Question

我正在使用MainActivity来扩展Activity类。项目使用最小API为11.当我对菜单项进行膨胀时，它总是以溢出显示。

public class MainActivity extends Activity {
....
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    // Inflate the Menu Items
    getMenuInflater().inflate(R.menu.menu_main,menu);
    return true;
}

menu_main.xml

<?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 tools:context=".MainActivity">
 <item android:id="@+id/attach"
    android:title="Attachment"
    android:orderInCategory="1"
    app:showAsAction="always"/>

</menu>

Styles.xml

<!-- Base application theme. -->
<style name="AppTheme" parent="android:Theme.Holo.Light">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

Answer 1

你的MainActivity扩展了Activity而不是AppcompatActivity，你使用的是android：Theme.Holo.Light原生主题所以，你可以直接替换

应用程式：showAsAction =＆＃34;总是＆＃34;用android：showAsAction =＆＃34;总是＆＃34;

并试试，比如

<?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 tools:context=".MainActivity">
 <item android:id="@+id/attach"
    android:title="Attachment"
    android:orderInCategory="1"
    android:showAsAction="always"/>

</menu>

Answer 2

将其设置为showAsAction =＆＃34;始终＆＃34;

Answer 3

试试这段代码，

以溢出显示：

yourapp:showAsAction="always"

显示下溢

yourapp:showAsAction="never"

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:yourapp="http://schemas.android.com/apk/res-auto">
    <!-- Search, should appear as action button -->
    <item
        android:id="@+id/attach"
        android:icon="@drawable/ic_action_hardware_keyboard_arrow_left"
        android:title="Attachment"
        android:orderInCategory="1"
        yourapp:showAsAction="ifRoom" />

</menu>

检查此menu resource doc

即使使用app：showAsAction，Android菜单项也会显示在溢出区域中

3 个答案: