缩放位图分配失败 - Xamarin Visual Studio

【问题标题】：allocation failed for scaled bitmap - Xamarin Visual Studio缩放位图分配失败 - Xamarin Visual Studio
【发布时间】：2017-06-05 11:29:30
【问题描述】：

我有一个包含丰富图片的主页（20KB 到 300KB 的在线订阅源）。我有另一个页面，它在重构的圆圈中显示联系人及其图像（20KB 到 300KB）。在联系页面上，它是一个包含 3 个片段的选项卡。当我从片段 1 切换到 2 到 3 并反之亦然时，我的应用程序停止工作并引发错误。

此外，当应用程序启动主页并滚动浏览提要时，当我移动到下一个活动（联系页面）时，它在到达联系页面之前会滞后一点（几秒钟后，它会崩溃） .查看我的日志，这就是我所看到的，我一直在努力寻找出路。

在我所有的活动中，我都添加了GC.Collect()，以便为其他活动腾出更多空间，但仍然不适合我。

顺便说一下，我将应用程序中的 java 堆大小增加到 1G。我还在我的联系页面上处理了位图。

知道是什么导致了这个问题吗？

例外

[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_call_nonvirtual_object_method'.
[Mono] Probing 'java_interop_jnienv_call_nonvirtual_object_method'.
[Mono] Found as 'java_interop_jnienv_call_nonvirtual_object_method'.
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_call_void_method_a'.
[Mono] Probing 'java_interop_jnienv_call_void_method_a'.
[Mono] Found as 'java_interop_jnienv_call_void_method_a'.
[Mono] Assembly Ref addref Xamarin.Android.Support.Design[0x7cf85210] -> Xamarin.Android.Support.Core.UI[0x7ce7c4a8]: 4
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_new_local_ref'.
[Mono] Probing 'java_interop_jnienv_new_local_ref'.
[Mono] Found as 'java_interop_jnienv_new_local_ref'.
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_call_boolean_method_a'.
[Mono] Probing 'java_interop_jnienv_call_boolean_method_a'.
[Mono] Found as 'java_interop_jnienv_call_boolean_method_a'.
[Adreno-EGL] <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build:  ()
[Adreno-EGL] OpenGL ES Shader Compiler Version: E031.24.00.07
[Adreno-EGL] Build Date: 01/22/14 Wed
[Adreno-EGL] Local Branch: base_au149_adreno_au169_patches
[Adreno-EGL] Remote Branch: 
[Adreno-EGL] Local Patches: 
[Adreno-EGL] Reconstruct Branch: 
[OpenGLRenderer] Enabling debug mode 0
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_call_int_method'.
[Mono] Probing 'java_interop_jnienv_call_int_method'.
[Mono] Found as 'java_interop_jnienv_call_int_method'.
[Mono] Assembly Ref addref Xamarin.Android.Support.v7.AppCompat[0x7d0e4ac0] -> Xamarin.Android.Support.Compat[0x7bbff618]: 4
[dalvikvm-heap] Grow heap (frag case) to 43.690MB for 14449048-byte allocation
[RecyclerView] No adapter attached; skipping layout
[RecyclerView] No adapter attached; skipping layout
[RecyclerView] No adapter attached; skipping layout
[RecyclerView] No adapter attached; skipping layout
[Mono] GC_TAR_BRIDGE bridges 24 objects 34 opaque 8 colors 24 colors-bridged 24 colors-visible 24 xref 6 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.05ms tarjan 0.10ms scc-setup 0.05ms gather-xref 0.00ms xref-setup 0.00ms cleanup 0.04ms
[Mono] GC_BRIDGE: Complete, was running for 25.34ms
[Mono] GC_MAJOR_SWEEP: major size: 784K in use: 199K
[Mono] GC_MAJOR: (user request) time 3.53ms, stw 3.72ms los size: 1024K in use: 8K
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_call_void_method'.
[Mono] Probing 'java_interop_jnienv_call_void_method'.
[Mono] Found as 'java_interop_jnienv_call_void_method'.
[Mono] Assembly Ref addref Xamarin.Android.Support.Fragment[0x7cfeb058] -> Xamarin.Android.Support.Core.UI[0x7ce7c4a8]: 5
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_get_field_id'.
[Mono] Probing 'java_interop_jnienv_get_field_id'.
[Mono] Found as 'java_interop_jnienv_get_field_id'.
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_get_int_field'.
[Mono] Probing 'java_interop_jnienv_get_int_field'.
[Mono] Found as 'java_interop_jnienv_get_int_field'.
[Mono] Assembly Ref addref Xamarin.Android.Support.v7.RecyclerView[0x7d4d3508] -> Xamarin.Android.Support.Core.UI[0x7ce7c4a8]: 6
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_get_object_array_element'.
[Mono] Probing 'java_interop_jnienv_get_object_array_element'.
[Mono] Found as 'java_interop_jnienv_get_object_array_element'.
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_set_boolean_field'.
[Mono] Probing 'java_interop_jnienv_set_boolean_field'.
[Mono] Found as 'java_interop_jnienv_set_boolean_field'.
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_set_int_field'.
[Mono] Probing 'java_interop_jnienv_set_int_field'.
[Mono] Found as 'java_interop_jnienv_set_int_field'.
Thread started: <Thread Pool> #2
Thread started: <Thread Pool> #3
[Mono] [0x853813e8] worker starting
Thread started: <Thread Pool> #4
Thread started: <Thread Pool> #5
[Mono] [0x85e6fb88] worker starting
[Mono] [0x85e6ffd8] worker starting
Thread started: <Thread Pool> #6
[Mono] [0x85e7bcf8] worker starting
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_get_static_field_id'.
[Mono] Probing 'java_interop_jnienv_get_static_field_id'.
[Mono] Found as 'java_interop_jnienv_get_static_field_id'.
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_get_static_object_field'.
[Mono] Probing 'java_interop_jnienv_get_static_object_field'.
[Mono] Found as 'java_interop_jnienv_get_static_object_field'.
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_call_nonvirtual_boolean_method_a'.
[Mono] Probing 'java_interop_jnienv_call_nonvirtual_boolean_method_a'.
[Mono] Found as 'java_interop_jnienv_call_nonvirtual_boolean_method_a'.
[Mono] [0x85e6ffd8] hill climbing, change max number of threads 4
[Choreographer] Skipped 34 frames!  The application may be doing too much work on its main thread.
[Mono] [0x85e6ffd8] hill climbing, change max number of threads 5
Thread started: <Thread Pool> #7
Thread started: <Thread Pool> #8
[Mono] [0x85de0cb8] worker starting
[Mono] [0x85e19438] worker starting
[dalvikvm-heap] Clamp target GC heap from 134.009MB to 128.000MB
[dalvikvm-heap] Clamp target GC heap from 138.888MB to 128.000MB
[dalvikvm-heap] Forcing collection of SoftReferences for 1575952-byte allocation
[dalvikvm-heap] Clamp target GC heap from 142.888MB to 128.000MB
[dalvikvm-heap] Out of memory on a 1575952-byte allocation.
[skia] --- allocation failed for scaled bitmap
[dalvikvm-heap] Clamp target GC heap from 142.888MB to 128.000MB
[dalvikvm-heap] Forcing collection of SoftReferences for 921616-byte allocation
[dalvikvm-heap] Clamp target GC heap from 142.888MB to 128.000MB
[dalvikvm-heap] Out of memory on a 921616-byte allocation.
[skia] --- allocation failed for scaled bitmap
[Mono] Image addref System.Runtime.Serialization[0x82d6fad0] -> System.Runtime.Serialization.dll[0x82d6ece8]: 2
[Mono] Prepared to set up assembly 'System.Runtime.Serialization' (System.Runtime.Serialization.dll)
[Mono] Assembly System.Runtime.Serialization[0x82d6fad0] added to domain RootDomain, ref_count=1
[Mono] AOT: image 'System.Runtime.Serialization.dll.so' not found: dlopen failed: library "/data/app-lib/com.companyname.peaceapp.peaceapp-115/libaot-System.Runtime.Serialization.dll.so" not found
[Mono] AOT: image '/usr/local/lib/mono/aot-cache/arm/System.Runtime.Serialization.dll.so' not found: dlopen failed: library "/data/app-lib/com.companyname.peaceapp.peaceapp-115/libaot-System.Runtime.Serialization.dll.so" not found
[Mono] Config attempting to parse: 'System.Runtime.Serialization.dll.config'.
[Mono] Config attempting to parse: '/usr/local/etc/mono/assemblies/System.Runtime.Serialization/System.Runtime.Serialization.config'.
[Mono] Assembly Ref addref Mono.Android[0x7d63cb60] -> System.Runtime.Serialization[0x82d6fad0]: 2
[Mono] Assembly Ref addref System.Runtime.Serialization[0x82d6fad0] -> mscorlib[0x72798a08]: 31
Loaded assembly: System.Runtime.Serialization.dll [External]
Thread finished: <Thread Pool> #5
[Mono] [0x85e6ffd8] worker finishing

【问题讨论】：

  • java heap size in my application to 1G ?没有这样的堆大小设置...
  • @SushiHangover，有。在我的 Visual Studio 项目解决方案中。我正在关注其他相关问题，我发现了。
  • 您必须设置 Xamarin build 进程的 Java 分区的堆大小......
  • @SushiHangover，没错。很抱歉没有说得更清楚。顺便问一下，你对我的问题有什么想法吗？在这里住了好几天

标签： android memory xamarin crash xamarin.android


【解决方案1】：

您可以在清单中或通过 Application 子类上的属性请求 LargeHeap

清单（应用程序部分）

android:largeHeap

应用子类属性：

[Application(LargeHeap = true)]
public class XamarinAndroidApp : Application
{
   ~~~~
}

这只是一个请求，根据设备的不同，您可能会或可能不会获得增加的 Java/Dalvik 堆，并且您的应用不应依赖于获得增加的堆大小。

大多数应用不应该需要这个，而是应该专注于减少整体内存使用以提高性能。启用此功能也不能保证可用内存的固定增加，因为某些设备受到其总可用内存的限制。

正如您的错误所示，您的 Java 堆在该设备上被限制为 128MB，并且堆大小适中，因为它们在较旧的低端设备和较新的高端设备上的范围可以低至 16MB高达 512MB（在某些设备上甚至更多）。但请注意，每个设备的堆大小不是可变的，并且是硬连线的 (/system/build.prop)，除了让您的应用请求 LargeHeap 之外，您无法控制它。

真正的解决方案包括：

  • 确保您已经分析了应用的分配并且没有泄漏内存
  • 您没有通过隐藏或不显示的Fragment、View 等方式持有对位图的引用，从而无法收集和释放它们
  • 您正在使用位图缓存（即LruCache）来管理在任何给定时间在内存中保存了多少Bitmaps
  • 实际保存在内存中的位图的大小适合设备的分辨率，即：
    • 动态调整设备上的内容大小并缓存结果
    • 通过您从中请求它们的 Web 服务动态地进行

【讨论】：

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