android上代码去执行"su"命令

执行“su”命令有一个前提，那就是手机被root过或者是手机里面的busybox支持“su”命令，否则会执行失败。

具体实现代码如下：

import java.io.BufferedReader;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.util.ArrayList;import android.util.Log;public abstract class AExecuteAsRoot {    public static boolean canRunRootCommands() {        boolean retval = false;        Process suProcess;        try {            suProcess = Runtime.getRuntime().exec("su");            DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());            DataInputStream osRes = new DataInputStream(suProcess.getInputStream());            if (null != os && null != osRes) {                // Getting the id of the current user to check if this is root                os.writeBytes("id\n");                os.flush();                String currUid = osRes.readLine();                boolean exitSu = false;                if (null == currUid) {                    retval = false;                    exitSu = false;                    Log.d("ROOT", "Can't get root access or denied by user");                } else if (true == currUid.contains("uid=0")) {                    retval = true;                    exitSu = true;                    Log.d("ROOT", "Root access granted");                } else {                    retval = false;                    exitSu = true;                    Log.d("ROOT", "Root access rejected: " + currUid);                }                if (exitSu) {                    os.writeBytes("exit\n");                    os.flush();                }            }        } catch (Exception e) {            // Can't get root !            // Probably broken pipe exception on trying to write to output            // stream after su failed, meaning that the device is not rooted            retval = false;            Log.d("ROOT",                    "Root access rejected [" + e.getClass().getName() + "] : " + e.getMessage());        }        return retval;    }    public final boolean execute() {        boolean retval = false;        try {            ArrayList<String> commands = getCommandsToExecute();            if (null != commands && commands.size() > 0) {                Process process = Runtime.getRuntime().exec("su");                DataOutputStream os = new DataOutputStream(process.getOutputStream());                for (String currCommand : commands) {                    os.writeBytes(currCommand + "\n");                    os.flush();                }                os.writeBytes("exit\n");                os.flush();                BufferedReader reader = new BufferedReader(new InputStreamReader(                        process.getInputStream()));                int read;                char[] buffer = new char[4096];                StringBuffer output = new StringBuffer();                while ((read = reader.read(buffer)) > 0) {                    output.append(buffer, 0, read);                }                reader.close();                try {                    int suProcessRetval = process.waitFor();                    if (255 != suProcessRetval) {                        retval = true;                    } else {                        retval = false;                    }                    System.out.println("BBBB: "+output.toString()) ;                } catch (Exception ex) {                    //Log.e("Error executing root action", ex);                }            }        } catch (IOException ex) {            Log.w("ROOT", "Can't get root access", ex);        } catch (SecurityException ex) {            Log.w("ROOT", "Can't get root access", ex);        } catch (Exception ex) {            Log.w("ROOT", "Error executing internal operation", ex);        }        return retval;    }    protected abstract ArrayList<String> getCommandsToExecute();}

import java.util.ArrayList;import android.app.Activity;import android.os.Bundle;import android.util.Log;public class SuActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        try {            Log.d("ROOT", "result:" + new ExecuteAsRoot().execute());        } catch (Exception e) {            e.printStackTrace();        }    }    private class ExecuteAsRoot extends AExecuteAsRoot {        @Override        protected ArrayList<String> getCommandsToExecute() {            ArrayList<String> list = new ArrayList<String>();            list.add("add kill-server");            list.add("adb devices");            return list;        }    }}

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