如何创建一个Android意图承载的数据？ [英] How do I create an android Intent that carries data?

问题描述

我可能误会了怎么意图都被认为是使用，所以我可能会在这里问错了东西。如果是这样的话，请帮我在正确的轨道与此反正...

I might have misunderstood how intents are supposed to be used, so I might be asking the wrong thing here. If that's the case, please help me get on the right track with this anyway...

我刚刚开始工作在Android应用程序，将轮询我的服务器消息每隔一段时间，当一个新的消息是可用的，我想把它显示给用户。我试图通过具有服务来实现这个是轮询服务器，并在接收到新信息的服务应该给消息发送给活动显示它。

I've just started working on an android app that will poll my server for messages every so often, and when a new message is available, I want to show it to the user. I'm trying to implement this by having a Service that polls the server, and when a new message is received the service should give the message to an Activity that shows it.

要促进这种沟通，我试图创建一个意图与 ACTION_VIEW ，但我不能弄清楚如何给邮件活动。请问有没有办法通过一个字符串或通过一个意图常规的Java对象？

To facilitate this communication, I'm trying to create an Intent with ACTION_VIEW, but I can't figure out how to give the message to the activity. Is there no way to pass a string or a regular Java object via the intent?

有关它的价值，这就是我想要做的：

For what it's worth, this is what I'd like to do:

getApplication().startActivity(new Intent(MessageService.this, ViewMessageActivity.class, message));

但当然，这还不编译。

but of course, that doesn't even compile.

推荐答案

使用的意图包中添加额外的信息，像这样：

Use the Intent bundle to add extra information, like so:

Intent i = new Intent(MessageService.this, ViewMessageActivity.class);
i.putExtra("name", "value");

和接收端：

String extra = i.getStringExtra("name");

或者，让所有的演员独立的类型为一扎，：

Or, to get all the extras as a bundle, independently of the type:

Bundle b = i.getExtras();

有各种签名的 putExtra（）方法和各种方法来获取数据，根据其类型。你可以在这里看到更多：意图，<一个href="http://developer.android.com/reference/android/content/Intent.html#putExtra%28java.lang.String,%20double%5B%5D%29">putExtra.

There are various signatures for the putExtra() method and various methods to get the data depending on its type. You can see more here: Intent, putExtra.

编辑：：要传递的对象必须实现 Parcelable上或序列化，这样你就可以使用下面的签名之一：

To pass on an object it must implement Parcelable or Serializable, so you can use one of the following signatures:

<一个href="http://developer.android.com/reference/android/content/Intent.html#putExtra%28java.lang.String,%20java.io.Serializable%29">putExtra(String名称，序列化值）

<一个href="http://developer.android.com/reference/android/content/Intent.html#putExtra%28java.lang.String,%20android.os.Parcelable%29">putExtra(String名，Parcelable值）

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