Xamarin Android OutOfMemoryErrorビューページャーの大きな画像

Question

ImageViewがバックグラウンドであるビューページャーがあります。リソースイメージは750x1205で、私はそれらをdrawable-xhdpiに保ちます。他のサイズの画像はありません。

私はいくつかのポイント、OutOfMemoryErrorの

mPagerBackground.SetImageResource(page.backgroundResId); 

にスローされた時にページャをスクロールすると、私はAndroidManifestにandroid:largeHeap="true"を追加し、私もちょうど私のアダプタでSetImageResource前((BitmapDrawable)mPagerBackground.Drawable).Bitmap.Recycle();を追加しましたが、それらの非は、問題を解決しています。

画像のサイズを変更せずにこの問題を解決する方法はありますか？

ご協力いただきありがとうございます。

エラー：

Java.Lang.OutOfMemoryError: 
    at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() [0x0000c] in /Users/builder/data/lanes/3053/a94a03b5/source/mono/external/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143 
    at Android.Runtime.JNIEnv.CallVoidMethod (IntPtr jobject, IntPtr jmethod, Android.Runtime.JValue* parms) [0x00063] in /Users/builder/data/lanes/3053/a94a03b5/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:571 
    at Android.Widget.ImageView.SetImageResource (Int32 resId) [0x0005a] in /Users/builder/data/lanes/3053/a94a03b5/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Widget.ImageView.cs:1350 
    at [...](Android.Views.ViewGroup container, Int32 position) [0x0012c] in[...] Android.Support.V4.View.PagerAdapter.n_InstantiateItem_Landroid_view_ViewGroup_I (IntPtr jnienv, IntPtr native__this, IntPtr native_container, Int32 position) [0x00011] in <filename unknown>:0 
    at at (wrapper dynamic-method) System.Object:9d522553-ebab-4c12-bb3c-1791ac15f74a (intptr,intptr,intptr,int) 
    at --- End of managed exception stack trace --- 
    at java.lang.OutOfMemoryError 
    at at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) 
    at at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:587) 
    at at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:422) 
    at at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:840) 
    at at android.content.res.Resources.loadDrawable(Resources.java:2110) 
    at at android.content.res.Resources.getDrawable(Resources.java:700) 
    at at android.support.v4.content.ContextCompat.getDrawable(ContextCompat.java:323) 
    at at android.support.v7.widget.TintManager.getDrawable(TintManager.java:175) 
    at at android.support.v7.widget.TintManager.getDrawable(TintManager.java:168) 
    at at android.support.v7.widget.AppCompatImageHelper.setImageResource(AppCompatImageHelper.java:51) 
    at at android.support.v7.widget.AppCompatImageView.setImageResource(AppCompatImageView.java:72) 
    at at md50e0099531e777fd8d5bed58953e4d813.EscapeLoungesPagerAdapter.n_instantiateItem(Native Method) 
    at at md50e0099531e777fd8d5bed58953e4d813.EscapeLoungesPagerAdapter.instantiateItem(EscapeLoungesPagerAdapter.java:39) 
    at at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:870) 
    at at android.support.v4.view.ViewPager.populate(ViewPager.java:1086) 
    at at android.support.v4.view.ViewPager.populate(ViewPager.java:952) 
    at at android.support.v4.view.ViewPager$3.run(ViewPager.java:251) 
    at at android.support.v4.view.ViewPager.completeScroll(ViewPager.java:1849) 
    at at android.support.v4.view.ViewPager.onInterceptTouchEvent(ViewPager.java:1978) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1859) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at md50e0099531e777fd8d5bed58953e4d813.ResideMenu.n_dispatchTouchEvent(Native Method) 
    at at md50e0099531e777fd8d5bed58953e4d813.ResideMenu.dispatchTouchEvent(ResideMenu.java:61) 
    at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216) 
    at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
    at at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2068) 
    at at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1515) 
    at at android.app.Activity.dispatchTouchEvent(Activity.java:2458) 
    at at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) 
    at at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) 
    at at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2016) 
    at at android.view.View.dispatchPointerEvent(View.java:7886) 
    at at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3954) 
    at at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3833) 
    at at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399) 
    at at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449) 
    at at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418) 
    at at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3525) 
    at at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426) 
    at at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3582) 
    at at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399) 
    at at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449) 
    at at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418) 
    at at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426) 
    at at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399) 
    at at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5602) 
    at at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5582) 
    at at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5553) 
    at at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5682) 
    at at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) 
    at at android.os.MessageQueue.nativePollOnce(Native Method) 
    at at android.os.MessageQueue.next(MessageQueue.java:138) 
    at at android.os.Looper.loop(Looper.java:123) 
    at at android.app.ActivityThread.main(ActivityThread.java:5017) 
    at at java.lang.reflect.Method.invokeNative(Native Method) 
    at at java.lang.reflect.Method.invoke(Method.java:515) 
    at at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
    at at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
    at at dalvik.system.NativeStart.main(Native Method) 

はEDIT：

SushiHangoverによって示唆されるように、私は以下のコードを試してみましたが、それは問題を解決する助けにはなりませんでした。

View view = (View) objectValue; 
      ImageView imageView = (ImageView)view.FindViewById (Resource.Id.image_id); 
      Drawable drawable = imageView.Drawable; 
      if (drawable is BitmapDrawable) { 
       BitmapDrawable bitmapDrawable = (BitmapDrawable)drawable; 
       if (bitmapDrawable != null) { 
        Bitmap bitmap = bitmapDrawable.Bitmap; 
        if (bitmap != null && !bitmap.IsRecycled) { 
         bitmap.Recycle(); 
        } 
       } 
      } 

      container.RemoveView(view); 

有望なのはピカソを使用することですが、画像の読み込みはビューページャーにとって非常に遅いです。

Answer 1

1）C＃の場合：.Recycleの代わりにImageに.Disposeを使用しますが、最初にimageViewのimageプロパティをNULLに設定します（イメージにDisposeを呼び出す前に）。

2）次に、ガベージコレクタを強制：Gc.Collect（）

Answer 2

あなたがそれを使用して終わった後、あなたはビットマップをきれいにする必要があります。

public void Cleanup(Bitmap bitmap) 
{ 
      if (bitmap == null) 
       return; 
      if (!bitmap.IsRecycled) 
       bitmap.Recycle(); 

      bitmap.Dispose(); 
      bitmap = null; 
}