android 手机重启实现

public class RebootAndroid extends Activity implements OnClickListener {
        private Button btnReboot;

        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);
                btnReboot = (Button) findViewById(R.id.btnReboot);
                btnReboot.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
                // TODO Auto-generated method stub

                String cmd = "su -c reboot";
                try {
                        Runtime.getRuntime().exec(cmd);
                } catch (IOException e) {
                        // TODO Auto-generated catch block

                        new AlertDialog.Builder(this).setTitle("Error").setMessage(
                                        e.getMessage()).setPositiveButton("OK", null).show();
                }
        }
}

关机：
In frameworks/base/services/java/com/android/server/BatteryService.java
Intent intent = new Intent(Intent.ACTION_REQUEST_SHUTDOWN);
  intent.putExtra(Intent.EXTRA_KEY_CONFIRM, false);
  intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  mContext.startActivity(intent);
重启：
Intent i = new Intent(Intent.ACTION_REBOOT);
i.putExtra("nowait", 1);
i.putExtra("interval", 1);
i.putExtra("window", 0);
sendBroadcast(i);

//重启代码位于frameworks\base\core\jni\android_os_Power.cpp,里面有
static void android_os_Power_shutdown(JNIEnv *env, jobject clazz)
{/*关机*/
    sync();
#ifdef HAVE_ANDROID_OS
    reboot(RB_POWER_OFF);
#endif
}

static void android_os_Power_reboot(JNIEnv *env, jobject clazz, jstring reason)
{/*重启*/
    sync();
#ifdef HAVE_ANDROID_OS
    if (reason == NULL) {
        reboot(RB_AUTOBOOT);
    } else {
        const char *chars = env->GetStringUTFChars(reason, NULL);
        __reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2,
                 LINUX_REBOOT_CMD_RESTART2, (char*) chars);
        env->ReleaseStringUTFChars(reason, chars); // In case it fails.
     }
    jniThrowIOException(env, errno);
#endif
}