Android TintResources Leak

標籤：

　　在使用Android WebView的時候，可能會造成Activity的記憶體流失，這個是Android的Bug,目前發現在WebView內部在使用TintResources時會發生記憶體流失，但是在appcompat-v7:23.2.1中已經修複了這個問題。所以當發生WebView的Context記憶體流失時,如果泄漏引用是來自TickResources時，可以將appcompat-v7包換成23.2.1或以上就可以解決了。具體原因我們可以來下源碼：

　　appcompat-v7 23.2.0 中的TintResources:

 1 public class TintResources extends Resources { 2     private final Context mContext; 3  4     public TintResources(@NonNull final Context context, @NonNull final Resources res) { 5         super(res.getAssets(), res.getDisplayMetrics(), res.getConfiguration()); 6         mContext = context; 7     } 8  9     /**10      * We intercept this call so that we tint the result (if applicable). This is needed for11      * things like {@link android.graphics.drawable.DrawableContainer}s which can retrieve12      * their children via this method.13      */14     @Override15     public Drawable getDrawable(int id) throws NotFoundException {16         return AppCompatDrawableManager.get().onDrawableLoadedFromResources(mContext, this, id);17     }18 19     final Drawable superGetDrawable(int id) {20         return super.getDrawable(id);21     }22 }

appcompat-v7 23.2.1中的TintResources:

 1 public class TintResources extends Resources { 2     private final WeakReference<Context> mContextRef; 3  4     public TintResources(@NonNull final Context context, @NonNull final Resources res) { 5         super(res.getAssets(), res.getDisplayMetrics(), res.getConfiguration()); 6         mContextRef = new WeakReference<>(context); 7     } 8  9     /**10      * We intercept this call so that we tint the result (if applicable). This is needed for11      * things like {@link android.graphics.drawable.DrawableContainer}s which can retrieve12      * their children via this method.13      */14     @Override15     public Drawable getDrawable(int id) throws NotFoundException {16         final Context context = mContextRef.get();17         if (context != null) {18             return AppCompatDrawableManager.get().onDrawableLoadedFromResources(context, this, id);19         } else {20             return super.getDrawable(id);21         }22     }23 24     final Drawable superGetDrawable(int id) {25         return super.getDrawable(id);26     }27 }

可以很清楚的看的23.2.1版本只是將Context的強引用改成了弱引用來避免記憶體流失。

Android TintResources Leak