关于Android里Intent的使用方法

最近在系统的看android编程&＃xff0c;记录一下笔记。Intent的各种用法。

1.显示Intent&＃xff0c;SecondActivity不需要任何处理&＃xff0c;跳转到SecondActivity。

1 Intent intent &＃61; new Intent(FirstActivity.this,SecondActivity.class);
2 StartActivity(intent);

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 2.显示Intent&＃xff0c;SecondActivity设置如下&＃xff1a;

1
2
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4

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FirstActivity发送Intent&＃xff1a;

1 Intent intent &＃61; new Intent("com.example.activitytest.ACTION_START"/>
2 StartActivity(intent);

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这是隐式Intent的使用方法&＃xff0c;这里默认了一个category&＃xff0c;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&＃xff0c;如下&＃xff1a;

1 Intent intent &＃61; new Intent(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&＃xff0c;并访问baidu。

接下来列举一下系统的ACTION&＃xff1a;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&＃xff1a;一个ACTION&＃xff0c;多个CATEGORY&＃xff0c;多个DATA。

DATA标签包括&＃xff1a;

1. android:scheme
用于指定数据的协议部分&＃xff0c;如上例中的 http 部分。
2. android:host
用于指定数据的主机名部分&＃xff0c;如上例中的 www.baidu.com 部分。
3. android:port
用于指定数据的端口部分&＃xff0c;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&＃xff0c;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&＃xff0c;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&＃xff0c;接下来是使用Intent来传递数据给下一个Activity.

1 String data &＃61; "Hello SecondActivity";
2 Intent intent &＃61; new Intent(FirstActivity.this, SecondActivity.class);
3 intent.putExtra("extra_data", data);
4 startActivity(intent);

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1 Intent intent &＃61; getIntent();
2 String data &＃61; 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 &＃61; new Intent(FirstActivity.this, SecondActivity.class);
2 startActivityForResult(intent, 1);

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1 Intent intent &＃61; new Intent();
2 intent.putExtra("data_return", "Hello FirstActivity");
3 setResult(RESULT_OK, intent);

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1 &＃64;Override
2 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
3 switch (requestCode) {
4 case 1:
5 if (resultCode &＃61;&＃61; RESULT_OK) {
6 String returnedData &＃61; data.getStringExtra("data_return");
7 Log.d("FirstActivity", returnedData);
8 }
9 break;
10 default:
11 }
12 }

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