看Activity对几个方法的实现:
//Activity
public boolean onKeyDown(int keyCode, KeyEvent event) {
//处理返回键
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (getApplicationInfo().targetSdkVersion
= Build.VERSION_CODES.ECLAIR) {
// 标记追踪这个key event
event.startTracking();
} else {
//手机APP常在Activity重写该方法,
//要求用户双击两次来退出APP,而不是一次就退出APP
onBackPressed();
}
return true;
}
if (mDefaultKeyMode == DEFAULT_KEYS_DISABLE) {
return false;
} else if (mDefaultKeyMode == DEFAULT_KEYS_SHORTCUT) {
Window w = getWindow();
if (w.hasFeature(Window.FEATURE_OPTIONS_PANEL) &&
w.performPanelShortcut(Window.FEATURE_OPTIONS_PANEL, keyCode, event,
Menu.FLAG_ALWAYS_PERFORM_CLOSE)) {
return true;
}
return false;
} else if (keyCode == KeyEvent.KEYCODE_TAB) {
return false;
} else {
boolean clearSpannable = false;
boolean handled;
if ((event.getRepeatCount() != 0) || event.isSystem()) {
clearSpannable = true;
handled = false;
} else {
handled = TextKeyListener.getInstance().onKeyDown(
null, mDefaultKeySsb, keyCode, event);
if (handled && mDefaultKeySsb.length() > 0) {
final String str = mDefaultKeySsb.toString();
clearSpannable = true;
switch (mDefaultKeyMode) {
case DEFAULT_KEYS_DIALER:
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(“tel:” + str));
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
break;
case DEFAULT_KEYS_SEARCH_LOCAL:
startSearch(str, false, null, false);
break;
case DEFAULT_KEYS_SEARCH_GLOBAL:
startSearch(str, false, null, true);
break;
}
}
}
if (clearSpannable) {
mDefaultKeySsb.clear();
mDefaultKeySsb.clearSpans();
Selection.setSelection(mDefaultKeySsb,0);
}
return handled;
}
}
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
return false;
}
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (getApplicationInfo().targetSdkVersion
= Build.VERSION_CODES.ECLAIR) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.isTracking()
&& !event.isCanceled()) {
onBackPressed();
return true;
}
}
return false;
}
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而View中实现:
//View
public boolean onKeyDown(int keyCode, KeyEvent event) {
//KEYCODE_DPAD_CENTER、KEYCODE_ENTER、
//KEYCODE_SPACE、KEYCODE_NUMPAD_ENTER都返回ture,其他返回false
if (KeyEvent.isConfirmKey(keyCode)) {
//当前View是DISABLED状态直接返回false
if ((mViewFlags & ENABLED_MASK) == DISABLED) {
return true;
}
if (event.getRepeatCount() == 0) {
final boolean clickable = (mViewFlags & CLICKABLE) == CLICKABLE
|| (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE;
if (clickable || (mViewFlags & TOOLTIP) == TOOLTIP) {
final float x = getWidth() / 2f;
final float y = getHeight() / 2f;
if (clickable) {
//标记为Pressed,例如根据状态改变背景
setPressed(true, x, y);
}
//长按检测
checkForLongClick(0, x, y);
return true;
}
}
}
return false;
}
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (KeyEvent.isConfirmKey(keyCode)) {
if ((mViewFlags & ENABLED_MASK) == DISABLED) {
return true;
}
if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) {
setPressed(false);
if (!mHasPerformedLongPress) {
removeLongPressCallback();
if (!event.isCanceled()) {
return performClickInternal();
}
}
}
}
return false;
}
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在DecorView的superDispatchKeyEvent()
函数最后一行,如果View层次结构不消费事件,那么会调用ViewRootImpl对象的dispatchUnhandledKeyEvent()
函数,这里主要是将未被消费的KeyEvent分发给注册了处理所有KeyEvent的处理者(监听器)
//ViewRootImpl.java
private final UnhandledKeyManager mUnhandledKeyManager
=new UnhandledKeyManager();
public boolean dispatchUnhandledKeyEvent(KeyEvent event) {
return mUnhandledKeyManager.dispatch(mView, event);
}
boolean dispatch(View root, KeyEvent event) {
if (mDispatched) {
return false;
}
View consumer;
try {
Trace.traceBegin(Trace.TRACE_TAG_VIEW, “UnhandledKeyEvent dispatch”);
mDispatched = true;
//将未处理的KeyEvent进行分发,如果有View消费该事件,则返回该
//View
consumer = root.dispatchUnhandledKeyEvent(event);
//用于追踪该事件
if (event.getAction() == KeyEvent.ACTION_DOWN) {
int keycode = event.getKeyCode();
if (consumer != null && !KeyEvent.isModifierKey(keycode)) {
mCapturedKeys.put(keycode, new WeakReference<>(consumer));
}
}
} finally {
Trace.traceEnd(Trace.TRACE_TAG_VIEW);
}
return consumer != null;
}
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这里的root是DecorView,但从参数的类型来说,这里root.dispatchUnhandledKeyEvent(event)
应该是在View中实现的。
//View.java
View dispatchUnhandledKeyEvent(KeyEvent evt) {
if (onUnhandledKeyEvent(evt)) {
return this;
}
return null;
}
boolean onUnhandledKeyEvent(@NonNull KeyEvent event) {
if (mListenerInfo != null && mListenerInfo.mUnhandledKeyListeners != null) {
//mListenerInfo通过栈的方式保存是否有View设置UnhandledKeyListener,如果有且消费事件,则该DecorView消费该事件
for (int i = mListenerInfo.mUnhandledKeyListeners.size() - 1; i >= 0; --i) {
if (mListenerInfo.mUnhandledKeyListeners.get(i).onUnhandledKeyEvent(this, event)) {
return true;
}
}
}
return false;
}
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通过上文代码可以知道,我们可以在View中添加addOnUnhandledKeyEventListener(OnUnhandledKeyEventListener)
来监听所有未被处理的KeyEvent。会在KeyEvent正常分发未被消费前,且早于Window的Callback被回调。
在DecorView的dispatchKeyEvent()函数,如果View层次结构不消费事件,那么会交给PhoneWindow的onKeyDown()
或onKeyUp()
函数。
//PhoneWindow
protected boolean onKeyDown(int featureId, int keyCode, KeyEvent event) {
final KeyEvent.DispatcherState dispatcher =
mDecor != null ? mDecor.getKeyDispatcherState() : null;
Integer.toHexString(event.getFlags()));
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_UP:
case KeyEvent.KEYCODE_VOLUME_DOWN:
case KeyEvent.KEYCODE_VOLUME_MUTE: {
if (mMediaController != null) {
mMediaController.dispatchVolumeButtonEventAsSystemService(event);
} else {
getMediaSessionManager().dispatchVolumeKeyEventAsSystemService(event,
mVolumeControlStreamType);
}
return true;
}
case KeyEvent.KEYCODE_MEDIA_PLAY:
case KeyEvent.KEYCODE_MEDIA_PAUSE:
case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
case KeyEvent.KEYCODE_MUTE:
case KeyEvent.KEYCODE_HEADSETHOOK:
case KeyEvent.KEYCODE_MEDIA_STOP:
case KeyEvent.KEYCODE_MEDIA_NEXT:
case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
case KeyEvent.KEYCODE_MEDIA_REWIND:
case KeyEvent.KEYCODE_MEDIA_RECORD:
case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD: {
if (mMediaController != null) {
if (mMediaController.dispatchMediaButtonEventAsSystemService(event)) {
return true;
}
}
return false;
}
case KeyEvent.KEYCODE_MENU: {
onKeyDownPanel((featureId < 0) ? FEATURE_OPTIONS_PANEL : featureId, event);
return true;
}
case KeyEvent.KEYCODE_BACK: {
if (event.getRepeatCount() > 0) break;
if (featureId < 0) break;
if (dispatcher != null) {
dispatcher.startTracking(event, this);
}
return true;
}
}
return false;
}
protected boolean onKeyUp(int featureId, int keyCode, KeyEvent event) {
final KeyEvent.DispatcherState dispatcher =
mDecor != null ? mDecor.getKeyDispatcherState() : null;
if (dispatcher != null) {
dispatcher.handleUpEvent(event);
}
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_UP:
case KeyEvent.KEYCODE_VOLUME_DOWN: {
if (mMediaController != null) {
mMediaController.dispatchVolumeButtonEventAsSystemService(event);
} else {
getMediaSessionManager().dispatchVolumeKeyEventAsSystemService(
event, mVolumeControlStreamType);
}
return true;
}
case KeyEvent.KEYCODE_VOLUME_MUTE: {
getMediaSessionManager().dispatchVolumeKeyEventAsSystemService(
event, AudioManager.USE_DEFAULT_STREAM_TYPE);
return true;
}
case KeyEvent.KEYCODE_MEDIA_PLAY:
case KeyEvent.KEYCODE_MEDIA_PAUSE:
case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
case KeyEvent.KEYCODE_MUTE:
case KeyEvent.KEYCODE_HEADSETHOOK:
case KeyEvent.KEYCODE_MEDIA_STOP:
case KeyEvent.KEYCODE_MEDIA_NEXT:
case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
case KeyEvent.KEYCODE_MEDIA_REWIND:
case KeyEvent.KEYCODE_MEDIA_RECORD:
case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD: {
if (mMediaController != null) {
if (mMediaController.dispatchMediaButtonEventAsSystemService(event)) {
return true;
}
}
return false;
}
case KeyEvent.KEYCODE_MENU: {
onKeyUpPanel(featureId < 0 ? FEATURE_OPTIONS_PANEL : featureId,
event);
return true;
}
case KeyEvent.KEYCODE_BACK: {
if (featureId < 0) break;
if (event.isTracking() && !event.isCanceled()) {
if (featureId == FEATURE_OPTIONS_PANEL) {
PanelFeatureState st = getPanelState(featureId, false);
if (st != null && st.isInExpandedMode) {
reopenMenu(true);
return true;
}
}
closePanel(featureId);
return true;
}
break;
}
case KeyEvent.KEYCODE_SEARCH: { /*
if (isNotInstantAppAndKeyguardRestricted()) {
break;
}
if ((getContext().getResources().getConfiguration().uiMode
& Configuration.UI_MODE_TYPE_MASK) == Configuration.UI_MODE_TYPE_WATCH) {
break;
}
if (event.isTracking() && !event.isCanceled()) {
launchDefaultSearch(event);
}
return true;
}
case KeyEvent.KEYCODE_WINDOW: {
if (mSupportsPictureInPicture && !event.isCanceled()) {
getWindowControllerCallback().enterPictureInPictureModeIfPossible();
}
return true;
}
}
return false;
}
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从上面可以看到,PhoneWindow也只对一些物理按键做了处理,如果PhoneWindow和View、Activity都没有消费事件,那么ViewPostImeInputStage对象通过系统算法自动寻找焦点了。
总结一下:
- 监听器的优先级高于Callback的回调,也就是说OnKeyListener的函数优先Callback的onKeyDown等等函数的回调。
- View的Callback回调要早于Activity,Activity的回调早于PhoneWindow。
- 优先级高的消费KeyEvent,优先级低的不再受理该事件。
下面通过时序图对上文KeyEvent做一个整体流程的阐释(虽然不能准备表达意思)
在图表示在KeyEvent在DecorView开始不拦截最终在View的OnKeyListener或Callback对象被消费的过程。
[参考文章](()
系统自动寻找焦点
回到梦开始的地方ViewPostImeInputStage对象的processKeyEvent()
函数的末尾,在自动处理焦点的地方,会调用performFocusNavigation()
函数来寻找下个获得焦点的View。
//ViewRootImpl.java
private boolean performFocusNavigation(KeyEvent event) {
int direction = 0;
//从下面代码可以看出,switch语句在此的主要作用是判断焦点的方向
switch (event.getKeyCode()) {
case KeyEvent.KEYCODE_DPAD_LEFT:
if (event.hasNoModifiers()) {
direction = View.FOCUS_LEFT;
}
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
if (event.hasNoModifiers()) {
direction = View.FOCUS_RIGHT;
}
break;
case KeyEvent.KEYCODE_DPAD_UP:
if (event.hasNoModifiers()) {
direction = View.FOCUS_UP;
}
break;
case KeyEvent.KEYCODE_DPAD_DOWN:
if (event.hasNoModifiers()) {
direction = View.FOCUS_DOWN;
}
break;
case KeyEvent.KEYCODE_TAB:
if (event.hasNoModifiers()) {
direction = View.FOCUS_FORWARD;
} else if (event.hasModifiers(KeyEvent.META_SHIFT_ON)) {
direction = View.FOCUS_BACKWARD;
}
break;
}
if (direction != 0) {
//分析一
//mView在这里是DecorView对象,查找出当前获得焦点的View
View focused = mView.findFocus();
if (focused != null) {
//分析二
//在当前获得焦点View通过指定方向搜索下一个获得焦点的View
View v = focused.focusSearch(direction);
if (v != null && v != focused) {
focused.getFocusedRect(mTempRect);
if (mView instanceof ViewGroup) {
((ViewGroup) mView).offsetDescendantRectToMyCoords(
focused, mTempRect);
((ViewGroup) mView).offsetRectIntoDescendantCoords(
v, mTempRect);
}
if (v.requestFocus(direction, mTempRect)) {
playSoundEffect(SoundEffectConstants
.getContantForFocusDirection(direction));
return true;
}
}
//给DecorView最后一次处理焦点的机会
if (mView.dispatchUnhandledMove(focused, direction)) {
return true;
}
} else {
//如果没有View获得焦点
if (mView.restoreDefaultFocus()) {
return true;
}
}
}
return false;
}
复制代码
在分析一处,通过DecorView对象mView
来查找已获得焦点的View,findFocus()
函数在ViewGroup和View都有实现,而DecorView继承自ViewGroup。这里其实进入了View的层次结果查找已获得焦点的View.
//ViewGroup.java
@Override
public View findFocus() {
if (isFocused()) {
return this;
}
if (mFocused != null) {
//mFocused表示获得焦点的View,有可能是ViewGroup,也有可能是具体的View
return mFocused.findFocus();
}
return null;
}
//View.java
public View findFocus() {
return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null;
}
public boolean isFocused() {
return (mPrivateFlags & PFLAG_FOCUSED) != 0;
}
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对于ViewGroup来说,如果本身获得焦点则直接返回自身即可,否则继续通过mFocused.findFocus()
函数继续查找已获得焦点的View。具体的View是否获得焦点与ViewGroup的判断条件是一致的,判断PFLAG_FOCUSED
标志位,也就是我们调用View的focuesabe=true,如果设置,则返回该View,否则返回null,表示没有View获得焦点。
假设寻找到了已获得焦点的View,那么下面就是寻找下一个获得焦点的View。也就是ViewPostImeInputStage对象的performFocusNavigation()
函数分析二的代码。由于focused
对象有可能是ViewGroup,也有可能是具体的View。一起看看它两的实现。
//View
//具体View的实现非常的简单,如果有父视图ViewGroup,则在俯视图在寻找,
//否则返回null
public View focusSearch(@FocusRealDirection int direction) {
if (mParent != null) {
return mParent.focusSearch(this, direction);
} else {
return null;
}
}
//ViewGroup.java
@Override
public View focusSearch(View focused, int direction) {
if (isRootNamespace()) { //判断当前ViewGroup是否顶层View,即DecorView
//调用FocusFinder实例findNextFocus进行查找
return FocusFinder.getInstance().findNextFocus(this, focused, direction);
} else if (mParent != null) {
//递归到顶层View
return mParent.focusSearch(focused, direction);
}
return null;
}
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通过递归方式,从内到外,到布局最外层View,准确说是ViewGroup。然后调用FocusFinder的实例方法findNextFocus()来寻找下一个获得焦点的View。 FocusFinder类通过算法,根据当前获得焦点的View和按键方向来寻找下一个获得焦点的View。
//FocusFinder.java
public final View findNextFocus(ViewGroup root, View focused, int direction) {
return findNextFocus(root, focused, null, direction);
}
private View findNextFocus(ViewGroup root, View focused, Rect focusedRect, int direction) {
View next = null;
ViewGroup effectiveRoot = getEffectiveRoot(root, focused);
最后
希望本文对你有所启发,有任何面试上的建议也欢迎留言分享给大家。
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ection) {
return findNextFocus(root, focused, null, direction);
}
private View findNextFocus(ViewGroup root, View focused, Rect focusedRect, int direction) {
View next = null;
ViewGroup effectiveRoot = getEffectiveRoot(root, focused);
最后
希望本文对你有所启发,有任何面试上的建议也欢迎留言分享给大家。
好了,今天的分享就到这里,如果你对在面试中遇到的问题,或者刚毕业及工作几年迷茫不知道该如何准备面试并突破现状提升自己,对于自己的未来还不够了解不知道给如何规划,来看看同行们都是如何突破现状,怎么学习的,来吸收他们的面试以及工作经验完善自己的之后的面试计划及职业规划。
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好了~如果你看到了这里,觉得文章写得不错就给个赞呗?如果你觉得那里值得改进的,请给我留言。一定会认真查询,修正不足。谢谢。
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为什么某些人会一直比你优秀,是因为他本身就很优秀还一直在持续努力变得更优秀,而你是不是还在满足于现状内心在窃喜!希望读到这的您能点个小赞和关注下我,以后还会更新技术干货,谢谢您的支持!