Android应用运行自定义可执行文件 - 权限被拒绝

Question

我正在开发一个项目，我必须将C / C ++应用程序移植到Android。我使用CMake和https://github.com/taka-no-me/android-cmake

中的android工具链进行了成功构建

在构建之后，我将可执行文件推送到Android模拟器并在shell（ADB shell）中调用它们。这些东西运作良好。目前我正在开发一个Android应用程序，我想从Java调用复制的可执行文件。 这些文件位于/ data / local / myfolder下，并具有以下权限

 -rwxrwxrwx root     root           37 2016-08-02 06:30 rexx

我的问题是，是否可以从Java代码运行我的可执行文件？我尝试了以下来源：

private void runSingleCommand(){
    try {
        Process process = Runtime.getRuntime().exec("rexx", null, new File("/data/local/myfolder/")); //Permission denied exception

        InputStreamReader reader = new InputStreamReader(process.getInputStream());
        BufferedReader bufferedReader = new BufferedReader(reader);
        int numRead;
        char[] buffer = new char[5000];
        StringBuffer commandOutput = new StringBuffer();
        while ((numRead = bufferedReader.read(buffer)) > 0) {
            commandOutput.append(buffer, 0, numRead);
        }
        bufferedReader.close();
        process.waitFor();

        System.out.println("--> Output: "+commandOutput.toString());

    } catch (IOException e) {
        throw new RuntimeException(e);
    } catch (InterruptedException e) {
        throw new RuntimeException(e);
    }

}

执行此代码我得到以下异常

java.lang.RuntimeException: java.io.IOException: Error running exec(). Command: [rexx.sh] Working Directory: /data/local/oorexx Environment: null
     at org.oorexx.oorexxforandroid.org.oorexx.oorexxforandroid.exec.RexxExecuter.runSingleCommand(RexxExecuter.java:146)
     at org.oorexx.oorexxforandroid.org.oorexx.oorexxforandroid.exec.RexxExecuter.runTheRexxImage(RexxExecuter.java:24)
     at org.oorexx.oorexxforandroid.MainActivity.onCreate(MainActivity.java:41)
     at android.app.Activity.performCreate(Activity.java:5231)
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233) 
     at android.app.ActivityThread.access$800(ActivityThread.java:135) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:136) 
     at android.app.ActivityThread.main(ActivityThread.java:5001) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:515) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
     at dalvik.system.NativeStart.main(Native Method) 
  Caused by: java.io.IOException: Error running exec(). Command: [rexx.sh] Working Directory: /data/local/oorexx Environment: null
     at java.lang.ProcessManager.exec(ProcessManager.java:211)
     at java.lang.Runtime.exec(Runtime.java:173)
     at java.lang.Runtime.exec(Runtime.java:246)
     at org.oorexx.oorexxforandroid.org.oorexx.oorexxforandroid.exec.RexxExecuter.runSingleCommand(RexxExecuter.java:127)
     at org.oorexx.oorexxforandroid.org.oorexx.oorexxforandroid.exec.RexxExecuter.runTheRexxImage(RexxExecuter.java:24) 
     at org.oorexx.oorexxforandroid.MainActivity.onCreate(MainActivity.java:41) 
     at android.app.Activity.performCreate(Activity.java:5231) 
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233) 
     at android.app.ActivityThread.access$800(ActivityThread.java:135) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:136) 
     at android.app.ActivityThread.main(ActivityThread.java:5001) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:515) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
     at dalvik.system.NativeStart.main(Native Method) 
  Caused by: java.io.IOException: Permission denied
     at java.lang.ProcessManager.exec(Native Method)
     at java.lang.ProcessManager.exec(ProcessManager.java:209)
     at java.lang.Runtime.exec(Runtime.java:173) 
     at java.lang.Runtime.exec(Runtime.java:246) 
     at org.oorexx.oorexxforandroid.org.oorexx.oorexxforandroid.exec.RexxExecuter.runSingleCommand(RexxExecuter.java:127) 
     at org.oorexx.oorexxforandroid.org.oorexx.oorexxforandroid.exec.RexxExecuter.runTheRexxImage(RexxExecuter.java:24) 
     at org.oorexx.oorexxforandroid.MainActivity.onCreate(MainActivity.java:41) 
     at android.app.Activity.performCreate(Activity.java:5231) 
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233) 
     at android.app.ActivityThread.access$800(ActivityThread.java:135) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:136) 
     at android.app.ActivityThread.main(ActivityThread.java:5001) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:515)

我经常搜索，但是如果（以及如何）在没有root用户的情况下从Java运行可执行文件，我没有找到一个明确的答案。