Question

我正在尝试将数据从app数据库写入文本文件，我尝试了以下代码：

       Context context = getApplicationContext();

        File file = new File(context.getExternalFilesDir("routable"), "test.txt");



        if (!file.exists()) {
            try {
                file.createNewFile();
            } catch (Exception ex) {
                Log.e("open file Exception", ex.getMessage().toString());
            }
        }

        try {
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(context.openFileOutput(file.getName(), Context.MODE_APPEND));
            BufferedWriter writer = new BufferedWriter(outputStreamWriter);

            DAO dao = new DAO(getApplicationContext());
            Cursor res = dao.getSalePoints();
            res.moveToFirst();

            while (!res.isAfterLast()) {

                writer.write(res.getString(0) + ", ");
                writer.write(res.getString(1) + ", ");
                writer.write(res.getString(2) + ", ");
                writer.write(res.getString(3) + ", ");

            res.moveToNext();
        }



        writer.close();
        outputStreamWriter.close();

    } catch (Exception ex) {
        Log.e("Writing file Exception", ex.getMessage().toString());
    }

代码创建文件并且循环抛出数据，但不写入文件。

我添加了android.permission.WRITE_EXTERNAL_STORAGE" 在清单中。

Answer 1

context.openFileOutput(file.getName(),

替换为

new FileOutputStream(file,

将文本写入文件android

1 个答案: