我可以找到一种方法将参数从我的通知发送到我的活动。
I have a service that creates a notification. When the user clicks on the notification I want to open my main activity with some special parameters. E.g an item id, so my activity can load and present a special item detail view. More specific, I'm downloading a file, and when the file is downloaded I want the notification to have an intent that when clicked it opens my activity in a special mode. I have tried to use putExtra on my intent, but cant seem to extract it, so I think I'm doing it wrong.
我的服务中创建通知的代码:
// construct the Notification object.
final Notification notif = new Notification(R.drawable.icon, tickerText, System.currentTimeMillis());
final RemoteViews contentView = new RemoteViews(context.getPackageName(), R.layout.custom_notification_layout);
contentView.setImageViewResource(R.id.image, R.drawable.icon);
contentView.setTextViewText(R.id.text, tickerText);
contentView.setProgressBar(R.id.progress,100,0, false);
notif.contentView = contentView;
Intent notificationIntent = new Intent(context, Main.class);
notificationIntent.putExtra("item_id", "1001"); // <-- HERE I PUT THE EXTRA VALUE
PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0);
notif.contentIntent = contentIntent;
nm.notify(id, notif);
从我的活动中试图从通知中获取额外参数的代码:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Bundle extras = getIntent().getExtras();
if(extras != null){
Log.i( "dd","Extra:" + extras.getString("item_id") );
}
额外的总是空的，我从来没有得到任何东西到我的日志。
顺便说一句……onCreate只在我的活动开始时运行，如果我的活动已经开始，我也想收集额外的内容，并根据我收到的item_id呈现我的活动。
什么好主意吗?
G'day,
I too can say that I tried everything mentioned in these posts and a few more from elsewhere.
The #1 problem for me was that the new Intent always had a null bundle.
My issue was in focusing too much on the details of "have I included .this or .that".
My solution was in taking a step back from the detail and looking at the overall structure of the notification. When I did that I managed to place the key parts of the code in the correct sequence.
So, if you're having similar issues check for:
1. Intent notificationIntent = new Intent(MainActivity.this, NotificationActivity.class);
2a. Bundle bundle = new Bundle();
//我更喜欢指定数据类型。如bundle.putInt
2b. notificationIntent.putExtras(bundle);
3. PendingIntent contentIntent = PendingIntent.getActivity(MainActivity.this, WIZARD_NOTIFICATION_ID, notificationIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
notificationIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
4. NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
5. NotificationCompat.Builder nBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_notify)
.setContentTitle(title)
.setContentText(content)
.setContentIntent(contentIntent)
.setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE)
.setAutoCancel(false)//false is standard. true == automatically removes the notification when the user taps it.
.setColor(getResources().getColor(R.color.colorPrimary))
.setCategory(Notification.CATEGORY_REMINDER)
.setPriority(Notification.PRIORITY_HIGH)
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC);
notificationManager.notify(WIZARD_NOTIFICATION_ID, nBuilder.build());
通过这个序列，我得到了一个有效的bundle。
在你的通知实现中，使用这样的代码:
NotificationCompat.Builder nBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
...
Intent intent = new Intent(this, ExampleActivity.class);
intent.putExtra("EXTRA_KEY", "value");
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
nBuilder.setContentIntent(pendingIntent);
...
要在ExampleActivity中获取Intent额外值，使用以下代码:
...
Intent intent = getIntent();
if(intent!=null) {
String extraKey = intent.getStringExtra("EXTRA_KEY");
}
...
非常重要的注意:Intent::putExtra()方法是一个重载方法。要获得额外的键，你需要使用Intent::get[Type] extra()方法。
注意:NOTIFICATION_ID和NOTIFICATION_CHANNEL_ID是在ExampleActivity中声明的常量
