步骤:

1、依赖： compile ‘com.miguelcatalan:materialsearchview:1.4.0’

2、mxl文件中:

<FrameLayout
        android:id="@+id/toolbar_container"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@color/theme_primary" />

        <com.miguelcatalan.materialsearchview.MaterialSearchView
            android:id="@+id/search_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </FrameLayout>

3、·menu文件中:

 <item
        android:id="@+id/action_search"
        android:icon="@drawable/ic_action_action_search"
        android:orderInCategory="100"
        android:title="@string/abc_search_hint"
        app:showAsAction="always" />

4、Activity文件·

mSearchView.setOnQueryTextListener(new MaterialSearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                //提交搜索内容时的监听

                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                //文本发生改变的监听
                return false;
            }
        });
        mSearchView.setOnSearchViewListener(new MaterialSearchView.SearchViewListener() {
            @Override
            public void onSearchViewShown() {
                //搜索框展开
                Toast.makeText(MainActivity.this, "展开", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onSearchViewClosed() {
                //搜索框关闭
                Toast.makeText(MainActivity.this, "关闭", Toast.LENGTH_SHORT).show();
            }
        });
        //显示提示信息
        mSearchView.setSuggestions(getResources().getStringArray(R.array.query_suggestions));

  @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu1, menu);

        mSearchItem = menu.findItem(R.id.action_seach);
        mSearchItem.setVisible(false);
        mSearchView.setMenuItem(mSearchItem);
        return true;
    }

    /**
     * 那回退键会调用这个方法
     */
    @Override
    public void onBackPressed() {
        if (mSearchView.isSearchOpen()){
            mSearchView.closeSearch();
        }else {
            super.onBackPressed();
        }
    }