Improve preference, use leakcanary, start GalleryDetailScene

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

@@ -16,15 +16,23 @@
 package com.hippo.scene;
 
 import android.app.Application;
+import android.content.Context;
+
+import com.squareup.leakcanary.LeakCanary;
+import com.squareup.leakcanary.RefWatcher;
 
 public class SceneApplication extends Application {
 
     private SceneManager mSceneManager;
 
+    private RefWatcher mRefWatcher;
+
     @Override
     public void onCreate() {
         super.onCreate();
 
+        mRefWatcher = LeakCanary.install(this);
+
         mSceneManager = SceneManager.getInstance();
         StageActivity.setSceneManager(mSceneManager);
         Scene.setSceneManager(mSceneManager);
@@ -33,4 +41,9 @@ public class SceneApplication extends Application {
     public SceneManager getSceneManager() {
         return mSceneManager;
     }
+
+    public static RefWatcher getRefWatcher(Context context) {
+        SceneApplication application = (SceneApplication) context.getApplicationContext();
+        return application.mRefWatcher;
+    }
 }