Question

系统环境：Android Studio 3.4，其中Gradle插件版本为3.4.0，而Gradle插件版本为5.1.1。我创建了一个新项目->文件->新建->导入示例-> Ndk-> Hello JNI。我将build.gradle文件minSdkVersion更改为22，因为我的Nexus 7无法执行更多操作。然后我从https://sourceforge.net/projects/jexcelandroid/下载了jexcel_android.jar并将jexcel_android.jar复制到... app / libs / 在HelloJni.java中，我添加了一些代码，以查看详细信息。在AndroidManifest中，我刚刚添加了写入sdcard的权限。

–我没有更改或添加任何其他内容。我能够在Nexus 7和Nexus 5x上安装并运行该应用程序。在Nexus 7上创建的文件会显示预期的英文字母。 Nexus 5x上创建的文件显示了非预期的中文字母。为什么？通常，两种设备在所有其他应用上都显示英文字母。

这是我在HelloJni.java中添加的代码：字符串str =“”;

class Component
{
    public:
        typedef uint16_t    TypeID;
        static const TypeID TYPE_ID_UNKNOWN = -1;

        virtual ~Component() = default;

        virtual void test()
        {
            std::cout << "I'm the base!" << std::endl;
        }
};

class AComponent : public Component
{
    private:
        static int  nextValue;
        int     someValue;      // To test if different sizes of Component derivatives cause any problems!

    public:
        AComponent()
        {
            this->someValue = nextValue++;
        }

        void test()
        {
            std::cout << "I'm AComponent! Value: " << someValue << std::endl;
        }
};

int AComponent::nextValue = 0;

class BComponent : public Component
{
    public:
        void test()
        {
            std::cout << "I'm BComponent!" << std::endl;
        }
};

class CComponent : public Component
{
    public:
        void test()
        {
            std::cout << "I'm CComponent!" << std::endl;
        }
};

适用于Nexus 7的Android Studio的Logcat看起来像预期的那样。但是在Nexus 5x中，我得到了很多信息/错误输出。约5倍于此，每次相同，所以您只会看到不重复的内容：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    /* Retrieve our TextView and set its content.
     * the text is retrieved by calling a native
     * function.
     */
    setContentView(R.layout.activity_hello_jni);
    TextView tv = (TextView)findViewById(R.id.hello_textview);

    WritableWorkbook wb = createWorkbook("my.xls");
    WritableSheet sh = createSheet(wb,"mysheet", 0);
    try {
        //writeCell(0, 0,  "hi", true, sh);
        wb.write();
        wb.close();
    }
    catch (
            IOException ex) {
        ex.printStackTrace();
    }
    catch (
            WriteException ex) {
        ex.printStackTrace();
    }
    str += "\n" +stringFromJNI();
    tv.setText( str );
}




/**
 *
 * @param wb - WritableWorkbook to create new sheet in
 * @param sheetName - name to be given to new sheet
 * @param sheetIndex - position in sheet tabs at bottom of workbook
 * @return - a new WritableSheet in given WritableWorkbook
 */
public WritableSheet createSheet(WritableWorkbook wb,
                                 String sheetName, int sheetIndex){
    //create a new WritableSheet and return it
    return wb.createSheet(sheetName, sheetIndex);
}
/**
 *
 * @param fileName - the name to give the new workbook file
 * @return - a new WritableWorkbook with the given fileName
 */
public WritableWorkbook createWorkbook(String fileName){
    //exports must use a temp file while writing to avoid memory hogging
    WorkbookSettings wbSettings = new WorkbookSettings();
    wbSettings.setUseTemporaryFileDuringWrite(true);
    str += wbSettings.getLocale().getLanguage();
    //Log.i("HelloJni", " wbSettings.getLocale().getLanguage()=" +wbSettings.getLocale().getLanguage());
    //get the sdcard's directory
    File sdCard = Environment.getExternalStorageDirectory();
    //add on the your app's path
    File dir = new File(sdCard.getAbsolutePath() + "/");
    //make them in case they're not there
    dir.mkdirs();
    //create a standard java.io.File object for the Workbook to use
    File wbfile = new File(dir,fileName);

    WritableWorkbook wb = null;

    try{
        //create a new WritableWorkbook using the java.io.File and
        //WorkbookSettings from above
        wb = Workbook.createWorkbook(wbfile,wbSettings);
    }catch(IOException ex){
        Log.e(className,ex.getStackTrace().toString());
        Log.e(className, ex.getMessage());
    }

    return wb;
}

为什么相同的android java代码在设备Nexus 7和设备Nexus 5x上显示不同的语言

0 个答案: