android4.4系统解决“ERRORcouldn't find native method”方法

时间：2021-05-21 09:09:23

android4.4系统解决“ERRORcouldn't find native method”方法

今天笔者在移植一个tv模块从android4.2到android4.4系统的设备上，相同的代码，相同的方法，就是执行不起来。大概方法就是上层写一个apk，调用一个静态的java库，java库载入调用JNI的库文件，这一套代码在4.2上都是好好的，正常能跑，移到4.4上编译也都没有问题，执行会出以下的问题：

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错误信息例如以下：

07-01 20:57:29.200 I/ActivityManager( 1613): START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.softwinner.cvbs/.CVBS} from pid 2139

07-01 20:57:29.320 I/ActivityManager( 1613): Start proc com.softwinner.cvbs for activity com.softwinner.cvbs/.CVBS: pid=2878 uid=10022 gids={50022}

07-01 20:57:29.420 I/PackageManager( 1613): Running dexopt on: com.softwinner.cvbs

07-01 20:57:29.540 D/dalvikvm( 2891): DexOpt: load 14ms, verify+opt 41ms, 273740 bytes

07-01 20:57:29.570 V/PhoneStatusBar( 1691): setLightsOn(true)

07-01 20:57:29.800 E/dalvikvm( 2878): ERROR: couldn't find native method

07-01 20:57:29.800 E/dalvikvm( 2878): Requested: Lsoftwinner/tv/TVDecoder;.connect:(IIII)I

07-01 20:57:29.800 E/dalvikvm( 2878): JNI posting fatal error: RegisterNatives failed for 'softwinner/tv/TVDecoder'; aborting...

07-01 20:57:29.800 I/dalvikvm( 2878): "main" prio=5 tid=1 NATIVE

07-01 20:57:29.800 I/dalvikvm( 2878):   | group="main" sCount=0 dsCount=0 obj=0x41533c90 self=0x4146c580

07-01 20:57:29.800 I/dalvikvm( 2878):   | sysTid=2878 nice=0 sched=0/0 cgrp=apps handle=1073873236

07-01 20:57:29.810 I/dalvikvm( 2878):   | state=R schedstat=( 0 0 0 ) utm=11 stm=6 core=1

07-01 20:57:29.820 I/dalvikvm( 2878):   #00  pc 000012f6  /system/lib/libcorkscrew.so (unwind_backtrace_thread+29)

07-01 20:57:29.820 I/dalvikvm( 2878):   #01  pc 000604ec  /system/lib/libdvm.so (dvmDumpNativeStack(DebugOutputTarget const*, int)+31)

07-01 20:57:29.820 I/dalvikvm( 2878):   #02  pc 000544e8  /system/lib/libdvm.so (dvmDumpThreadEx(DebugOutputTarget const*, Thread*, bool)+395)

07-01 20:57:29.820 I/dalvikvm( 2878):   #03  pc 00054556  /system/lib/libdvm.so (dvmDumpThread(Thread*, bool)+25)

07-01 20:57:29.820 I/dalvikvm( 2878):   #04  pc 00048f90  /system/lib/libdvm.so

07-01 20:57:29.820 I/dalvikvm( 2878):   #05  pc 00001fd2  /system/lib/libnativehelper.so (jniRegisterNativeMethods+81)

07-01 20:57:29.820 I/dalvikvm( 2878):   #06  pc 00000ac6  /system/lib/libtvdecoder_jni.so (JNI_OnLoad+41)

07-01 20:57:29.820 I/dalvikvm( 2878):   #07  pc 0004feba  /system/lib/libdvm.so (dvmLoadNativeCode(char const*, Object*, char**)+465)

07-01 20:57:29.820 I/dalvikvm( 2878):   #08  pc 00067590  /system/lib/libdvm.so

07-01 20:57:29.820 I/dalvikvm( 2878):   #09  pc 00026f60  /system/lib/libdvm.so

07-01 20:57:29.820 I/dalvikvm( 2878):   #10  pc 0002deec  /system/lib/libdvm.so (dvmMterpStd(Thread*)+76)

07-01 20:57:29.820 I/dalvikvm( 2878):   #11  pc 0002b598  /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)

07-01 20:57:29.820 I/dalvikvm( 2878):   #12  pc 0006041e  /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)+337)

07-01 20:57:29.820 I/dalvikvm( 2878):   #13  pc 00060442  /system/lib/libdvm.so (dvmCallMethod(Thread*, Method const*, Object*, JValue*, ...)+19)

07-01 20:57:29.820 I/dalvikvm( 2878):   #14  pc 0006ba88  /system/lib/libdvm.so (dvmInitClass+1019)

07-01 20:57:29.820 I/dalvikvm( 2878):   #15  pc 00021e5c  /system/lib/libdvm.so (dvmAsmSisterStart+412)

07-01 20:57:29.820 I/dalvikvm( 2878):   #16  pc 0002deec  /system/lib/libdvm.so (dvmMterpStd(Thread*)+76)

07-01 20:57:29.820 I/dalvikvm( 2878):   #17  pc 0002b598  /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)

07-01 20:57:29.820 I/dalvikvm( 2878):   #18  pc 00060700  /system/lib/libdvm.so (dvmInvokeMethod(Object*, Method const*, ArrayObject*, ArrayObject*, ClassObject*, bool)+391)

07-01 20:57:29.820 I/dalvikvm( 2878):   #19  pc 0006866e  /system/lib/libdvm.so

07-01 20:57:29.820 I/dalvikvm( 2878):   #20  pc 00026f60  /system/lib/libdvm.so

07-01 20:57:29.820 I/dalvikvm( 2878):   #21  pc 0002deec  /system/lib/libdvm.so (dvmMterpStd(Thread*)+76)

07-01 20:57:29.820 I/dalvikvm( 2878):   #22  pc 0002b598  /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)

07-01 20:57:29.820 I/dalvikvm( 2878):   #23  pc 0006041e  /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)+337)

07-01 20:57:29.820 I/dalvikvm( 2878):   #24  pc 00049bda  /system/lib/libdvm.so

07-01 20:57:29.820 I/dalvikvm( 2878):   #25  pc 0004ce80  /system/lib/libandroid_runtime.so

07-01 20:57:29.820 I/dalvikvm( 2878):   #26  pc 0004dba6  /system/lib/libandroid_runtime.so (android::AndroidRuntime::start(char const*, char const*)+353)

07-01 20:57:29.830 I/dalvikvm( 2878):   #27  pc 0000105a  /system/bin/app_process

07-01 20:57:29.830 I/dalvikvm( 2878):   #28  pc 0000e3e8  /system/lib/libc.so (__libc_init+47)

07-01 20:57:29.830 I/dalvikvm( 2878):   at java.lang.Runtime.nativeLoad(Native Method)

07-01 20:57:29.830 I/dalvikvm( 2878):   at java.lang.Runtime.doLoad(Runtime.java:421)

07-01 20:57:29.830 I/dalvikvm( 2878):   at java.lang.Runtime.loadLibrary(Runtime.java:362)

07-01 20:57:29.830 I/dalvikvm( 2878):   at java.lang.System.loadLibrary(System.java:526)

07-01 20:57:29.830 I/dalvikvm( 2878):   at softwinner.tv.TVDecoder.<clinit>(TVDecoder.java:11)

07-01 20:57:29.830 I/dalvikvm( 2878):   at com.softwinner.cvbs.CVBS.onCreate(CVBS.java:-1)

07-01 20:57:29.830 I/dalvikvm( 2878):   at android.app.Activity.performCreate(Activity.java:5243)

07-01 20:57:29.830 I/dalvikvm( 2878):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)

07-01 20:57:29.830 I/dalvikvm( 2878):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)

07-01 20:57:29.830 I/dalvikvm( 2878):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.j

非常悲剧，老老实实查了几遍，包引用，native名称，jin名称映射，编译这些看起来都没有问题，为什么呢？笔者也Google了一遍，还好有一些同道中人啊！都是proguard惹的祸！由于它可能会优化掉这些jni native类，在编译静态java库的时候，假设不特别指定proguard的话，会出问题，以下看看build系统的 java_library.mk文件：

ifeq ($(LOCAL_PROGUARD_ENABLED),disabled)

  LOCAL_PROGUARD_ENABLED :=

endif

ifeq ($(LOCAL_IS_STATIC_JAVA_LIBRARY),true)

# No dex; all we want are the .class files with resources.

$(common_javalib.jar) : $(java_resource_sources)

ifdef LOCAL_PROGUARD_ENABLED

$(common_javalib.jar) : $(full_classes_proguard_jar)

else

$(common_javalib.jar) : $(full_classes_jar)

endif

	@echo "target Static Jar: $(PRIVATE_MODULE) ($@)"

	$(copy-file-to-target)

ifneq ($(extra_jar_args),)

	$(add-java-resources-to-package)

endif

$(LOCAL_BUILT_MODULE): $(common_javalib.jar)

	$(copy-file-to-target)

else # !LOCAL_IS_STATIC_JAVA_LIBRARY

$(common_javalib.jar): PRIVATE_DEX_FILE := $(built_dex)

$(common_javalib.jar) : $(built_dex) $(java_resource_sources)

	@echo "target Jar: $(PRIVATE_MODULE) ($@)"

	$(create-empty-package)

	$(add-dex-to-package)

	$(add-carried-java-resources)

ifneq ($(extra_jar_args),)

	$(add-java-resources-to-package)

endif

ifdef LOCAL_DEX_PREOPT

dexpreopt_boot_jar_module := $(filter $(LOCAL_MODULE),$(DEXPREOPT_BOOT_JARS_MODULES))

ifneq ($(dexpreopt_boot_jar_module),)

# boot jar's rules are defined in dex_preopt.mk

dexpreopted_boot_jar := $(DEXPREOPT_BOOT_JAR_DIR_FULL_PATH)/$(dexpreopt_boot_jar_module)_nodex.jar

$(LOCAL_BUILT_MODULE) : $(dexpreopted_boot_jar) | $(ACP)

	$(call copy-file-to-target)

dexpreopted_boot_odex := $(DEXPREOPT_BOOT_JAR_DIR_FULL_PATH)/$(dexpreopt_boot_jar_module).odex

built_odex := $(basename $(LOCAL_BUILT_MODULE)).odex

$(built_odex) : $(dexpreopted_boot_odex) | $(ACP)

	$(call copy-file-to-target)

else # dexpreopt_boot_jar_module

built_odex := $(basename $(LOCAL_BUILT_MODULE)).odex

$(built_odex): PRIVATE_MODULE := $(LOCAL_MODULE)

# Make sure the boot jars get dex-preopt-ed first

$(built_odex) : $(DEXPREOPT_BOOT_ODEXS)

$(built_odex) : $(common_javalib.jar) | $(DEXPREOPT) $(DEXOPT)

	@echo "Dexpreopt Jar: $(PRIVATE_MODULE) ($@)"

	$(hide) rm -f $@

	@mkdir -p $(dir $@)

	$(call dexpreopt-one-file,$<,$@)

$(LOCAL_BUILT_MODULE) : $(common_javalib.jar) | $(ACP)

	$(call copy-file-to-target)

ifneq (nostripping,$(LOCAL_DEX_PREOPT))

	$(call dexpreopt-remove-classes.dex,$@)

endif

endif # dexpreopt_boot_jar_module

else # LOCAL_DEX_PREOPT

$(LOCAL_BUILT_MODULE) : $(common_javalib.jar) | $(ACP)

	$(call copy-file-to-target)

endif # LOCAL_DEX_PREOPT

endif # !LOCAL_IS_STATIC_JAVA_LIBRARY

LOCAL_PROGUARD_ENABLED默认是打开的，不特别指定的话，就是起作用的，就可能做优化。这个功能让我想起来了，非常早曾经做非常底层寄存器操作的时候，要加上volitate 来防止编译器做优化一样。

仅仅须要再Makefile中增加一行就可以解决。例如以下:

LOCAL_PROGUARD_ENABLED:= disabled

编译还是照旧，执行还是照旧，但是就是出来了，真的不错，没搞清楚之前，非常累人啊，加油！

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