用代码实现断开Android手机USB连接

用代码实现断开Android手机USB连接

       

        用代码 实现了一个小功能：断开android手机USB连接。

        

	// 尝试断开USB连接
	boolean disconnectUSB() {
		String state = "none";// 禁用所有usb
		//String state = "adb";// 仅使用adb
		//String state = "mtp,adb";// 使用mtp与adb
		SystemProperties.set("sys.usb.config", state);
		// wait for the transition to complete.
		// give up after 1 second.
		for (int i = 0; i < 20; i++) {
			// State transition is done when sys.usb.state is set to the new configuration
			if (state.equals(SystemProperties.get("sys.usb.state"))) return true;
			SystemClock.sleep(50);
		}
		return false;
	}

        也可通过反射机制进行调用，但其实最终实际执行的还是上面的代码。

		try {
			final int MSG_SET_CURRENT_FUNCTIONS = 2;
			IBinder usb_service = ServiceManager.getService(Context.USB_SERVICE);
			
			Class c_UsbService = Helpers.findClass("com.android.server.usb.UsbService");
			Field f_mDeviceManager = Helpers.findField(c_UsbService, "mDeviceManager");
			Object o_mDeviceManager = f_mDeviceManager.get(usb_service);
			
			Class c_UsbDeviceManager = Helpers.findClass("com.android.server.usb.UsbDeviceManager");
			Field f_mHandler = Helpers.findField(c_UsbDeviceManager, "mHandler");
			Object o_mHandler = f_mHandler.get(o_mDeviceManager);
			Handler h_mHandler = (Handler) o_mHandler;

			// 禁用adb
			Field f_mAdbEnabled = Helpers.findField(c_UsbDeviceManager, "mAdbEnabled");
			f_mAdbEnabled.setBoolean(o_mDeviceManager, false);
			
			// 不提供USB服务
			Message msg = Message.obtain(h_mHandler, MSG_SET_CURRENT_FUNCTIONS);
			msg.obj = new String("none");
			msg.arg1 = 0;
			h_mHandler.removeMessages(MSG_SET_CURRENT_FUNCTIONS);
			h_mHandler.sendMessage(msg);
			
			Log.d("test", "[End]try disconnect USB");
			return true;
		} catch (Throwable e) {
			e.printStackTrace();
			Log.e("test", "[disconnectUSB][Throwable]" + e.getMessage());
		}
		return false;