[M]优化内存占用，解决资源回收问题 & update README.md

Author: Hitomis

README.md

@@ -26,6 +26,8 @@ transferee 可以帮助你完成从缩略视图到原视图的无缝过渡转变
 # Sample
 [demo.apk](https://github.com/Hitomis/transferee/tree/master/preview/app-release.apk)
 
+<img src="preview/memory.png" />
+
 
 # Dependency
 step1.
@@ -111,6 +113,11 @@ step 3: 显示 transferee
 transferee.apply(config).show();
 ```
 
+step 4: 离开页面的时候需要销毁 transferee 中的资源，防止内存泄漏 (建议写在 onDestroy 方法中)
+```
+transferee.destroy()
+```
+
 # Config
 | 属性 | 说明 |
 | :--: | :--: |
@@ -150,6 +157,7 @@ transferee.apply(config).show();
 | isShown() | transferee 是否显示 |
 | dismiss() | 关闭 transferee |
 | clear() | 清除图片和视频等所有缓存文件 |
+| destroy() | 销毁 transferee 使用到的资源， 防止内存泄漏 |
 | getImageFile(url) | 获取与 url 对应的缓存图片 |
 | setOnTransfereeStateChangeListener(listener) | 设置 transferee 显示/关闭状态改变的监听器 |
 
@@ -164,6 +172,8 @@ transferee.apply(config).show();
    - 修复打开和关闭的状态不能保持一致的 bug
    - 下滑手势优化
    - 重置不再当前显示区域的图片状态
+   - 优化了内存占用，当浏览多图相册时，保证内存稳定
+   - 解决了因为 Config 资源未回收而导致的内存泄漏问题
 
 + v1.6.0
    - 新增视频播放以及视频配套功能的支持

Transferee/src/main/java/com/hitomi/tilibrary/transfer/TransferAdapter.java

@@ -11,8 +11,8 @@
 import androidx.annotation.NonNull;
 import androidx.viewpager.widget.PagerAdapter;
 
-import com.hitomi.tilibrary.view.video.ExoVideoView;
 import com.hitomi.tilibrary.view.image.TransferImage;
+import com.hitomi.tilibrary.view.video.ExoVideoView;
 
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
@@ -25,7 +25,6 @@
  * email: 196425254@qq.com
  */
 class TransferAdapter extends PagerAdapter {
-
     private TransferLayout transfer;
     private int showIndex;
     private int imageSize;
@@ -38,8 +37,7 @@ class TransferAdapter extends PagerAdapter {
         this.imageSize = imageSize;
         this.showIndex = nowThumbnailIndex + 1 == imageSize
                 ? nowThumbnailIndex - 1 : nowThumbnailIndex + 1;
-        this.showIndex = showIndex < 0 ? 0 : showIndex;
-
+        this.showIndex = Math.max(showIndex, 0);
         containLayoutArray = new SparseArray<>();
     }
 
@@ -56,63 +54,24 @@ public boolean isViewFromObject(View view, Object object) {
     @Override
     public void destroyItem(ViewGroup container, int position, Object object) {
         container.removeView((View) object);
-    }
-
-    /**
-     * 获取指定索引页面中的 TransferImage
-     *
-     * @param position
-     * @return
-     */
-    TransferImage getImageItem(int position) {
-        FrameLayout parentLayout = containLayoutArray.get(position);
-        if (parentLayout != null && parentLayout.getChildAt(0) instanceof TransferImage) {
-            return ((TransferImage) parentLayout.getChildAt(0));
-        }
-        return null;
-    }
-
-    /**
-     * 获取指定页面中的 ExoVideoView
-     *
-     * @param position
-     * @return
-     */
-    ExoVideoView getVideoItem(int position) {
-        FrameLayout parentLayout = containLayoutArray.get(position);
-        if (parentLayout != null && parentLayout.getChildAt(0) instanceof ExoVideoView) {
-            return ((ExoVideoView) parentLayout.getChildAt(0));
-        }
-        return null;
-    }
-
-    SparseArray<FrameLayout> getCacheItems() {
-        return containLayoutArray;
-    }
-
-    FrameLayout getParentItem(int position) {
-        return containLayoutArray.get(position);
-    }
-
-    void setOnInstantListener(OnInstantiateItemListener listener) {
-        this.onInstantListener = listener;
+        containLayoutArray.remove(position);
+        transfer.loadedIndexSet.remove(position);
     }
 
     @NonNull
     @Override
     public Object instantiateItem(@NonNull ViewGroup container, int position) {
         // ViewPager instantiateItem 顺序：按 position 递减 OffscreenPageLimit，
         // 再从 position 递增 OffscreenPageLimit 的次序创建页面
-        FrameLayout parentLayout = containLayoutArray.get(position);
 
+        FrameLayout parentLayout = containLayoutArray.get(position);
         if (parentLayout == null) {
             parentLayout = newParentLayout(container, position);
-            containLayoutArray.put(position, parentLayout);
+            containLayoutArray.append(position, parentLayout);
 
             if (position == showIndex && onInstantListener != null)
                 onInstantListener.onComplete();
         }
-
         container.addView(parentLayout);
         return parentLayout;
     }
@@ -147,6 +106,46 @@ private FrameLayout newParentLayout(ViewGroup container, final int pos) {
         return parentLayout;
     }
 
+    /**
+     * 获取指定索引页面中的 TransferImage
+     *
+     * @param position
+     * @return
+     */
+    TransferImage getImageItem(int position) {
+        FrameLayout parentLayout = containLayoutArray.get(position);
+        if (parentLayout != null && parentLayout.getChildAt(0) instanceof TransferImage) {
+            return ((TransferImage) parentLayout.getChildAt(0));
+        }
+        return null;
+    }
+
+    /**
+     * 获取指定页面中的 ExoVideoView
+     *
+     * @param position
+     * @return
+     */
+    ExoVideoView getVideoItem(int position) {
+        FrameLayout parentLayout = containLayoutArray.get(position);
+        if (parentLayout != null && parentLayout.getChildAt(0) instanceof ExoVideoView) {
+            return ((ExoVideoView) parentLayout.getChildAt(0));
+        }
+        return null;
+    }
+
+    SparseArray<FrameLayout> getCacheItems() {
+        return containLayoutArray;
+    }
+
+    FrameLayout getParentItem(int position) {
+        return containLayoutArray.get(position);
+    }
+
+    void setOnInstantListener(OnInstantiateItemListener listener) {
+        this.onInstantListener = listener;
+    }
+
     interface OnInstantiateItemListener {
         void onComplete();
     }

Transferee/src/main/java/com/hitomi/tilibrary/transfer/TransferConfig.java

@@ -216,10 +216,6 @@ public void setSourceUrlList(List<String> sourceUrlList) {
         this.sourceUrlList = sourceUrlList;
     }
 
-    public List<Uri> getSourceUriList() {
-        return sourceUriList;
-    }
-
     public void setSourceUriList(List<Uri> sourceUriList) {
         this.sourceUriList = sourceUriList;
     }
@@ -333,6 +329,21 @@ public void setFooterSize(int footerSize) {
         this.footerSize = footerSize;
     }
 
+    public void destroy() {
+        setImageView(null);
+        setCustomView(null);
+        setListView(null);
+        setRecyclerView(null);
+        setProgressIndicator(null);
+        setIndexIndicator(null);
+        setImageLoader(null);
+        setOriginImageList(null);
+        setSourceUrlList(null);
+        setSourceUriList(null);
+        setMissDrawable(null);
+        setErrorDrawable(null);
+    }
+
     public static class Builder {
         private int nowThumbnailIndex;
         private int offscreenPageLimit;
@@ -517,14 +528,6 @@ public Builder setSourceUriList(List<Uri> sourceUriList) {
             return this;
         }
 
-//        /**
-//         * 缩略图地址集合
-//         */
-//        public Builder setThumbnailImageList(List<String> thumbnailImageList) {
-//            this.thumbnailImageList = thumbnailImageList;
-//            return this;
-//        }
-
         /**
          * 过渡前原始的 ImageView 集合
          */

Transferee/src/main/java/com/hitomi/tilibrary/transfer/TransferLayout.java

@@ -43,11 +43,11 @@ class TransferLayout extends FrameLayout {
 
     private TransferChangeListener transChangeListener;
     private OnLayoutResetListener layoutResetListener;
-    private Set<Integer> loadedIndexSet;
 
     TransferImage transImage;
     TransferAdapter transAdapter;
     ViewPager transViewPager;
+    Set<Integer> loadedIndexSet;
     float alpha; // [0.f , 255.f]
     boolean isAnimationRunning;
 

Transferee/src/main/java/com/hitomi/tilibrary/transfer/Transferee.java

@@ -248,6 +248,16 @@ public void setOnTransfereeStateChangeListener(OnTransfereeStateChangeListener l
         transListener = listener;
     }
 
+    /**
+     * 资源销毁，防止内存泄漏
+     */
+    public void destroy() {
+        if (transConfig != null) {
+            transConfig.destroy();
+            transConfig = null;
+        }
+    }
+
     /**
      * Transferee 显示的时候调用 {@link OnTransfereeStateChangeListener#onShow()}
      * <p>

app/build.gradle

@@ -51,4 +51,5 @@ dependencies {
     implementation libGlide
     implementation libPicasso
     implementation libImmersionbar
+    debugImplementation libLeakcanary
 }

app/src/main/java/com/hitomi/transferimage/activity/BaseActivity.java

@@ -43,6 +43,12 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
         testTransferee();
     }
 
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        transferee.destroy();
+    }
+
     @Override
     public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
         if (requestCode != WRITE_EXTERNAL_STORAGE) {

app/src/main/java/com/hitomi/transferimage/activity/LocalImageActivity.java

@@ -13,8 +13,8 @@
 import com.hitomi.tilibrary.style.index.NumberIndexIndicator;
 import com.hitomi.tilibrary.style.progress.ProgressBarIndicator;
 import com.hitomi.tilibrary.transfer.TransferConfig;
-import com.hitomi.transferimage.SourceConfig;
 import com.hitomi.transferimage.R;
+import com.hitomi.transferimage.SourceConfig;
 import com.vansz.glideimageloader.GlideImageLoader;
 import com.zhy.adapter.abslistview.CommonAdapter;
 import com.zhy.adapter.abslistview.ViewHolder;

build.gradle

@@ -49,13 +49,14 @@ project.ext {
     libBaseAdapter = "com.zhy:base-adapter:3.0.3"
     libRecyclerviewAdpater = "com.zhy:base-rvadapter:3.0.3"
     libImmersionbar = "com.gyf.immersionbar:immersionbar:3.0.0"
+    libLeakcanary = "com.squareup.leakcanary:leakcanary-android:2.3"
     // Transferee 核心库所依赖项目
     libAppcompat = "androidx.appcompat:appcompat:1.1.0"
     libSupportRecyclerview = "androidx.recyclerview:recyclerview:1.0.0"
     libExoplayer = "com.google.android.exoplayer:exoplayer:2.10.4"
     libExoExtensionRtmp = "com.google.android.exoplayer:extension-rtmp:2.10.4"
     libProgresspieview = "com.github.filippudak.progresspieview:library:1.0.4"
     libGifDrawable = "pl.droidsonroids.gif:android-gif-drawable:1.2.19"
-    libImmersionbar ="com.gyf.immersionbar:immersionbar:3.0.0"
+    libImmersionbar = "com.gyf.immersionbar:immersionbar:3.0.0"
     libLuban = "top.zibin:Luban:1.1.8"
 }