Android开关机代码

此应用需要获取了Root权限才行。
代码很简单，如下：

package com.example.reboot;import java.io.DataOutputStream;import java.io.IOException;import android.app.Activity;import android.app.AlertDialog;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;public class MainActivity extends Activity {private Button reboot=null;private Button shutdown=null;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.activity_main);reboot=(Button)super.findViewById(R.id.reboot);shutdown=(Button)super.findViewById(R.id.shutdown);reboot.setOnClickListener(new Reboot());shutdown.setOnClickListener(new ShutDown());}private class Reboot implements OnClickListener{@Overridepublic void onClick(View v) { String cmd = "su -c reboot";            try {                    Runtime.getRuntime().exec(cmd);            } catch (IOException e) {                   new AlertDialog.Builder(MainActivity.this).setTitle("Error").setMessage(                                    e.getMessage()).setPositiveButton("OK", null).show();            }}}private class ShutDown implements OnClickListener{@Overridepublic void onClick(View v) {try {                   Process process = Runtime.getRuntime().exec("su");                  DataOutputStream out = new DataOutputStream(                          process.getOutputStream());                  out.writeBytes("reboot -p\n");                  out.writeBytes("exit\n");                  out.flush();              } catch (IOException e) {              new AlertDialog.Builder(MainActivity.this).setTitle("Error").setMessage(                        e.getMessage()).setPositiveButton("OK", null).show();            }  }}}