Android将日志写入文本文件

Question

我正在尝试使用我的此代码将日志写入 Android 文件上的自定义 Log.txt 文件，但随后此方法会创建文件但不包含任何内容。基本上我想读取文件的先前内容，然后将我的数据附加到现有内容中。

代码如下:

public static void write(String str) 
    {
        InputStream fileInputStream = null;
        FileOutputStream fileOutpurStream = null;
        try
        { 
            fileInputStream = new FileInputStream(file);
            fileOutpurStream = new FileOutputStream(file);
            if(file.exists())
            {
                int ch = 0;
                int current = 0;
                StringBuffer buffer = new StringBuffer();
                while((ch = fileInputStream.read()) != -1)
                {
                    buffer.append((char) ch);
                    current++;
                }
                byte data[]=new byte[(int)file.length()];
                fileInputStream.read(data);   
                fileOutpurStream.write(data);
                fileOutpurStream.write(str.getBytes(),0,str.getBytes().length);
                fileOutpurStream.flush();
            } 
            else
            {   
                file.createNewFile();
                fileOutpurStream.write(str.getBytes(),0,str.getBytes().length);
                fileOutpurStream.flush();
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                fileInputStream.close();
                fileOutpurStream.flush();
                fileOutpurStream.close();
                fileOutpurStream = null;
                fileInputStream = null;
            }
            catch (IOException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

Answer 1

希望这可以帮助...

public void appendLog(String text)
{       
   File logFile = new File("sdcard/log.file");
   if (!logFile.exists())
   {
      try
      {
         logFile.createNewFile();
      } 
      catch (IOException e)
      {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }
   try
   {
      //BufferedWriter for performance, true to set append to file flag
      BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true)); 
      buf.append(text);
      buf.newLine();
      buf.close();
   }
   catch (IOException e)
   {
      // TODO Auto-generated catch block
      e.printStackTrace();
   }
}