android-Intents and Intent Filters and Common Intents

You can deliver a broadcast to other apps by passing an

Intent

to

sendBroadcast()

,

sendOrderedBroadcast()

,
or

sendStickyBroadcast()

.

Without a component name, the intent is implicit and
the system decides which component should receive the intent based on the other intent information (such as the action, data, and category—described below).

显示的意图和隐示的意图

<action>

Declares the intent action accepted, in the

name

attribute. The value must be the literal string value of an action, not the class constant.

<data>

Declares the type of data accepted, using one or more attributes that specify various aspects of the data URI (

scheme

,

host

,

port

,

path

, etc.) and MIME type.

<category>

Declares the intent category accepted, in the

name

attribute. The value must be the literal string value of an action, not the class constant.
For all activities, you must declare your intent filters in the manifest file.

PendingIntent.getActivity()

for
an

Intent

that starts an

Activity

.

PendingIntent.getService()

for
an

Intent

that starts a

Service

.

PendingIntent.getBroadcast()

for
a

Intent

that starts an

BroadcastReceiver

.