执行普通的su命令，条件是设备root，且允许应用执行su命令

// 公共函数：执行命令并获取输出
    private fun executeProcess(command: Array<String>): String {
        var process: Process? = null
        val output = StringBuilder()

        try {
            process = Runtime.getRuntime().exec(command)
            output.append(readProcessOutput(process))
        } catch (e: Exception) {
            output.append("Exception: ").append(e.message)
        } finally {
            process?.destroy()
        }

        return logAndReturn("execSuCommand", command.joinToString(" "), output.toString())
    }

比如可以通过 executeProces(listof(“su”,"0","id")）来测试是否有su执行权限

相当于执行

2. 另外一种执行，是交互式命令，在命令执行的输出流中再写命令，并执行等待结果

private fun execSu548Command(command: String): String {
        val output = StringBuilder()
        var process: Process? = null
        try {
            // 获取 su 权限
            process = Runtime.getRuntime().exec("su 548")
            val os = process.outputStream
            val dos = DataOutputStream(os)
            // 写入要执行的命令
            dos.writeBytes(command + "\n")
            dos.writeBytes("exit\n")
            dos.flush()
            // 读取标准输出
            val reader = BufferedReader(
                InputStreamReader(process.inputStream)
            )
            var line: String?
            while ((reader.readLine().also { line = it }) != null) {
                output.append(line).append("\n")
            }
            // 读取错误输出
            val errorReader = BufferedReader(
                InputStreamReader(process.errorStream)
            )
            while ((errorReader.readLine().also { line = it }) != null) {
                output.append(line).append("\n")
            }
            // 等待执行结束
            process.waitFor()
        } catch (e: java.lang.Exception) {
            output.append("Exception: ").append(e.message)
        } finally {
            if (process != null) {
                process.destroy()
            }
        }
        val result = output.toString().trim { it <= ' ' }
        LogUtils.d("$TAG execSuCommand $command,result $result")
        return result
    }

相当于