Intent和Intent Filter Context

http://www.android-doc.com/reference/android/content/Intent.html

An intent is an abstract description of an operation to be performed. It can be used with startActivity to launch an Activity, broadcastIntent to send it to any interested BroadcastReceiver components, and startService(Intent) or bindService(Intent, ServiceConnection, int) to communicate with a background Service.

intent:一个操作（operation）的抽象描述；执行这个操作，可以激活这个操作对应的组件；

是android模块化编程的关键，实现了各个模块的解耦。

intent:编程api；

intent-filter：给系统使用；app给系统提供的信息。

intent内部最重要的变量：
private ComponentName mComponent;

Context:

public void startActivity(Intent intent) {
    mBase.startActivity(intent);
}

public void sendBroadcast(Intent intent) {
    mBase.sendBroadcast(intent);
}
public ComponentName startService(Intent service) {

    return mBase.startService(service);
}