actionbar中添加searchview并监听期伸缩/打开的方法

首先在xml中设置actionviewclass

 <item android:id="@+id/m1"
        android:title="setting"
        android:icon="@drawable/abc_ic_search_api_mtrl_alpha"
        android:showAsAction="always|collapseActionView"
        android:actionViewClass="android.widget.SearchView" />

然后在oncreateoptionmenu方法中获得menu实例，并设置监听

public boolean onCreateOptionsMenu(Menu menu) {
        
        getMenuInflater().inflate(R.menu.optionmenu, menu);
        MenuItem search = menu.findItem(R.id.m1);
        SearchView searchView = (SearchView) search.getActionView();
                MenuItemCompat.setOnActionExpandListener(search, new MenuItemCompat.OnActionExpandListener() {
            @Override
            public boolean onMenuItemActionCollapse(MenuItem item) {
                // Do something when collapsed
                Toast.makeText(MainActivity.this, "hello expand", Toast.LENGTH_LONG).show();
                return true;  // Return true to collapse action view
            }

            @Override
            public boolean onMenuItemActionExpand(MenuItem item) {
                // Do something when expanded
                Toast.makeText(MainActivity.this, "hello expand", Toast.LENGTH_LONG).show();
                return true;  // Return true to expand action view
            }
        });
        return true;
    }

注意添加监听的方式