Question

如何获得当前的activity android

Answer 1

android开发中获取当前的Activity有多种情况；

1. 在Activity中，this就是当前的Activity，例如this.startActivity。

2. 在Fragment中可以通过 getActivity()来得到当前装载这个Fragment的Activity。

3. 通过Activity堆栈来获取当前显示的这个Activity

   ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);

   ComponentName cn = am.getRunningTasks(1).get(0).topActivity;

Answer 2

getApplicationContext()

Answer 3

ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningTaskInfo> runningTasks = manager.getRunningTasks(1);
RunningTaskInfo cinfo = null;
if (runningTasks != null && runningTasks.size() > 0) {
cinfo = runningTasks.get(0);
}
ComponentName component = null;
if (cinfo != null) {
component = cinfo.topActivity;
}
String componentName = null;
if (component != null) {
componentName = component.getClassName();
}
//当前activityName
componentName;