WakeLock lock, unLock;
KeyguardManager km;
KeyguardLock kl;

unLock = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "bright");
// 得到键盘锁管理器对象
km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
kl = km.newKeyguardLock("unLock");

void lockScreen() {
  // 锁屏
  kl.reenableKeyguard();
  // 释放wakeLock，关灯
  if(unLock.isHeld())
    unLock.release();
}
void unLockScreen() {
  // 点亮屏幕
  if(!unLock.isHeld())
    unLock.acquire();
  // 解锁
  kl.disableKeyguard();
}

{
  lockScreen();
  getListView().getHandler().postDelayed(new Runnable() {
    @Override
    public void run() {
      unLockScreen();
    }
  }, 5000);
  break;
}