原理
通过 Socket 连接通信，将 PC 端作为客户端，Android 设备作为服务端
127.0.0.1 为设备本地地址
Android 与 PC 端通过端口通信，需要用到 forward 指令
adb forward tcp:8000 tcp:9000
将 PC 的8000端口的数据发送到 Android 设备9000端口
执行该指令之后才能通信
注意，该指令只能由 PC 端执行，故 Socket 方式不支持两台 Android 设备间通过 USB 通信
PC 端代码
public static void main(String[] args) {
try {
Socket socket = new Socket("127.0.0.1", 8000);
DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
dos.writeUTF("send from pc");
socket.close();
} catch (IOException ex) {
System.out.println(ex.getMessage());
}
}
Android 端代码
class AndroidServer extends Thread {
private boolean stop = false;
public void setStop(boolean stop) {
this.stop = stop;
}
@Override
public void run() {
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(9000);
while (!stop) {
Socket socket = serverSocket.accept();
DataInputStream inputStream = new DataInputStream(socket.getInputStream());
DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
final String msg = inputStream.readUTF();
Log.d(TAG, "msg: " + msg);
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, msg, Toast.LENGTH_LONG)
.show();
}
});
socket.close();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (serverSocket != null) {
try {
serverSocket.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}