获取此异常会强制 android 应用程序在启动时崩溃

Question

11-23 10:38:04.430 2095-2095/? I/art: Not late-enabling -Xcheck:jni (already on)
11-23 10:38:04.430 2095-2095/? I/art: Late-enabling JIT
11-23 10:38:04.433 2095-2095/? I/art: JIT created with code_cache_capacity=2MB compile_threshold=1000
11-23 10:38:04.830 2095-2095/com.example.somanshusrivastava.carpiko W/System: ClassLoader referenced unknown path: /data/app/com.example.somanshusrivastava.carpiko-2/lib/x86
11-23 10:38:05.697 2095-2106/com.example.somanshusrivastava.carpiko I/art: Background partial concurrent mark sweep GC freed 96(3KB) AllocSpace objects, 0(0B) LOS objects, 7% free, 50MB/54MB, paused 2.581ms total 140.616ms
11-23 10:38:05.812 2095-2095/com.example.somanshusrivastava.carpiko I/art: Starting a blocking GC Alloc
11-23 10:38:05.812 2095-2095/com.example.somanshusrivastava.carpiko I/art: Starting a blocking GC Alloc
11-23 10:38:05.827 2095-2095/com.example.somanshusrivastava.carpiko I/art: Alloc sticky concurrent mark sweep GC freed 79(11KB) AllocSpace objects, 0(0B) LOS objects, 7% free, 50MB/54MB, paused 5.901ms total 13.614ms
11-23 10:38:05.836 2095-2095/com.example.somanshusrivastava.carpiko I/art: Starting a blocking GC Alloc
11-23 10:38:05.850 2095-2095/com.example.somanshusrivastava.carpiko I/art: Alloc partial concurrent mark sweep GC freed 23(1008B) AllocSpace objects, 0(0B) LOS objects, 7% free, 50MB/54MB, paused 2.153ms total 10.247ms
11-23 10:38:05.853 2095-2095/com.example.somanshusrivastava.carpiko I/art: Starting a blocking GC Alloc
11-23 10:38:05.867 2095-2095/com.example.somanshusrivastava.carpiko I/art: Alloc concurrent mark sweep GC freed 15(12KB) AllocSpace objects, 0(0B) LOS objects, 7% free, 50MB/54MB, paused 1.431ms total 13.789ms
11-23 10:38:05.868 2095-2095/com.example.somanshusrivastava.carpiko I/art: Forcing collection of SoftReferences for 49MB allocation
11-23 10:38:05.869 2095-2095/com.example.somanshusrivastava.carpiko I/art: Starting a blocking GC Alloc
11-23 10:38:05.881 2095-2095/com.example.somanshusrivastava.carpiko I/art: Alloc concurrent mark sweep GC freed 11(344B) AllocSpace objects, 0(0B) LOS objects, 7% free, 50MB/54MB, paused 1.407ms total 11.758ms
11-23 10:38:05.882 2095-2095/com.example.somanshusrivastava.carpiko W/art: Throwing OutOfMemoryError "Failed to allocate a 51750048 byte allocation with 4194304 free bytes and 13MB until OOM"
11-23 10:38:05.882 2095-2095/com.example.somanshusrivastava.carpiko I/art: Starting a blocking GC Alloc
11-23 10:38:05.882 2095-2095/com.example.somanshusrivastava.carpiko I/art: Starting a blocking GC Alloc
11-23 10:38:05.892 2095-2095/com.example.somanshusrivastava.carpiko I/art: Alloc sticky concurrent mark sweep GC freed 3(608B) AllocSpace objects, 0(0B) LOS objects, 7% free, 50MB/54MB, paused 1.389ms total 8.964ms
11-23 10:38:05.894 2095-2095/com.example.somanshusrivastava.carpiko I/art: Starting a blocking GC Alloc
11-23 10:38:05.903 2095-2095/com.example.somanshusrivastava.carpiko I/art: Alloc partial concurrent mark sweep GC freed 6(192B) AllocSpace objects, 0(0B) LOS objects, 7% free, 50MB/54MB, paused 1.387ms total 8.867ms
11-23 10:38:05.904 2095-2095/com.example.somanshusrivastava.carpiko I/art: Starting a blocking GC Alloc
11-23 10:38:05.916 2095-2095/com.example.somanshusrivastava.carpiko I/art: Alloc concurrent mark sweep GC freed 3(96B) AllocSpace objects, 0(0B) LOS objects, 7% free, 50MB/54MB, paused 1.416ms total 10.922ms
11-23 10:38:05.917 2095-2095/com.example.somanshusrivastava.carpiko I/art: Forcing collection of SoftReferences for 49MB allocation
11-23 10:38:05.917 2095-2095/com.example.somanshusrivastava.carpiko I/art: Starting a blocking GC Alloc
11-23 10:38:05.928 2095-2095/com.example.somanshusrivastava.carpiko I/art: Alloc concurrent mark sweep GC freed 3(96B) AllocSpace objects, 0(0B) LOS objects, 7% free, 50MB/54MB, paused 1.350ms total 10.018ms
11-23 10:38:05.929 2095-2095/com.example.somanshusrivastava.carpiko W/art: Throwing OutOfMemoryError "Failed to allocate a 51750048 byte allocation with 4194304 free bytes and 13MB until OOM"
11-23 10:38:05.929 2095-2095/com.example.somanshusrivastava.carpiko D/skia: --- allocation failed for scaled bitmap
11-23 10:38:05.930 2095-2095/com.example.somanshusrivastava.carpiko D/AndroidRuntime: Shutting down VM
11-23 10:38:05.930 2095-2095/com.example.somanshusrivastava.carpiko E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                      Process: com.example.somanshusrivastava.carpiko, PID: 2095
                                                                                      java.lang.OutOfMemoryError: Failed to allocate a 51750048 byte allocation with 4194304 free bytes and 13MB until OOM
                                                                                          at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
                                                                                          at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
                                                                                          at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:609)
                                                                                          at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:444)
                                                                                          at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:1080)
                                                                                          at android.content.res.Resources.loadDrawableForCookie(Resources.java:2635)
                                                                                          at android.content.res.Resources.loadDrawable(Resources.java:2540)
                                                                                          at android.content.res.TypedArray.getDrawable(TypedArray.java:870)
                                                                                          at android.widget.ImageView.(ImageView.java:152)
                                                                                          at android.widget.ImageView.(ImageView.java:140)
                                                                                          at android.support.v7.widget.AppCompatImageView.(AppCompatImageView.java:58)
                                                                                          at android.support.v7.widget.AppCompatImageView.(AppCompatImageView.java:54)
                                                                                          at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:95)
                                                                                          at android.support.v7.app.AppCompatDelegateImplV7.createView(AppCompatDelegateImplV7.java:938)
                                                                                          at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:992)
                                                                                          at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44)
                                                                                          at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:746)
                                                                                          at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
                                                                                          at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
                                                                                          at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
                                                                                          at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
                                                                                          at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
                                                                                          at android.view.LayoutInflater.parseInclude(LayoutInflater.java:971)
                                                                                          at android.view.LayoutInflater.rInflate(LayoutInflater.java:831)
                                                                                          at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
                                                                                          at android.view.LayoutInflater.parseInclude(LayoutInflater.java:971)
                                                                                          at android.view.LayoutInflater.rInflate(LayoutInflater.java:831)
                                                                                          at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
                                                                                          at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
                                                                                          at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
                                                                                          at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
                                                                                          at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)
                                                                                          at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
                                                                                          at com.example.somanshusrivastava.carpiko.MainActivity.onCreate(MainActivity.java:24)
                                                                                          at android.app.Activity.performCreate(Activity.java:6237)
                                                                                          at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
                                                                                          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                                                                                          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                                          at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                                          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                                          at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                          at android.os.Looper.loop(Looper.java:148)
                                                                                          at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                                          at java.lang.reflect.Method.invoke(Native Method)
                                                                                          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
11-23 10:38:07.560 2095-2102/com.example.somanshusrivastava.carpiko W/art: Suspending all threads took: 13.233ms
11-23 10:38:09.537 2095-2102/com.example.somanshusrivastava.carpiko W/art: Suspending all threads took: 9.664ms
11-23 10:38:11.140 2095-2095/? I/Process: Sending signal. PID: 2095 SIG: 9

, my app unexpectedly closes and this is the error I get.每当我尝试运行，我的应用程序都会意外关闭，这是我得到的错误。 这是生成的 logcat。 它显示了 FatalException 和 MemoryException。 是 AVD 错误还是代码错误？ 请帮忙。

Answer 1

你需要了解Bitmap和内存的概念

假设您想在屏幕上显示您刚用相机拍摄的图像。 为此所需的总内存使用以下公式计算：memory_needed_in_bytes = 4 * image_width * image_height;

为什么是4？ 嗯，最常见/推荐的位图配置是 ARGB_8888。 这意味着对于我们绘制的每个像素，我们需要在内存中为 alpha、红色、贪婪和蓝色通道保留 8 位（1 个字节），以便正确显示它。 有替代方案，例如 RGB_565 配置需要的内存是 ARGB_8888 的一半，但会失去透明度和颜色精度（同时可能会添加绿色调）。

假设您有一台配备全高清屏幕和 12 MP 摄像头的全新设备。 您刚刚拍摄的图片大小为 4000x3000 像素，显示它所需的总内存为：4 字节 * 4000 * 3000 = 48 MB

48 MB 的 RAM 仅用于单个图像！？ 好多啊！

现在让我们考虑屏幕分辨率。 您试图在具有 1920x1080 像素的屏幕上显示 4000x3000 图像，在最坏的情况下（全屏显示图像），您不应分配超过 4 * 1920 * 1080 = 8.3 MB 的内存。

始终遵循 Android 编程技巧以有效地显示位图：

测量显示图像的视图。相应地缩放/裁剪大图像。 只显示可以显示的内容。

Answer 2

抛出的异常称为OutOfMemoryError 。 当（显然）内存不足时会发生错误！ 这是它的文档：

当使用可用平台资源无法满足内存请求时抛出。 此类请求可由正在运行的应用程序或 VM 的内部功能发出。

更多信息在这里：

http://developer.android.com/reference/java/lang/OutOfMemoryError.html

因此，您应该为模拟器分配更多内存。 但我认为主要原因是您的应用程序使用了太多内存。 你用的是超大图吗？

Answer 3

机器人：大堆=“真”

你不应该使用它，这不是解决问题的方法，这是一个临时的问题修复方法。 这样做是增加模拟器/手机的内存，它会工作，但最终它会再次崩溃，因为你没有解决内存问题

Answer 4

将此ligne添加到您的清单文件中：

 android:largeHeap="true"

Answer 5

如果您使用 RXJAVA 并且只观察“单一”类型的可观察对象，那么在您发出大量图像或任何类型的数据集时很容易发生这种情况：

在 .subscribe 之前尝试使用 toFlowable

https://medium.com/@gabrieldemattosleon/fundamentals-of-rxjava-with-kotlin-for-absolute-beginners-3d811350b701