当用户按下工具栏中的后退图标时,我如何关闭键盘?

how i can close the keyboard when the user press the back icon in my toolbar?

我已经尝试通过我的代码显示键盘,因为 closeListener 和 onExpandListener 没有 work.Where 我失败了?有一个方法可以在用户按下工具栏的后退按钮时调用?

返回工具栏按钮的图像 --> http://imgur.com/WhzT1tp

这是我的 java 代码; 具有搜索视图的 class:

public class MainActivity extends ActionBarActivity {

SearchView searchView = null;


@Override
protected void onCreate(Bundle savedInstanceState) {
    setContentView(R.layout.activity_main);
    super.onCreate(savedInstanceState);

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

    //Title and subtitle
    toolbar.setTitle("Magazzino Chimica");

    setSupportActionBar(toolbar);

    Intent intent = getIntent();
}

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

    // Associate searchable configuration with the SearchView
    final SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    searchView = (SearchView) menu.findItem(R.id.action_search)
            .getActionView();
    searchView.setSearchableInfo(searchManager
            .getSearchableInfo(getComponentName()));

    searchView.setIconifiedByDefault(false);

    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    Toast.makeText(getApplicationContext(),"premuto",Toast.LENGTH_LONG).show();
    if (R.id.action_search == item.getItemId()){
        searchView.requestFocus();
        InputMethodManager tastiera = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        tastiera.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
    }
    return true;
}

我的searchable.xml文件:

<?xml version="1.0" encoding="utf-8"?>
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
    android:label="@string/label_ricerca"
    android:hint="@string/suggerimento_ricerca" >
</searchable>

我的清单:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="it.developer.eliax1996.databasegestionariochimica" >

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

        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />

        </intent-filter>
    </activity>

    <!-- Search results activity -->
    <activity android:name=".SearchResultsActivity"
        android:parentActivityName=".MainActivity" >
        <intent-filter>
            <action android:name="android.intent.action.SEARCH" />
        </intent-filter>

        <meta-data
            android:name="android.app.searchable"
            android:resource="@xml/searchable" />
    </activity>

    </application>

</manifest>

还有我的菜单:

<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=".MainActivity">

    <item
    android:id="@+id/action_search"
    android:title="cerca"
    android:icon="@drawable/ic_search_white"
    app:showAsAction="collapseActionView|ifRoom"
    app:actionViewClass="android.widget.SearchView" />

</menu>

如何在用户按下工具栏中的后退按钮时关闭键盘?

编辑: 我试过了,但是当应用程序是 运行 时,如果我按图像指示的按钮,程序不会通过此方法:

@Override
public boolean onOptionsItemSelected(MenuItem item) {}

编辑 x2: 我试过了,但它只在点击 2 次后才传递给该方法,我将项目文件放到网上 :),对 xml 感到抱歉,因为我是意大利人,xml 资源中的所有写入都是意大利语,但是只有 4 次写入:)

项目文件 --> https://drive.google.com/file/d/0B907WWO7eA5bZ1BTUmlIekxDaGs/view?usp=sharing

编辑 x3: 我听从了您的建议,但无法正常工作,您可以试试我的代码吗? :)

在 onCreateOptionsMenu(Menu menu) 中,添加这一行:

// This will add the back arrow to your action bar.
getSupportActionBar().setDisplayHomeAsUpEnabled(true);

在您的 onOptionsItemSelected() 中添加:

// Respond to the action bar's Up/Home button
if (item.getItemId() == android.R.id.home) {
    hideSoftKeyboard(this);
    // finish(), NavUtils.navigateUpFromSameTask(activity) or something like that
}

用隐藏键盘的方法:

public static void hideSoftKeyboard(Activity activity) {
    InputMethodManager inputMethodManager = (InputMethodManager)  activity.getSystemService(Activity.INPUT_METHOD_SERVICE);
    inputMethodManager.hideSoftInputFromWindow(activity.getCurrentFocus().getWindowToken(), 0);
}

覆盖 activity 的 onOptionsItemSelected 方法以拦截对 android.R.id.home 的点击。

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == android.R.id.home) {
        searchView.postDelayed(new Runnable() {

            @Override
            public void run() {
                InputMethodManager imm = (InputMethodManager) this.getSystemService(Context.INPUT_METHOD_SERVICE);`enter code here`
                imm.hideSoftInputFromWindow(searchView.getWindowToken(), 0);
            }

        }, 300);

        return true;
    }
    return super.onOptionsItemSelected(item);
}