WifiManager类详解

public class

WifiManager

extends  Object

java.lang.Object
↳	android.net.wifi.WifiManager

类概述

This class provides the primary API for managing all aspects of Wi-Fi connectivity. Get an instance of this class by calling Context.getSystemService(Context.WIFI_SERVICE). It deals with several categories of items:

• The list of configured networks. The list can be viewed and updated, and attributes of individual entries can be modified.
• The currently active Wi-Fi network, if any. Connectivity can be established or torn down, and dynamic information about the state of the network can be queried.
• Results of access point scans, containing enough information to make decisions about what access point to connect to.
• It defines the names of various Intent actions that are broadcast upon any sort of change in Wi-Fi state.

This is the API to use when performing Wi-Fi specific operations. To perform operations that pertain to network connectivity at an abstract level, use  ConnectivityManager.

摘要

嵌套类
class	WifiManager.MulticastLock	Allows an application to receive Wifi Multicast packets.
class	WifiManager.WifiLock	Allows an application to keep the Wi-Fi radio awake.

常量
String	ACTION_PICK_WIFI_NETWORK	Activity Action: Pick a Wi-Fi network to connect to.
int	ERROR_AUTHENTICATING	The error code if there was a problem authenticating.
String	EXTRA_BSSID	The lookup key for a String giving the BSSID of the access point to which we are connected.
String	EXTRA_NETWORK_INFO	The lookup key for a NetworkInfo object associated with the Wi-Fi network.
String	EXTRA_NEW_RSSI	The lookup key for an int giving the new RSSI in dBm.
String	EXTRA_NEW_STATE	The lookup key for a SupplicantState describing the new state Retrieve with getParcelableExtra(String).
String	EXTRA_PREVIOUS_WIFI_STATE	The previous Wi-Fi state.
String	EXTRA_SUPPLICANT_CONNECTED	The lookup key for a boolean that indicates whether a connection to the supplicant daemon has been gained or lost.
String	EXTRA_SUPPLICANT_ERROR	The lookup key for a SupplicantState describing the supplicant error code if any Retrieve with getIntExtra(String, int).
String	EXTRA_WIFI_STATE	The lookup key for an int that indicates whether Wi-Fi is enabled, disabled, enabling, disabling, or unknown.
String	NETWORK_IDS_CHANGED_ACTION	The network IDs of the configured networks could have changed.
String	NETWORK_STATE_CHANGED_ACTION	Broadcast intent action indicating that the state of Wi-Fi connectivity has changed.
String	RSSI_CHANGED_ACTION	The RSSI (signal strength) has changed.
String	SCAN_RESULTS_AVAILABLE_ACTION	An access point scan has completed, and results are available from the supplicant.
String	SUPPLICANT_CONNECTION_CHANGE_ACTION	Broadcast intent action indicating that a connection to the supplicant has been established (and it is now possible to perform Wi-Fi operations) or the connection to the supplicant has been lost.
String	SUPPLICANT_STATE_CHANGED_ACTION	Broadcast intent action indicating that the state of establishing a connection to an access point has changed.One extra provides the new SupplicantState.
int	WIFI_MODE_FULL	In this Wi-Fi lock mode, Wi-Fi will be kept active, and will behave normally, i.e., it will attempt to automatically establish a connection to a remembered access point that is within range, and will do periodic scans if there are remembered access points but none are in range.
int	WIFI_MODE_SCAN_ONLY	In this Wi-Fi lock mode, Wi-Fi will be kept active, but the only operation that will be supported is initiation of scans, and the subsequent reporting of scan results.
String	WIFI_STATE_CHANGED_ACTION	Broadcast intent action indicating that Wi-Fi has been enabled, disabled, enabling, disabling, or unknown.
int	WIFI_STATE_DISABLED	Wi-Fi is disabled.
int	WIFI_STATE_DISABLING	Wi-Fi is currently being disabled.
int	WIFI_STATE_ENABLED	Wi-Fi is enabled.
int	WIFI_STATE_ENABLING	Wi-Fi is currently being enabled.
int	WIFI_STATE_UNKNOWN	Wi-Fi is in an unknown state.

公有方法
int	addNetwork( WifiConfiguration config) Add a new network description to the set of configured networks.
static int	calculateSignalLevel(int rssi, int numLevels) Calculates the level of the signal.
static int	compareSignalLevel(int rssiA, int rssiB) Compares two signal strengths.
WifiManager.MulticastLock	createMulticastLock( String tag) Create a new MulticastLock
WifiManager.WifiLock	createWifiLock(int lockType,  String tag) Creates a new WifiLock.
WifiManager.WifiLock	createWifiLock( String tag) Creates a new WifiLock.
boolean	disableNetwork(int netId) Disable a configured network.
boolean	disconnect() Disassociate from the currently active access point.
boolean	enableNetwork(int netId, boolean disableOthers) Allow a previously configured network to be associated with.
List< WifiConfiguration>	getConfiguredNetworks() Return a list of all the networks configured in the supplicant.
WifiInfo	getConnectionInfo() Return dynamic information about the current Wi-Fi connection, if any is active.
DhcpInfo	getDhcpInfo() Return the DHCP-assigned addresses from the last successful DHCP request, if any.
List< ScanResult>	getScanResults() Return the results of the latest access point scan.
int	getWifiState() Gets the Wi-Fi enabled state.
boolean	isWifiEnabled() Return whether Wi-Fi is enabled or disabled.
boolean	pingSupplicant() Check that the supplicant daemon is responding to requests.
boolean	reassociate() Reconnect to the currently active access point, even if we are already connected.
boolean	reconnect() Reconnect to the currently active access point, if we are currently disconnected.
boolean	removeNetwork(int netId) Remove the specified network from the list of configured networks.
boolean	saveConfiguration() Tell the supplicant to persist the current list of configured networks.
boolean	setWifiEnabled(boolean enabled) Enable or disable Wi-Fi.
boolean	startScan() Request a scan for access points.
int	updateNetwork( WifiConfiguration config) Update the network description of an existing configured network.

[展开] 继承的方法
来自 class java.lang.Object

常量

public static final String ACTION_PICK_WIFI_NETWORK

引入自： API 级别1

Activity Action: Pick a Wi-Fi network to connect to.

Input: Nothing.

Output: Nothing.

常量值： "android.net.wifi.PICK_WIFI_NETWORK"

public static final int ERROR_AUTHENTICATING

引入自： API 级别1

The error code if there was a problem authenticating.

常量值： 1 (0x00000001)

public static final String EXTRA_BSSID

引入自： API 级别1

The lookup key for a String giving the BSSID of the access point to which we are connected. Only present when the new state is CONNECTED. Retrieve with getStringExtra(String).

常量值： "bssid"

public static final String EXTRA_NETWORK_INFO

引入自： API 级别1

The lookup key for a NetworkInfo object associated with the Wi-Fi network. Retrieve with getParcelableExtra(String).

常量值： "networkInfo"

public static final String EXTRA_NEW_RSSI

引入自： API 级别1

The lookup key for an int giving the new RSSI in dBm.

常量值： "newRssi"

public static final String EXTRA_NEW_STATE

引入自： API 级别1

The lookup key for a SupplicantState describing the new state Retrieve with getParcelableExtra(String).

常量值： "newState"

public static final String EXTRA_PREVIOUS_WIFI_STATE

引入自： API 级别1

The previous Wi-Fi state.

参见

• EXTRA_WIFI_STATE

常量值： "previous_wifi_state"

public static final String EXTRA_SUPPLICANT_CONNECTED

引入自： API 级别1

The lookup key for a boolean that indicates whether a connection to the supplicant daemon has been gained or lost. true means a connection now exists. Retrieve it with getBooleanExtra(String, boolean).

常量值： "connected"

public static final String EXTRA_SUPPLICANT_ERROR

引入自： API 级别1

The lookup key for a SupplicantState describing the supplicant error code if any Retrieve with getIntExtra(String, int).

参见

• ERROR_AUTHENTICATING

常量值： "supplicantError"

public static final String EXTRA_WIFI_STATE

引入自： API 级别1

The lookup key for an int that indicates whether Wi-Fi is enabled, disabled, enabling, disabling, or unknown. Retrieve it with getIntExtra(String, int).

参见

• WIFI_STATE_DISABLED
• WIFI_STATE_DISABLING
• WIFI_STATE_ENABLED
• WIFI_STATE_ENABLING
• WIFI_STATE_UNKNOWN

常量值： "wifi_state"

public static final String NETWORK_IDS_CHANGED_ACTION

引入自： API 级别1

The network IDs of the configured networks could have changed.

常量值： "android.net.wifi.NETWORK_IDS_CHANGED"

public static final String NETWORK_STATE_CHANGED_ACTION

引入自： API 级别1

Broadcast intent action indicating that the state of Wi-Fi connectivity has changed. One extra provides the new state in the form of a NetworkInfo object. If the new state is CONNECTED, a second extra may provide the BSSID of the access point, as a String.

参见

• EXTRA_NETWORK_INFO
• EXTRA_BSSID

常量值： "android.net.wifi.STATE_CHANGE"

public static final String RSSI_CHANGED_ACTION

引入自： API 级别1

The RSSI (signal strength) has changed.

参见

• EXTRA_NEW_RSSI

常量值： "android.net.wifi.RSSI_CHANGED"

public static final String SCAN_RESULTS_AVAILABLE_ACTION

引入自： API 级别1

An access point scan has completed, and results are available from the supplicant. Call getScanResults() to obtain the results.

常量值： "android.net.wifi.SCAN_RESULTS"

public static final String SUPPLICANT_CONNECTION_CHANGE_ACTION

引入自： API 级别1

Broadcast intent action indicating that a connection to the supplicant has been established (and it is now possible to perform Wi-Fi operations) or the connection to the supplicant has been lost. One extra provides the connection state as a boolean, where true means CONNECTED.

参见

• EXTRA_SUPPLICANT_CONNECTED

常量值： "android.net.wifi.supplicant.CONNECTION_CHANGE"

public static final String SUPPLICANT_STATE_CHANGED_ACTION

引入自： API 级别1

Broadcast intent action indicating that the state of establishing a connection to an access point has changed.One extra provides the new SupplicantState. Note that the supplicant state is Wi-Fi specific, and is not generally the most useful thing to look at if you are just interested in the overall state of connectivity.

参见

• EXTRA_NEW_STATE
• EXTRA_SUPPLICANT_ERROR

常量值： "android.net.wifi.supplicant.STATE_CHANGE"

public static final int WIFI_MODE_FULL

引入自： API 级别3

In this Wi-Fi lock mode, Wi-Fi will be kept active, and will behave normally, i.e., it will attempt to automatically establish a connection to a remembered access point that is within range, and will do periodic scans if there are remembered access points but none are in range.

常量值： 1 (0x00000001)

public static final int WIFI_MODE_SCAN_ONLY

引入自： API 级别3

In this Wi-Fi lock mode, Wi-Fi will be kept active, but the only operation that will be supported is initiation of scans, and the subsequent reporting of scan results. No attempts will be made to automatically connect to remembered access points, nor will periodic scans be automatically performed looking for remembered access points. Scans must be explicitly requested by an application in this mode.

常量值： 2 (0x00000002)

public static final String WIFI_STATE_CHANGED_ACTION

引入自： API 级别1

Broadcast intent action indicating that Wi-Fi has been enabled, disabled, enabling, disabling, or unknown. One extra provides this state as an int. Another extra provides the previous state, if available.

参见

• EXTRA_WIFI_STATE
• EXTRA_PREVIOUS_WIFI_STATE

常量值： "android.net.wifi.WIFI_STATE_CHANGED"

public static final int WIFI_STATE_DISABLED

引入自： API 级别1

Wi-Fi is disabled.

参见

• WIFI_STATE_CHANGED_ACTION
• getWifiState()

常量值： 1 (0x00000001)

public static final int WIFI_STATE_DISABLING

引入自： API 级别1

Wi-Fi is currently being disabled. The state will change to WIFI_STATE_DISABLED if it finishes successfully.

参见

• WIFI_STATE_CHANGED_ACTION
• getWifiState()

常量值： 0 (0x00000000)

public static final int WIFI_STATE_ENABLED

引入自： API 级别1

Wi-Fi is enabled.

参见

• WIFI_STATE_CHANGED_ACTION
• getWifiState()

常量值： 3 (0x00000003)

public static final int WIFI_STATE_ENABLING

引入自： API 级别1

Wi-Fi is currently being enabled. The state will change to WIFI_STATE_ENABLED if it finishes successfully.

参见

• WIFI_STATE_CHANGED_ACTION
• getWifiState()

常量值： 2 (0x00000002)

public static final int WIFI_STATE_UNKNOWN

引入自： API 级别1

Wi-Fi is in an unknown state. This state will occur when an error happens while enabling or disabling.

参见

• WIFI_STATE_CHANGED_ACTION
• getWifiState()

常量值： 4 (0x00000004)

公有方法

public int addNetwork (WifiConfiguration config)

引入自： API 级别1

Add a new network description to the set of configured networks. The networkId field of the supplied configuration object is ignored.

The new network will be marked DISABLED by default. To enable it, called enableNetwork(int, boolean).

参数

config	the set of variables that describe the configuration, contained in a WifiConfiguration object.

返回值

• the ID of the newly created network description. This is used in other operations to specified the network to be acted upon. Returns -1 on failure.

public static int calculateSignalLevel (int rssi, int numLevels)

引入自： API 级别1

Calculates the level of the signal. This should be used any time a signal is being shown.

参数

rssi	The power of the signal measured in RSSI.
numLevels	The number of levels to consider in the calculated level.

返回值

• A level of the signal, given in the range of 0 to numLevels-1 (both inclusive).

public static int compareSignalLevel (int rssiA, int rssiB)

引入自： API 级别1

Compares two signal strengths.

参数

rssiA	The power of the first signal measured in RSSI.
rssiB	The power of the second signal measured in RSSI.

返回值

• Returns <0 if the first signal is weaker than the second signal, 0 if the two signals have the same strength, and >0 if the first signal is stronger than the second signal.

public WifiManager.MulticastLock createMulticastLock (String tag)

引入自： API 级别4

Create a new MulticastLock

参数

tag	a tag for the MulticastLock to identify it in debugging messages. This string is never shown to the user under normal conditions, but should be descriptive enough to identify your application and the specific MulticastLock within it, if it holds multiple MulticastLocks.

返回值

• a new, unacquired MulticastLock with the given tag.

参见

• WifiManager.MulticastLock

public WifiManager.WifiLock createWifiLock (int lockType, String tag)

引入自： API 级别3

Creates a new WifiLock.

参数

lockType	the type of lock to create. See WIFI_MODE_FULL, and WIFI_MODE_SCAN_ONLY for descriptions of the types of Wi-Fi locks.
tag	a tag for the WifiLock to identify it in debugging messages. This string is never shown to the user under normal conditions, but should be descriptive enough to identify your application and the specific WifiLock within it, if it holds multiple WifiLocks.

返回值

• a new, unacquired WifiLock with the given tag.

参见

• WifiManager.WifiLock

public WifiManager.WifiLock createWifiLock (String tag)

引入自： API 级别1

Creates a new WifiLock.

参数

tag	a tag for the WifiLock to identify it in debugging messages. This string is never shown to the user under normal conditions, but should be descriptive enough to identify your application and the specific WifiLock within it, if it holds multiple WifiLocks.

返回值

• a new, unacquired WifiLock with the given tag.

参见

• WifiManager.WifiLock

public boolean disableNetwork (int netId)

引入自： API 级别1

Disable a configured network. The specified network will not be a candidate for associating. This may result in the asynchronous delivery of state change events.

参数

netId	the ID of the network as returned by addNetwork(WifiConfiguration).

返回值

• true if the operation succeeded

public boolean disconnect ()

引入自： API 级别1

Disassociate from the currently active access point. This may result in the asynchronous delivery of state change events.

返回值

• true if the operation succeeded

public boolean enableNetwork (int netId, boolean disableOthers)

引入自： API 级别1

Allow a previously configured network to be associated with. If disableOthers is true, then all other configured networks are disabled, and an attempt to connect to the selected network is initiated. This may result in the asynchronous delivery of state change events.

参数

netId	the ID of the network in the list of configured networks
disableOthers	if true, disable all other networks. The way to select a particular network to connect to is specify true for this parameter.

返回值

• true if the operation succeeded

public List getConfiguredNetworks ()

引入自： API 级别1

Return a list of all the networks configured in the supplicant. Not all fields of WifiConfiguration are returned. Only the following fields are filled in:

• networkId
• SSID
• BSSID
• priority
• allowedProtocols
• allowedKeyManagement
• allowedAuthAlgorithms
• allowedPairwiseCiphers
• allowedGroupCiphers

返回值

• a list of network configurations in the form of a list of WifiConfiguration objects.

public WifiInfo getConnectionInfo ()

引入自： API 级别1

Return dynamic information about the current Wi-Fi connection, if any is active.

返回值

• the Wi-Fi information, contained in WifiInfo.

public DhcpInfo getDhcpInfo ()

引入自： API 级别1

Return the DHCP-assigned addresses from the last successful DHCP request, if any.

返回值

• the DHCP information

public List getScanResults ()

引入自： API 级别1

Return the results of the latest access point scan.

返回值

• the list of access points found in the most recent scan.

public int getWifiState ()

引入自： API 级别1

Gets the Wi-Fi enabled state.

返回值

• One of WIFI_STATE_DISABLED, WIFI_STATE_DISABLING, WIFI_STATE_ENABLED, WIFI_STATE_ENABLING, WIFI_STATE_UNKNOWN

参见

• isWifiEnabled()

public boolean isWifiEnabled ()

引入自： API 级别1

Return whether Wi-Fi is enabled or disabled.

返回值

• true if Wi-Fi is enabled

参见

• getWifiState()

public boolean pingSupplicant ()

引入自： API 级别1

Check that the supplicant daemon is responding to requests.

返回值

• true if we were able to communicate with the supplicant and it returned the expected response to the PING message.

public boolean reassociate ()

引入自： API 级别1

Reconnect to the currently active access point, even if we are already connected. This may result in the asynchronous delivery of state change events.

返回值

• true if the operation succeeded

public boolean reconnect ()

引入自： API 级别1

Reconnect to the currently active access point, if we are currently disconnected. This may result in the asynchronous delivery of state change events.

返回值

• true if the operation succeeded

public boolean removeNetwork (int netId)

引入自： API 级别1

Remove the specified network from the list of configured networks. This may result in the asynchronous delivery of state change events.

参数

netId	the integer that identifies the network configuration to the supplicant

返回值

• true if the operation succeeded

public boolean saveConfiguration ()

引入自： API 级别1

Tell the supplicant to persist the current list of configured networks.

Note: It is possible for this method to change the network IDs of existing networks. You should assume the network IDs can be different after calling this method.

返回值

• true if the operation succeeded

public boolean setWifiEnabled (boolean enabled)

引入自： API 级别1

Enable or disable Wi-Fi.

参数

enabled	true to enable, false to disable.

返回值

• true if the operation succeeds (or if the existing state is the same as the requested state).

public boolean startScan ()

引入自： API 级别1

Request a scan for access points. Returns immediately. The availability of the results is made known later by means of an asynchronous event sent on completion of the scan.

返回值

• true if the operation succeeded, i.e., the scan was initiated

public int updateNetwork (WifiConfiguration config)

引入自： API 级别1

Update the network description of an existing configured network.

参数

config	the set of variables that describe the configuration, contained in a WifiConfiguration object. It may be sparse, so that only the items that are being changed are non-null. The networkId field must be set to the ID of the existing network being updated.

返回值

• Returns the networkId of the supplied WifiConfiguration on success. 
  Returns -1 on failure, including when the networkId field of the WifiConfiguration does not refer to an existing network.