android - 从 android Activity 执行 su 命令

Question

我正在尝试执行以下方法:

public void runAsRoot(String[] cmds) throws Exception {
        Process p = Runtime.getRuntime().exec("su");
        DataOutputStream os = new DataOutputStream(p.getOutputStream());
        InputStream is = p.getInputStream();
        for (String tmpCmd : cmds) {
            os.writeBytes(tmpCmd+"\n");
            int readed = 0;
            byte[] buff = new byte[4096];

            // if cmd requires an output
            // due to the blocking behaviour of read(...)
            boolean cmdRequiresAnOutput = true;
            if (cmdRequiresAnOutput) {
                while( is.available() <= 0) {
                    try { Thread.sleep(200); } catch(Exception ex) {}
                }

                while( is.available() > 0) {
                    readed = is.read(buff);
                    if ( readed <= 0 ) break;
                    String seg = new String(buff,0,readed);
                    Log.i("#>", seg);
                }
            }
        }        
        os.writeBytes("exit\n");
        os.flush();
    }

我使用以下输入调用了这个方法:

String[] cmds = {"/system/bin/sendevent /dev/input/event0 1 107 0 \n", "sleep 1", "/system/bin/sendevent /dev/input/event0 1 107 1 \n"};
                try {
                    runAsRoot(cmds);
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

但在 logcat 中我收到以下错误:

07-06 15:19:27.007: E/su(6547): sudb - Opening database
07-06 15:19:27.007: E/(6547): Couldn't open database: unable to open database file
07-06 15:19:27.017: E/su(6547): sudb - Could not open database, prompt user
07-06 15:19:47.082: E/su(6547): select failed with 2: No such file or directory
07-06 15:19:47.082: W/su(6547): request rejected (10060->0 /system/bin/sh)

知道问题出在哪里吗？

Answer 1

看起来 su 二进制文件有问题，而不是您的应用程序。检查您是否可以从“adb shell”成功运行 root shell。如果“adb shell”从一开始就给你一个 root shell，运行“su 1000”以失去 root 权限，然后运行“su”尝试再次进入 root shell。如果失败，则 su 不工作。

哦，还有一个相关的注意事项:一定要在另一个线程中运行 su，可能是通过 Handler 或 AsyncTask，这样它就不会阻塞您的 UI 线程。