Android && 命令行程序

1. 在android 中执行相关Linux 程序 或者 获取相关命令行程序的pid，以下是相关简单的封装：

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import android.app.Activity;

public class SystemManager extends Activity {

    public static Process RootCommand(String command) {
        Process process = null;
        DataOutputStream os = null;

        try {
            process = Runtime.getRuntime().exec("su");
            os = new DataOutputStream(process.getOutputStream());
            os.writeBytes(command + "\n");
            os.writeBytes("exit\n");
            os.flush();
            process.waitFor();
        } catch (Exception e) {
            DnsServerActivity.displayer("err:" + e.getMessage() + "\r\n");
            return null;
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
                 //process.destroy();
            } catch (Exception e) {
                DnsServerActivity.displayer("err:" + e.getMessage() + "\r\n");
                return null;
            }
        }
        DnsServerActivity.displayer("Command finished" + "\r\n");

        return process;
    }

    public static String readStreamString(InputStream is) throws IOException {
        StringBuffer localStringBuffer = new StringBuffer();
        InputStreamReader localInputStreamReader = new InputStreamReader(is);
        char[] arrayOfChar = new char[65536];
        int res = 0;
        while (res >= 0) {
            res = localInputStreamReader.read(arrayOfChar);

            if (res >= 0) {
                localStringBuffer.append(arrayOfChar, 0, res);
            }

        }

        return localStringBuffer.toString();
    }

    public static String execOnce(String cmd) throws IOException {

        java.lang.Process localProcess = Runtime.getRuntime().exec(cmd);

        // String[] args = cmd.split("\\s+");;
        // java.lang.Process localProcess = Runtime.getRuntime().exec(args);

        // java.lang.Process localProcess = Runtime.getRuntime().exec("sh");
        // DataOutputStream os = new
        // DataOutputStream(localProcess.getOutputStream());
        // os.writeBytes(cmd + "\n");
        // os.writeBytes("exit" + "\n");
        // os.flush();

        return readStreamString(localProcess.getInputStream());

    }

    public static int getProcessPid(String processName) {
        try {

            String output = execOnce("ps");
            String[] lines = output.split("\n");

            for (int i = 0; i < lines.length; i++) {
                // print("line=" + lines[i]);
                String[] attr = lines[i].split("[\\s]+");

                // print("attr.length =" + attr.length );
                if (attr.length != 9)
                    continue;

                String name = attr[8];
                int pid = Integer.parseInt(attr[1]);
                // print("pid=" + pid + ", name=" + name);
                if (name.equals(processName))
                    return pid;
            }

            return -1;
        } catch (Exception e) {
            e.printStackTrace();
            return -1;
        }
    }

}

 2. 通过简单的页面使用上述的java 类， 实现开控制相关命令行程序的启动，同时打印相关命令行的输出log：

public class DnsServerActivity extends Activity {
    /** Called when the activity is first created. */

    public static TextView msgEditText;
    public static ScrollView msgScrollView;
    public Process process = null;

    private static final String TAG = "DnsServerActivity";
    public boolean stop_flag = false;
    public static boolean logdisplay = true;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        msgEditText = (TextView) findViewById(R.id.dns_textview);
        msgScrollView = (ScrollView) findViewById(R.id.dns_msg);

        CheckBox cb = (CheckBox) findViewById(R.id.dns_cb);
        cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
                if (logdisplay == true) {
                    logdisplay = false;
                } else {
                    logdisplay = true;
                }

                displayer("\r\ndisplay log: " + logdisplay + "\r\n");
            }
        });

        mThread.start();

    }

    public static Handler handler = new Handler();

    public static void displayer(final String content) {
        handler.post(new Runnable() {
            @Override
            public void run() {
                // msgEditText.append("\r\n");

                if (logdisplay == false) {
                    return;
                }

                msgEditText.append(content);
                // Toast.makeText(getApplicationContext(), content,
                // Toast.LENGTH_LONG).show();

                handler.post(scrollToBottom);
            }
        });
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        stop_flag = true;

        displayer("dns is onDestroy ... \r\n");
        super.onDestroy();
    }

    public static Runnable scrollToBottom = new Runnable() {
        @Override
        public void run() {
            int off = msgEditText.getMeasuredHeight()
                    - msgScrollView.getHeight();
            if (off > 0) {
                msgScrollView.scrollTo(0, off);
            }
        }
    };

    private Thread mThread = new Thread() {

        Process process = null;
        int procesId = -1;

        public void run() {
            displayer("\r\nthread is runing in \r\n");

            String dir = getApplicationContext().getFilesDir().getParent();
            String cmd = "." + dir + "/lib/cmdline";
            String pname = "." + dir + "/lib/cmdline";


            if ((procesId = SystemManager.getProcessPid(pname)) > 0) {
                displayer("dns has already run with id --: " + procesId
                        + "\r\n");
                process = SystemManager.RootCommand("kill " + procesId);
                process.destroy();
                process = null;
                displayer("pthread " + procesId + " has been killed\r\n");
            }

            try {
                Thread.sleep(5000);
            } catch (InterruptedException e2) {
                // TODO Auto-generated catch block
                e2.printStackTrace();
            }

            process = SystemManager.RootCommand(cmd + "&");
            displayer("\r\n\r\nstart cmd: \n" + cmd + "&" + "\r\n\r\n");

            InputStream in = process.getInputStream();
            InputStream errIn = process.getErrorStream();

            LineNumberReader input = new LineNumberReader(
                    new InputStreamReader(in));
            LineNumberReader errorInput = new LineNumberReader(
                    new InputStreamReader(errIn));
            String line = null;

            int errtag = 0;
            int inputag = 0;

            while (!stop_flag) {
                try {
                    displayer("\r\ndns sever is runnig --- " + "\r\n");

                    if (input.ready() && (line = input.readLine()) != null) {
                        displayer(line);
                        inputag = 1;
                    } else {
                        inputag = 0;
                    }

                    if (errorInput.ready()
                            && (line = errorInput.readLine()) != null) {
                        displayer(line);
                        errtag = 1;
                    } else {
                        errtag = 0;
                    }

                    if (errtag == 0 && inputag == 0) {
                        Thread.sleep(500);
                        displayer("no log in ...\r\n");
                    }

                } catch (IOException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                    break;
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }

            process.destroy();

            displayer("dns sever is quiting" + "\r\n");

        }
    };
}

 3. android 打包命令行程序可以通过基本的方式，但是还有另外一种方式：例如，如果想打包命令行程序，那么可以将编译生成的命令行程序cmdline 改名为libcmbine.so， 然后将其放入android project 的lib目录下，这样在安装apk后，相应的目录安装目录lib下就可以看到命令行程序libcmbine.so，上述的例子便是基于此完成的。