此功能可以獲得第三方的對自己功能的使用情況，可以知道非法操作！

//下面程式碼段是獲取呼叫自己方法的人的包名和類名

1.比如一個叫MainActivity內部呼叫了這個初始化

MainActivity中有呼叫:ABC.getInstance();

結果：name:com.xx.MainActivity

2.比如從MainActivity進入了DemoActivity

DemoActivity中有呼叫:ABC.getInstance();

結果：name:com.xx.DemoActivity

文章出處:https://blog.csdn.net/pangzaifei/article/details/70213731

public static ABC getInstance(Context context) { if (mAbc == null) { synchronized (ABC.class) {//同步程式碼塊  if (mAbc == null) { mAbc = new ABC(context);  } } } PackageManager packageManager = context.getPackageManager();  try { PackageInfo info = packageManager.getPackageInfo(context.getPackageName(), PackageManager.GET_ACTIVITIES);   ActivityInfo[] activities = info.activities;  if (activities.length > 0) { for (int i = 0; i < activities.length - 1; i++) { String name = activities[i].name;  LogHelper.e("fffpzf", "name:" + name);  } } } catch (PackageManager.NameNotFoundException e) { e.printStackTrace();  LogHelper.e("fffpzf", "name 異常");  } return mAbc; }