【Android】状态栏通知Notification

状态栏通知必须用到两个类：NotificationManager、Notification。

NotificationManager是一个系统服务，可以通过以下方式获得：

notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

Notification是一个具体的通知对象，必须设置两个参数才会有效：

1.icon，通知栏图标

2.pendingIntent，点击通知后执行的动作。

一条最简单的通知如下：

Notification notification = new Notification();
notification.icon = R.drawable.dog;// 通知栏图标
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
new Intent(this, NotificationActivity.class),
PendingIntent.FLAG_UPDATE_CURRENT);
notification
.setLatestEventInfo(this, "今日头条", "阿里巴巴上市了！", pendingIntent);
notificationManager.notify(0, notification);

效果图：



下面给出一个比较全的例子。

NotificationActivity.java：

package com.zzj.ui.notificationdemo;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

import com.zzj.ui.R;

public class NotificationActivity extends Activity {
private NotificationManager notificationManager;// 通知管理器
private int notificationId = -1;// 通知标识ID
private int requestCode = 99;// 跳转请求编号
private final String title = "今日头条_";
private final String content = "阿里巴巴上市了_";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.notification_activity);

notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

}

@SuppressWarnings("deprecation")
public void send(View view) {
notificationId++;
requestCode++;
String tempTitle = title + notificationId;
String tempContent = content + notificationId;

Notification notification = new Notification();
notification.icon = R.drawable.dog;// 通知栏图标
notification.tickerText = tempContent;// 状态栏滚动提示
notification.defaults = Notification.DEFAULT_SOUND;// 声音提示

Intent intent = new Intent(this, ShowNotificationActivity.class);
intent.putExtra("notificationId", notificationId);
intent.putExtra("title", tempTitle);
intent.putExtra("content", tempContent);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

PendingIntent pendingIntent = PendingIntent.getActivity(this,
requestCode, intent, PendingIntent.FLAG_UPDATE_CURRENT);
notification.setLatestEventInfo(this, tempTitle, tempContent,
pendingIntent);

notificationManager.notify(notificationId, notification);
}
}

notification_activity.xml：

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

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="send"
android:text="发送通知" />

</LinearLayout>

显示消息的activity类ShowNotificationActivity.java：

package com.zzj.ui.notificationdemo;

import android.app.Activity;
import android.app.NotificationManager;
import android.os.Bundle;
import android.widget.TextView;

import com.zzj.ui.R;

public class ShowNotificationActivity extends Activity {
private TextView textView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.shownotification_activity);

setTitle(getIntent().getStringExtra("title"));

textView = (TextView) findViewById(R.id.textView1);
textView.setText(getIntent().getStringExtra("content"));

// 取消通知
int notificationId = getIntent().getIntExtra("notificationId", 0);
((NotificationManager) getSystemService(NOTIFICATION_SERVICE))
.cancel(notificationId);
}
}

shownotification_activity.xml：

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

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

</LinearLayout>

效果图：



状态栏通知：



显示通知内容：



温馨提示：

1.如果每此发送通知的notificationId相同，则通知栏只会显示最后一条通知；

2.如果每此发送通知的requestCode相同，则不管点击哪一条通知，都只会显示最后一条通知的内容。

android高版本提供了Notification.Builder来创建Notification对象：

// @SuppressWarnings("deprecation")
public void send(View view) {
notificationId++;
requestCode++;
String tempTitle = title + notificationId;
String tempContent = content + notificationId;

// Notification notification = new Notification();
// notification.icon = R.drawable.dog;// 通知栏图标
// notification.tickerText = tempContent;// 状态栏滚动提示
// notification.defaults = Notification.DEFAULT_SOUND;// 声音提示

Intent intent = new Intent(this, ShowNotificationActivity.class);
intent.putExtra("notificationId", notificationId);
intent.putExtra("title", tempTitle);
intent.putExtra("content", tempContent);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

PendingIntent pendingIntent = PendingIntent.getActivity(this,
requestCode, intent, PendingIntent.FLAG_UPDATE_CURRENT);
// notification.setLatestEventInfo(this, tempTitle, tempContent,
// pendingIntent);

Notification.Builder builder = new Notification.Builder(this);
builder.setSmallIcon(R.drawable.dog).setTicker(tempContent)
.setDefaults(Notification.DEFAULT_SOUND)
.setContentTitle(tempTitle).setContentText(tempContent)
.setContentIntent(pendingIntent);
Notification notification = builder.build();

notificationManager.notify(notificationId, notification);
}