如何在 android 中获取弹出菜单的高度和宽度?
How to get height and width of a popup menu in android?
我有一个弹出菜单,我只想获取它的尺寸以在我的 showCaseView 中用于我的导览。我无法在任何地方找到确定这些尺寸(高度和宽度)的方法。
private void initPopUpMenu() {
PopupMenu popupMenu = new PopupMenu(TimelineActivity.this, menuIcon);
popupMenu.getMenuInflater().inflate(R.menu.menu_timeline, popupMenu.getMenu());
}
如何从此结构中检索宽度和高度?这是一个包含 5 个项目的简单菜单资源
最佳解决方案是使用 ListPopupWindow
而不是 PopupMenu
,后者具有 getWidth()
和 getHeight()
方法来获取其维度。但是,如果你真的要使用PopupMenu
,可能的tricky方法是使用Reflection
来访问其内部的ListView
,因为PopupMenu
中没有可用的方法来访问内容视图。
用法:
PopupMenu popupMenu = initPopUpMenu();
popupMenu.show();
ListView listView = getPopupMenuListView(popupMenu);
androidx.core.view.ViewKt.doOnLayout(listView, view -> {
System.out.println("PopupMenu Size: " + view.getWidth() + " x " + view.getHeight());
return null;
});
方法:
private PopupMenu initPopUpMenu() {
PopupMenu popupMenu = new PopupMenu(TimelineActivity.this, menuIcon);
popupMenu.getMenuInflater().inflate(R.menu.menu_timeline, popupMenu.getMenu());
return popupMenu;
}
private ListView getPopupMenuListView(PopupMenu popupMenu) {
Method getMenuListViewMethod = null;
try {
getMenuListViewMethod = PopupMenu.class.getDeclaredMethod("getMenuListView");
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
ListView listView = null;
if (getMenuListViewMethod != null) {
getMenuListViewMethod.setAccessible(true);
try {
listView = (ListView) getMenuListViewMethod.invoke(popupMenu);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
return listView;
}
build.gradle:
android {
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.3.0'
}
结果:
I/System.out: PopupMenu Size: 539 x 660
您可以将自定义布局与 PopupWindow
一起使用,然后对其进行测量
val popupWindow = PopupWindow(context)
popupWindow.contentView = View.inflate(context, R.layout.my_popup, null).apply {
measure(
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)
)
measuredWidth// <-- here is width
measuredHeight// <-- here is height
}
我有一个弹出菜单,我只想获取它的尺寸以在我的 showCaseView 中用于我的导览。我无法在任何地方找到确定这些尺寸(高度和宽度)的方法。
private void initPopUpMenu() {
PopupMenu popupMenu = new PopupMenu(TimelineActivity.this, menuIcon);
popupMenu.getMenuInflater().inflate(R.menu.menu_timeline, popupMenu.getMenu());
}
如何从此结构中检索宽度和高度?这是一个包含 5 个项目的简单菜单资源
最佳解决方案是使用 ListPopupWindow
而不是 PopupMenu
,后者具有 getWidth()
和 getHeight()
方法来获取其维度。但是,如果你真的要使用PopupMenu
,可能的tricky方法是使用Reflection
来访问其内部的ListView
,因为PopupMenu
中没有可用的方法来访问内容视图。
用法:
PopupMenu popupMenu = initPopUpMenu();
popupMenu.show();
ListView listView = getPopupMenuListView(popupMenu);
androidx.core.view.ViewKt.doOnLayout(listView, view -> {
System.out.println("PopupMenu Size: " + view.getWidth() + " x " + view.getHeight());
return null;
});
方法:
private PopupMenu initPopUpMenu() {
PopupMenu popupMenu = new PopupMenu(TimelineActivity.this, menuIcon);
popupMenu.getMenuInflater().inflate(R.menu.menu_timeline, popupMenu.getMenu());
return popupMenu;
}
private ListView getPopupMenuListView(PopupMenu popupMenu) {
Method getMenuListViewMethod = null;
try {
getMenuListViewMethod = PopupMenu.class.getDeclaredMethod("getMenuListView");
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
ListView listView = null;
if (getMenuListViewMethod != null) {
getMenuListViewMethod.setAccessible(true);
try {
listView = (ListView) getMenuListViewMethod.invoke(popupMenu);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
return listView;
}
build.gradle:
android {
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.3.0'
}
结果:
I/System.out: PopupMenu Size: 539 x 660
您可以将自定义布局与 PopupWindow
一起使用,然后对其进行测量
val popupWindow = PopupWindow(context)
popupWindow.contentView = View.inflate(context, R.layout.my_popup, null).apply {
measure(
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)
)
measuredWidth// <-- here is width
measuredHeight// <-- here is height
}