创建android Notification

说明：
根据项目选择的基础sdk，选择不同的创建Notification的方法
1 在android sdk 3.0 之前直接通过 new Notification的方法直接创建通知对象

2 在android sdk 3.0 是通过Notification.Builer的方法间接配置Notification的属性和创建Notification的功能

3 在android sdk4.0以上是通过android-support-v4.jar 包中的NotificationCompat.Builder类，进行配置创建Notification对象

下面是一个实例，用NotificationCompat.Builder的方式创建Notification

NotificationCompat.Builder mBuilder =                new NotificationCompat.Builder(this)                .setSmallIcon(R.drawable.ic_launcher)                .setContentTitle("My notification")                .setContentText("Hello World!");                //Notification.Builder builder=new Notification.Builder(this);                 mBuilder.setAutoCancel(true);        mBuilder.setLights(Color.BLUE, 500, 500);        long[] pattern = {500,500,500,500,500,500};        mBuilder.setVibrate(pattern);                Uri sound = Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.messagevoice);        mBuilder.setSound(sound);        //mBuilder.setSound(sound);        // Creates an explicit intent for an Activity in your app        Intent resultIntent = new Intent(this, MessageShowActivity.class);        // The stack builder object will contain an artificial back stack for the        // started Activity.        // This ensures that navigating backward from the Activity leads out of        // your application to the Home screen.        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);        // Adds the back stack for the Intent (but not the Intent itself)        //stackBuilder.addParentStack(MessageShowActivity.class);        // Adds the Intent that starts the Activity to the top of the stack        stackBuilder.addNextIntent(resultIntent);        PendingIntent resultPendingIntent =                PendingIntent.getActivity(this, 0, new Intent(this,MessageShowActivity.class), 0);                mBuilder.setContentIntent(resultPendingIntent);        NotificationManager mNotificationManager =            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);        // mId allows you to update the notification later on.        mNotificationManager.notify(12, mBuilder.build());

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