编程执行shell命令：为什么它不工作？

问题描述

我试图以编程方式执行新指令ScreenRecorder奇巧。我只是尝试这样的：

I'm trying to programmatically execute the new command "ScreenRecorder" kitkat. I just tried this:

suProcess = Runtime.getRuntime().exec("su");
process = Runtime.getRuntime().exec("screenrecord /sdcard/Folder/Example.mp4");

但不起作用。在文件夹我已经在文件 Example.mp4 ，但它是空的（0字节）。为什么？我怎样才能解决这个问题？哪里有问题？如果从终端模拟器我写苏和preSS进入并写在 screenrecord /sdcard/Folder/Example.mp4它完美。 Obvisioully我上运行4.4.2，并在根植终端。

But doesn't work. In the Folder I've the file Example.mp4 but it is empty (0 byte). Why? How can I solve this? Where is the problem? If from terminal emulator I write su and press enter and after write screenrecord /sdcard/Folder/Example.mp4 it works perfectly. Obvisioully I'm running on 4.4.2 and in a rooted terminal.

推荐答案

试试这个

public static void ScreenRecord() throws Exception
    {
        try
        {
            Process su = Runtime.getRuntime().exec("su");
            DataOutputStream outputStream = new DataOutputStream(su.getOutputStream());

            outputStream.writeBytes("screenrecord --time-limit 10 /sdcard/MyVideo.mp4\n");
            outputStream.flush();

            outputStream.writeBytes("exit\n");
            outputStream.flush();
            su.waitFor();
        }
        catch(IOException e)
        {
            throw new Exception(e);
        }catch(InterruptedException e){
            throw new Exception(e);
        }
    }

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