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在使用Android WebView的时候，可能会造成Activity的内存泄漏，这个是Android的Bug,目前发现在WebView内部在使用TintResources时会发生内存泄漏，但是在appcompat-v7:23.2.1中已经修复了这个问题。所以当发生WebView的Context内存泄漏时,如果泄漏引用是来自TickResources时，可以将appcompat-v7包换成23.2.1或以上就可以解决了。具体原因我们可以来下源码：
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 for 11 * things like {@link android.graphics.drawable.DrawableContainer}s which can retrieve 12 * their children via this method. 13 */ 14 @Override 15 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 for 11 * things like {@link android.graphics.drawable.DrawableContainer}s which can retrieve 12 * their children via this method. 13 */ 14 @Override 15 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版本只是将Context的强引用改成了弱引用来避免内存泄漏。
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原文地址：http://www.cnblogs.com/recwert/p/5390641.html
