Android:如何让SearchView 占据ActionBar 的整个水平空间？

Question

在下面的屏幕截图中，ActionBar 中的 SearchView 小部件没有占用整个可用空间。

我需要它占据 ActionBar 中存在的所有水平空间(因此它水平跨越整个屏幕)。

我尝试了什么:

• 以编程方式，在 onCreateOptionsMenu 中尝试这样做:

  View searchViewView = (View) searchView;
  searchViewView.getLayoutParams().width=LayoutParams.MATCH_PARENT;`
  

  这给出:

  java.lang.NullPointerException: Attempt to write to
  field 'int android.view.ViewGroup$LayoutParams.width' on a null
  object reference ...       
  TestActionBarTwo.MainActivity.onCreateOptionsMenu(MainActivity.java:57)
  

• 在菜单资源中:

  android:layout_width="match_parent" 似乎没有影响 任何东西。

• 我还尝试了 android:layout_weight="1"(假设 ActionBar 有一个 LinearLayout)，但这也不起作用。

那么有没有办法让 SearchView(未图标化)占据 ActionBar 的整个水平空间？

---

编辑 1

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        Log.i(TAG, "onCreateOptionsMenu OF MainActivity CALLED."); //check

        getMenuInflater().inflate(R.menu.activity_main_action_bar_menu, menu);

        getSupportActionBar().setDisplayShowHomeEnabled(false);
        getSupportActionBar().setDisplayShowTitleEnabled(false);

        // SearchAction
        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        MenuItem searchMenuItem = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchMenuItem); 
        searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
        searchView.setIconifiedByDefault(false);

        //Adding event listeners
        searchView.setOnQueryTextFocusChangeListener(new OnFocusChangeListener() { 
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                Log.i(TAG, "onFocusChange OF ONFocusChangeListener IN MainActivity CALLED."); //check
            }
        });

        return super.onCreateOptionsMenu(menu);
    }

菜单资源是:

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

---

编辑 2:即使我没有设置 setIconifiedByDefault(false)，即使它看起来不相关:`

代码更改:

// SearchAction
        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        MenuItem searchMenuItem = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchMenuItem); 
        searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
        //searchView.setIconifiedByDefault(false);************************

        getSupportActionBar().setDisplayShowHomeEnabled(false);
        getSupportActionBar().setDisplayShowTitleEnabled(false);

结果，当我单击图标化搜索图标将其展开时:

---

编辑 3:从@MaheeraJazi 的答案中复制代码，但似乎仍然无效。我现在发布整个 SSCCE:

MainActivity.java:-

public class MainActivity extends ActionBarActivity {
    private static final String TAG = MainActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.i(TAG, "onCreate OF MainActivity CALLED."); // check
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getSupportActionBar().setDisplayShowHomeEnabled(false); 
        getSupportActionBar().setDisplayShowTitleEnabled(false);

        handleIntent(getIntent());
    }

    @Override
    protected void onNewIntent(Intent intent) {
        Log.i(TAG, "onNewIntent OF MainActivity CALLED."); // check
        handleIntent(intent);
        setIntent(intent);
    }

    private void handleIntent(Intent intent) {
        Log.i(TAG, "handleIntent OF MainActivity CALLED."); // check
        if (intent.getAction().equals(Intent.ACTION_SEARCH)) {
            showResults(intent.getStringExtra(SearchManager.QUERY));
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        Log.i(TAG, "onCreateOptionsMenu OF MainActivity CALLED."); // check

        // Inflate the menu items for use in the action bar
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.activity_main_action_bar_menu, menu);

        // SearchAction
        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        MenuItem searchMenuItem = menu.findItem(R.id.mainActivity_actionSearch);
        SearchView searchViewActionView = (SearchView) MenuItemCompat.getActionView(searchMenuItem);
        searchViewActionView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
        searchViewActionView.setIconifiedByDefault(true);

        SearchView.OnQueryTextListener queryTextListener = new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextChange(String newText) {
                Log.i(TAG, "onQueryTextChange OF  OnQueryTextListener IN MainActivity CALLED.");//check
                // this is your adapter that will be filtered
                return true;

            }
            @Override
            public boolean onQueryTextSubmit(String query) {
                Log.i(TAG, "onQueryTextChange OF  OnQueryTextListener IN MainActivity CALLED.");//check
                return true;
            }
        };
        searchViewActionView.setOnQueryTextListener(queryTextListener);

        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem menuItem) {
        Log.i(TAG, "onOptionsItemSelected OF MainActivity CALLED."); // check
        switch (menuItem.getItemId()) {
        case R.id.mainActivity_actionSearch:
            onSearchRequested();
            return true;
        default:
            return super.onOptionsItemSelected(menuItem);
        }
    }

    private void showResults(String searchQuery) {
        Log.i(TAG, "showResults OF MainActivity CALLED."); // check
    }
}

activity_main_action_bar_menu.xml:-

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

activity_main.xml:-

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

</LinearLayout>

list 文件:-

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="khanZarah.tests.TestActionBarTwo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/Theme.AppCompat.Light"
            android:launchMode="singleTop"
            android:uiOptions="splitActionBarWhenNarrow" >
            <meta-data android:name="android.support.UI_OPTIONS"
                android:value="splitActionBarWhenNarrow" />
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.SEARCH" />
            </intent-filter>
            <meta-data android:name="android.app.searchable"
                android:resource="@xml/searchable" />
        </activity>

        <meta-data android:name="android.app.default_searchable"
            android:value=".MainActivity"/>
    </application>

Answer 1

工具栏中搜索 View 的默认宽度由非公共(public)属性 abc_search_view_preferred_width 定义。对于所有屏幕尺寸，它都设置为 320dp。

解决方法是设置 SearchView 的 maxWidth:

searchView.setMaxWidth(Integer.MAX_VALUE);