非静态方法getDeviceList()无法从静态上下文中引用。

huangapple
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英文:

non-static method getDeviceList() cannot be referenced from a static context

问题

  1. 当运行脚本时，我收到错误消息："非静态方法 getDeviceList() 无法从静态上下文引用" - 如何将此方法改为静态？
  3. private static String getUsbDeviceAddress(String selection) {
  4.     String address = selection;
  6.     if (android.os.Build.VERSION.SDK_INT > 21) {
  8.         HashMap<String, UsbDevice> deviceList = UsbManager.getDeviceList();
  10.         for (UsbDevice device : deviceList.values()) {
  11.             if (device != null) {
  12.                 String dsn = device.getSerialNumber();
  14.                 if ((dsn != null) && !dsn.isEmpty()) {
  15.                     if (selection.equalsIgnoreCase(dsn)) {
  16.                         address = device.getDeviceName();
  17.                         break;
  18.                     }
  19.                 }
  20.             }
  21.         }
  22.     }
  24.     return address;
  25. }
英文:

When running script I receive the error "non-static method getDeviceList() cannot be referenced from a static context" - How do I make this method static?

  1. private static String getUsbDeviceAddress(String selection) {
  2.         String address = selection;
  4.         if (android.os.Build.VERSION.SDK_INT &gt; 21) {
  6.                 HashMap&lt;String, UsbDevice&gt; deviceList = UsbManager.getDeviceList();
  8.                 for (UsbDevice device : deviceList.values()) {
  9.                     if (device != null) {
  10.                         String dsn = device.getSerialNumber();
  12.                         if ((dsn != null) &amp;&amp; !dsn.isEmpty()) {
  13.                             if (selection.equalsIgnoreCase(dsn)) {
  14.                                 address = device.getDeviceName();
  15.                                 break;
  16.                             }
  17.                         }
  18.                     }
  19.                 }
  20.         }
  22.         return address;
  23.     }

答案1

得分: 0

getDeviceList() 方法不是静态的。您需要像这样声明：

  1. public static HashMap<String, UsbDevice> getDeviceList(){}
英文:

getDeviceList() method not static.You need to declare like

  1.    public static HashMap&lt;String, UsbDevice&gt;  getDeviceList(){}

huangapple
  • 本文由 发表于 2020年3月16日 10:15:42
  • 转载请务必保留本文链接：https://java.coder-hub.com/60699565.html
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