Android Toolbar的使用 顶部标题栏+后退键

 最近设计安卓里面有个标题栏，里面有个后退键，可以完成后退之类的功能。

好，刚好可以用Toolbar去实现

上代码：activity_main.xml

xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:layout_gravity="center"
                android:text="设置"
                android:textSize="22sp" />
        android.support.v7.widget.Toolbar>
    android.support.design.widget.AppBarLayout>

android.support.design.widget.CoordinatorLayout>

这里需要引用styles.xml在里面加样式

<resources>

    
    <style name="AppTheme" parent="Base.Theme.AppCompat.Light">
        
        <item name="colorPrimary">@color/colorPrimaryitem>
        <item name="colorPrimaryDark">@color/colorPrimaryDarkitem>
        <item name="colorAccent">@color/colorAccentitem>
    style>

    <style name="AppTheme.NoActionBar">
        <item name="windowActionBar">falseitem>
        <item name="windowNoTitle">trueitem>
    style>

    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />

    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />

resources>
    

最后主程序：

package action.sun.com.testtoobar1;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /*getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);    //设置全屏*/
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

        //一定要加，为了去掉本身的标题文字
        toolbar.setTitle("");
        //初始化toolbar
        setSupportActionBar(toolbar);
        //左边的小箭头（注意需要在setSupportActionBar(toolbar)之后才有效果）
        toolbar.setNavigationIcon(R.mipmap.back);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        Toast.makeText(MainActivity.this, "选择了菜单", Toast.LENGTH_SHORT).show();
        //初始化右边的菜单选项
        //getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        Toast.makeText(MainActivity.this, "选择了后退按钮="+id, Toast.LENGTH_SHORT).show();
        //noinspection SimplifiableIfStatement
        return super.onOptionsItemSelected(item);
    }


}

到此代码完毕，就能够完成需要上图实现的效果了