Question

我找不到任何相关内容（即使有Parse-Questions的内容）：

与一个好的旧网站计数器类似，我喜欢将数字存储在SD卡上的txt文件中。每次在应用程序中激活方法时，它应该读取一些txt文件，添加1并再次保存。

如果我尝试下面的代码，它会创建一个奇怪的字符串，而不是Int。如何解决这个问题呢？： - （

FileWriter writer;
File file;
FileInputStream fileIS;  

public void implementCounter()
{
    File sdcard = Environment.getExternalStorageDirectory();
    int counter = 0;

    try{

           File f = new File(sdcard +"/Experiment/Counter.txt");             
           fileIS = new FileInputStream(f);          
           BufferedReader buf = new BufferedReader(new InputStreamReader(fileIS));                               
           //counter = Integer.parseInt(buf.readLine());
           String readString = new String();             

           //just reading each line and pass it on the debugger          
           /*while((readString = buf.readLine())!= null){            
              Log.d("line: ", readString);           
           }*/
           readString = buf.readLine();
           try {
                counter = Integer.parseInt(readString.toString());
            } catch(NumberFormatException nfe) {
               Log.d("line: ", "XXX: " + readString + "E");
            } 


        } catch (FileNotFoundException e) {          
           e.printStackTrace();          
        } catch (IOException e){             
           e.printStackTrace();          
        }


    //Create / Write LogFile
    file = new File(sdcard + "/Experiment/Counter.txt");

    try 
    {
        counter++;
        writer = new FileWriter(file ,false);
        writer.write(counter);         
        writer.flush();
        writer.close();
    } 
    catch (IOException e) 
    {
        e.printStackTrace();
    }
}

这个想法是，新的FileWriter只是用一个数字覆盖旧文件。

Answer 1

这两个功能是静态的。您可以使用它们来检索您的计数并保存它（设置它）。有关详细信息，请尝试熟悉SharedPreferences。不客气（

    private static boolean setMyLovelyCount(Context mContext, int value) {
        SharedPreferences prefs = mContext.getSharedPreferences(
                "mylovelyprefs", 0);
        SharedPreferences.Editor editor = prefs.edit();
        editor.putInt("mylovelyCount", value);
        return editor.commit();
    }

    private static int getMyLovelyCount(Context mContext, int defaultvalue) {
        SharedPreferences prefs = mContext.getSharedPreferences(
                "mylovelyprefs", 0);
        return prefs.getInt("mylovelyCount", defaultvalue);
    }

将TEXT-File-Information解析为Integer

1 个答案: