DrawerLayout，ToolBar 和 TabHost 的使用

<?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/menu_search"
        android:title="搜索"
        android:icon="@drawable/actionbar_search_icon"
        app:showAsAction="always" />   // 总是显示在toolbar上
        
    <item
        android:id="@+id/menu_search1"
        android:icon="@drawable/actionbar_search_icon"
        android:title="搜索1"
        app:showAsAction="ifRoom" />  //toolbar有地方就显示

    <item
        android:id="@+id/menu_search2"
        android:icon="@drawable/actionbar_search_icon"
        android:title="搜索2"
        app:showAsAction="never" /> //是否作为菜单项，隐藏在右上角                      的三个点里面

</menu>

package cn.zhw.demo;

import android.nfc.tech.NfcB;
import android.support.v4.app.FragmentTabHost;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TabHost;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
//        setTitle("你好啊");
        getSupportActionBar().setTitle("heihehie");
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        DrawerLayout drawerLayout = (DrawerLayout) findViewById(R.id.drawerlayout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this,drawerLayout,toolbar,R.string.app_name,R.string.app_name);
        drawerLayout.addDrawerListener(toggle);// 面板展开的监听设置给 Toogle
        toggle.syncState();// 初始化 toogle 的绘制内容

        // 设置底部栏
        FragmentTabHost tabHost = (FragmentTabHost) findViewById(R.id.tabhost);
        tabHost.setup(this,getSupportFragmentManager(),R.id.container);// 初始化 tabhost

        // 添加一个 tab
        TabHost.TabSpec tab1 = tabHost.newTabSpec("news");// 创建tab对象
        tab1.setIndicator("资讯");// 设置tab 内容

        Bundle arg = new Bundle();
        arg.putString("content","资讯界面");

        tabHost.addTab(tab1,TestFragment.class,arg);// 将tab添加到底部栏

        // 再添加一个 Tab
        TabHost.TabSpec tab2 = tabHost.newTabSpec("tweet");
        tab2.setIndicator("动弹");
        Bundle arg2 = new Bundle();
        arg2.putString("content","动弹界面");
        tabHost.addTab(tab2,TestFragment.class,arg2);
    }

    @Override
    // 为 Activity 生成菜单，ToolBar已经被设置为标题栏，这个菜单会自动显示到 ToolBar 上
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main,menu);

        return super.onCreateOptionsMenu(menu);
    }

    @Override
    // 目录菜单的点击响应
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()){
            case R.id.menu_search:
                Toast.makeText(this, "跳转到搜索界面", Toast.LENGTH_SHORT).show();
                break;
        }

        return super.onOptionsItemSelected(item);
    }
}