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Android：修改连接到路由器端显示的设备名

news 2026/5/11 21:19:07

一、Android系统代码中实现设备名分配

　　1. \frameworks\base\services\core\java\com\android\server\ConnectivityService.java

　　　建立连接时读取 "net.hostname" 属性值是否为空，如果为空则获取设备id，加上"android-"前缀并设置到属性：

protected ConnectivityService(Context context, INetworkManagementService netManager,INetworkStatsService statsService, INetworkPolicyManager policyManager,IpConnectivityLog logger) {mHandlerThread = new HandlerThread("ConnectivityServiceThread");mHandlerThread.start();mHandler = new InternalHandler(mHandlerThread.getLooper());mTrackerHandler = new NetworkStateTrackerHandler(mHandlerThread.getLooper());// setup our unique device nameif (TextUtils.isEmpty(SystemProperties.get("net.hostname"))) {String id = Settings.Secure.getString(context.getContentResolver(),Settings.Secure.ANDROID_ID);if (id != null && id.length() > 0) {String name = new String("android-").concat(id);SystemProperties.set("net.hostname", name);}}
　　　　　......
}

　　2. \frameworks\base\services\net\java\android\net\dhcp\DhcpInformPacket.java

　　　通过 addCommonClientTlvs() 接口获取设备ID并填入buffer:

    /*** Adds additional parameters to the INFORM packet.*/void finishPacket(ByteBuffer buffer) {addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_INFORM);addTlv(buffer, DHCP_CLIENT_IDENTIFIER, getClientId());addCommonClientTlvs(buffer);addTlv(buffer, DHCP_PARAMETER_LIST, mRequestedParams);addTlvEnd(buffer);}

　　调用到 \frameworks\base\services\net\java\android\net\dhcp\DhcpPacket.java 中获取 "net.hostname" 属性值，

　　添加到Tlv信息中（TLV是一种编码方式，由数据的类型Tag，数据的长度Length，数据的内容Value构成的一组数据报文）

    protected void addCommonClientTlvs(ByteBuffer buf) {addTlv(buf, DHCP_MAX_MESSAGE_SIZE, (short) MAX_LENGTH);Option60 option60 = null;if (mIface != null) {option60 = OptionManager.getInstance().getOption60(mIface);}if (option60 != null && option60.getOptionSwitch() != 0&& option60.getLogin() != null && option60.getPassword() != null){byte[] dhcpPlusBuf = buildDhcpPlusMsg(option60.getLogin(),option60.getPassword());addTlv(buf,DHCP_VENDOR_CLASS_ID,dhcpPlusBuf);} else {addTlv(buf, DHCP_VENDOR_CLASS_ID, getVendorId());}final String hn = getHostname();if (!TextUtils.isEmpty(hn)) addTlv(buf, DHCP_HOST_NAME, hn);}

　　getHostname() 实现：

    private String getHostname() {if (testOverrideHostname != null) return testOverrideHostname;return SystemProperties.get("net.hostname");}

　　 addTlv() 实现：

    /*** Adds an optional parameter containing an array of bytes.*/protected static void addTlv(ByteBuffer buf, byte type, byte[] payload) {if (payload != null) {if (payload.length > MAX_OPTION_LEN) {throw new IllegalArgumentException("DHCP option too long: "+ payload.length + " vs. " + MAX_OPTION_LEN);}buf.put(type);buf.put((byte) payload.length);buf.put(payload);}}

　　编译及更新：

mmm frameworks/base/services/
adb push out/target/product/almond/system/framework/services.jar /system/framework/
adb push out/target/product/almond/system/framework/oat/arm64/services.odex /system/framework/oat/arm64/   （优化编译才有此目录）

二、通过build.prop文件配置设备名

　　1. 修改 /system/build.prop 最后添加，### 为自己设置的设备名：