Honeycomb 3.2上的android searchview setOnActionExpandListener

Question

我正在为Android 3.2及更高版本开发应用程序android-support-v4.OnActionExpandListener当扩展操作栏中的SearchView以及何时折叠时,我需要实现"拦截".我的Android 4.0及更高版本的代码没问题,但对于3.2没有.

menu.xml文件

<item android:id="@+id/menu_search"
    android:title="@string/menu_search"
    android:icon="@android:drawable/ic_menu_search"
    android:showAsAction="collapseActionView|always"
    android:actionViewClass="android.widget.SearchView" />

MyActivity.java

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

    final MenuItem searchMI = menu.findItem(R.id.menu_search);
    if(searchView == null) {
        //searchView = (SearchView) searchMI.getActionView();
        searchView = (SearchView) MenuItemCompat.getActionView(searchMI);
        searchView.setOnQueryTextListener(this);
        searchView.setOnSuggestionListener(this);
        searchView.setOnCloseListener(new OnCloseListener() {

            @Override
            public boolean onClose() {
                //some code
                return false;
            }
        });
    }


    int currentapiVersion = android.os.Build.VERSION.SDK_INT;
    if (currentapiVersion <= android.os.Build.VERSION_CODES.HONEYCOMB_MR2) {
        MenuItemCompat.setShowAsAction(searchMI, MenuItemCompat.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW | MenuItemCompat.SHOW_AS_ACTION_ALWAYS);
        MenuItemCompat.setOnActionExpandListener(searchMI, new OnActionExpandListener() {

            /* (non-Javadoc)
             * @see android.support.v4.view.MenuItemCompat.OnActionExpandListener#onMenuItemActionExpand(android.view.MenuItem)
             */
            @Override
            public boolean onMenuItemActionExpand(MenuItem item) {
                Toast.makeText(getApplicationContext(), "onMenuItemActionExpand", Toast.LENGTH_SHORT).show();
                return true;
            }

            /* (non-Javadoc)
             * @see android.support.v4.view.MenuItemCompat.OnActionExpandListener#onMenuItemActionCollapse(android.view.MenuItem)
             */
            @Override
            public boolean onMenuItemActionCollapse(MenuItem item) {
                Toast.makeText(getApplicationContext(), "onMenuItemActionExpand", Toast.LENGTH_SHORT).show();
                return true;
            }
        });
    } else {
        searchMI.setOnActionExpandListener(new MenuItem.OnActionExpandListener() {

            @Override
            public boolean onMenuItemActionExpand(MenuItem item) {
                Toast.makeText(getApplicationContext(), "MenuItem#onMenuItemActionExpand", Toast.LENGTH_SHORT).show();
                return true;
            }

            @Override
            public boolean onMenuItemActionCollapse(MenuItem item) {
                Toast.makeText(getApplicationContext(), "MenuItem#onMenuItemActionExpand", Toast.LENGTH_SHORT).show();
                return true;
            }
        });
    }
}

为什么,对于Honeycomb,没有调用监听器的方法？

非常感谢.

Answer 1

你可能错过了(就像我做的那样)`MenuItemCompat.OnActionExpandListener'接口有静态实现,而不是实例方法.

所以,如果你有一个MenuItemCompat.OnActionExpandListener在那个类中实现的类,你需要将它作为监听器安装,如下所示:

    MenuItem menuItem =  menu.findItem(R.id.search);
    if (menuItem != null) {
        MenuItemCompat.setOnActionExpandListener(menuItem,this);
        MenuItemCompat.setActionView(menuItem, mSearchView);
    }

相同的范例适用于setActionView ...而不是调用menuItem.setActionView(this),您将menuItem作为第一个参数传递给静态版本,MenuItemCompat.setActionView然后使用其他参数.

Answer 2

要使MenuItemCompat.setOnActionExpandListener起作用,您应该在菜单项中添加" collapseActionView " - 例如 -

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

在onCreateOptionsMenu中你可以这样使用它 -

MenuItemCompat.setOnActionExpandListener(menu_search,
            new OnActionExpandListener()
            {
                @Override
                public boolean onMenuItemActionCollapse(MenuItem item)
                {
                    // Do something when collapsed
                    return true; // Return true to collapse action view
                }

                @Override
                public boolean onMenuItemActionExpand(MenuItem item)
                {
                    // Do something when expanded
                    return true; // Return true to expand action view
                }
            });

Answer 3

MenuItemCompat.setOnActionExpandListener(...)如果你不通过,我发现这是行不通的:

    searchItem
            .setShowAsAction(MenuItemCompat.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW
                    | MenuItemCompat.SHOW_AS_ACTION_ALWAYS);

但这正在改变SearchView,并用后箭头替换DrawerToggle.

我想保留原始视图并仍然跟踪Expanded/Collapsed状态并使用支持的搜索视图.

解:

当android.support.v7.widget.SearchView更改视图状态时,LinearLayout视图的id android.support.v7.appcompat.R.id.search_edit_frame,可见性值将从更改View.VISIBLE为View.GONE相反.所以我添加了ViewTreeObserver来跟踪搜索编辑框架的可见性变化.

menu_search.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:icon="@android:drawable/ic_menu_search"
    android:title="@string/search"
    app:actionViewClass="android.support.v7.widget.SearchView"
    app:showAsAction="always"/>

</menu>

在活动中:

import android.support.v4.view.MenuItemCompat;
import android.support.v7.widget.SearchView;
import android.view.Menu;
import android.view.MenuItem;

..........

private View mSearchEditFrame;

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_search, menu);
    MenuItem searchItem = (MenuItem) menu.findItem(R.id.action_search);

    SearchView searchView = (SearchView) MenuItemCompat
            .getActionView(searchItem);
    searchView.setSubmitButtonEnabled(false);
    mSearchEditFrame = searchView
            .findViewById(android.support.v7.appcompat.R.id.search_edit_frame);

    ViewTreeObserver vto = mSearchEditFrame.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        int oldVisibility = -1;

        @Override
        public void onGlobalLayout() {

            int currentVisibility = mSearchEditFrame.getVisibility();

            if (currentVisibility != oldVisibility) {
                if (currentVisibility == View.VISIBLE) {
                    Log.v(TAG, "EXPANDED");
                } else {
                    Log.v(TAG, "COLLAPSED");
                }

                oldVisibility = currentVisibility;
            }

        }
    });

    return super.onCreateOptionsMenu(menu);
}

谢谢!