MainActivity

package com.example.administrator.myapplication;

import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.annotation.TargetApi;
import android.app.AlertDialog;
import android.app.Notification;
import android.app.NotificationManager;
import android.os.Build;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private Button normalToast, imageToast;
    private Button createNotify, deleteNotify;
    private int NOTIFICATION_ID = 0x123;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        normalToast = (Button) findViewById(R.id.normalToast);
        imageToast = (Button) findViewById(R.id.imageToast);
        createNotify = (Button) findViewById(R.id.createNotify);
        deleteNotify = (Button) findViewById(R.id.deleteNotify);
        // 显示普通文本Toast
        normalToast.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "普通的Toast信息", Toast.LENGTH_SHORT).show();
            }
        });
        // 显示自定义视图Toast
        imageToast.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast toast = Toast.makeText(MainActivity.this, "带图片的Toast信息", Toast.LENGTH_SHORT);
                View toastView = toast.getView();
                ImageView imageView = new ImageView(MainActivity.this);
                imageView.setImageResource(R.mipmap.ic_launcher);
                LinearLayout linearLayout = new LinearLayout(MainActivity.this);
                linearLayout.setOrientation(LinearLayout.HORIZONTAL);
                linearLayout.addView(imageView);
                linearLayout.addView(toastView);
                toast.setView(linearLayout);
                toast.show();
            }
        });
        createNotify.setOnClickListener(new View.OnClickListener() {
            @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
            @Override
            public void onClick(View v) {
                Notification.Builder builder = new Notification.Builder(MainActivity.this);
                builder.setSmallIcon(R.mipmap.ic_launcher_round);
                builder.setTicker("Notification的提示测试");
                builder.setContentTitle("Notification的标题测试");
                builder.setContentText("Notification的内容测试");
                builder.setWhen(System.currentTimeMillis());
                Notification notification = builder.build();
                notification.defaults = Notification.DEFAULT_SOUND;
                NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                notificationManager.notify(NOTIFICATION_ID, notification);
            }
        });
        deleteNotify.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                NotificationManager notificationManager=(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                NotificationManager.cancel (NOTIFICATION_ID);
            }
        });
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.administrator.myapplication.MainActivity">

    <Button
        android:id="@+id/normalToast"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="普通Toast"/>

    <Button
        android:id="@+id/imageToast"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="带图片Toast"/>
    
    <Button
        android:id="@+id/createNotify"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="创建消息"/>

    <Button
        android:id="@+id/deleteNotify"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="删除消息"/>

</LinearLayout>