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My Android app gives me this error when I am converting a bitmap to WEBP format:

 #00 pc 00000000004125c4 /system/lib/libskia.so
 #01 pc 000000000042e350 /system/lib/libskia.so
 #02 pc 000000000042db78 /system/lib/libskia.so
 #03 pc 000000000042dc60 /system/lib/libskia.so (WebPPictureImportRGBA+36)
 #04 pc 00000000003a1fd0 /system/lib/libskia.so (_ZN18SkWEBPImageEncoder8onEncodeEP9SkWStreamRK8SkBitmapi+444)
 #05 pc 00000000000a216f /system/lib/libandroid_runtime.so
 #06 pc 0000000001aabea3 /system/framework/arm/boot-framework.oat (android.graphics.Bitmap.nativeCompress+158)
 #07 pc 0000000001aad39b /system/framework/arm/boot-framework.oat (android.graphics.Bitmap.compress+230)
 #08 pc 00000000000a9e41 /system/lib/libart.so (art_quick_invoke_stub_internal+64)
 #09 pc 00000000004087e1 /system/lib/libart.so (art_quick_invoke_stub+232)
 #10 pc 00000000000b1115 /system/lib/libart.so (_ZN3art9ArtMethod6InvokeEPNS_6ThreadEPjjPNS_6JValueEPKc+136)
 #11 pc 00000000001ef3fd /system/lib/libart.so (_ZN3art11interpreter34ArtInterpreterToCompiledCodeBridgeEPNS_6ThreadEPNS_9ArtMethodEPKNS_7DexFile8CodeItemEPNS_11ShadowFrameEPNS_6JValueE+200)
 #12 pc 00000000001e99ad /system/lib/libart.so (_ZN3art11interpreter6DoCallILb0ELb0EEEbPNS_9ArtMethodEPNS_6ThreadERNS_11ShadowFrameEPKNS_11InstructionEtPNS_6JValueE+492)
 #13 pc 0000000000402bb3 /system/lib/libart.so (MterpInvokeVirtualQuick+322)
 #14 pc 00000000000a0a14 /system/lib/libart.so (ExecuteMterpImpl+29972)
 #15 pc 00000000001cc463 /system/lib/libart.so (_ZN3art11interpreterL7ExecuteEPNS_6ThreadEPKNS_7DexFile8CodeItemERNS_11ShadowFrameENS_6JValueEb+290)
 #16 pc 00000000001d0fcb /system/lib/libart.so (_ZN3art11interpreter33ArtInterpreterToInterpreterBridgeEPNS_6ThreadEPKNS_7DexFile8CodeItemEPNS_11ShadowFrameEPNS_6JValueE+114)
 #17 pc 00000000001e9993 /system/lib/libart.so (_ZN3art11interpreter6DoCallILb0ELb0EEEbPNS_9ArtMethodEPNS_6ThreadERNS_11ShadowFrameEPKNS_11InstructionEtPNS_6JValueE+466)
 #18 pc 0000000000402bb3 /system/lib/libart.so (MterpInvokeVirtualQuick+322)
 #19 pc 00000000000a0a14 /system/lib/libart.so (ExecuteMterpImpl+29972)
 #20 pc 00000000001cc463 /system/lib/libart.so (_ZN3art11interpreterL7ExecuteEPNS_6ThreadEPKNS_7DexFile8CodeItemERNS_11ShadowFrameENS_6JValueEb+290)
 #21 pc 00000000001d0fcb /system/lib/libart.so (_ZN3art11interpreter33ArtInterpreterToInterpreterBridgeEPNS_6ThreadEPKNS_7DexFile8CodeItemEPNS_11ShadowFrameEPNS_6JValueE+114)
 #22 pc 00000000001e9993 /system/lib/libart.so (_ZN3art11interpreter6DoCallILb0ELb0EEEbPNS_9ArtMethodEPNS_6ThreadERNS_11ShadowFrameEPKNS_11InstructionEtPNS_6JValueE+466)
 #23 pc 0000000000402bb3 /system/lib/libart.so (MterpInvokeVirtualQuick+322)
 #24 pc 00000000000a0a14 /system/lib/libart.so (ExecuteMterpImpl+29972)
 #25 pc 00000000001cc463 /system/lib/libart.so (_ZN3art11interpreterL7ExecuteEPNS_6ThreadEPKNS_7DexFile8CodeItemERNS_11ShadowFrameENS_6JValueEb+290)
 #26 pc 00000000001d0f35 /system/lib/libart.so (_ZN3art11interpreter30EnterInterpreterFromEntryPointEPNS_6ThreadEPKNS_7DexFile8CodeItemEPNS_11ShadowFrameE+92)
 #27 pc 00000000003f7bb3 /system/lib/libart.so (artQuickToInterpreterBridge+706)
 #28 pc 00000000000ae893 /system/lib/libart.so (art_quick_to_interpreter_bridge+34)
 #29 pc 000000000208fc09 /system/framework/arm/boot-framework.oat (android.view.View.performClick+276)
 #30 pc 0000000002109f95 /system/framework/arm/boot-framework.oat (android.view.View$PerformClick.run+40)
 #31 pc 000000000182fbe5 /system/framework/arm/boot-framework.oat (android.os.Handler.handleCallback+48)
 #32 pc 000000000182fc43 /system/framework/arm/boot-framework.oat (android.os.Handler.dispatchMessage+54)
 #33 pc 0000000001e24e39 /system/framework/arm/boot-framework.oat (android.os.Looper.loop+1948)
 #34 pc 00000000018445f3 /system/framework/arm/boot-framework.oat (android.app.ActivityThread.main+814)
 #35 pc 00000000000a9e41 /system/lib/libart.so (art_quick_invoke_stub_internal+64)
 #36 pc 00000000004088e9 /system/lib/libart.so (art_quick_invoke_static_stub+228)
 #37 pc 00000000000b113f /system/lib/libart.so (_ZN3art9ArtMethod6InvokeEPNS_6ThreadEPjjPNS_6JValueEPKc+178)
 #38 pc 0000000000318d21 /system/lib/libart.so (_ZN3artL18InvokeWithArgArrayERKNS_33ScopedObjectAccessAlreadyRunnableEPNS_9ArtMethodEPNS_8ArgArrayEPNS_6JValueEPKc+56)
 #39 pc 000000000031a0b3 /system/lib/libart.so (_ZN3art12InvokeMethodERKNS_33ScopedObjectAccessAlreadyRunnableEP8_jobjectS4_S4_j+766)
 #40 pc 00000000002c12d5 /system/lib/libart.so (_ZN3artL13Method_invokeEP7_JNIEnvP8_jobjectS3_S3_+40)
 #41 pc 00000000005ae931 /system/framework/arm/boot-core-oj.oat (java.lang.reflect.Method.invoke+116)
 #42 pc 000000000236cf89 /system/framework/arm/boot-framework.oat (com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run+100)
 #43 pc 000000000236e3df /system/framework/arm/boot-framework.oat (com.android.internal.os.ZygoteInit.main+1978)
 #44 pc 00000000000a9e41 /system/lib/libart.so (art_quick_invoke_stub_internal+64)
 #45 pc 00000000004088e9 /system/lib/libart.so (art_quick_invoke_static_stub+228)
 #46 pc 00000000000b113f /system/lib/libart.so (_ZN3art9ArtMethod6InvokeEPNS_6ThreadEPjjPNS_6JValueEPKc+178)
 #47 pc 0000000000318d21 /system/lib/libart.so (_ZN3artL18InvokeWithArgArrayERKNS_33ScopedObjectAccessAlreadyRunnableEPNS_9ArtMethodEPNS_8ArgArrayEPNS_6JValueEPKc+56)
 #48 pc 0000000000318b33 /system/lib/libart.so (_ZN3art17InvokeWithVarArgsERKNS_33ScopedObjectAccessAlreadyRunnableEP8_jobjectP10_jmethodIDSt9__va_list+266)
 #49 pc 000000000027b61f /system/lib/libart.so (_ZN3art3JNI21CallStaticVoidMethodVEP7_JNIEnvP7_jclassP10_jmethodIDSt9__va_list+426)
 #50 pc 000000000006837d /system/lib/libandroid_runtime.so
 #51 pc 0000000000069c63 /system/lib/libandroid_runtime.so (_ZN7android14AndroidRuntime5startEPKcRKNS_6VectorINS_7String8EEEb+498)
 #52 pc 000000000000199f /system/bin/app_process32
 #53 pc 0000000000016d8d /system/lib/libc.so (__libc_init+48)
 #54 pc 00000000000015bc /system/bin/app_process32

I don't know exactly where that error occurs but my guess is when I try to compress a bitmap to the WEBP format in here:

public String saveImage(String id, Bitmap bitmap) 
 if(bitmap != null) 
 File folder = new File(getFilesDir() + "/packs", id);
 if (!folder.exists())
 folder.mkdirs();
 String stickerName = "sticker" + String.valueOf(TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis())) + ".webp";
 File filename = new File(folder, stickerName);
 try 
 if (!filename.exists())
 filename.createNewFile();
 FileOutputStream out = new FileOutputStream(filename);
 bitmap.compress(Bitmap.CompressFormat.WEBP, 100, out);
 out.close();
 catch (Exception e) 
 e.printStackTrace();
 
 return stickerName;
 else 
 return null;
 

The bitmap is created inside a custom view of mine and than saved as WEBP, but it gives me an error every time I try. As I said I don't know how to debug this error message so if I am totally wrong please say.

Thanks in advance!

So I ended up using libwebp instead of Bitmap.compress(Bitmap.CompressFormat.WEBP, 100, out); and it now works fine. Here is a tutorial on how to use libwebp http://masashi-k.blogspot.com/2014/02/webp-in-android.html.

EDIT: It ended up giving me the same error. I will just try the solution you posted.

Add Android Compressor Library to your build.gradle and copy and paste this function (if you have a Bitmap)

public static void saveBitmap(String folder, String imageName, Bitmap bitmap, Context context) throws IOException 
 File temp = new File(folder, "temp_" + imageName);

 try (OutputStream stream = new FileOutputStream(temp)) 
 bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
 

 new Compressor(context)
 .setQuality(90)
 .setCompressFormat(Bitmap.CompressFormat.WEBP)
 .setDestinationDirectoryPath(folder) // Saving in the same folder temp file is at
 .compressToFile(temp, imageName); // Takes the temp file and creates a new one with the name passed as second argument

 temp.delete(); // Deleting temp file

 

If you are wondering why i'm saving a temporary PNG file before saving the desired WEBP, it's because that library doesn't take a Bitmap as argument, it only works with File.

The library logs an error saying "the file should be a JPEG" but it is working fine so far anyway, the PNG alpha channel is being kept in the WEBP so i'm ignoring that error.