android代码实现休眠

package com.app; import android.app.Activity; import android.app.admin.DeviceAdminReceiver; import android.app.admin.DevicePolicyManager; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.os.Bundle; public class LockScreen extends DeviceAdminReceiver { static final int RESULT_ENABLE = 1; public static class Controller extends Activity { DevicePolicyManager mDPM; ComponentName mDeviceAdminSample; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //首先我们要获得android设备管理代理 mDPM = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE); //LockScreen 继承自 DeviceAdminReceiver mDeviceAdminSample = new ComponentName(Controller.this, LockScreen.class); //得到当前设备管理器有没有激活 boolean active = mDPM.isAdminActive(mDeviceAdminSample); if (!active) { //如果没有激活的话，就去提示用户激活（第一次运行程序时） getAdmin(); }else{ //如果已经激活的话，就执行立即锁屏 mDPM.lockNow(); } // killMyself ，锁屏之后就立即kill掉我们的Activity，避免资源的浪费; android.os.Process.killProcess(android.os.Process.myPid()); } public void getAdmin() { // Launch the activity to have the user enable our admin. Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN); intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, mDeviceAdminSample); intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "欢迎您的使用！我自己写的程序----张晓飞\t 有问题可以联系我！QQ：295154688"); startActivityForResult(intent, RESULT_ENABLE); } } }