android notification的用法
16lz
2021-01-26
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Notification和NotificationManager的操作相对比较简单,一般用来获取系统级的服务NotificationManager,然后实例化Notification的对象,设置它的一系列属性(比如说图标、时间、标题、内容等),最后通过NotificationManager发出通知即可。
The description from SDK about Notification:
- AclassthatrepresentshowapersistentnotificationistobepresentedtotheuserusingtheNotificationManager.
- TheNotification.BuilderhasbeenaddedtomakeiteasiertoconstructNotifications.
- Foraguidetocreatingnotifications,seetheCreatingStatusBarNotificationsdocumentintheDevGuide.
接下来使用一个简单的案例来演示一下Notification的使用:
首先MainActivity的代码如下:
- publicclassMainActivityextendsActivity{
- privateButtonbtnSend;
- //定义BroadcastReceiver的action
- privatestaticfinalStringNotificationDemo_Action="com.ceo.notification.activity.NotificationDemo_Action";
- /**Calledwhentheactivityisfirstcreated.*/
- @Override
- publicvoidonCreate(BundlesavedInstanceState){
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- //getthewidgets'instance
- getInstance();
- btnSend.setOnClickListener(newView.OnClickListener(){
- @Override
- publicvoidonClick(Viewv){
- Intentintent=newIntent();
- intent.setAction(NotificationDemo_Action);
- sendBroadcast(intent);
- }
- });
- }
- publicvoidgetInstance(){
- btnSend=(Button)findViewById(R.id.btnSend);
- }
- }
相对应的main.xml布局:
- <?xmlversion="1.0"encoding="utf-8"?>
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:gravity="center"
- android:textColor="#EEE"
- android:textStyle="bold"
- android:textSize="25sp"
- android:text="Notification应用的小案例"
- />
- <Button
- android:id="@+id/btnSend"
- android:text="sendnotification"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- />
- </LinearLayout>
SecondActivity的代码如下:
- publicclassSecondActivityextendsActivity{
- privateButtonbtnCancel;
- //声明Notification
- privateNotificationnotification;
- //声明NotificationManager
- privateNotificationManagermNotification;
- //标识Notification的ID
- privatestaticfinalintID=1;
- @Override
- protectedvoidonCreate(BundlesavedInstanceState){
- //TODOAuto-generatedmethodstub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.second);
- getInstance();
- //怎样获得NotificationManager的实例?
- Stringservice=NOTIFICATION_SERVICE;
- mNotification=(NotificationManager)getSystemService(service);
- //获得Notification的实例
- notification=newNotification();
- //设置该图标会在状态栏显示
- inticon=notification.icon=android.R.drawable.stat_notify_chat;
- //设置提示信息
- StringtickerText="TestNotification";
- //设置显示时间
- longwhen=System.currentTimeMillis();
- notification.icon=icon;
- notification.tickerText=tickerText;
- notification.when=when;
- Intentintent=newIntent(this,MainActivity.class);
- PendingIntentpi=PendingIntent.getActivity(this,0,intent,0);
- notification.setLatestEventInfo(this,"消息","HelloAndroid",pi);
- mNotification.notify(ID,notification);
- btnCancel.setOnClickListener(newView.OnClickListener(){
- @Override
- publicvoidonClick(Viewv){
- mNotification.cancel(ID);//--->取消通知
- }
- });
- }
- publicvoidgetInstance(){
- btnCancel=(Button)findViewById(R.id.btnCancel);
- }
- }
相对应的second.xml布局:
- <?xmlversion="1.0"encoding="utf-8"?>
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:gravity="center"
- android:textColor="#EEE"
- android:textStyle="bold"
- android:textSize="25sp"
- android:text="显示通知界面"
- />
- <Button
- android:id="@+id/btnCancel"
- android:text="cancelnotification"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- />
- </LinearLayout>
MyReceiver的代码如下:
- publicclassMyReceiverextendsBroadcastReceiver{
- @Override
- publicvoidonReceive(Contextcontext,Intentintent){
- //实例化Intent
- Intenti=newIntent();
- //在新任务中启动Activity
- i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
- //设置Intent启动的组件名称
- i.setClass(context,SecondActivity.class);
- //启动Activity,显示通知
- context.startActivity(i);
- }
- }
当然不要忘了在AndroidManifest文件中注册广播和Activity等:
- <?xmlversion="1.0"encoding="utf-8"?>
- <manifestxmlns:android="http://schemas.android.com/apk/res/android"
- package="com.ceo.notification.activity"
- android:versionCode="1"
- android:versionName="1.0">
- <applicationandroid:icon="@drawable/icon"android:label="@string/app_name">
- <activityandroid:name=".MainActivity"
- android:label="@string/app_name">
- <intent-filter>
- <actionandroid:name="android.intent.action.MAIN"/>
- <categoryandroid:name="android.intent.category.LAUNCHER"/>
- </intent-filter>
- </activity>
- <receiverandroid:name="MyReceiver">
- <intent-filter>
- <actionandroid:name="com.ceo.notification.activity.NotificationDemo_Action"/>
- </intent-filter>
- </receiver>
- <activityandroid:name=".SecondActivity"></activity>
- </application>
- <uses-sdkandroid:minSdkVersion="8"/>
- </manifest>
最后直接上图:
至此Android中Notification的使用介绍完毕,预祝大家成功。
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