为什么 SearchView 在 toolbar/actionbar 上出现两次？

Question

在接下来的SSCCE中，SearchView在Toolbar/ActionBar上出现了两次。 问题是为什么！

SSCCE

MainActivity.java

public class MainActivity extends AppCompatActivity {
    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        textView = (TextView) findViewById(R.id.mainActivity_textView);



        handleIntent(getIntent());
    }

    @Override
    protected void onNewIntent(Intent intent) {
        setIntent(intent);
        handleIntent(intent);
    }

    private void handleIntent(Intent intent) {
        if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
          String query = intent.getStringExtra(SearchManager.QUERY);
          doMySearch(query);
        }
    }

    private void doMySearch(String searchQuery) {
        textView.setText(searchQuery); 
    }

    @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);

        // Inflate the options menu from XML
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu);

        // Get the SearchView and set the searchable configuration
        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        MenuItem searchMenuItem = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchMenuItem);
        // Assumes current activity is the searchable activity
        searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
        //searchView.setIconifiedByDefault(false); // Do not iconify the widget; expand it by default

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        return super.onOptionsItemSelected(item);
    }
}

activity_main.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="practice_projects.materialdesigngooglenowlikesearchviewgive.MainActivity" >

    <include android:id="@+id/mainActivity_toolbar"
        layout="@layout/app_bar"/>

    <TextView
        android:id="@+id/mainActivity_textView"
        android:layout_below="@id/mainActivity_toolbar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

app_bar.xml

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </android.support.v7.widget.Toolbar>

res/menu/main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="practice_projects.materialdesigngooglenowlikesearchviewgive.MainActivity" >

    <item 
        android:id="@+id/action_search"
        android:orderInCategory="100"
        android:title="@string/searchMenuIcon_title"
        android:icon="@drawable/ic_search_black_24dp"
        app:showAsAction="always"
        app:actionViewClass="android.support.v7.widget.SearchView"
        app:iconifiedByDefault="false" /> 

</menu>

res/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" >
</searchable>

res/values/styles.xml

<resources>
    <style name="AppBaseTheme" parent="Theme.AppCompat.Light">
        <item name="colorPrimary">@color/primary</item>
        <item name="colorPrimaryDark">@color/primaryDark</item>
        <item name="colorAccent">@color/accent</item>
    </style>

    <style name="AppTheme" parent="AppBaseTheme"></style>

</resources>

res/values*-v21*/styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="AppTheme" parent="AppBaseTheme"></style>
</resources>

Answer 1

因为您在 onCreateOptionsMenu() 中将菜单资源膨胀了两次。移除你的两个 inflate() 调用之一。

Answer 2

两次？删除第一行

 getMenuInflater().inflate(R.menu.main, menu); //remove this line

 // Inflate the options menu from XML
 MenuInflater inflater = getMenuInflater();
 inflater.inflate(R.menu.main, menu);

为什么 SearchView 在 toolbar/actionbar 上出现两次？

Why does the SearchView appear twice on the toolbar/actionbar?

android

android-appcompat

searchview

material-design

appcompat-v7-toolbar