应用程序在使用chaquopy时在设备中崩溃，但在模拟器中不会崩溃

Question

我在android studio中使用chaquopy创建了一个人脸检测。当我运行应用程序到模拟器，它是完美的工作。但是当我对着手机笑的时候，它死机了。在Run中显示

I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Swap behavior 1
I/Toast: Show toast from OpPackageName:com.example.chaquopy, PackageName:com.example.chaquopy
V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@57230c5
I/Adreno: BLTLIB: Semaphore Timeout, disabling MT
I/Adreno: BLTLIB: Semaphore Timeout count 1
I/Adreno: BLTLIB: Semaphore Timeout count 2
I/Adreno: BLTLIB: Semaphore Timeout count 3
I/Adreno: BLTLIB: Semaphore Timeout count 4
I/Adreno: BLTLIB: Semaphore Timeout count 5
I/Adreno: BLTLIB: Semaphore Timeout count 6
I/Adreno: BLTLIB: Semaphore Timeout count 7
I/art: Waiting for a blocking GC Alloc
I/art: Starting a blocking GC Alloc
Starting a blocking GC Alloc
I/art: Alloc partial concurrent mark sweep GC freed 220(9KB) AllocSpace objects, 1(480KB) LOS objects, 8% free, 171MB/187MB, paused 262us total 14.558ms
Starting a blocking GC Alloc
I/art: Starting a blocking GC Alloc
I/art: Alloc concurrent mark sweep GC freed 27(752B) AllocSpace objects, 0(0B) LOS objects, 8% free, 171MB/187MB, paused 237us total 25.550ms
Forcing collection of SoftReferences for 35MB allocation
Starting a blocking GC Alloc
I/art: Alloc concurrent mark sweep GC freed 2(48B) AllocSpace objects, 0(0B) LOS objects, 8% free, 171MB/187MB, paused 230us total 24.816ms
W/art: Throwing OutOfMemoryError "Failed to allocate a 36742016 byte allocation with 16777216 free bytes and 20MB until OOM"
I/art: Starting a blocking GC Alloc
Starting a blocking GC Alloc
I/art: Starting a blocking GC Alloc
I/art: Alloc partial concurrent mark sweep GC freed 4(96B) AllocSpace objects, 0(0B) LOS objects, 8% free, 171MB/187MB, paused 430us total 22.384ms
Starting a blocking GC Alloc
I/art: Alloc concurrent mark sweep GC freed 2(48B) AllocSpace objects, 0(0B) LOS objects, 8% free, 171MB/187MB, paused 333us total 35.743ms
Forcing collection of SoftReferences for 35MB allocation
Starting a blocking GC Alloc
I/art: Alloc concurrent mark sweep GC freed 3(72B) AllocSpace objects, 0(0B) LOS objects, 8% free, 171MB/187MB, paused 249us total 28.176ms
Starting a blocking GC HomogeneousSpaceCompact
I/art: HomogeneousSpaceCompact marksweep + semispace GC freed 0(0B) AllocSpace objects, 0(0B) LOS objects, 8% free, 171MB/187MB, paused 29.551ms total 29.551ms
W/art: Throwing OutOfMemoryError "Failed to allocate a 36742016 byte allocation with 16777216 free bytes and 20MB until OOM"
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.chaquopy, PID: 32703
java.lang.OutOfMemoryError: Failed to allocate a 36742016 byte allocation with 16777216 free bytes and 20MB until OOM
at java.lang.StringFactory.newStringFromChars(StringFactory.java:218)
at java.lang.StringFactory.newStringFromBytes(StringFactory.java:203)
at java.lang.StringFactory.newStringFromBytes(StringFactory.java:63)
at android.util.Base64.encodeToString(Base64.java:456)
at com.example.chaquopy.MainActivity.getStringImage(MainActivity.java:102)
at com.example.chaquopy.MainActivity.access$000(MainActivity.java:31)
at com.example.chaquopy.MainActivity$1.onClick(MainActivity.java:76)
at android.view.View.performClick(View.java:5619)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
at android.view.View$PerformClick.run(View.java:22298)
at android.os.Handler.handleCallback(Handler.java:754)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:165)
at android.app.ActivityThread.main(ActivityThread.java:6375)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:802)
W/AndroidRuntime: finished raiseRlimit, rlim_cur:4096  rlim_max:4096

我的代码是

Submitbtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this,"Submit Button is clicked",Toast.LENGTH_SHORT).show();
//by clicking get image from image view
bitmapDrawable = (BitmapDrawable) selectedImage.getDrawable();
bitmap = bitmapDrawable.getBitmap();
imageString = getStringImage(bitmap);
//in imageString we get encoded image
//passing the string into python script
PyObject pyObject = py.getModule("scripts");
PyObject obj = pyObject.callAttr("main", imageString);
//converted to string
String string = obj.toString();
//converted to byte array
byte data[] = android.util.Base64.decode(string,0);
//converted to bitmap
Bitmap returnBitmap = BitmapFactory.decodeByteArray(data,0,data.length);
//now set bitmap to image view
selectedImage.setImageBitmap(returnBitmap);
}
});

和

private String getStringImage(Bitmap bitmap) {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG,100,byteArrayOutputStream);
//storing in byte array
byte[] imageBytes = byteArrayOutputStream.toByteArray();
//encoding string
String encodedImage = android.util.Base64.encodeToString(imageBytes, 0);
return encodedImage;
}

在我的代码中，当用户单击提交时，imageview中的图像将被编码成字符串并发送到python模块。然后在python脚本中，在做面部检测后，它再次返回字符串，在main中我做剩下的。我能做什么?

Answer 1

这里不需要使用Base64。只需将byte[]数组直接传递给Python，并使用本FAQ中所示的方法之一在Python中接收它。

同样，当从Python返回图像时，您应该返回一个bytes对象，并使用toJava将其转换为byte[]数组，如chaquopy-matplotlib示例所示。

另外，如果你的图像是36mb的PNG格式，那么我认为这是一张高分辨率的照片，所以你可能应该使用JPG格式。