我在尝试将 SearchView 小部件添加到我的活动中的 ActionBar 时遇到问题 - 在调用 getActionView 以获取我的 SearchView 对象时，我得到一个空值。
我一直在关注 Android 开发人员指南，还经历了很多 SO 问题以及互联网上的其他一些链接；一切都无济于事。这可能很简单，但我无法弄清楚 - 在我看来，我的代码与谷歌的代码基本相同（除了更改一些名称等），但它仍然无法工作。
任何帮助，将不胜感激。
下面包括代码的相关位。如果您对可能出现的问题有任何想法，请告诉我。
活动代码：
private ListView workflowListView;
private DrawerLayout drawerLayout;
private ListView drawerList;
private ActionBarDrawerToggle drawerToggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
setContentView(R.layout.activity_workflow_list);
workflowListView = (ListView) findViewById(R.id.workflowListView);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerList = (ListView) findViewById(R.id.drawer_list);
drawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
drawerLayout, /* DrawerLayout object */
R.drawable.ic_launcher, /* nav drawer icon to replace 'Up' caret */
R.string.app_name, /* "open drawer" description */
R.string.app_name /* "close drawer" description */
) {
/** Called when a drawer has settled in a completely closed state. */
public void onDrawerClosed(View view) {
// getActionBar().setTitle("Closed drawer");
}
/** Called when a drawer has settled in a completely open state. */
public void onDrawerOpened(View drawerView) {
// getActionBar().setTitle("Open drawer");
}
};
drawerLayout.setDrawerListener(drawerToggle);
ActionBar actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
actionBar.setIcon(android.R.color.transparent);
String[] testData = {"a", "b", "c", "d"};
ArrayList<String> workflowList = new ArrayList<String>();
for (String s : testData) {
workflowList.add(s);
}
ArrayAdapter<String> workflowAdapter = new ArrayAdapter<String>(this.getApplicationContext(), R.layout.workflow_list_item, workflowList);
workflowListView.setAdapter(workflowAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.workflow_list, menu);
inflater.inflate(R.menu.options_menu, menu);
// Associate searchable configuration with the SearchView
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
// The below line returned null even though it was used in Google sample code
SearchView searchView = (SearchView) menu.findItem(R.id.search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
return super.onCreateOptionsMenu(menu);
}
xml/searchable.xml：
<?xml version="1.0" encoding="utf-8"?>
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
android:label="@string/app_name"
android:hint="@string/search_hint"
android:includeInGlobalSearch="false" />
菜单/options_menu.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" >
<item android:id="@+id/search"
android:title="@string/search_title"
android:icon="@drawable/ic_action_search"
android:showAsAction="always|collapseActionView"
android:actionViewClass="android.support.v7.widget.SearchView" />
</menu>