Android6.0 Android7.0系统获getMacAddress（）取Wifi和蓝牙Mac地址返回02:00:00:00:00:00解决办法
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有一些比较老的app。在使用的过程中会出现 getmac 返回： 02:00:00:00 这样的一个值。导致这些app无法使用。在这些app没有更新的情况下。可以通过修改framework满足一些客户的定制app的使用
造成这个问题的根本原因在于 6.0 以后的android 系统 getMacAddress(); 这个api已经失效。如果是自己写应用。只需要更新api。换成6.0 以后支持的方法去获取就可以获取到mac地址。当然。我们这里讨论的是另外一种方式。客户提供较老的app给你，而这个app并没有源码的情况下。可以通过修改系统的framework来解决这个问题。
先看看wifiinfo这个类: 不想看直接跳到源码最后一行。
public class WifiInfo implements Parcelable { private static final String TAG = "WifiInfo"; /** * This is the map described in the Javadoc comment above. The positions * of the elements of the array must correspond to the ordinal values * of <code>DetailedState</code>. */ private static final EnumMap<SupplicantState, DetailedState> stateMap = new EnumMap<SupplicantState, DetailedState>(SupplicantState.class); /** * Default MAC address reported to a client that does not have the * android.permission.LOCAL_MAC_ADDRESS permission. * * @hide */ public static final String DEFAULT_MAC_ADDRESS = "02:00:00:00:00:00"; static { stateMap.put(SupplicantState.DISCONNECTED, DetailedState.DISCONNECTED); stateMap.put(SupplicantState.INTERFACE_DISABLED, DetailedState.DISCONNECTED); stateMap.put(SupplicantState.INACTIVE, DetailedState.IDLE); stateMap.put(SupplicantState.SCANNING, DetailedState.SCANNING); stateMap.put(SupplicantState.AUTHENTICATING, DetailedState.CONNECTING); stateMap.put(SupplicantState.ASSOCIATING, DetailedState.CONNECTING); stateMap.put(SupplicantState.ASSOCIATED, DetailedState.CONNECTING); stateMap.put(SupplicantState.FOUR_WAY_HANDSHAKE, DetailedState.AUTHENTICATING); stateMap.put(SupplicantState.GROUP_HANDSHAKE, DetailedState.AUTHENTICATING); stateMap.put(SupplicantState.COMPLETED, DetailedState.OBTAINING_IPADDR); stateMap.put(SupplicantState.DORMANT, DetailedState.DISCONNECTED); stateMap.put(SupplicantState.UNINITIALIZED, DetailedState.IDLE); stateMap.put(SupplicantState.INVALID, DetailedState.FAILED); } private SupplicantState mSupplicantState; private String mBSSID; private WifiSsid mWifiSsid; private int mNetworkId; /** @hide **/ public static final int INVALID_RSSI = -127; /** @hide **/ public static final int MIN_RSSI = -126; /** @hide **/ public static final int MAX_RSSI = 200; /** * Received Signal Strength Indicator */ private int mRssi; /** * Link speed in Mbps */ public static final String LINK_SPEED_UNITS = "Mbps"; private int mLinkSpeed; /** * Frequency in MHz */ public static final String FREQUENCY_UNITS = "MHz"; private int mFrequency; private InetAddress mIpAddress; private String mMacAddress = DEFAULT_MAC_ADDRESS; private boolean mEphemeral; /** * @hide */ public long txBad; /** * @hide */ public long txRetries; /** * @hide */ public long txSuccess; /** * @hide */ public long rxSuccess; /** * @hide */ public double txBadRate; /** * @hide */ public double txRetriesRate; /** * @hide */ public double txSuccessRate; /** * @hide */ public double rxSuccessRate; /** * @hide */ public int badRssiCount; /** * @hide */ public int linkStuckCount; /** * @hide */ public int lowRssiCount; /** * @hide */ public int score; /** * TODO: get actual timestamp and calculate true rates * @hide */ public void updatePacketRates(WifiLinkLayerStats stats) { if (stats != null) { long txgood = stats.txmpdu_be + stats.txmpdu_bk + stats.txmpdu_vi + stats.txmpdu_vo; long txretries = stats.retries_be + stats.retries_bk + stats.retries_vi + stats.retries_vo; long rxgood = stats.rxmpdu_be + stats.rxmpdu_bk + stats.rxmpdu_vi + stats.rxmpdu_vo; long txbad = stats.lostmpdu_be + stats.lostmpdu_bk + stats.lostmpdu_vi + stats.lostmpdu_vo; if (txBad <= txbad && txSuccess <= txgood && rxSuccess <= rxgood && txRetries <= txretries) { txBadRate = (txBadRate * 0.5) + ((double) (txbad - txBad) * 0.5); txSuccessRate = (txSuccessRate * 0.5) + ((double) (txgood - txSuccess) * 0.5); rxSuccessRate = (rxSuccessRate * 0.5) + ((double) (rxgood - rxSuccess) * 0.5); txRetriesRate = (txRetriesRate * 0.5) + ((double) (txretries - txRetries) * 0.5); } else { txBadRate = 0; txSuccessRate = 0; rxSuccessRate = 0; txRetriesRate = 0; } txBad = txbad; txSuccess = txgood; rxSuccess = rxgood; txRetries = txretries; } else { txBad = 0; txSuccess = 0; rxSuccess = 0; txRetries = 0; txBadRate = 0; txSuccessRate = 0; rxSuccessRate = 0; txRetriesRate = 0; } } /** * This function is less powerful and used if the WifiLinkLayerStats API is not implemented * at the Wifi HAL * @hide */ public void updatePacketRates(long txPackets, long rxPackets) { //paranoia txBad = 0; txRetries = 0; txBadRate = 0; txRetriesRate = 0; if (txSuccess <= txPackets && rxSuccess <= rxPackets) { txSuccessRate = (txSuccessRate * 0.5) + ((double) (txPackets - txSuccess) * 0.5); rxSuccessRate = (rxSuccessRate * 0.5) + ((double) (rxPackets - rxSuccess) * 0.5); } else { txBadRate = 0; txRetriesRate = 0; } txSuccess = txPackets; rxSuccess = rxPackets; } /** * Flag indicating that AP has hinted that upstream connection is metered, * and sensitive to heavy data transfers. */ private boolean mMeteredHint; /** @hide */ public WifiInfo() { mWifiSsid = null; mBSSID = null; mNetworkId = -1; mSupplicantState = SupplicantState.UNINITIALIZED; mRssi = INVALID_RSSI; mLinkSpeed = -1; mFrequency = -1; } /** @hide */ public void reset() { setInetAddress(null); setBSSID(null); setSSID(null); setNetworkId(-1); setRssi(INVALID_RSSI); setLinkSpeed(-1); setFrequency(-1); setMeteredHint(false); setEphemeral(false); txBad = 0; txSuccess = 0; rxSuccess = 0; txRetries = 0; txBadRate = 0; txSuccessRate = 0; rxSuccessRate = 0; txRetriesRate = 0; lowRssiCount = 0; badRssiCount = 0; linkStuckCount = 0; score = 0; } /** * Copy constructor * @hide */ public WifiInfo(WifiInfo source) { if (source != null) { mSupplicantState = source.mSupplicantState; mBSSID = source.mBSSID; mWifiSsid = source.mWifiSsid; mNetworkId = source.mNetworkId; mRssi = source.mRssi; mLinkSpeed = source.mLinkSpeed; mFrequency = source.mFrequency; mIpAddress = source.mIpAddress; mMacAddress = source.mMacAddress; mMeteredHint = source.mMeteredHint; mEphemeral = source.mEphemeral; txBad = source.txBad; txRetries = source.txRetries; txSuccess = source.txSuccess; rxSuccess = source.rxSuccess; txBadRate = source.txBadRate; txRetriesRate = source.txRetriesRate; txSuccessRate = source.txSuccessRate; rxSuccessRate = source.rxSuccessRate; score = source.score; badRssiCount = source.badRssiCount; lowRssiCount = source.lowRssiCount; linkStuckCount = source.linkStuckCount; } } /** @hide */ public void setSSID(WifiSsid wifiSsid) { mWifiSsid = wifiSsid; } /** * Returns the service set identifier (SSID) of the current 802.11 network. * If the SSID can be decoded as UTF-8, it will be returned surrounded by double * quotation marks. Otherwise, it is returned as a string of hex digits. The * SSID may be <unknown ssid> if there is no network currently connected. * @return the SSID */ public String getSSID() { if (mWifiSsid != null) { String unicode = mWifiSsid.toString(); if (!TextUtils.isEmpty(unicode)) { return "\"" + unicode + "\""; } else { return mWifiSsid.getHexString(); } } return WifiSsid.NONE; } /** @hide */ public WifiSsid getWifiSsid() { return mWifiSsid; } /** @hide */ public void setBSSID(String BSSID) { mBSSID = BSSID; } /** * Return the basic service set identifier (BSSID) of the current access point. * The BSSID may be {@code null} if there is no network currently connected. * @return the BSSID, in the form of a six-byte MAC address: {@code XX:XX:XX:XX:XX:XX} */ public String getBSSID() { return mBSSID; } /** * Returns the received signal strength indicator of the current 802.11 * network, in dBm. * * <p>Use {@link android.net.wifi.WifiManager#calculateSignalLevel} to convert this number into * an absolute signal level which can be displayed to a user. * * @return the RSSI. */ public int getRssi() { return mRssi; } /** @hide */ public void setRssi(int rssi) { if (rssi < INVALID_RSSI) rssi = INVALID_RSSI; if (rssi > MAX_RSSI) rssi = MAX_RSSI; mRssi = rssi; } /** * Returns the current link speed in {@link #LINK_SPEED_UNITS}. * @return the link speed. * @see #LINK_SPEED_UNITS */ public int getLinkSpeed() { return mLinkSpeed; } /** @hide */ public void setLinkSpeed(int linkSpeed) { this.mLinkSpeed = linkSpeed; } /** * Returns the current frequency in {@link #FREQUENCY_UNITS}. * @return the frequency. * @see #FREQUENCY_UNITS */ public int getFrequency() { return mFrequency; } /** @hide */ public void setFrequency(int frequency) { this.mFrequency = frequency; } /** * @hide * TODO: makes real freq boundaries */ public boolean is24GHz() { return ScanResult.is24GHz(mFrequency); } /** * @hide * TODO: makes real freq boundaries */ public boolean is5GHz() { return ScanResult.is5GHz(mFrequency); } /** * Record the MAC address of the WLAN interface * @param macAddress the MAC address in {@code XX:XX:XX:XX:XX:XX} form * @hide */ public void setMacAddress(String macAddress) { this.mMacAddress = macAddress; } public String getMacAddress() { return mMacAddress; }最后的这个String getMacAddress();这个方法 他返回了一个mMacAddress . 这个mMacAdress 在类的开头直接赋值
public static final String DEFAULT_MAC_ADDRESS = "02:00:00:00:00:00"; private String mMacAddress = DEFAULT_MAC_ADDRESS;所以他返回了的是一个 02:00:00 这样的一个值。如果我们只需要在这个地方做一些修改。把他真正的mac地址返回去就可以了：
//add by vincent qq:514505874public String getMacAddress() { if(mMacAddress.equals(DEFAULT_MAC_ADDRESS)){ return getWireMacAddr(); }else{ return mMacAddress; } }getWriteMacAddr() 这个方法里面实现的就是把获取到的mac地址反馈回去。 实现的方法有很多种
例如直接通过CMD命令行获取mac地址：
private static final String ETH0_MAC_ADDR = "/sys/class/net/wlan0/address" ; BufferedReader reader = new BufferedReader(new FileReader(ETH0_MAC_ADDR), 256); try { return reader.readLine(); } finally { reader.close(); }当然方法不止有这种。目的都是一样，只要能把 getMacAddress 这个旧api 的return 给返回一个真正的mac地址就可以了欢迎沟通交流：QQ:514505874
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