1.1.4 Getting Started_Budding Your First App_Starting Another Activity

An Intent is an object that provides runtime binding between separate components (such as two activities). The intent represents an app’s "intent to do something." You can use intents for a wide variety of tasks, but most often they’re used to start another activity.

Intent 是这样一个东西：它在不同的组件（如两个 activity）间提供运行时的绑定。intent 表示一个app“想要去做什么的意图”。你可以使用intent去做很多类型的任务，但通常它被用来启动另一个 activity

Inside the sendMessage() method, create an Intent to start an activity called DisplayMessageActivity:

Intent intent =newIntent(this,DisplayMessageActivity.class);

The constructor used here takes two parameters:

• A Context as its first parameter (this is used because the Activity class is a subclass of Context)
• The Class of the app component to which the system should deliver the Intent (in this case, the activity that should be started)

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