notification通知应用UI之外的消息并显示即推送;
NotificationManager负责管理通知,例如显示取消,删除等;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;public class MainActivity extends AppCompatActivity implements View.OnClickListener {public Button button1,btn2;String channelId ="001" ;//这个东西是特定的@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button1 =findViewById(R.id.btn1);btn2 =findViewById(R.id.btn2);button1.setOnClickListener(this);btn2.setOnClickListener(this);}@Overridepublic void onClick(View view) {switch (view.getId()){case R.id.btn1:showCommon();break;case R.id.btn2:break;}}public void showCommon() {// Android 8.0之后,需要手动添加NotifacationChannel实现NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {NotificationChannel notificationChannel = new NotificationChannel("001", "channel_name", NotificationManager.IMPORTANCE_DEFAULT);notificationManager.createNotificationChannel(notificationChannel);}//第一步创建一个builder对线作为通知对象NotificationCompat.Builder builder=new NotificationCompat.Builder(this,channelId);//第二步设置builder的一些参数builder.setSmallIcon(R.mipmap.ic_launcher);//设置通知的小图标builder.setContentTitle("通知标题");//设置通知的标题builder.setContentText("通知内容");//设置通知的内容builder.setDefaults(Notification.DEFAULT_ALL);//设置通知的默认效果,例如震动,铃声等builder.setPriority(NotificationCompat.PRIORITY_DEFAULT);//设置通知的优先级builder.setAutoCancel(true);//设置通知被点击后自动消失builder.setWhen(System.currentTimeMillis());//设置通知产生的时间builder.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher));//设置通知的大图标//第三步显示notificationManager.notify(001,builder.build());}}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"><Buttonandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="显示一个通知"android:id="@+id/btn1"/><Buttonandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="显示"android:id="@+id/btn2"/></LinearLayout>