在本地复制和解析 Android java.lang.unsatisfiedLinkError

我和一位朋友一起创建了一个Android应用程序来组织学校成绩。该应用程序在我的设备和大多数用户设备上运行良好，但是崩溃率超过3%，主要是因为Android版本7.0，8.1和9上发生。java.lang.UnsatisfiedLinkError

我已经在手机和几个模拟器上测试了该应用程序，包括所有体系结构。我将应用程序作为Android应用程序捆绑包上传到应用程序商店，并怀疑这可能是问题的根源。

我在这里有点迷茫，因为我已经尝试了几件事，但到目前为止，我无法减少发生次数，也无法在任何设备上重现它。任何帮助将不胜感激。

我发现这个资源指出Android有时无法解压缩外部库。因此，他们创建了一个ReLinker库，该库将尝试从压缩的应用程序中获取库：

不幸的是，这并没有减少由于 造成的崩溃数量。我继续我的在线研究，发现了这篇文章，这表明问题出在64位库。因此，我删除了 64 位库（该应用程序仍可在所有设备上运行，因为 64 位体系结构也可以执行 32 位库）。但是，错误仍然以与以前相同的频率发生。java.lang.UnsatisfiedLinkError

通过谷歌播放控制台，我得到了以下崩溃报告：

java.lang.UnsatisfiedLinkError: 
at ch.fidelisfactory.pluspoints.Core.Wrapper.callCoreEndpointJNI (Wrapper.java)
at ch.fidelisfactory.pluspoints.Core.Wrapper.a (Wrapper.java:9)
at ch.fidelisfactory.pluspoints.Model.Exam.a (Exam.java:46)
at ch.fidelisfactory.pluspoints.SubjectActivity.i (SubjectActivity.java:9)
at ch.fidelisfactory.pluspoints.SubjectActivity.onCreate (SubjectActivity.java:213)
at android.app.Activity.performCreate (Activity.java:7136)
at android.app.Activity.performCreate (Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1272)
at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2908)
at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3063)
at android.app.servertransaction.LaunchActivityItem.execute (LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1823)
at android.os.Handler.dispatchMessage (Handler.java:107)
at android.os.Looper.loop (Looper.java:198)
at android.app.ActivityThread.main (ActivityThread.java:6729)
at java.lang.reflect.Method.invoke (Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:876)

是调用我们的本机库的类。然而，它所指向的行只是如下所示：Wrapper.java

import java.util.HashMap;

它是我们本机 cpp 库的入口点。ch.fidelisfactory.pluspoints.Core.Wrapper.callCoreEndpointJNI

在原生cpp库中，我们使用一些外部库（curl，jsoncpp，plog-logging，sqlite和tinyxml2）。

编辑2019年6月4日

根据要求，此处的代码为：Wrapper.java

package ch.fidelisfactory.pluspoints.Core;

import android.content.Context;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.Serializable;
import java.util.HashMap;

import ch.fidelisfactory.pluspoints.Logging.Log;

/***
 * Wrapper around the cpp pluspoints core
 */
public class Wrapper {

    /**
     * An AsyncCallback can be given to the executeEndpointAsync method.
     * The callback method will be called with the returned json from the core.
     */
    public interface AsyncCallback {
        void callback(JSONObject object);
    }

    public static boolean setup(Context context) {
        String path = context.getFilesDir().getPath();
        return setupWithFolderAndLogfile(path,
                path + "/output.log");
    }

    private static boolean setupWithFolderAndLogfile(String folderPath, String logfilePath) {

        HashMap<String, Serializable> data = new HashMap<>();
        data.put("folder", folderPath);
        data.put("logfile", logfilePath);

        JSONObject res = executeEndpoint("/initialization", data);
        return !isErrorResponse(res);
    }

    public static JSONObject executeEndpoint(String path, HashMap<String, Serializable> data) {

        JSONObject jsonData = new JSONObject(data);

        String res = callCoreEndpointJNI(path, jsonData.toString());
        JSONObject ret;
        try {
            ret = new JSONObject(res);
        } catch (JSONException e) {
            Log.e("Error while converting core return statement to json.");
            Log.e(e.getMessage());
            Log.e(e.toString());
            ret = new JSONObject();
            try {
                ret.put("error", e.toString());
            } catch (JSONException e2) {
                Log.e("Error while putting the error into the return json.");
                Log.e(e2.getMessage());
                Log.e(e2.toString());
            }
        }
        return ret;
    }

    public static void executeEndpointAsync(String path, HashMap<String, Serializable> data, AsyncCallback callback) {
        // Create and start the task.
        AsyncCoreTask task = new AsyncCoreTask();
        task.setCallback(callback);
        task.setPath(path);
        task.setData(data);
        task.execute();
    }

    public static boolean isErrorResponse(JSONObject data) {
        return data.has("error");
    }

    public static boolean isSuccess(JSONObject data) {
        String res;
        try {
            res = data.getString("status");
        } catch (JSONException e) {
            Log.w(String.format("JsonData is no status message: %s", data.toString()));
            res = "no";
        }
        return res.equals("success");
    }

    public static Error errorFromResponse(JSONObject data) {
        String errorDescr;
        if (isErrorResponse(data)) {
            try {
                errorDescr = data.getString("error");
            } catch (JSONException e) {
                errorDescr = e.getMessage();
                errorDescr = "There was an error while getting the error message: " + errorDescr;
            }

        } else {
            errorDescr = "Data contains no error message.";
        }
        return new Error(errorDescr);
    }

    private static native String callCoreEndpointJNI(String jPath, String jData);

    /**
     * Log a message to the core
     * @param level The level of the message. A number from 0 (DEBUG) to 5 (FATAL)
     * @param message The message to log
     */
    public static native void log(int level, String message);
}

此外，这里是入口点的cpp定义，然后调用我们的核心库：

#include <jni.h>
#include <string>
#include "pluspoints.h"

extern "C"
JNIEXPORT jstring JNICALL
Java_ch_fidelisfactory_pluspoints_Core_Wrapper_callCoreEndpointJNI(
        JNIEnv* env,
        jobject /* this */,
        jstring jPath,
        jstring jData) {

    const jsize pathLen = env->GetStringUTFLength(jPath);
    const char* pathChars = env->GetStringUTFChars(jPath, (jboolean *)0);

    const jsize dataLen = env->GetStringUTFLength(jData);
    const char* dataChars = env->GetStringUTFChars(jData, (jboolean *)0);


    std::string path(pathChars, (unsigned long) pathLen);
    std::string data(dataChars, (unsigned long) dataLen);
    std::string result = pluspoints_execute(path.c_str(), data.c_str());


    env->ReleaseStringUTFChars(jPath, pathChars);
    env->ReleaseStringUTFChars(jData, dataChars);

    return env->NewStringUTF(result.c_str());
}

extern "C"
JNIEXPORT void JNICALL Java_ch_fidelisfactory_pluspoints_Core_Wrapper_log(
        JNIEnv* env,
        jobject,
        jint level,
        jstring message) {

    const jsize messageLen = env->GetStringUTFLength(message);
    const char *messageChars = env->GetStringUTFChars(message, (jboolean *)0);
    std::string cppMessage(messageChars, (unsigned long) messageLen);
    pluspoints_log((PlusPointsLogLevel)level, cppMessage);
}

这里是 pluspoints.h 文件：

/**
 * Copyright 2017 FidelisFactory
 */

#ifndef PLUSPOINTSCORE_PLUSPOINTS_H
#define PLUSPOINTSCORE_PLUSPOINTS_H

#include <string>

/**
 * Send a request to the Pluspoints core.
 * @param path The endpoint you wish to call.
 * @param request The request.
 * @return The return value from the executed endpoint.
 */
std::string pluspoints_execute(std::string path, std::string request);

/**
 * The different log levels at which can be logged.
 */
typedef enum {
    LEVEL_VERBOSE = 0,
    LEVEL_DEBUG = 1,
    LEVEL_INFO = 2,
    LEVEL_WARNING = 3,
    LEVEL_ERROR = 4,
    LEVEL_FATAL = 5
} PlusPointsLogLevel;

/**
 * Log a message with the info level to the core.
 *
 * The message will be written in the log file in the core.
 * @note The core needs to be initialized before this method can be used.
 * @param level The level at which to log the message.
 * @param logMessage The log message
 */
void pluspoints_log(PlusPointsLogLevel level, std::string logMessage);

#endif //PLUSPOINTSCORE_PLUSPOINTS_H