Java Android-can'；t在模拟器中执行简单cd

我有一个仿真器，我根（虽然我不确定它是否正确） 相关的）

我正在尝试为我的论文构建一个根应用程序，当一个按钮 按下按钮，它将尝试查找数据库文件

我已经达到了尝试从中执行shell命令的程度 在应用程序中（java代码），但我所能做的就是

ls

当我尝试将

cd

放入另一个文件夹时，它不起作用。在

cd之后

我执行

pwd

或

ls

，它们仍然给出

/

的结果

下面是我代码的相关部分

Button btn_read = (Button) findViewById(R.id.button);
    btn_read.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            /*String s;

            try {
                Process p = Runtime.getRuntime().exec("ls -al");
                p = Runtime.getRuntime().exec("adb shell");
                p = Runtime.getRuntime().exec("cd data/data");

                BufferedReader stdInput = new BufferedReader(new
                        InputStreamReader(p.getInputStream()));

                BufferedReader stdError = new BufferedReader(new
                        InputStreamReader(p.getErrorStream()));

                // read the output from the command
                Log.d("ReadDB", "Here is the standard output of the command:\n");
                while ((s = stdInput.readLine()) != null) {
                    Log.d("ReadDB", s);
                }

                // read any errors from the attempted command
                Log.d("ReadDB", "Here is the standard error of the command (if any):\n");
                while ((s = stdError.readLine()) != null) {
                    Log.d("ReadDB", s);
                }

                System.exit(0);
            }
            catch (IOException e) {
                Log.d("ReadDB", "Exception happened - here's what I know: ");
                e.printStackTrace();
                System.exit(-1);
            }*/

            executeCommand(new String[] {
                "sh", "-c", "ls -l"
            });
            /*executeCommand(new String[] {
                "sh", "-c", "cd /mnt"
            });*/
            executeCommand(new String[] {
                "sh", "-c", "ls -l data/data"
            });
            executeCommand(new String[] {
                "sh", "-c", "pwd"
            });
        }
    });
}

private static void executeCommand(String[] commands) {
    Process p;
    try {
        p = Runtime.getRuntime().exec(commands);
        p.waitFor();
        BufferedReader reader =
                new BufferedReader(new InputStreamReader(p.getInputStream()));

        String line = "";
        while ((line = reader.readLine())!= null) {
            Log.d("ReadDB", line + "\n");
        }
        Log.d("ReadDB", "--------------------------------------------------------------------------------------");

    } catch (Exception e) {
        Log.d("ReadDB", "Exception occured");
        e.printStackTrace();
    }
}

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有人能帮忙吗？

这些命令将单独运行，因此这是不可能的。什么应该起作用：

---

谢谢它似乎起作用了

executeCommand(new String[] {
    "sh", "-c", "cd /mnt && some other command"
});