The method of obtaining Activity stack and judging the current Activity position

Demand

It is necessary to pop up the pop-up box globally in the whole app, and process it when receiving the broadcast.

However, BaseActivity derives N Activity, and the broadcast in BaseActivity will execute N times, resulting in repeated addition of bullet boxes. All the decisions made in the broadcast, only Activity at the top of the stack can process broadcast messages.

Realization

Get the task stack

You must add permissions:

<!-- Get Activity Task stack   Authority -->
<uses-permission android:name="android.permission.GET_TASKS" />

Specific implementation, acquisition stack and its contents:

//  Get activity Task stack 
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
ActivityManager.RunningTaskInfo info = manager.getRunningTasks(1).get(0);

//  Class name  .ui.mobile.activity.WebsiteLoginActivity
String shortClassName = info.topActivity.getShortClassName(); 

//  Full class name  com.haofang.testapp.ui.mobile.activity.WebsiteLoginActivity
String className = info.topActivity.getClassName(); 

//  Package name  com.haofang.testapp
String packageName = info.topActivity.getPackageName(); 

Package name and full name of current Activity:

//  Package name  com.haofang.testapp
BaseActivity.this.getPackageName()
//  Class name  ui.main.MainActivity
BaseActivity.this.getLocalClassName()

After comparison, the non-target Activity can be avoided