如何使用SearchView与Toolbar结合

先定义一个菜单,叫什么名字无所谓，但是要在menu菜单下

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/backUp"
        android:title="Backup"
        app:actionViewClass="android.support.v7.widget.SearchView"
        app:showAsAction="always" />

</menu>

在activity布局里引用toolbar

不需要写的太复杂，简单版的就是这样

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

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

    <TextView
        android:id="@+id/tv_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="呵呵呵" />
</LinearLayout>

然后，在activity里引入toolbar，并引用写好的菜单，并在onCreateOptionsMenu里注册事件

package com.demo.sousuo;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.SearchView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TextView mTv_main;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initToolBar();
        mTv_main = findViewById(R.id.tv_main);
    }

    private void initToolBar() {
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        MenuItem item = menu.findItem(R.id.backUp);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
        //设置搜索栏的默认提示
        searchView.setQueryHint("请输入商品名称");
        //默认刚进去就打开搜索栏
        searchView.setIconified(false);
        //设置输入文本的EditText
        SearchView.SearchAutoComplete et = (SearchView.SearchAutoComplete) searchView.findViewById(R.id.search_src_text);
        //设置搜索栏的默认提示，作用和setQueryHint相同
        et.setHint("输入商品名或首字母");
        //设置提示文本的颜色
        et.setHintTextColor(Color.WHITE);
        //设置输入文本的颜色
        et.setTextColor(Color.WHITE);
        //设置提交按钮是否可见
        //searchView.setSubmitButtonEnabled(true);
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                mTv_main.setText(query);
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                return false;
            }
        });
        searchView.setOnCloseListener(new SearchView.OnCloseListener() {
            @Override
            public boolean onClose() {
                mTv_main.setText("关闭了");
                return false;
            }
        });
        return true;
    }
}