重慶分公司
重慶分公司
public PopupWindow (Context context)
public PopupWindow(View contentView)
public PopupWindow(int width, int height)
public PopupWindow(View contentView, int width, int height)
public PopupWindow(View contentView, int width, int height, boolean focusable)showAsDropDown(View anchor)：相對(duì)某個(gè)控件的位置（正左下方），無(wú)偏移
showAsDropDown(View anchor, int xoff, int yoff)：相對(duì)某個(gè)控件的位置，有偏移
showAtLocation(View parent, int gravity, int x, int y)：相對(duì)于父控件的位置（例如正中央Gravity.CENTER，下方Gravity.BOTTOM等），可以設(shè)置偏移或無(wú)偏移具體如下所示
//創(chuàng)建對(duì)象
PopupWindow popupWindow = new PopupWindow(this);
View inflate = LayoutInflater.from(this).inflate(R.layout.view_pop_custom, null);
//設(shè)置view布局
popupWindow.setContentView(inflate);
popupWindow.setWidth(LinearLayout.LayoutParams.WRAP_CONTENT);
popupWindow.setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);
//設(shè)置動(dòng)畫的方法
popupWindow.setAnimationStyle(R.style.BottomDialog);
//設(shè)置PopUpWindow的焦點(diǎn)，設(shè)置為true之后，PopupWindow內(nèi)容區(qū)域，才可以響應(yīng)點(diǎn)擊事件
popupWindow.setTouchable(true);
//設(shè)置背景透明
popupWindow.setBackgroundDrawable(new ColorDrawable(0x00000000));
//點(diǎn)擊空白處的時(shí)候讓PopupWindow消失
popupWindow.setOutsideTouchable(true);
// true時(shí)，點(diǎn)擊返回鍵先消失 PopupWindow
// 但是設(shè)置為true時(shí)setOutsideTouchable，setTouchable方法就失效了（點(diǎn)擊外部不消失，內(nèi)容區(qū)域也不響應(yīng)事件）
// false時(shí)PopupWindow不處理返回鍵，默認(rèn)是false
popupWindow.setFocusable(false);
//設(shè)置dismiss事件
popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
@Override
public void onDismiss() {
}
});
boolean showing = popupWindow.isShowing();
if (!showing){
//show，并且可以設(shè)置位置
popupWindow.showAsDropDown(mTv1);
}先看問(wèn)題代碼，下面這個(gè)不會(huì)出現(xiàn)彈窗，思考：為什么？
PopupWindow popupWindow = new PopupWindow(this);
View inflate = LayoutInflater.from(this).inflate(R.layout.view_pop_custom, null);
popupWindow.setContentView(inflate);
popupWindow.setAnimationStyle(R.style.BottomDialog);
popupWindow.showAsDropDown(mTv1);首先先來(lái)看看源碼
可以看出，先判斷是否show，如果沒(méi)有showing的話，則進(jìn)行contentView賦值，如果mWindowManager為null，則取獲取mWindowManager，這個(gè)很重要。最后便是根據(jù)SDK版本而不是在構(gòu)造函數(shù)中設(shè)置附加InDecor的默認(rèn)設(shè)置，因?yàn)闃?gòu)造函數(shù)中可能沒(méi)有上下文對(duì)象。我們只想在這里設(shè)置默認(rèn)，如果應(yīng)用程序尚未設(shè)置附加InDecor。
public void setContentView(View contentView) {
//判斷是否show，如果已經(jīng)show，則返回
if (isShowing()) {
return;
}
//賦值
mContentView = contentView;
if (mContext == null && mContentView != null) {
mContext = mContentView.getContext();
}
if (mWindowManager == null && mContentView != null) {
mWindowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
}
//在這里根據(jù)SDK版本而不是在構(gòu)造函數(shù)中設(shè)置附加InDecor的默認(rèn)設(shè)置，因?yàn)闃?gòu)造函數(shù)中可能沒(méi)有上下文對(duì)象。我們只想在這里設(shè)置默認(rèn)，如果應(yīng)用程序尚未設(shè)置附加InDecor。
if (mContext != null && !mAttachedInDecorSet) {
setAttachedInDecor(mContext.getApplicationInfo().targetSdkVersion
>= Build.VERSION_CODES.LOLLIPOP_MR1);
}}
public void setAttachedInDecor(boolean enabled) {
mAttachedInDecor = enabled;
mAttachedInDecorSet = true;
}先來(lái)看一下showAsDropDown(View anchor)部分代碼
public void showAsDropDown(View anchor) {
showAsDropDown(anchor, 0, 0);
}//主要看這個(gè)方法
//注意啦：關(guān)于更多內(nèi)容，可以參考我的博客大匯總：https://github.com/yangchong211/YCBlogs
public void showAsDropDown(View anchor, int xoff, int yoff, int gravity) {
if (isShowing() || mContentView == null) {
return;
}
TransitionManager.endTransitions(mDecorView);
//下面單獨(dú)講
//https://github.com/yangchong211/YCBlogs
attachToAnchor(anchor, xoff, yoff, gravity);
mIsShowing = true;
mIsDropdown = true;
//通過(guò)createPopupLayoutParams方法創(chuàng)建和初始化LayoutParams
final WindowManager.LayoutParams p = createPopupLayoutParams(anchor.getWindowToken());
preparePopup(p);
final boolean aboveAnchor = findDropDownPosition(anchor, p, xoff, yoff,
p.width, p.height, gravity);
updateAboveAnchor(aboveAnchor);
p.accessibilityIdOfAnchor = (anchor != null) ? anchor.getAccessibilityViewId() : -1;
invokePopup(p);}
接著來(lái)看看attachToAnchor(anchor, xoff, yoff, gravity)源碼
關(guān)于四種引用的深入介紹可以參考我的這邊文章：01.四種引用比較與源碼分析
private void attachToAnchor(View anchor, int xoff, int yoff, int gravity) {
detachFromAnchor();
final ViewTreeObserver vto = anchor.getViewTreeObserver();
if (vto != null) {
vto.addOnScrollChangedListener(mOnScrollChangedListener);
}
final View anchorRoot = anchor.getRootView();
anchorRoot.addOnAttachStateChangeListener(mOnAnchorRootDetachedListener);
mAnchor = new WeakReference<>(anchor);
mAnchorRoot = new WeakReference<>(anchorRoot);
mIsAnchorRootAttached = anchorRoot.isAttachedToWindow();
mAnchorXoff = xoff;
mAnchorYoff = yoff;
mAnchoredGravity = gravity;
}
接著看看dismissImmediate(View decorView, ViewGroup contentHolder, View contentView)源碼
第三步，講mDecorView，mBackgroundView置為null
private void dismissImmediate(View decorView, ViewGroup contentHolder, View contentView) {
// If this method gets called and the decor view doesn't have a parent,
// then it was either never added or was already removed. That should
// never happen, but it's worth checking to avoid potential crashes.
if (decorView.getParent() != null) {
mWindowManager.removeViewImmediate(decorView);
}
if (contentHolder != null) {
contentHolder.removeView(contentView);
}
// This needs to stay until after all transitions have ended since we
// need the reference to cancel transitions in preparePopup().
mDecorView = null;
mBackgroundView = null;
mIsTransitioningToDismiss = false;
}通過(guò)createDecorView(View contentView)方法可以知道，是PopupDecorView直接new出來(lái)的布局對(duì)象decorView，外面包裹了一層PopupDecorView，這里的PopupDecorView也是我們自定義的FrameLayout的子類，然后看一下里面的代碼：
private class PopupDecorView extends FrameLayout {
private TransitionListenerAdapter mPendingExitListener;
public PopupDecorView(Context context) {
super(context);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
final int x = (int) event.getX();
final int y = (int) event.getY();
if ((event.getAction() == MotionEvent.ACTION_DOWN)
&& ((x < 0) || (x >= getWidth()) || (y < 0) || (y >= getHeight()))) {
dismiss();
return true;
} else if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
dismiss();
return true;
} else {
return super.onTouchEvent(event);
}
}
}new CustomPopupWindow.PopupWindowBuilder(this)
//.setView(R.layout.pop_layout)
.setView(contentView)
.setFocusable(true)
//彈出popWindow時(shí)，背景是否變暗
.enableBackgroundDark(true)
//控制亮度
.setBgDarkAlpha(0.7f)
.setOutsideTouchable(true)
.setAnimationStyle(R.style.popWindowStyle)
.setOnDissmissListener(new PopupWindow.OnDismissListener() {
@Override
public void onDismiss() {
//對(duì)話框銷毀時(shí)
}
})
.create()
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