Android Material Design之MaterialToolbar(三)

• 上图
  

• 引入

implementation 'com.google.android.material:material:1.4.0'
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• 属性

• 使用

1. 布局源代码

<androidx.coordinatorlayout.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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <com.google.android.material.appbar.MaterialToolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/design_default_color_primary_variant"
        app:menu="@menu/menu"
        app:navigationIcon="@drawable/ic_baseline_arrow_back_24"
        app:subtitle="我是一个子标题"
        app:subtitleCentered="false"
        app:subtitleTextColor="@color/white"
        app:title="我是一个标题"
        app:titleCentered="true"
        app:logo="@mipmap/ic_launcher"
        app:titleTextColor="@color/white" />
androidx.coordinatorlayout.widget.CoordinatorLayout>
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2. menu源代码

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    
    <item
        android:id="@+id/more"
        android:icon="@drawable/ic_baseline_more_vert_24"
        android:title="更多"
        app:showAsAction="always">
        <menu>
            <item
                android:id="@+id/scan"
                android:title="扫一扫" />
        menu>
    item>
menu>
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3. activity 源代码

package com.yyf.demo;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;

import com.yyf.demo.databinding.ActivityMain3Binding;

public class MainActivity extends AppCompatActivity {
    private ActivityMain3Binding binding;
    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
        binding = ActivityMain3Binding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());
        //引入toolBar
        setSupportActionBar(binding.toolbar);
		//toolBar 左侧返回图标事件
        binding.toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d(TAG, "onClick: 点击了返回图标");
            }
        });
    }
	
	//引入menu布局文件
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu, menu);
        return true;
    }
	
	//menu选项被点击响应事件
    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.scan:
                Log.d(TAG, "onOptionsItemSelected: " + item.getTitle());
                break;
        }
        return super.onOptionsItemSelected(item);
    }
}
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• 注意事项

java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
该异常说明已经有一个标题栏存在,不能再去设置一个,解决方式如下:

1. 在activity中setContentView()前设置supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
2. 在AndroidManifest.xml中修改application标签的theme属性

<style name="Theme.BaseTheme" parent="Theme.Design.NoActionBar">
style>
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• 文中Activity使用了ViewBinding 若直接复制报错,请在项目中build.gradle android标签 下开启

	buildFeatures{
        viewBinding=true
    }
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