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 name
- if (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:
net.hostname=###
2. 重启, 重连 Wi-Fi, 从热点或路由器后台查看设备名即为修改后的名称.
来源: http://www.bubuko.com/infodetail-3257953.html