问题设备:
HTC One S
searchable.xml
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
android:label="@string/search_label"
android:hint="@string/search_hint"
android:voiceSearchMode="showVoiceSearchButton|launchRecognizer"
android:imeOptions="actionSearch"
android:searchSuggestAuthority="com.xxx.provider.searchsuggestion"
android:searchSuggestSelection=" ? " />
解决办法:
SearchView有一个setSubmitButtonEnabled方法,设置为true即可,搜索框不为空就会显示。效果如下图:

在onCreateOptionsMenu中inflate后调用,记得判断API Level。