我有一个PopupWindow，在我点击ImageButton后会打开：
// Get the [x, y]-location of the ImageButton
int[] loc = new int[2];
myImageButton.getLocationOnScreen(loc);
// Inflate the tag_popup.xml
LinearLayout viewGroup = (LinearLayout)findViewById(R.id.tagPopupLayout);
LayoutInflater layoutInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View layout = layoutInflater.inflate(R.layout.tag_popup, viewGroup);
// Create the PopupWindow
myPopupWindow = new PopupWindow(ChecklistActivity.this);
myPopupWindow.setContentView(layout);
myPopupWindow.setWindowLayoutMode(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
myPopupWindow.setFocusable(true);
myPopupWindow.setOutsideTouchable(false);
// Clear the default translucent background and use a white background instead
myPopupWindow.setBackgroundDrawable(new ColorDrawable(android.graphics.Color.WHITE));
// Set the content of the TextViews, EditTexts and Buttons of the PopupWindow
setPopupContent(...);
// Displaying the Pop-up at the specified location
myPopupWindow.showAtLocation(layout, Gravity.NO_GRAVITY, 0, loc[1]);
因为Gravity.NO_GRAVITY，PopupWindow将显示在Window的边框内。一切都在我的模拟器上按预期工作，但当我在我的Nexus 7平板电脑上运行时，它部分由设备的底部状态栏覆盖。
我该如何解决这个问题？我应该在Gravity.NO_GRAVITY发生后以某种方式获取当前PopupWindow的位置，然后更改y位置以添加设备的状态栏的高度，然后重新绘制它？ （会尝试这个，但我认为拥有正确的位置而不是重新绘制它是一个更好的解决方案..）
答案 0 :(得分：0)
这就是我想出的：
我们拥有什么：
oldY）我们的计算方法：
screenHeight - statusBarHeight - popupHeight）然后我们检查：
oldY是否大于maxY newY将是maxY，我们会重新绘制PopupWindow。如果不是这种情况，则意味着我们什么也不做，只需使用oldY作为正确的Y-postition。 注意1：我为此制作了代码，但在调试过程中，我的模拟器和Nexus平板电脑上的状态栏的高度为0，所以只需使用screenHeight - popupHeight对我来说足够了。尽管如此，如果应用程序将来安装在另一台平板电脑上，我还是会在我的Config文件中包含用于计算Bottom Status Bar Height底部状态栏高度的代码来启用/禁用此功能。
这是在代码中，我刚刚添加了上面的描述，以明确我用来解决这个问题的方法：
// Get the [x, y]-location of the ImageButton
int[] loc = new int[2];
myImageButton.getLocationOnScreen(loc);
// Inflate the popup.xml
LinearLayout viewGroup = (LinearLayout)findViewById(R.id.popup_layout);
LayoutInflater layoutInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View layout = layoutInflater.inflate(R.layout.popup, viewGroup);
// Create the PopupWindow
myPopupWindow = new PopupWindow(ChecklistActivity.this);
myPopupWindow.setContentView(layout);
myPopupWindow.setWindowLayoutMode(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
... // Some more stuff with the PopupWindow's content
// Clear the default translucent background and use a white background instead
myPopupWindow.setBackgroundDrawable(new ColorDrawable(android.graphics.Color.WHITE));
// Displaying the Pop-up at the specified location
myPopupWindow.showAtLocation(layout, Gravity.NO_GRAVITY, 0, loc[1]);
// Because the PopupWindow is displayed below the Status Bar on some Device's,
// we recalculate it's height:
// Wait until the PopupWindow is done loading by using an OnGlobalLayoutListener:
final int[] finalLoc = loc;
if(layout.getViewTreeObserver().isAlive()){
layout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
// This will be called once the layout is finished, prior to displaying it
// So we can change the y-position of the PopupWindow just before that
@Override
public void onGlobalLayout() {
// Get the PopupWindow's height
int popupHeight = layout.getHeight();
// Get the Status Bar's height
int statusBarHeight = 0;
// Enable/Disable this in the Config-file
// This isn't needed for the Emulator, nor the Nexus 7 tablet
// Since the calculated Status Bar Height is 0 with both of them
// and the PopupWindow is displayed at its correct position
if(D.WITH_STATUS_BAR_CHECK){
// Check whether the Status bar is at the top or bottom
Rect r = new Rect();
Window w = ChecklistActivity.this.getWindow();
w.getDecorView().getWindowVisibleDisplayFrame(r);
int barHeightCheck = r.top;
// If the barHeightCheck is 0, it means our Status Bar is
// displayed at the bottom and we need to get it's height
// (If the Status Bar is displayed at the top, we use 0 as Status Bar Height)
if(barHeightCheck == 0){
int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0)
statusBarHeight = getResources().getDimensionPixelSize(resourceId);
}
}
// Get the Screen's height:
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int screenHeight = dm.heightPixels;
// Get the old Y-position
int oldY = finalLoc[1];
// Get the max Y-position to be within Window boundaries
int maxY = screenHeight - statusBarHeight - popupHeight;
// Check if the old Y-position is outside the Window boundary
if(oldY > maxY){
// If it is, use the max Y-position as new Y-position,
// and re-draw the PopupWindow
myPopupWindow.dismiss();
myPopupWindow.showAtLocation(layout, Gravity.NO_GRAVITY, 0, maxY);
}
// Since we don't want onGlobalLayout to continue forever, we remove the Listener here again
layout.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
});
}
注意2：我已在此行将tag_popup本身设置为width = match_parent; height = wrap_content：
myPopupWindow.setWindowLayoutMode(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
此弹出窗口的主要布局为width = match_parent; height = match_parent：
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE xml>
<!-- The DOCTYPE above is added to get rid of the following warning:
"No grammar constraints (DTD or XML schema) detected for the document." -->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/popup_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@layout/tag_shape"
android:padding="@dimen/default_margin">
... <!-- Popup's Content (EditTexts, Spinner, TextViews, Button, etc.) -->
</RelativeLayout>
注意3： 我的应用程序被强制保持在纵向模式。我没有在横向模式下测试它，但我假设应该进行一些修改（但不确定）。编辑：经过测试，它也可以在我的两个设备上以横向模式工作。我不知道这是否也适用于横向模式并且启用了底栏高度。
花了我一些时间，但它现在有效。希望他们将来修复PopupWindow的Gravity，所以它永远不会低于状态栏，除非程序员自己想要并更改PopupWindow的设置。使事情变得更容易..