Android开发学习之路--Notification之初体验
一般当我们收到短信啊,微信啊,或者有些app的提醒。我们都会在通知栏收到一天简单的消息,然后点击消息进入到app里面,事实上android中有专门的Notification的类能够完毕这个工作,这里就实现下这个功能。
首先新建NotificationTestproject,然后加入一个button,用来触发通知。然后编写代码例如以下:
package com.example.jared.notificationtest; import android.app.NotificationManager; import android.os.Bundle; import android.support.v4.app.NotificationCompat; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { private Button sendNotificationBtn; private int mId = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sendNotificationBtn = (Button)findViewById(R.id.sendNotification); sendNotificationBtn.setOnClickListener(new myOnClickListener()); } private class myOnClickListener implements View.OnClickListener { @Override public void onClick(View view) { switch (view.getId()) { case R.id.sendNotification: setSendNotificationBtn(); break; default: break; } } } public void setSendNotificationBtn () { NotificationCompat.Builder notification = new NotificationCompat.Builder(this) .setSmallIcon(R.mipmap.ic_launcher) .setContentTitle("My Notification") .setContentText("Hello Notification"); NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); manager.notify(mId, notification.build()); } }
这里了用了NotificatonCompat.Builder来创建一个简单的Notification,setSmallIcon是指定当中的图标,setContentTitle方法是指定标题,setContentText指定内容,然后通过getSystemService获取通知的管理类,通过notify方法发送通知,当中mId是一个id号,每个通知有其独特的通知号。不能反复。
执行效果例如以下所看到的:
接着我们来实现点击通知后跳转到相应的Activity中,然后消除这条通知。再创建一个Activity,布局例如以下:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.jared.notificationtest.Notification"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="欢迎点击通知事件!" android:layout_margin="20dp" android:textSize="20dp"/> </LinearLayout>
这里就一个textview用来显示下信息,接着编写代码例如以下:
package com.example.jared.notificationtest; import android.app.NotificationManager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; public class Notification extends AppCompatActivity { private int mId = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_notification); NotificationManager manager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE); manager.cancel(mId); } }这里进入到Activity后就把通知清除掉,接着就是改动MainActivity代码:
package com.example.jared.notificationtest; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.NotificationCompat; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { private Button sendNotificationBtn; private int mId = 1; private int numMessage = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sendNotificationBtn = (Button)findViewById(R.id.sendNotification); sendNotificationBtn.setOnClickListener(new myOnClickListener()); } private class myOnClickListener implements View.OnClickListener { @Override public void onClick(View view) { switch (view.getId()) { case R.id.sendNotification: setSendNotificationBtn(); break; default: break; } } } public void setSendNotificationBtn () { NotificationCompat.Builder notification = new NotificationCompat.Builder(this) .setSmallIcon(R.mipmap.ic_launcher) .setContentTitle("My Notification") .setContentText("Hello Notification") .setNumber(++numMessage); Intent intent = new Intent(this, Notification.class); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT); notification.setContentIntent(pendingIntent); NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); manager.notify(mId, notification.build()); } }
这里又加入了setNumber方法。主要是显示来了几条通知,比方微信中就须要知道,然后实例化了一个intent。再实例化一个pendingIntent。获取activity,在NotificationCompat.Builder里setContentIntent。之后就能够达到我们的效果,执行并点击通知例如以下所看到的:
如上所看到的收到了6条通知,然后点击后通知也消除了。
一般在下载歌曲啊。图片啊的时候。会有进度条表示下载的过程,这里来模拟实现下这个功能。改动MainAcitivy代码例如以下:
package com.example.jared.notificationtest; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.NotificationCompat; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { private static final String TAG = "MainActivity"; private Button sendNotificationBtn; private int mId = 1; private int numMessage = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sendNotificationBtn = (Button)findViewById(R.id.sendNotification); sendNotificationBtn.setOnClickListener(new myOnClickListener()); } private class myOnClickListener implements View.OnClickListener { @Override public void onClick(View view) { switch (view.getId()) { case R.id.sendNotification: setSendNotificationBtn(); break; default: break; } } } public void setSendNotificationBtn () { final NotificationCompat.Builder notification = new NotificationCompat.Builder(this) .setSmallIcon(R.mipmap.ic_launcher) .setContentTitle("Music Download") .setContentText("burning.mp3") .setNumber(++numMessage); Intent intent = new Intent(this, Notification.class); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT); notification.setContentIntent(pendingIntent); final NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); new Thread( new Runnable(){ @Override public void run() { for(int cnt=0; cnt<=100; cnt++){ notification.setProgress(100, cnt, false); manager.notify(mId, notification.build()); try { Thread.sleep(200); } catch (InterruptedException e) { Log.d(TAG, "Sleep failure"); } } notification.setContentText("Download complete"); notification.setProgress(0, 0, false); manager.notify(mId, notification.build()); } } ).start(); } }
这里通过setProgress方法来实现,这里开了一个Thread,当下载完毕后又一次设置下内容。
执行结果例如以下:
图1显示运行进度条在走,图2完毕了下载功能。
一般收到通知,手机都会有一段声音。加上震动。那么接下来来实现这个功能。上图,假设下载完毕后,就放一段音乐而且震动,改动代码例如以下:
package com.example.jared.notificationtest; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.NotificationCompat; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.Button; import java.io.File; public class MainActivity extends AppCompatActivity { private static final String TAG = "MainActivity"; private Button sendNotificationBtn; private int mId = 1; private int numMessage = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sendNotificationBtn = (Button)findViewById(R.id.sendNotification); sendNotificationBtn.setOnClickListener(new myOnClickListener()); } private class myOnClickListener implements View.OnClickListener { @Override public void onClick(View view) { switch (view.getId()) { case R.id.sendNotification: setSendNotificationBtn(); break; default: break; } } } public void setSendNotificationBtn () { final NotificationCompat.Builder notification = new NotificationCompat.Builder(this) .setSmallIcon(R.mipmap.ic_launcher) .setContentTitle("Music Download") .setContentText("burning.mp3") .setNumber(++numMessage); Intent intent = new Intent(this, Notification.class); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT); notification.setContentIntent(pendingIntent); final NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); new Thread( new Runnable(){ @Override public void run() { for(int cnt=0; cnt<=100; cnt++){ notification.setProgress(100, cnt, false); manager.notify(mId, notification.build()); try { Thread.sleep(100); } catch (InterruptedException e) { Log.d(TAG, "Sleep failure"); } } notification.setContentText("Download complete"); notification.setProgress(0, 0, false); Uri soundUri = Uri.fromFile(new File("/system/media/audio/animationsounds/bootSound.ogg")); notification.setSound(soundUri); long[] vibrates = {0, 1000, 1000, 1000}; notification.setVibrate(vibrates); manager.notify(mId, notification.build()); } } ).start(); } }
这里加上了setSound和setVibrate方法,而且须要在AndroidManifest中加入权限:
<uses-permission android:name="android.permission.VIBRATE"/>
这里的歌曲名是通过adb shell查看系统的存在的音乐:
当然还能够控制led灯,不知为啥led灯的效果一直没有,网上翻阅非常多资料也没找到问题所在,若有朋友知道。麻烦告知一二不甚感激。
notification.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)); long[] vibrates = {0, 1000, 1000, 1000}; notification.setVibrate(vibrates); notification.setLights(Color.GREEN, 1000, 1000);关于Notification基本上就学到这里了。