Android 使用BigView樣式

編寫:fastcome1985 - 原文:http://developer.android.com/training/notify-user/expanded.html

Notification抽屜中的Notification主要有兩種視覺展示形式，normal view（平常的視圖，下同） 與 big view（大視圖，下同）。Notification的 big view樣式只有當(dāng)Notification被擴(kuò)展時(shí)才能出現(xiàn)。當(dāng)Notification在Notification抽屜的最上方或者用戶點(diǎn)擊Notification時(shí)才會(huì)展現(xiàn)大視圖。

Big views在Android4.1被引進(jìn)的，它不支持老版本設(shè)備。這節(jié)課叫你如何讓把big view notifications合并進(jìn)你的APP，同時(shí)提供normal view的全部功能。更多信息請(qǐng)見Notifications API guide 。

這是一個(gè) normal view的例子

圖1 Normal view notification.

這是一個(gè) big view的例子

圖2 Big view notification.

在這節(jié)課的例子應(yīng)用中， normal view 與 big view給用戶相同的功能：

• 繼續(xù)小睡或者消除Notification
• 一個(gè)查看用戶設(shè)置的類似計(jì)時(shí)器的提醒文字的方法，

• normal view 通過當(dāng)用戶點(diǎn)擊Notification來啟動(dòng)一個(gè)新的activity的方式提供這些特性，記住當(dāng)你設(shè)計(jì)你的notifications時(shí)，首先在normal view 中提供這些功能，因?yàn)楹芏嘤脩魰?huì)與notification交互。

設(shè)置Notification用來登陸一個(gè)新的Activity

這個(gè)例子應(yīng)用用IntentService的子類（PingService）來構(gòu)造以及發(fā)布notification。 在這個(gè)代碼片段中，IntentService中的方法onHandleIntent()) 指定了當(dāng)用戶點(diǎn)擊notification時(shí)啟動(dòng)一個(gè)新的activity。方法setContentIntent())定義了pending intent在用戶點(diǎn)擊notification時(shí)被激發(fā)，因此登陸這個(gè)activity.

Intent resultIntent = new Intent(this, ResultActivity.class);
resultIntent.putExtra(CommonConstants.EXTRA_MESSAGE, msg);
resultIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
        Intent.FLAG_ACTIVITY_CLEAR_TASK);

// Because clicking the notification launches a new ("special") activity,
// there's no need to create an artificial back stack.
PendingIntent resultPendingIntent =
         PendingIntent.getActivity(
         this,
         0,
         resultIntent,
         PendingIntent.FLAG_UPDATE_CURRENT
);

// This sets the pending intent that should be fired when the user clicks the
// notification. Clicking the notification launches a new activity.
builder.setContentIntent(resultPendingIntent);

構(gòu)造big view

這個(gè)代碼片段展示了如何在big view中設(shè)置buttons

// Sets up the Snooze and Dismiss action buttons that will appear in the
// big view of the notification.
Intent dismissIntent = new Intent(this, PingService.class);
dismissIntent.setAction(CommonConstants.ACTION_DISMISS);
PendingIntent piDismiss = PendingIntent.getService(this, 0, dismissIntent, 0);

Intent snoozeIntent = new Intent(this, PingService.class);
snoozeIntent.setAction(CommonConstants.ACTION_SNOOZE);
PendingIntent piSnooze = PendingIntent.getService(this, 0, snoozeIntent, 0);

這個(gè)代碼片段展示了如何構(gòu)造一個(gè)Builder對(duì)象，它設(shè)置了big view 的樣式為"big text",同時(shí)設(shè)置了它的內(nèi)容為提醒文字。它使用addAction())方法來添加將要在big view中出現(xiàn)的Snooze與Dismiss按鈕（以及它們相關(guān)聯(lián)的pending intents).

// Constructs the Builder object.
NotificationCompat.Builder builder =
        new NotificationCompat.Builder(this)
        .setSmallIcon(R.drawable.ic_stat_notification)
        .setContentTitle(getString(R.string.notification))
        .setContentText(getString(R.string.ping))
        .setDefaults(Notification.DEFAULT_ALL) // requires VIBRATE permission
        /*
         * Sets the big view "big text" style and supplies the
         * text (the user's reminder message) that will be displayed
         * in the detail area of the expanded notification.
         * These calls are ignored by the support library for
         * pre-4.1 devices.
         */
        .setStyle(new NotificationCompat.BigTextStyle()
                .bigText(msg))
        .addAction (R.drawable.ic_stat_dismiss,
                getString(R.string.dismiss), piDismiss)
        .addAction (R.drawable.ic_stat_snooze,
                getString(R.string.snooze), piSnooze);