我从LITTLE ENDIAN开始使用SpectrumWorx Melodify SDK， 但是这些问题让我很困惑。
当我尝试通过Activity而不是ANativeActivity使用Melodify SDK时，出现了问题。 在doc API中，我们首先应该设置AppContext，如下面的代码：
void setAppContext (::ANativeActivity const &,::ndk_helper::JNIHelper const &)
void setAppContext (::ANativeActivity const &)
void setAppContext (::JavaVM &,::jobject activity,::jobject assetManager)
void setAppContext (::JavaVM &,::jobject activity)
#include "le/audioio/device.hpp"
#include "le/audioio/file.hpp"
#include "le/audioio/outputWaveFile.hpp"
#include "le/melodify/melodifyer.hpp"
#include "le/utility/entryPoint.hpp"
#include "le/utility/filesystem.hpp"
#include "le/utility/trace.hpp"
#include "le/utility/sleep.hpp"
#include <jni.h>
#include <android/log.h>
#define LOG_TAG "testjni"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
static JavaVM *g_VM;
extern "C" {
JNIEXPORT void JNICALL Java_com_example_ledemo_MainActivity_javaCallJNI(JNIEnv* env, jobject obj);
};
jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
JNIEnv* env;
if (vm->GetEnv((void**) &env, JNI_VERSION_1_6) != JNI_OK)
return -1;
g_VM = vm;
LOGI("JNI INIT");
return JNI_VERSION_1_6;
}
JNIEXPORT void JNICALL Java_com_example_ledemo_MainActivity_javaCallJNI(JNIEnv* env, jobject obj)
{
LOGI("JNI work !");
jclass clazz = env->FindClass("com/example/ledemo/MainActivity");
if (clazz == 0) {
LOGI("FindClass error");
return;
}
jmethodID javamethod = env->GetMethodID(clazz, "callFromCPP", "()V");
if (javamethod == 0) {
LOGI("GetMethodID error");
return;
}
env->CallVoidMethod(obj, javamethod);
using namespace LE;
LE::Utility::setAppContext(*g_VM, clazz);
LOGI("setContext finish");
}
12-30 15:15:34.251: A/SpectrumWorx SDK assertion failure(8638): methodGetAssets (271)
12-30 15:15:34.251: A/libc(8638): Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 8638 (.example.ledemo)**strong text**
#include "le/audioio/device.hpp"
#include "le/audioio/file.hpp"
#include "le/audioio/outputWaveFile.hpp"
#include "le/melodify/melodifyer.hpp"
#include "le/utility/entryPoint.hpp"
#include "le/utility/filesystem.hpp"
#include "le/utility/trace.hpp"
#include "le/utility/sleep.hpp"
#include <jni.h>
#include <android/log.h>
#include <assert.h>
// for native asset manager
#include <sys/types.h>
#include <android/asset_manager.h>
#include <android/asset_manager_jni.h>
#define LOG_TAG "testjni"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
static JavaVM *g_VM;
static jobject gActivity;
extern "C" {
JNIEXPORT void JNICALL Java_com_example_ledemo_MainActivity_javaCallJNI(JNIEnv* env, jobject obj);
};
jint JNI_OnLoad(JavaVM* vm, void* reserved) {
JNIEnv* env;
if (vm->GetEnv((void**) &env, JNI_VERSION_1_6) != JNI_OK)
return -1;
g_VM = vm;
LOGI("JNI INIT");
return JNI_VERSION_1_6;
}
JNIEXPORT void JNICALL Java_com_example_ledemo_MainActivity_javaCallJNI(JNIEnv* env, jobject obj)
{
LOGI("JNI work !");
jclass clazz = env->FindClass("com/example/ledemo/MainActivity");
if (clazz == 0) {
LOGI("FindClass error");
return;
}
jmethodID javamethod = env->GetMethodID(clazz, "callFromCPP", "()V");
if (javamethod == 0) {
LOGI("GetMethodID error");
return;
}
env->CallVoidMethod(obj, javamethod);
gActivity = (jobject)env->NewGlobalRef(clazz);
}
extern "C" void Java_com_example_ledemo_MainActivity_setJNI(JNIEnv* env, jclass clazz, jobject assetManager)
{
using namespace LE;
LE::Utility::setAppContext(*g_VM, gActivity, assetManager);
LOGI("setContext finish");
}
package com.example.ledemo;
import android.app.Activity;
import android.content.res.AssetManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
Button btn;
static AssetManager assetManager;
Activity activity;
public native void javaCallJNI();
public native void setJNI(AssetManager assetManager);
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
assetManager = getAssets();
Log.i("onCreate", "Native function begining");
javaCallJNI();
Log.i("onCreate", "Native function ending");
btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
setJNI(assetManager);
}
});
}
void callFromCPP() {
Log.i("callFromCPP", "JNI can call JAVA !");
return ;
}
12-30 15:55:12.646: I/testjni(12862): JNI INIT
12-30 15:55:12.694: I/onCreate(12862): Native function begining
12-30 15:55:12.694: I/testjni(12862): JNI work !
12-30 15:55:12.694: I/callFromCPP(12862): JNI can call JAVA !
12-30 15:55:12.695: I/onCreate(12862): Native function ending
12-30 15:55:33.327: W/dalvikvm(12862): JNI WARNING: JNI method called with exception pending
12-30 15:55:33.328: W/dalvikvm(12862): in Lcom/example/ledemo/MainActivity;.setJNI:(Landroid/content/res/AssetManager;)V (CallObjectMethodV)
12-30 15:55:33.328: W/dalvikvm(12862): Pending exception is:
12-30 15:55:33.328: I/dalvikvm(12862): java.lang.NoSuchMethodError: no method with name='getFilesDir' signature='()Ljava/io/File;' in class Ljava/lang/Class;
12-30 15:55:33.328: I/dalvikvm(12862): at com.example.ledemo.MainActivity.setJNI(Native Method)
12-30 15:55:33.328: I/dalvikvm(12862): at com.example.ledemo.MainActivity$1.onClick(MainActivity.java:49)
12-30 15:55:33.328: I/dalvikvm(12862): at android.view.View.performClick(View.java:4211)
12-30 15:55:33.328: I/dalvikvm(12862): at android.view.View$PerformClick.run(View.java:17446)
12-30 15:55:33.328: I/dalvikvm(12862): at android.os.Handler.handleCallback(Handler.java:725)
12-30 15:55:33.328: I/dalvikvm(12862): at android.os.Handler.dispatchMessage(Handler.java:92)
12-30 15:55:33.328: I/dalvikvm(12862): at android.os.Looper.loop(Looper.java:153)
12-30 15:55:33.329: I/dalvikvm(12862): at android.app.ActivityThread.main(ActivityThread.java:5297)
12-30 15:55:33.329: I/dalvikvm(12862): at java.lang.reflect.Method.invokeNative(Native Method)
12-30 15:55:33.329: I/dalvikvm(12862): at java.lang.reflect.Method.invoke(Method.java:511)
12-30 15:55:33.329: I/dalvikvm(12862): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
12-30 15:55:33.329: I/dalvikvm(12862): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
12-30 15:55:33.329: I/dalvikvm(12862): at dalvik.system.NativeStart.main(Native Method)
12-30 15:55:33.329: I/dalvikvm(12862): "main" prio=5 tid=1 NATIVE
12-30 15:55:33.330: I/dalvikvm(12862): | group="main" sCount=0 dsCount=0 obj=0x415a3a30 self=0x41592f10
12-30 15:55:33.330: I/dalvikvm(12862): | sysTid=12862 nice=0 sched=0/0 cgrp=apps handle=1074337884
12-30 15:55:33.330: I/dalvikvm(12862): | state=R schedstat=( 267627914 199014395 585 ) utm=19 stm=7 core=0
12-30 15:55:33.372: I/dalvikvm(12862): #00 pc 000012a0 /system/lib/libcorkscrew.so (unwind_backtrace_thread+27)
12-30 15:55:33.372: I/dalvikvm(12862): #01 pc 0006118e /system/lib/libdvm.so (dvmDumpNativeStack(DebugOutputTarget const*, int)+53)
12-30 15:55:33.372: I/dalvikvm(12862): #02 pc 00054aaa /system/lib/libdvm.so (dvmDumpThreadEx(DebugOutputTarget const*, Thread*, bool)+329)
12-30 15:55:33.372: I/dalvikvm(12862): #03 pc 00054b4a /system/lib/libdvm.so (dvmDumpThread(Thread*, bool)+25)
12-30 15:55:33.372: I/dalvikvm(12862): #04 pc 00038eba /system/lib/libdvm.so
12-30 15:55:33.373: I/dalvikvm(12862): #05 pc 00040f92 /system/lib/libdvm.so
12-30 15:55:33.373: I/dalvikvm(12862): #06 pc 0002b0f8 /data/app-lib/com.example.ledemo-2/liblittle-effect.so
12-30 15:55:33.373: I/dalvikvm(12862): #07 pc 0002ad34 /data/app-lib/com.example.ledemo-2/liblittle-effect.so
12-30 15:55:33.373: I/dalvikvm(12862): #08 pc 000066fe /data/app-lib/com.example.ledemo-2/liblittle-effect.so (Java_com_example_ledemo_MainActivity_setJNI+13)
12-30 15:55:33.373: I/dalvikvm(12862): #09 pc 0001e4d0 /system/lib/libdvm.so (dvmPlatformInvoke+112)
12-30 15:55:33.373: I/dalvikvm(12862): #10 pc 0004ddf8 /system/lib/libdvm.so (dvmCallJNIMethod(unsigned int const*, JValue*, Method const*, Thread*)+499)
12-30 15:55:33.374: I/dalvikvm(12862): #11 pc 00050190 /system/lib/libdvm.so (dvmResolveNativeMethod(unsigned int const*, JValue*, Method const*, Thread*)+171)
12-30 15:55:33.374: I/dalvikvm(12862): #12 pc 000278a0 /system/lib/libdvm.so
12-30 15:55:33.374: I/dalvikvm(12862): #13 pc 0002b804 /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+180)
12-30 15:55:33.374: I/dalvikvm(12862): #14 pc 000613ce /system/lib/libdvm.so (dvmInvokeMethod(Object*, Method const*, ArrayObject*, ArrayObject*, ClassObject*, bool)+373)
12-30 15:55:33.374: I/dalvikvm(12862): #15 pc 000692e8 /system/lib/libdvm.so
12-30 15:55:33.374: I/dalvikvm(12862): #16 pc 000278a0 /system/lib/libdvm.so
12-30 15:55:33.375: I/dalvikvm(12862): #17 pc 0002b804 /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+180)
12-30 15:55:33.375: I/dalvikvm(12862): #18 pc 000610a8 /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)+271)
12-30 15:55:33.375: I/dalvikvm(12862): #19 pc 0004a0d0 /system/lib/libdvm.so
12-30 15:55:33.375: I/dalvikvm(12862): #20 pc 0004d126 /system/lib/libandroid_runtime.so
12-30 15:55:33.375: I/dalvikvm(12862): #21 pc 0004decc /system/lib/libandroid_runtime.so (android::AndroidRuntime::start(char const*, char const*)+399)
12-30 15:55:33.375: I/dalvikvm(12862): #22 pc 00000db6 /system/bin/app_process
12-30 15:55:33.376: I/dalvikvm(12862): #23 pc 0001bd98 /system/lib/libc.so (__libc_init+64)
12-30 15:55:33.376: I/dalvikvm(12862): at com.example.ledemo.MainActivity.setJNI(Native Method)
12-30 15:55:33.376: I/dalvikvm(12862): at com.example.ledemo.MainActivity$1.onClick(MainActivity.java:49)
12-30 15:55:33.377: I/dalvikvm(12862): at android.view.View.performClick(View.java:4211)
12-30 15:55:33.377: I/dalvikvm(12862): at android.view.View$PerformClick.run(View.java:17446)
12-30 15:55:33.377: I/dalvikvm(12862): at android.os.Handler.handleCallback(Handler.java:725)
12-30 15:55:33.377: I/dalvikvm(12862): at android.os.Handler.dispatchMessage(Handler.java:92)
12-30 15:55:33.378: I/dalvikvm(12862): at android.os.Looper.loop(Looper.java:153)
12-30 15:55:33.378: I/dalvikvm(12862): at android.app.ActivityThread.main(ActivityThread.java:5297)
12-30 15:55:33.378: I/dalvikvm(12862): at java.lang.reflect.Method.invokeNative(Native Method)
12-30 15:55:33.378: I/dalvikvm(12862): at java.lang.reflect.Method.invoke(Method.java:511)
12-30 15:55:33.378: I/dalvikvm(12862): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
12-30 15:55:33.378: I/dalvikvm(12862): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
12-30 15:55:33.378: I/dalvikvm(12862): at dalvik.system.NativeStart.main(Native Method)
12-30 15:55:33.379: E/dalvikvm(12862): VM aborting
12-30 15:55:33.380: A/libc(12862): Fatal signal 11 (SIGSEGV) at 0xdeadd00d (code=1), thread 12862 (.example.ledemo)
我不知道如何处理，我已经搜索了很多方法，但仍然找不到合适的方法。真的需要帮助。
答案 0 :(得分：0)
您在这里所做的只是创建对已加载的类的全局引用：
jclass clazz = env->FindClass("com/example/ledemo/MainActivity");
gActivity = (jobject)env->NewGlobalRef(clazz);
您没有创建该类的实例，这是setAppContext所期望的。
您对setJNI的声明也有点不正确。而不是：
extern "C" void Java_com_example_ledemo_MainActivity_setJNI(
JNIEnv* env,
jclass clazz,
jobject assetManager)
它应该是：
extern "C" void Java_com_example_ledemo_MainActivity_setJNI(
JNIEnv* env,
jobject thiz, // <-- note the difference here
jobject assetManager)
jobject thiz参数是对调用本机方法的Java对象的引用（即您的MainActivity）。因此，您应该能够将thiz作为第二个参数传递给setAppContext（我不确定您是否还需要创建对它的全局引用）。