不能從靜態上下文中引用非靜態方法 getDeviceList()

Question

運行腳本時，我收到錯誤“無法從靜態上下文中引用非靜態方法 getDeviceList()” - 如何使該方法成為靜態？

private static String getUsbDeviceAddress(String selection) {
        String address = selection;

        if (android.os.Build.VERSION.SDK_INT > 21) {

                HashMap<String, UsbDevice> deviceList = UsbManager.getDeviceList();

                for (UsbDevice device : deviceList.values()) {
                    if (device != null) {
                        String dsn = device.getSerialNumber();

                        if ((dsn != null) && !dsn.isEmpty()) {
                            if (selection.equalsIgnoreCase(dsn)) {
                                address = device.getDeviceName();
                                break;
                            }
                        }
                    }
                }
        }

        return address;
    }

Answer 1

getDeviceList() 方法不是靜態的。你需要聲明像

   public static HashMap<String, UsbDevice>  getDeviceList(){}