Question

嗨我有下面的写文件代码，读取a和b文件并将数据放入ab.xml文件

   String filePath1 = "/sdcard/Dictionarys/a.txt";
String filePath2 = "/sdcard/Dictionarys/b.txt";
String filePath3 = "/sdcard/Dictionarys/ab.xml";


        try {

        File file = new File(filePath3);
        file.createNewFile();

        BufferedReader br1 = new BufferedReader(new InputStreamReader(
                new FileInputStream(filePath1), UTF8), BUFFER_SIZE);

        BufferedReader br2 = new BufferedReader(new InputStreamReader(
                new FileInputStream(filePath2), UTF8), BUFFER_SIZE);
        FileOutputStream file3 = new FileOutputStream(filePath3);
        OutputStreamWriter out3 = new OutputStreamWriter(file3,UTF8);
        BufferedWriter br3 = new BufferedWriter(out3, BUFFER_SIZE);

        String sCurrentLine1, sCurrentLine2;

        while ((sCurrentLine1 = br1.readLine()) != null && ((sCurrentLine2 = br2.readLine())!=null)) {
            String s3 = sCurrentLine2.substring(sCurrentLine1.length());
            br3.write("<abcd abc=\""+sCurrentLine1+"\" def=\""+s3.trim()+"\"/> \n");
            br3.flush();
            i++;
        }
        br3.write("<data>\n");
        br3.flush();
        br3.close();
        out3.flush();
        out3.close();
        file3.close();
    } catch (Exception e) {
        e.printStackTrace();
    }

但是在SDCARD路径上没有创建xml文件..

Answer 1

尝试以这种方式获取Path：

 Environment.getExternalStorageDirectory()

有时字符串路径不起作用，并确保您在清单中添加了以下权限。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Answer 2

首先，您不应该将路径硬编码到SD卡，因为它可以在手机之间切换。请改用Context.getExternalFilesDir()或getExternalStoragePublicDirectory(String)等方法。

其次，某些文件系统具有缓冲。您应该使用fsync方法进行实际写入。有关详细信息，请参阅Saving Data Safely。

文件不是在SDCARD android上创建的

2 个答案: