MenuItemCompat.getActionView始终返回null

Question

我刚刚实现了v7 AppCompat支持库,但在MenuItemCompat.getActionView我测试的每个Android版本中总是返回null(4.2.2,2.3.4 ....)

该SearchView显示在操作栏上,但它不响应触摸操作,不会展开,以显示其EditText与就像一个简单的图标.

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu, menu);

    MenuItem searchItem = menu.findItem(R.id.action_search);
    SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
    if (searchView != null) {
        SearchViewCompat.setOnQueryTextListener(searchView, mOnQueryTextListener);
        searchView.setIconifiedByDefault(false);
        Log.d(TAG,"SearchView not null");
    } else
        Log.d(TAG, "SearchView is null");
    }
    return super.onCreateOptionsMenu(menu);
}

menu.xml文件

<?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">

    <item android:id="@+id/action_search"
          app:showAsAction="always|collapseActionView"
          android:icon="@drawable/abc_ic_search"
          android:title="@string/action_bar_search"
          android:actionViewClass="android.support.v7.widget.SearchView"/>

    <item android:id="@+id/action_refresh"
          android:icon="@drawable/refresh"
          android:title="@string/action_bar_refresh"
          app:showAsAction="ifRoom"/>
</menu>

Answer 1

最后我找到了解决方案.

1. 将名称空间actionViewClass从更改android:actionViewClass为app:actionViewClass

2. 实现 android.support.v7.widget.SearchView.OnQueryTextListener当前活动的界面.

3. 直接使用setOnQueryTextListener而不是SearchViewCompat.setOnQueryTextListener

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
     MenuInflater inflater = getMenuInflater();
     inflater.inflate(R.menu.menu, menu);
   
     MenuItem searchItem = menu.findItem(R.id.action_search);
     SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
     if (searchView != null) {
        searchView.setOnQueryTextListener(this);
     }
   
     return super.onCreateOptionsMenu(menu);
   }
   

Answer 2

就我而言,它是ProGuard文件.你需要添加这一行:

-keep class android.support.v7.widget.SearchView { *; }

Answer 3

对我来说,错误的menu.xml命名空间导入导致了这个问题.

我原来的menu.xml:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/tools">
        <item android:id="@+id/action_search"
              android:title="@string/map_option_search"
              android:icon="@drawable/ic_action_search"
              app:showAsAction="collapseActionView|ifRoom"
              app:actionViewClass="android.support.v7.widget.SearchView"/>
</menu>

它看起来像是xmlns:app="http://schemas.android.com/tools"导致MenuItemCompat.getActionView()返回null.更改此导入以xmlns:app="http://schemas.android.com/apk/res-auto"修复问题.

新工作menu.xml:

<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:title="@string/map_option_search"
              android:icon="@drawable/ic_action_search"
              app:showAsAction="collapseActionView|ifRoom"
              app:actionViewClass="android.support.v7.widget.SearchView"/>
</menu>

Answer 4

我认为问题是您使用Support V7包中的SearchView,并且您的API级别可能设置为..... 22 ??.

将代码更改为以下内容以解决问题:

menu.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <item 
        android:id="@+id/action_search"
        android:icon="@drawable/actionbar_button_search"
        android:title="Search"
        android:showAsAction="always"
        android:actionViewClass="android.widget.SearchView" />
</menu>