Question

我正在尝试集成v7 appcompat库来实现ActionBar。我能够充气带有菜单项的操作栏但问题是我无法获得对菜单项的引用使用MenuItemCompat.getActionView（）调用。它返回null。

这是我的代码。

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);

    MenuItem copyItem = menu.findItem(R.id.action_copy);        
    TextView copyView = (TextView) MenuItemCompat.getActionView(copyItem);



    return true;
}

main.xml中 .........................

<menu xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
    android:id="@+id/action_search"
    android:orderInCategory="100"
    app:showAsAction="always"
    android:icon="@drawable/ic_action_search"
    android:title="Search"/>
<item
    android:id="@+id/action_copy"
    android:orderInCategory="100"
    app:showAsAction="always"
    android:icon="@drawable/ic_content_copy"
    android:title="Copy"/>
<item
    android:id="@+id/action_share"
    android:orderInCategory="100"
    app:showAsAction="always"
    android:icon="@drawable/ic_social_share"
    android:title="Share"/>

styles.xml

.................

 <resources>

<!--
    Base application theme, dependent on API level. This theme is replaced
    by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
-->
<style name="AppBaseTheme" parent="@style/Theme.AppCompat">
    <!--
        Theme customizations available in newer API levels can go in
        res/values-vXX/styles.xml, while customizations related to
        backward-compatibility can go here.
    -->
</style>

<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
    <!-- All customizations that are NOT specific to a particular API-level can go here. -->
</style>

 manifest.xml

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.hmkcode.android.MainActivity"
        android:label="@string/app_name"
        android:theme="@style/Theme.AppCompat.Light" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

请告诉我遗失的地方。

由于

Answer 1

请告诉我遗失的地方。

您没有在菜单XML资源中定义的操作视图。因此，getActionView()应该返回null。

如果您希望getActionView()返回非null值，则需要关注the documentation并向菜单XML资源添加操作视图，例如：

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:yourapp="http://schemas.android.com/apk/res-auto" >
    <item android:id="@+id/action_search"
          android:title="@string/action_search"
          android:icon="@drawable/ic_action_search"
          yourapp:showAsAction="ifRoom|collapseActionView"
          yourapp:actionViewClass="android.support.v7.widget.SearchView" />
</menu>

Android MenuItemCompat.getActionView（MenuItem）返回null

1 个答案: