1 files changed, 68 insertions, 0 deletions
diff --git a/core/src/main/kotlin/ca/allanwang/kau/swipe/SwipeBackHelper.java b/core/src/main/kotlin/ca/allanwang/kau/swipe/SwipeBackHelper.java
new file mode 100644
index 0000000..b72112e
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/swipe/SwipeBackHelper.java
@@ -0,0 +1,68 @@
+package ca.allanwang.kau.swipe;
+
+import android.app.Activity;
+
+import java.util.Stack;
+
+/**
+ * 滑动的全局管理类
+ */
+public class SwipeBackHelper {
+
+    private static final Stack<SwipeBackPage> mPageStack = new Stack<>();
+
+    private static SwipeBackPage findHelperByActivity(Activity activity){
+        for (SwipeBackPage swipeBackPage : mPageStack) {
+            if (swipeBackPage.mActivity == activity) return swipeBackPage;
+        }
+        return null;
+    }
+
+    public static SwipeBackPage getCurrentPage(Activity activity){
+        SwipeBackPage page;
+        if ((page = findHelperByActivity(activity)) == null){
+            throw new RuntimeException("You Should call SwipeBackHelper.onCreate(activity) first");
+        }
+        return page;
+    }
+
+    public static void onCreate(Activity activity) {
+        SwipeBackPage page;
+        if ((page = findHelperByActivity(activity)) == null){
+            page = mPageStack.push(new SwipeBackPage(activity));
+        }
+        page.onCreate();
+    }
+
+    public static void onPostCreate(Activity activity){
+        SwipeBackPage page;
+        if ((page = findHelperByActivity(activity)) == null){
+            throw new RuntimeException("You Should call SwipeBackHelper.onCreate(activity) first");
+        }
+        page.onPostCreate();
+    }
+
+    public static void onDestroy(Activity activity){
+        SwipeBackPage page;
+        if ((page = findHelperByActivity(activity)) == null){
+            throw new RuntimeException("You Should call SwipeBackHelper.onCreate(activity) first");
+        }
+        mPageStack.remove(page);
+        page.mActivity=null;
+    }
+
+    public static void finish(Activity activity){
+        SwipeBackPage page;
+        if ((page = findHelperByActivity(activity)) == null){
+            throw new RuntimeException("You Should call SwipeBackHelper.onCreate(activity) first");
+        }
+        page.scrollToFinishActivity();
+    }
+
+    static SwipeBackPage getPrePage(SwipeBackPage activity){
+        int index = mPageStack.indexOf(activity);
+        if (index>0)return mPageStack.get(index-1);
+        else return null;
+    }
+
+}