Android机顶盒判断网线拔插状态

​
//在java代码中执行adb命令
    public String execCommand(String command) {
        Runtime runtime;
        Process proc = null;
        StringBuffer stringBuffer = null;
        try {
            runtime = Runtime.getRuntime();
            proc = runtime.exec(command);
            stringBuffer = new StringBuffer();
            if (proc.waitFor() != 0) {
                System.err.println("exit value = " + proc.exitValue());
            }
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    proc.getInputStream()));

            String line = null;
            while ((line = in.readLine()) != null) {
                stringBuffer.append(line + " ");
            }

        } catch (Exception e) {
            System.err.println(e);
        } finally {
            try {
                proc.destroy();
            } catch (Exception e2) {
            }
        }
        return stringBuffer.toString();
    }
    //判断网线拔插状态
    //通过命令cat /sys/class/net/eth0/carrier，如果插有网线的话，读取到的值是1，否则为0
    public boolean isWirePluggedIn(){
        String state= execCommand("cat /sys/class/net/eth0/carrier");
        if(state.trim().equals("1")){  //有网线插入时返回1，拔出时返回0
            return true;
        }
        return false;
    }
​