我发现当你在扩展通知中使用操作按钮时,你必须编写额外的代码并且你会受到更多的限制。
在使用扩展通知之前,我的文件下载通知中的默认操作是对文件启动 VIEW 活动。VIEW 意图被选择器意图包裹。我不能直接从通知中为选择器意图使用挂起的意图,因为如果没有查看文件类型的活动,选择器会崩溃。所以我有一个可以启动选择器意图的广播接收器。
通过扩展通知,我决定更改文件下载通知,因此默认操作是显示文件详细信息活动,并带有查看和发送的操作按钮。如 user2536953 所述,从通知启动广播接收器不会关闭通知抽屉。根据他关于活动将关闭抽屉的信息,我将广播接收器更改为没有任何 UI 的 NotificationActivity。
如这篇文章How to dismiss Android notification after action has been clicked中所示,另一个问题是当用户单击操作按钮时,您必须手动取消通知。只有默认操作会自动取消通知。我还在 NotificationActivity 中添加了代码来处理这个问题。
使用查看和发送按钮构建扩展通知:
NotificationCompat.Builder builder = new NotificationCompat.Builder(m_context).setAutoCancel(true);
final PendingIntent contentIntent = DownloadedFileIntentUtils.buildPendingItemDetailIntent(m_context, item);
builder.setContentIntent(contentIntent);
PendingIntent viewIntent = DownloadedFileIntentUtils.buildNotificationActionIntent(m_context, Intent.ACTION_VIEW,
m_context.getString(R.string.action_open), uri, MimeTypeUtil.getMimeType(item), id);
builder.addAction(R.drawable.actionbar_open_with, m_context.getString(R.string.action_open), viewIntent);
PendingIntent sendIntent = DownloadedFileIntentUtils.buildNotificationActionIntent(m_context, Intent.ACTION_SEND,
m_context.getString(R.string.action_send), uri, MimeTypeUtil.getMimeType(item), id);
builder.addAction(R.drawable.actionbar_share, m_context.getString(R.string.action_send), sendIntent);
builder.setTicker(title)
.setContentTitle(title)
.setContentText(text)
.setSmallIcon(R.drawable.notification_download);
.setStyle(new NotificationCompat.BigTextStyle().bigText(text));
getNotificationManager().notify(id, builder.build());
构建从通知操作按钮启动活动的意图:
public static PendingIntent buildNotificationActionIntent(Context context, String action, String actionTitle, Uri uri,
String mimeType, int notificationId) {
// Build the file action intent (e.g. VIEW or SEND) that we eventually want to start.
final Intent fileIntent = buildFileActionIntent(action, actionTitle, uri, mimeType);
// Build the intent to start the NotificationActivity.
final Intent notificationIntent = new Intent(context, NotificationActivity.class);
// This flag must be set on activities started from a notification.
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Pass the file action and notification id to the NotificationActivity.
notificationIntent.putExtra(Intent.EXTRA_INTENT, fileIntent);
notificationIntent.putExtra(IIntentCode.INTENT_EXTRA_NOTIFICATION_ID, notificationId);
// Return a pending intent to pass to the notification manager.
return PendingIntent.getActivity(context, s_intentCode.getAndIncrement(), notificationIntent, PendingIntent.FLAG_ONE_SHOT);
}
public static Intent buildFileActionIntent(String action, String actionTitle,
Uri uri, String mimeType) {
Intent intent = new Intent(action);
intent.addCategory(Intent.CATEGORY_DEFAULT);
if (action.equals(Intent.ACTION_SEND)) {
intent.putExtra(Intent.EXTRA_STREAM, uri);
intent.setType(mimeType);
} else {
intent.setDataAndType(uri, mimeType);
}
intent.putExtra(Intent.EXTRA_TITLE, actionTitle);
// Grant read permission on the file to other apps without declared permission.
int flags = Intent.FLAG_GRANT_READ_URI_PERMISSION;
intent.setFlags(flags);
return intent;
}
没有任何 UI 的通知活动:
public class NotificationActivity extends Activity {
private final static Logger s_logger = LogUtil.getLogger(NotificationActivity.class);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
// Cancel the notification that initiated this activity.
// This is required when using the action buttons in expanded notifications.
// While the default action automatically closes the notification, the
// actions initiated by buttons do not.
int notificationId = intent.getIntExtra(IIntentCode.INTENT_EXTRA_NOTIFICATION_ID, -1);
if (notificationId != -1) {
NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
manager.cancel(notificationId);
}
// If there is an activity to handle the action, start the file action.
if (DownloadedFileIntentUtils.verifyActivityIsAvailable(this, fileActionIntent, false)) {
fileActionIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
DownloadedFileIntentUtils.startFileActionActivity(this, fileActionIntent);
}
// Finish activity.
finish();
}
public static void startFileActionActivity(Context context, Intent fileActionIntent) {
// Start chooser intent.
Intent chooser = Intent.createChooser(fileActionIntent, fileActionIntent.getStringExtra(Intent.EXTRA_TITLE));
// Copy the flags from fileActionIntent to chooser intent.
// FileActionExecutor must set FLAG_ACTIVITY_NEW_TASK on the intent passed to startActivity
// because the flag is required when starting an activity from a context that is not an activity.
chooser.addFlags(fileActionIntent.getFlags());
context.startActivity(chooser);
}
不要忘记将 NotificationActivity 添加到 AndroidManifest.xml。