Question

晚上好，所以我正在使用Android Studio开发应用程序，并且想从Raspberry检索终端输出，所以我正在使用JSch进行ssh连接。但是，由于我的树莓派任务是周期性的（以1 Hz的频率），因此我希望在树莓派输出后立即检索终端线。换句话说，我需要在Android函数仍在运行时显示输出以检索以下行。

目前，以下代码仅显示终端输出的第一行，并且出于某种晦涩的原因（对我而言），不显示以下几行！希望你能帮助我。

以下是我的代码，无法正常运行：

按下发送按钮时，我正在调用“ RetrieveFeedTask”异步任务：

send_button.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if(event.getAction() == MotionEvent.ACTION_DOWN) {
            String command = “./SomeProgrammeToExecute”;
            String command_type = "send";

     new RetrieveFeedTask().execute(command, command_type);
            command_edit_text.setText("");

        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            //Something else
        }
        return true;
    }
});

}

异步任务如下：

class RetrieveFeedTask extends AsyncTask<String, Void, String> {

private Exception exception;

protected String doInBackground(String... params) {
    try {
        String hostname = "192.168.0.14";
        String username = "root";
        String password = "pi";
        String result = runCommand(hostname, username, password, params[0], params[1]);

        return result;

    } catch (Exception e) {
        this.exception = e;
        return e.toString();
    }
}

}

并且此类调用一个'runCommand'函数，该函数返回输出String，以及使用输出String设置TextView：

public String runCommand(String hostname, String username, String password, String command, String command_type)
    throws JSchException, IOException {

jSch = new JSch();
int port = 22;

session = jSch.getSession(username, hostname, port);
session.setPassword(password);
session.setConfig("StrictHostKeyChecking", "no");
session.connect(30000);
channel = (ChannelExec) session.openChannel("exec");
channel.setPty(true);

channel.setCommand(command);

in = new BufferedReader(new InputStreamReader(channel.getInputStream(), "utf8"));
out = channel.getOutputStream();

channel.connect();

String result_output = "";

if(command_type == "send"){
    String line = null;
    String current_terminal = "";
    while(true) {
        line = in.readLine();
        if(line != null){
            current_terminal = terminal_textView.getText().toString();
            result_output = current_terminal + "\n" + result_output + "\n" + line;
            terminal_textView.setText(result_output);
        }else{
            if(channel.isClosed()){
                current_terminal = terminal_textView.getText().toString();
                result_output = current_terminal + "\n" + result_output + "\n" + channel.getExitStatus();
                terminal_textView.setText(result_output);
                break;
            }else{
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    current_terminal = terminal_textView.getText().toString();
                    result_output = current_terminal + "\n" + result_output + "\n" + e.toString();
                    terminal_textView.setText(result_output);
                }
            }
        }
    }
}

channel.disconnect();
session.disconnect();

return result_output;

}

Android Studio-JSch：在功能仍在运行时获取终端线路

0 个答案: