最近在系统的看android编程，记录一下笔记。Intent的各种用法。

1.显示Intent，SecondActivity不需要任何处理，跳转到SecondActivity。

1 Intent intent = new Intent(FirstActivity.this,SecondActivity.class);2 StartActivity(intent);

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2.显示Intent，SecondActivity设置如下：

1

2

3

4

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FirstActivity发送Intent：

1 Intent intent = new Intent("com.example.activitytest.ACTION_START"/>

2 StartActivity(intent);

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这是隐式Intent的使用方法，这里默认了一个category，也可以自己添加另外的category。上述用于一个APP内的跳转。接下来看看不同应用间的跳转，如下：

1 Intent intent = newIntent(Intent.ACTION_VIEW);2 intent.setData(Uri.parse("http://www.baidu.com"));3 StartActivity(intent);

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使用这个可以打开系统默认浏览器，并访问baidu。

接下来列举一下系统的ACTION：这些是从说明文档里看到的各种系统定义的ACTION和CATEGORY。

Standard Activity Actions

These are the current standard actions that Intent defines for launching activities (usually through startActivity(Intent). The most important, and by far most frequently used, are ACTION_MAIN andACTION_EDIT.

ACTION_MAIN

ACTION_VIEW

ACTION_ATTACH_DATA

ACTION_EDIT

ACTION_PICK

ACTION_CHOOSER

ACTION_GET_CONTENT

ACTION_DIAL

ACTION_CALL

ACTION_SEND

ACTION_SENDTO

ACTION_ANSWER

ACTION_INSERT

ACTION_DELETE

ACTION_RUN

ACTION_SYNC

ACTION_PICK_ACTIVITY

ACTION_SEARCH

ACTION_WEB_SEARCH

ACTION_FACTORY_TEST

Standard Broadcast Actions

These are the current standard actions that Intent defines for receiving broadcasts (usually through registerReceiver(BroadcastReceiver, IntentFilter) or a tag in a manifest).

ACTION_TIME_TICK

ACTION_TIME_CHANGED

ACTION_TIMEZONE_CHANGED

ACTION_BOOT_COMPLETED

ACTION_PACKAGE_ADDED

ACTION_PACKAGE_CHANGED

ACTION_PACKAGE_REMOVED

ACTION_PACKAGE_RESTARTED

ACTION_PACKAGE_DATA_CLEARED

ACTION_UID_REMOVED

ACTION_BATTERY_CHANGED

ACTION_POWER_CONNECTED

ACTION_POWER_DISCONNECTED

ACTION_SHUTDOWN

Standard Categories

These are the current standard categories that can be used to further clarify an Intent via addCategory(String).

CATEGORY_DEFAULT

CATEGORY_BROWSABLE

CATEGORY_TAB

CATEGORY_ALTERNATIVE

CATEGORY_SELECTED_ALTERNATIVE

CATEGORY_LAUNCHER

CATEGORY_INFO

CATEGORY_HOME

CATEGORY_PREFERENCE

CATEGORY_TEST

CATEGORY_CAR_DOCK

CATEGORY_DESK_DOCK

CATEGORY_LE_DESK_DOCK

CATEGORY_HE_DESK_DOCK

CATEGORY_CAR_MODE

CATEGORY_APP_MARKET

Standard Extra Data

These are the current standard fields that can be used as extra data via putExtra(String, Bundle).

EXTRA_ALARM_COUNT

EXTRA_BCC

EXTRA_CC

EXTRA_CHANGED_COMPONENT_NAME

EXTRA_DATA_REMOVED

EXTRA_DOCK_STATE

EXTRA_DOCK_STATE_HE_DESK

EXTRA_DOCK_STATE_LE_DESK

EXTRA_DOCK_STATE_CAR

EXTRA_DOCK_STATE_DESK

EXTRA_DOCK_STATE_UNDOCKED

EXTRA_DONT_KILL_APP

EXTRA_EMAIL

EXTRA_INITIAL_INTENTS

EXTRA_INTENT

EXTRA_KEY_EVENT

EXTRA_ORIGINATING_URI

EXTRA_PHONE_NUMBER

EXTRA_REFERRER

EXTRA_REMOTE_INTENT_TOKEN

EXTRA_REPLACING

EXTRA_SHORTCUT_ICON

EXTRA_SHORTCUT_ICON_RESOURCE

EXTRA_SHORTCUT_INTENT

EXTRA_STREAM

EXTRA_SHORTCUT_NAME

EXTRA_SUBJECT

EXTRA_TEMPLATE

EXTRA_TEXT

EXTRA_TITLE

EXTRA_UID

在接收Intent的过滤器时：一个ACTION，多个CATEGORY，多个DATA。

DATA标签包括：

1. android:scheme

用于指定数据的协议部分，如上例中的 http 部分。

2. android:host

用于指定数据的主机名部分，如上例中的 www.baidu.com 部分。

3. android:port

用于指定数据的端口部分，一般紧随在主机名之后。

4. android:path

用于指定主机名和端口之后的部分，如一段网址中跟在域名之后的内容。

5. android:mimeType

用于指定可以处理的数据类型，允许使用通配符的方式进行指定。

到这里基本的Intent已经介绍完了，接下来是使用Intent来传递数据给下一个Activity.

1 String data = "Hello SecondActivity";2 Intent intent = new Intent(FirstActivity.this, SecondActivity.class);3 intent.putExtra("extra_data", data);4 startActivity(intent);

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1 Intent intent =getIntent();2 String data = intent.getStringExtra("extra_data");3 Log.d("SecondActivity", data);

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还有一种就是FirstActivity需要SecondActivity返回数据。

1 Intent intent = new Intent(FirstActivity.this, SecondActivity.class);2 startActivityForResult(intent, 1);

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1 Intent intent = newIntent();2 intent.putExtra("data_return", "Hello FirstActivity");3 setResult(RESULT_OK, intent);

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1 @Override2 protected void onActivityResult(int requestCode, intresultCode, Intent data) {3 switch(requestCode) {4 case 1:5 if (resultCode ==RESULT_OK) {6 String returnedData = data.getStringExtra("data_return");7 Log.d("FirstActivity", returnedData);8 }9 break;10 default:11 }12 }

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转载于:https://www..com/plmmlp09/p/4221209.html