悬浮按钮和可交互提示的使用

（1）效果展示

（2）实现过程

1.引入material库，并sync

//material库
    implementation 'com.google.android.material:material:1.0.0'

2.准备好一张打钩的图

显示时的图片是这样的

3.修改activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout 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:id="@+id/drawerLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <!--自定义标题栏-->
        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:background="#969C99"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

            <!-- 悬浮按钮-->
        <com.google.android.material.floatingactionbutton.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="16dp"
            android:src="@drawable/yes"
            app:elevation="8dp"
           />

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

  <!--滑动自定义菜单-->
  <com.google.android.material.navigation.NavigationView
      android:id="@+id/navView"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:layout_gravity="start"
      app:menu="@menu/nav_menu"
      app:headerLayout="@layout/nav_header"/>
</androidx.drawerlayout.widget.DrawerLayout>

4.修改MainActivity.java

import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.navigation.NavigationView;
import com.google.android.material.snackbar.Snackbar;

/**
 * 悬浮按钮和交互提示
 */
public class MainActivity extends AppCompatActivity {
    private DrawerLayout mDrawerLayout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar=findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        mDrawerLayout=findViewById(R.id.drawerLayout);
        NavigationView navigationView=findViewById(R.id.navView);
        FloatingActionButton fab=findViewById(R.id.fab);//悬浮按钮
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //可交互提示
                Snackbar.make(v,"删除",Snackbar.LENGTH_SHORT)
                        .setAction("取消", new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                Toast.makeText(MainActivity.this,"已取消",Toast.LENGTH_SHORT).show();
                            }
                        }).show();
            }
        });
        ActionBar actionBar=getSupportActionBar();
        if (actionBar!=null){
            actionBar.setDisplayHomeAsUpEnabled(true);
            actionBar.setHomeAsUpIndicator(R.drawable.menu);
        }
       // navigationView.setCheckedItem(R.id.navCall);//默认选中
        navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
                switch (menuItem.getItemId()){
                    case R.id.navCall:
                        Toast.makeText(MainActivity.this,"电话",Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.navFriends:
                        Toast.makeText(MainActivity.this,"朋友",Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.navLocation:
                        Toast.makeText(MainActivity.this,"地址",Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.nav_email:
                        Toast.makeText(MainActivity.this,"邮箱",Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.navTask:
                        Toast.makeText(MainActivity.this,"任务",Toast.LENGTH_SHORT).show();
                        break;
                }
                mDrawerLayout.closeDrawers();
                return true;
            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.toolbar,menu);
        return true;
    }



    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()){
            case R.id.backup:
                Toast.makeText(this,"备份",Toast.LENGTH_SHORT).show();
                break;
            case R.id.delete:
                Toast.makeText(this,"删除",Toast.LENGTH_SHORT).show();
                break;
            case R.id.settings:
                Toast.makeText(this,"设置",Toast.LENGTH_SHORT).show();
                break;
            case R.id.back:
                Toast.makeText(this,"返回",Toast.LENGTH_SHORT).show();
                break;
            case android.R.id.home:
                mDrawerLayout.openDrawer(GravityCompat.START);
                break;
        }
        return true;
    }
}

5.源码

6.参考资料：郭霖的《第一行代码》