一键锁屏

//2.2以上的版本支持一键锁屏

private static final int MINSDK_CANUSE_ONEKEYLOCK = 8;

 
  /**
  * 判断一键锁屏功能是否被激活
  * 
  * @param context
  * @return
  */
  public static boolean isOneKeyLockActive(Context context) {
  if (android.os.Build.VERSION.SDK_INT >= MINSDK_CANUSE_ONEKEYLOCK) {
  DevicePolicyManager devicepolicymanager = (DevicePolicyManager) context
  .getSystemService(Context.DEVICE_POLICY_SERVICE);
 
  return devicepolicymanager.isAdminActive(new ComponentName(context,
  LockScreenReceiver.class));
  } else {
  return false;
  }
  }
 
  /**
  * 实施锁屏
  * 
  * @param context
  */
  public static void lockNow(Context context) {
  if (android.os.Build.VERSION.SDK_INT >= MINSDK_CANUSE_ONEKEYLOCK) {
  DevicePolicyManager devicepolicymanager = (DevicePolicyManager) context
  .getSystemService(Context.DEVICE_POLICY_SERVICE);
 
  devicepolicymanager.lockNow();
  }
  }
 
  /**
  * 取消(反激活)一键锁屏功能
  * 
  * @param context
  */
  public static void unActiveOneKeyLock(Context context) {
  if (android.os.Build.VERSION.SDK_INT >= MINSDK_CANUSE_ONEKEYLOCK) {
  DevicePolicyManager devicepolicymanager = (DevicePolicyManager) context
  .getSystemService(Context.DEVICE_POLICY_SERVICE);
 
  devicepolicymanager.removeActiveAdmin(new ComponentName(context,
  LockScreenReceiver.class));
  }

  }

//激活一键锁屏

                                Intent i = new Intent("android.app.action.ADD_DEVICE_ADMIN");
  i.putExtra("android.app.extra.DEVICE_ADMIN", new ComponentName(MainActivity.this,
  LockScreenReceiver.class));
  String text = getString(R.string.onekey_lock_tip2);
  i.putExtra("android.app.extra.ADD_EXPLANATION", text);
  startActivity(i);

/**
  * 用于承载一键锁屏功能，不需要实现
  */
 public class LockScreenReceiver extends DeviceAdminReceiver
 {
 }