如何自定义弹出菜单以更改每个弹出菜单中每个选项的颜色/字体/样式?
3 回答
我在自定义 PopupMenu 字体和文本大小时遇到了同样的问题。最后我使用了反射。它可用于任何弹出菜单项的自定义。android支持中菜单项的资源布局在android.support.v7.internal.view.menu.MenuPopupHelper中定义,其字段名称为“ITEM_LAYOUT”,声明为static final;它的值等于“R.layout.abc_popup_menu_item_layout” 我在 Grepcode 中找到布局文件并将其复制到我的项目布局目录中。我将其命名为 popup_menu_item_layout.xml。我的弹出菜单项布局在这里
<?xml version="1.0" encoding="utf-8"?>
<mypackage.PopupMenuItemView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?attr/dropdownListPreferredItemHeight"
android:minWidth="196dip"
android:paddingRight="16dip">
<!-- Icon will be inserted here. -->
<!-- The title and summary have some gap between them, and this 'group' should be centered vertically. -->
<RelativeLayout
android:layout_width="0dip"
android:layout_weight="1"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="16dip"
android:duplicateParentState="true">
<TextView
android:id="@+id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:textAppearance="?attr/textAppearanceLargePopupMenu"
android:singleLine="true"
android:duplicateParentState="true"
android:ellipsize="marquee"
android:fadingEdge="horizontal"/>
<TextView
android:id="@+id/shortcut"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/title"
android:layout_alignParentLeft="true"
android:textAppearance="?attr/textAppearanceSmallPopupMenu"
android:singleLine="true"
android:duplicateParentState="true"/>
</RelativeLayout>
<!-- Checkbox, and/or radio button will be inserted here. -->
然后创建自定义类 PopupMenuItemView:
public class PopupMenuItemView extends android.support.v7.internal.view.menu.ListMenuItemView {
public PopupMenuItemView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PopupMenuItemView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
applyTypefaceToAll(this, your_typeface);
TypefaceUtils.applyTextSizeToAll(this, your_textsize);
}
public static void applyTypefaceToAll(View view, Typeface typeface) {
if (view instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) view;
for (int childIndex = 0; childIndex < viewGroup.getChildCount(); childIndex++)
applyTypefaceToAll(viewGroup.getChildAt(childIndex), typeface);
} else if (view instanceof TextView) {
TextView textView = (TextView) view;
textView.setTypeface(typeface);
textView.setPaintFlags(textView.getPaintFlags() | Paint.SUBPIXEL_TEXT_FLAG | Paint.DEV_KERN_TEXT_FLAG | Paint.ANTI_ALIAS_FLAG);
}
}
public static void applyTextSizeToAll(View view, float size) {
if (view instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) view;
for (int childIndex = 0; childIndex < viewGroup.getChildCount(); childIndex++)
applyTextSizeToAll(viewGroup.getChildAt(childIndex), size);
} else if (view instanceof TextView) {
TextView textView = (TextView) view;
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
textView.setPaintFlags(textView.getPaintFlags() | Paint.SUBPIXEL_TEXT_FLAG | Paint.DEV_KERN_TEXT_FLAG | Paint.ANTI_ALIAS_FLAG);
}
}
}
最后通过反射替换菜单项的布局资源id;在您的主要活动 onCreate 方法或您的应用程序 onCreate 方法中的一些地方:
try {
setFinalStatic(MenuPopupHelper.class.getDeclaredField("ITEM_LAYOUT"),
R.layout.popup_menu_item_layout);
} catch (Exception e) {
e.printStackTrace();
}
public static void setFinalStatic(Field field, Object newValue) throws Exception {
field.setAccessible(true);
try {
Field modifiersField = Field.class.getDeclaredField("modifiers");
modifiersField.setAccessible(true);
modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
}catch (Exception e) {
e.printStackTrace();
}
field.set(null, newValue);
}
您可以将弹出窗口视为视图,甚至可以视为单独的活动(使用透明背景,查看 android 上的主题选项)
然后,当您想要显示弹出窗口时,您可以从应用程序中的任何活动启动它,它始终具有相同的 bg 和按钮样式,您只会为其提供实际数据。
例如:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="300dp"
android:background="@drawable/bg_popup"
android:layout_gravity="center"
android:alpha="0.8"
android:visibility="visible"
android:id="@+id/generic_popup2_container"
android:layout_height="300dp">
<TextView
android:id="@+id/generic_popup2_tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/white"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:layout_alignParentTop="true"
android:text="header"
android:gravity="center"
android:textSize="28sp" />
<TextView
android:id="@+id/generic_popup2_tv_inner_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/white"
android:text="content"
android:textSize="16sp"
android:gravity="center"
android:layout_marginTop="20dp"
android:layout_below="@id/generic_popup2_tv_title"
android:layout_centerHorizontal="true" />
<LinearLayout
android:id="@+id/generic_popup_2_buttons_layout"
android:layout_centerHorizontal="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="20dp"
android:orientation="horizontal">
<Button
android:id="@+id/layout_2_generic_popup_btn_action1"
android:layout_width="115dp"
android:layout_height="35dp"
android:textColor="@color/white"
android:layout_marginBottom="10dp"
android:textSize="12sp"
android:layout_marginRight="10dp"
android:background="@drawable/popup_btn_blue" />
<Button
android:id="@+id/layout_2_generic_popup_btn_action2"
android:layout_width="115dp"
android:layout_height="35dp"
android:textColor="@color/white"
android:textSize="12sp"
android:background="@drawable/popup_btn_blue" />
</LinearLayout>
创建一个弹出窗口并根据需要对其进行自定义。
以下是一些有用的链接:
how-to-create-popup-window-in-android
您还可以查看快速操作对话框。