generic way to track last seen activity - requires GET_TASKS permission

Author: maxme

WordPressUtils/src/main/java/org/wordpress/android/util/README.md renamed to WordPressUtils/README.md

@@ -0,0 +1,24 @@
+package org.wordpress.android.util;
+
+import android.app.ActivityManager;
+import android.app.ActivityManager.RunningTaskInfo;
+import android.content.Context;
+
+import java.util.List;
+
+public class ActivityUtils {
+    public static final String UNKNOWN = "unknown";
+
+    /**
+     * Requires android.permission.GET_TASKS app permission
+     */
+    public static String getTopActivityClassName(Context context) {
+        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        // Get the most recent running task
+        List<RunningTaskInfo> tasks = am.getRunningTasks(1);
+        if (tasks != null && tasks.get(0) != null && tasks.get(0).topActivity != null) {
+            return tasks.get(0).topActivity.getClassName();
+        }
+        return UNKNOWN;
+    }
+}