未能分配 27394783 字节分配，其中 15063472 空闲字节和 14MB 直到 OOM 异常

Question

场景

我正在开发 android 应用程序，它下载加密的视频文件，将其保存在内存中，然后当用户从 android 应用程序单击该文件的播放按钮时解密它。解密后播放该视频。

问题

应用程序在大多数设备上都能正常运行。但是在 Redmi note 4 中（根据我对 3 个不同的 Redmi note 4 的测试）它给出了例外

Throwing OutOfMemoryError "Failed to allocate a 27394783 byte allocation with 15063472 free bytes and 14MB until OOM

Android Menifest.xml

    android:name=".receiver.ConnectivityListener"
    android:allowBackup="true"
    android:hardwareAccelerated="false"
    android:largeHeap="true"
    android:supportsRtl="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/MyMaterialTheme"
    android:usesCleartextTraffic="true"

在 build.gradle 中

dexOptions {
    incremental true
    javaMaxHeapSize "4g"
    preDexLibraries true
    dexInProcess = true
}

日志猫

2020-03-21 15:23:40.733 19593-19699/com.ehiddenbrain.prod I/art: Forcing collection of SoftReferences for 26MB allocation
2020-03-21 15:23:40.733 19593-19699/com.ehiddenbrain.prod I/art: Starting a blocking GC Alloc
2020-03-21 15:23:40.767 19593-19699/com.ehiddenbrain.prod I/art: Clamp target GC heap from 513MB to 512MB
2020-03-21 15:23:40.767 19593-19699/com.ehiddenbrain.prod I/art: Alloc concurrent mark sweep GC freed 3(72B) AllocSpace objects, 0(0B) LOS objects, 2% free, 497MB/512MB, paused 435us total 33.194ms
2020-03-21 15:23:40.767 19593-19699/com.ehiddenbrain.prod W/art: Throwing OutOfMemoryError "Failed to allocate a 27394783 byte allocation with 15063472 free bytes and 14MB until OOM"


2020-03-21 15:23:40.778 19593-19699/com.ehiddenbrain.prod E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #9
Process: com.ehiddenbrain.prod, PID: 19593
java.lang.RuntimeException: An error occurred while executing doInBackground()
    at android.os.AsyncTask$3.done(AsyncTask.java:318)
    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
    at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
    at java.lang.Thread.run(Thread.java:760)
 Caused by: java.lang.OutOfMemoryError: Failed to allocate a 27394783 byte allocation with 15063472 free bytes and 14MB until OOM
    at com.android.org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineDoFinal(BaseBlockCipher.java:1112)
    at javax.crypto.Cipher.doFinal(Cipher.java:2056)
    at com.example.ehiddenbrain_v03.utility.Decoder.decryptVideo(Decoder.java:56)
    at com.example.ehiddenbrain_v03.background.DecoderBackgroundTask.doInBackground(DecoderBackgroundTask.java:66)
    at com.example.ehiddenbrain_v03.background.DecoderBackgroundTask.doInBackground(DecoderBackgroundTask.java:26)
    at android.os.AsyncTask$2.call(AsyncTask.java:304)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) 
    at java.lang.Thread.run(Thread.java:760) 
2020-03-21 15:23:40.779 19593-19699/com.ehiddenbrain.prod W/AndroidRuntime: finished raiseRlimit, rlim_cur:4096  rlim_max:4096
2020-03-21 15:23:40.945 19593-19696/com.ehiddenbrain.prod V/FA: Recording user engagement, ms: 4696
2020-03-21 15:23:40.947 19593-19696/com.ehiddenbrain.prod V/FA: Activity paused, time: 240603587

如果有人知道这个问题，请帮助我... 谢谢！！！

Answer 1

在我的解决方案中，我将ByteArrayOutputStream（内存）更改为FileOutputStrem（磁盘）。效果很好！

val fis = ByteArrayInputStream(fileData)
val cin = CipherInputStream(fis, cipher)
val fos = FileOutputStream(fileToSave)

val b = ByteArray(128)
var numberOfBytesRead: Int
while (cin.read(b).also { numberOfBytesRead = it } >= 0) {
    fos.write(b, 0, numberOfBytesRead)
}