在Android活动中尝试执行简单命令时出错

<uses-permission android:name="android.permission.INTERNET" />

import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;

import androidx.appcompat.app.AppCompatActivity;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        executeCommand("ls -l");
    }

    private void executeCommand(String command) {
        new AsyncTask<String, Void, String>() {
            @Override
            protected String doInBackground(String... commands) {
                try {
                    Process process = Runtime.getRuntime().exec(commands[0]);
                    BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
                    StringBuilder output = new StringBuilder();
                    String line;
                    while ((line = reader.readLine()) != null) {
                        output.append(line).append("\n");
                    }
                    reader.close();
                    return output.toString();
                } catch (IOException e) {
                    Log.e(TAG, "Command execution failed", e);
                    return null;
                }
            }

            @Override
            protected void onPostExecute(String result) {
                if (result != null) {
                    Log.d(TAG, "Command executed successfully: " + result);
                } else {
                    Log.e(TAG, "Command execution failed");
                }
            }
        }.execute(command);
    }
}