关于android4.3中的NotificationListenerService的学习

是这么定义的：

NotificationListenerService ：A service that receives calls from the system when new notifications are posted or removed.

它是一个抽象类：

如果我们要继承NotificationListenerService需要实现其两个方法：onNotificationPosted() 和 onNotificationRemoved()。

另外：

我们需要在manifest文件中声明这个服务权限：BIND_NOTIFICATION_LISTENER_SERVICE，在intent-filter中定义SERVICE_INTERFACE action。

最后，要启动服务，路径是这样的： ”Settings” -> ”Security” -> ”Notification access”。

Example:

SimpleKitkatNotificationListener.java
import android.app.Notification;import android.app.PendingIntent;import android.content.Intent;import android.os.Bundle;import android.service.notification.NotificationListenerService;import android.service.notification.StatusBarNotification;

public class SimpleKitkatNotificationListener extends NotificationListenerService {
@Override    public void onCreate() {        super.onCreate();        //android.os.Debug.waitForDebugger();    }
@Override    public void onNotificationPosted(StatusBarNotification sbn) {        Notification mNotification=sbn.getNotification();        if (mNotification!=null){            Bundle extras = mNotification.extras;
Intent intent = new Intent(MainActivity.INTENT_ACTION_NOTIFICATION);            intent.putExtras(mNotification.extras);            sendBroadcast(intent);
Notification.Action[] mActions=mNotification.actions;            if (mActions!=null){                for (Notification.Action mAction:mActions){                    int icon=mAction.icon;                    CharSequence actionTitle=mAction.title;                    PendingIntent pendingIntent=mAction.actionIntent;                }            }        }    }
@Override    public void onNotificationRemoved(StatusBarNotification sbn) {
}}

MainActivity.java

import android.app.Activity;import android.app.Notification;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.graphics.Bitmap;import android.os.Bundle;import android.view.Menu;import android.view.MenuInflater;import android.view.MenuItem;import android.widget.ImageView;import android.widget.TextView;

public class MainActivity extends Activity {
protected MyReceiver mReceiver = new MyReceiver();    public static String INTENT_ACTION_NOTIFICATION = "it.sorry.notification";
protected TextView title;    protected TextView text;    protected TextView subtext;    protected ImageView largeIcon;
public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);
//Retrieve ui elements        title = (TextView) findViewById(R.id.nt_title);        text = (TextView) findViewById(R.id.nt_text);        subtext = (TextView) findViewById(R.id.nt_subtext);        largeIcon = (ImageView) findViewById(R.id.nt_largeicon);
}
@Override    public boolean onCreateOptionsMenu(Menu menu) {        MenuInflater inflater = getMenuInflater();        inflater.inflate(R.menu.main, menu);        return super.onCreateOptionsMenu(menu);    }
@Override    public boolean onOptionsItemSelected(MenuItem item) {        switch (item.getItemId()) {            case R.id.action_autorize:                Intent intent = new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS");                startActivity(intent);                return true;        }        return super.onOptionsItemSelected(item);    }
@Override    protected void onResume() {        super.onResume();        if (mReceiver == null) mReceiver = new MyReceiver();        registerReceiver(mReceiver, new IntentFilter(INTENT_ACTION_NOTIFICATION));    }
@Override    protected void onPause() {        super.onPause();        unregisterReceiver(mReceiver);    }
public class MyReceiver extends BroadcastReceiver {
@Override        public void onReceive(Context context, Intent intent) {
if (intent != null) {                Bundle extras = intent.getExtras();                String notificationTitle = extras.getString(Notification.EXTRA_TITLE);                int notificationIcon = extras.getInt(Notification.EXTRA_SMALL_ICON);                Bitmap notificationLargeIcon = ((Bitmap) extras.getParcelable(Notification.EXTRA_LARGE_ICON));                CharSequence notificationText = extras.getCharSequence(Notification.EXTRA_TEXT);                CharSequence notificationSubText = extras.getCharSequence(Notification.EXTRA_SUB_TEXT);
title.setText(notificationTitle);                text.setText(notificationText);                subtext.setText(notificationSubText);
if (notificationLargeIcon != null) {                    largeIcon.setImageBitmap(notificationLargeIcon);                }            }
}    }}