For example:Īs shown, the emulator instance connected to adb on port 5555 is the same as the instance whose console listens on port 5554. Note that each emulator/device instance acquires a pair of sequential ports - an even-numbered port for console connections and an odd-numbered port for adb connections.

Where the server finds an adb daemon, it sets up a connection to that port. It locates emulator/device instances by scanning odd-numbered ports in the range 5555 to 5585, the range used by emulators/devices. The server then sets up connections to all running emulator/device instances. When the server starts, it binds to local TCP port 5037 and listens for commands sent from adb clients-all adb clients use port 5037 to communicate with the adb server. If there isn't, it starts the server process. When you start an adb client, the client first checks whether there is an adb server process already running. The server manages communication between the client and the adb daemon running on an emulator or device.Ī daemon, which runs as a background process on each emulator or device instance. Other Android tools such as the ADT plugin and DDMS also create adb clients.Ī server, which runs as a background process on your development machine. You can invoke a client from a shell by issuing an adb command. It is a client-server program that includes three components:Ī client, which runs on your development machine. From the Android website -Īndroid Debug Bridge (adb) is a versatile tool lets you manage the state of an emulator instance or Android-powered device. The program is a modification of the original tool adb (Android Developers Bridge) developed by the Android team and made open source with the rest of the Android system.

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