Add findStageActivityById

app/src/main/java/com/hippo/scene/SceneApplication.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2016 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.scene;
+
+import android.app.Application;
+import android.util.SparseArray;
+
+import com.hippo.yorozuya.IntIdGenerator;
+
+public class SceneApplication extends Application {
+
+    private IntIdGenerator mIdGenerator = new IntIdGenerator();
+    private SparseArray<StageActivity> mStageMap = new SparseArray<>();
+
+    void registerStageActivity(StageActivity stage) {
+        int id = mIdGenerator.nextId();
+        mStageMap.put(id, stage);
+        stage.onRegister(id);
+    }
+
+    void unregisterStageActivity(int id) {
+        int index = mStageMap.indexOfKey(id);
+        if (index >= 0) {
+            StageActivity stage = mStageMap.valueAt(index);
+            mStageMap.remove(id);
+            stage.onUnregister();
+        }
+    }
+
+    public StageActivity findStageActivityById(int id) {
+        return mStageMap.get(id);
+    }
+}