android Notification和NotificationManager的使用

Notification和NotificationManager

1.Broadcast Receiver組件沒有提供可視化的界面來顯示廣播信息。這裏咱們能夠使用Notification和NotificationManager來實現可視化的信息顯示。經過使用它們咱們能夠顯示廣播信息的內容，圖標

以及震動等信息。

2.使用Notification和NotificationManager也比較簡單，通常得到系統級的服務NotificationManager，而後實例化Notification，設置其屬性，經過NotificationManager發出通知就能夠了。

基本步驟以下：

　　1）得到系統級的服務NotificationManager，這裏比較簡單，經過Context.getSystemService()方法便可實現。

1 String service = Notification;
2 NotificationManager nm = (NotificationManager)getSystemService(service);

　　2)實例化Notification對象，並設置其屬性。

//實例化Notification
Notification n = new Notification();
//誰知顯示圖標，圖標會在狀態欄顯示
int icon = n.icon = R.drawable.icon;
//設置顯示提示信息，
String tickrtText = "Test Notification";
//顯示時間
long when = System.currentTimeMills();
n.icon = icon;
n.tickerText = tickerText;
n.when = when;

　　3)調用setLatestEcentInfo()方法在視圖中設置圖標和時間

　　//實例化Intent

Intent intent = new Intent(this,MainActivity.class);
//得到 PendingIntent
PendingIntent  pi = PendingIntent  .getActivity(this,0,intent,0);
//設置時間信息
n.setLastEventInfo(this,"My content" , "My Content" , pi);

　　4)發出通知

//表示該通知的ID
int ID = 1;
//發出通知
nm.notify(ID,n);

3.下面直接經過一個例子來講明

 MainActivity:

 1 public class MainActivity extends Activity {
 2 
 3     private Button btn_send;
 4     String MY_ACTION = "com.example.notification.MY_ACTION";
 5 
 6     @Override
 7     protected void onCreate(Bundle savedInstanceState) {
 8         super.onCreate(savedInstanceState);
 9         setContentView(R.layout.activity_main);
10 
11         btn_send = (Button) findViewById(R.id.btn_send);
12         btn_send.setOnClickListener(new Button.OnClickListener() {
13 
14             @Override
15             public void onClick(View v) {
16                 Intent i = new Intent();
17                 i.putExtra("message","接收到消息");
18                 i.setAction(MY_ACTION);
19                 sendBroadcast(i);
20             }
21         });
22 
23     }
24 }

MyBroadCast(必定記住在manifest.xml中申明broadcast):

 1 public class myBroadCast extends BroadcastReceiver {
 2 
 3     public myBroadCast() {
 4     }
 5 
 6     @Override
 7     public void onReceive(Context context, Intent intent) {
 8 
 9         Intent i = new Intent();
10         i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
11         Log.e("message", intent.getStringExtra("message"));
12         i.putExtra("message", intent.getStringExtra("message"));
13         i.setClass(context, SecondActivity.class);
14         context.startActivity(i);
15 
16     }
17 }

SecondActivity:

 1 protected void onCreate(Bundle savedInstanceState) {
 2         super.onCreate(savedInstanceState);
 3         setContentView(R.layout.activity_second);
 4         btnStop = (Button) findViewById(R.id.btn_cancel);
 5         tvShow = (TextView) findViewById(R.id.tv_showText);
 6         nm = (NotificationManager) this.getSystemService(NOTIFICATION_SERVICE);
 7 
 8         notification = new Notification();
 9         notification.icon = R.drawable.ic_launcher;
10         notification.defaults |= Notification.DEFAULT_SOUND;
11         long when = System.currentTimeMillis();
12         String tickerText = "Test Notification";
13         notification.tickerText = tickerText;
14         notification.when = when;
15         // 實例化Intent
16         Intent intent = new Intent(this, MainActivity.class); // 點擊通知後要轉向的界面
17         // 得到pendingIntent
18         PendingIntent pi = PendingIntent.getActivity(this, 0, intent, 0);
19         // 設置事件信息
20         notification.setLatestEventInfo(this, "My titlk", "My content", pi);
21 
22         new Thread() {
23             @Override
24             public void run() {
25                 while (true) {
26                     try {
27                         Thread.sleep(1000);
28                         handler.sendEmptyMessage(0);
29 
30                     } catch (InterruptedException e) {
31                         // TODO Auto-generated catch block
32                         e.printStackTrace();
33                     }
34 
35                 }
36             }
37 
38         }.start();
39 
40         btnStop.setOnClickListener(new Button.OnClickListener() {
41 
42             @Override
43             public void onClick(View v) {
44                 nm.cancel(1);
45             }
46         });
47 
48     }
49 
50     Handler handler = new Handler() {
51         @Override
52         public void handleMessage(Message msg) {
53             nm.notify(1, notification);
54 
55         }
56 
57     };
58 }

                       

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