android写入节点的方法

import java.io.FileWriter;
import java.io.IOException;

private void writeFile(String path, String content) {
       FileWriter fileWriter = null;
       try {
           fileWriter = new FileWriter(path);
           if (fileWriter != null) {
               fileWriter.write(content);
           }
       } catch (Exception e) {
           e.printStackTrace();
           Log.e(TAG,"fail 1");
       } finally {
           if (fileWriter != null)
               try {
                   fileWriter.close();
                   Log.d(TAG,"scuess");
               } catch (IOException e) {
                   e.printStackTrace();
                   Log.e(TAG,"fail 2");
               }
       }
   }

   public void onClick(View v) {
       switch (v.getId()) {
       case R.id.btn_open_adb:
           String strKey = "/sys/kernel/usb_mode/usb_mode";
           String strValue = "device";
           writeFile(strKey, strValue);
           Toast.makeText(MainActivity.this, "打开adb成功", Toast.LENGTH_SHORT)
                   .show();
           break;
       case R.id.btn_open_usb:
           String strKey1 = "/sys/kernel/usb_mode/usb_mode";
           String strValue1 = "host ";
           writeFile(strKey1, strValue1);
           Toast.makeText(MainActivity.this, "打开usb成功", Toast.LENGTH_SHORT)
                   .show();
           break;

       default:
           break;
       }
   }

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