android notification怎么在状态栏显示图标

Posted 2023-04-11

根据activity的生命周期，在activity不显示时，会执行onStop函数，所以你在onStop函数（按退出键除外）里面把notification放在通知栏里，再此显示时，把notification从通知栏里去掉。
或者，只要程序在运行就一直显示通知栏图标，这样简单点。
privatevoid showNotification()
// 创建一个NotificationManager的引用
NotificationManager notificationManager = (NotificationManager)
context.getSystemService(android.content.Context.NOTIFICATION_SERVICE);
// 定义Notification的各种属性
Notification notification =new Notification(R.drawable.icon,
天籁之音播放器, System.currentTimeMillis());
notification.flags |= Notification.FLAG_ONGOING_EVENT; // 将此通知放到通知栏的Ongoing即正在运行组中
notification.flags |= Notification.FLAG_NO_CLEAR; // 表明在点击了通知栏中的清除通知后，此通知不清除，经常与FLAG_ONGOING_EVENT一起使用
notification.flags |= Notification.FLAG_SHOW_LIGHTS;
notification.defaults = Notification.DEFAULT_LIGHTS;
notification.ledARGB = Color.BLUE;
notification.ledOnMS =5000;
// 设置通知的事件消息
CharSequence contentTitle =天籁之音正在播放……; // 通知栏标题
CharSequence contentText =ameyume; // 通知栏内容
Intent notificationIntent =new Intent(context, MusicDemo.class); // 点击该通知后要跳转的Activity
PendingIntent contentItent = PendingIntent.getActivity(context, 0,
notificationIntent, 0);
notification.setLatestEventInfo(context, contentTitle, contentText,
contentItent);
// 把Notification传递给NotificationManager
notificationManager.notify(0, notification);
去掉通知栏通知的方法
// 启动后删除之前我们定义的通知
NotificationManager notificationManager = (NotificationManager) this 参考技术A setLatestEventInfoNotification.FLAG_***配合使用

Android Notification状态栏通知

没有添加额外的震动及声音效果，这里直接实现了通知的功能，看效果吧： MainActivity.java

package com.example.notification;

import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {

public NotificationManager mNotificationManager;

@SuppressLint("NewApi")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// 1-获得MotificationManager的引用。

String ns = Context.NOTIFICATION_SERVICE;
mNotificationManager = (NotificationManager) getSystemService(ns);

// 2-实例化Notification：

int icon = R.drawable.new_mail;
CharSequence tickerText = "Hello";
long when = System.currentTimeMillis();
Notification notification = new Notification(icon, tickerText,
when);

// 3-定义Notification，如显示icon、目标intent等信息

Context context = getApplicationContext();
CharSequence contentTitle = "My notification";
CharSequence contentText = "Hello World!";
Intent notificationIntent = new Intent(v.getContext(),
MessageActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(
v.getContext(), 0, notificationIntent, 0);
notification.setLatestEventInfo(context, contentTitle,
contentText, contentIntent);

// 4-传递给Manager.

final int HELLO_ID = 1;
mNotificationManager.notify(HELLO_ID, notification);
}
});

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

}

MessageActivity.java

package com.example.notification;

import android.app.Activity;
import android.app.NotificationManager;
import android.content.Context;
import android.os.Bundle;

public class MessageActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message);
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.cancel(1);//这里实现了，点击消息后，自己主动清除消息的功能。
}
}

XML布局文件就不写了。非常easy的~ 这里没有实现通知到达时的提示效果，如震动、提示音之类。将在 Android Notification实现推送消息过程中接受到消息端有声音及震动及亮屏提示 文章实现这样的功能