java - 在 Android 中运行 native 可执行文件出现错误

Question

我试图使用下面的代码来运行 native ，但我在 Class execClass = Class.forName("android.os.Exec") 中得到了 android.os.exec 的 classnotfoundException...你有什么想法吗？ p>

    try {
    // android.os.Exec is not included in android.jar so we need to use reflection.
    Class<?> execClass = Class.forName("android.os.Exec");
    Method createSubprocess = execClass.getMethod("createSubprocess",
            String.class, String.class, String.class, int[].class);
    Method waitFor = execClass.getMethod("waitFor", int.class);

    // Executes the command.
    // NOTE: createSubprocess() is asynchronous.
    int[] pid = new int[1];
    FileDescriptor fd = (FileDescriptor)createSubprocess.invoke(
            null, "/system/bin/ls", "/sdcard", null, pid);

    // Reads stdout.
    // NOTE: You can write to stdin of the command using new FileOutputStream(fd).
    FileInputStream in = new FileInputStream(fd);
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    String output = "";
    try {
        String line;
        while ((line = reader.readLine()) != null) {
            output += line + "\n";
        }
    } catch (IOException e) {
        // It seems IOException is thrown when it reaches EOF.
    }

    // Waits for the command to finish.
    waitFor.invoke(null, pid[0]);

    return output;
} catch (ClassNotFoundException e) {
    throw new RuntimeException(e.getMessage());
} catch (SecurityException e) {
    throw new RuntimeException(e.getMessage());
} catch (NoSuchMethodException e) {
    throw new RuntimeException(e.getMessage());
} catch (IllegalArgumentException e) {
    throw new RuntimeException(e.getMessage());
} catch (IllegalAccessException e) {
    throw new RuntimeException(e.getMessage());
} catch (InvocationTargetException e) {
    throw new RuntimeException(e.getMessage());
}

链接:http://gimite.net/en/index.php?Run%20native%20executable%20in%20Android%20App

Answer 1

android.os.Exec 不是公共(public) API 的一部分，不应使用。事实上，自 1.6 版本以来，它就不再是产品的一部分，这应该是进一步的激励。 :-)

您应该使用标准的 Java 语言工具，例如 Runtime.exec() 或 ProcessBuilder.start()。