Android入门笔记 - 界面开发 - Notification, NotificationManager - android

今天来接触一下android里的通知：

Notification
NotificationManager

里面涉及到两个activity，所以又两个layout文件，一个是主程序的，一个是点击通知栏图标之后弹出的activity，直接上代码：

1. res/layout/activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="点击按钮，发送通知"/>    <Button         android:id="@+id/btn1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button1"/>    </LinearLayout>

2. res/layout/activity_notification.xml ：点击通知跳转页面

<?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:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="通知消息界面"        android:textSize="30sp" /></LinearLayout>

3. src/MainActivity.java

package com.example.demoui5_notification;import android.os.Bundle;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.view.Menu;import android.view.View;import android.widget.Button;public class MainActivity extends Activity {private Context ctx = this;private Button mBtn1;private NotificationManager notificationManager;private Notification notification;private PendingIntent pendingIntent;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);Intent intent = new Intent(MainActivity.this, NotificationActivity.class);pendingIntent = PendingIntent.getActivity(ctx, 0, intent, 0);notification = new Notification();mBtn1 = (Button) findViewById(R.id.btn1);mBtn1.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {notification.icon = R.drawable.ic_launcher;notification.tickerText = "Button1的通知消息";notification.defaults = Notification.DEFAULT_SOUND;notification.setLatestEventInfo(ctx, "Button1", "Button1通知", pendingIntent);notificationManager.notify(0, notification);}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

4. src/ NotificationActivity.java

package com.example.demoui5_notification;import android.app.Activity;import android.os.Bundle;public class NotificationActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_notification);}}

这个实例很简单，就是点击Button1按钮，然后会在屏幕上方有一个通知，点击通知之后跳转到宁外一个页面。

关键使用到的组件是：NotificationManager 和 Notification， PendingIntent是对Intent的扩展。我们来看一看用法：

notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);Intent intent = new Intent(MainActivity.this, NotificationActivity.class);pendingIntent = PendingIntent.getActivity(ctx, 0, intent, 0);notification = new Notification();mBtn1 = (Button) findViewById(R.id.btn1);mBtn1.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {notification.icon = R.drawable.ic_launcher;notification.tickerText = "Button1的通知消息";notification.defaults = Notification.DEFAULT_SOUND;notification.setLatestEventInfo(ctx, "Button1", "Button1通知", pendingIntent);notificationManager.notify(0, notification);}});

先通过 getSystemService(NOTIFICATION_SERVICE)得到通知管理者，由于点击通知发送的intent与直接在activity里发送intent是不一样的，所以这里用到了PendingIntent，构造方式如上。然后就是构造通知对象（Notification），可以设置icon，标题栏显示的文字，声音，以及下拉标题栏时显示的通知样式，还需要将pendingIntent与其绑定。

最后就是manager来notify一个Notification，好了，完成。

Android入门笔记 - 界面开发 - Notification, NotificationManager

1. res/layout/activity_main.xml

2. res/layout/activity_notification.xml ：点击通知跳转页面

3. src/MainActivity.java

4. src/ NotificationActivity.java

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