android文件读写

来源：互联网发布：拳击实战知乎编辑：程序博客网时间：2024/06/03 14:08

公司最近要做一个测试工具，其中要用到文件的读写，因为以前学Java的时候对文件操作这方面写的比较少，正好有此机会也当是练手了。要求就是把指定的logcat信息拼成字符串然后保存到本地文件，优先保存到外置SD卡，当没有检测到外置SD卡时，保存到本地存储，代码如下

private File file = null；private FileOutputStream outputStream = null;private InputStreamReader fileReader = null;

// write file to local External SD-Card or Built-in SD-Card    public void writeFileToLocal(String content){        try {            if(checkSDCardIsMounted()){                FILENAME = CARD + "qtb01testlog.txt";            }else{                FILENAME = Environment.getExternalStorageDirectory().toString() + File.separator + "qtb01testlog.txt";            }            file = new File(FILENAME);            if(file.exists()){                file.delete();            }else{                file.createNewFile();               }            outputStream  = new FileOutputStream(file,true);            outputStream.write(content.getBytes("utf-8"));          } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }finally{            try {                outputStream.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }

// get the file pathpublic String getFilePath(){    return file.getPath();}

// read file    public synchronized String readLocaFile(String filePath) {        String fileContent = "";        try {              file = new File(filePath);            if(file.isFile() && file.exists()){                fileReader = new InputStreamReader(new FileInputStream(file),"UTF-8");                BufferedReader reader=new BufferedReader(fileReader);                String line;                while ((line = reader.readLine()) != null) {                    fileContent += line+"\n";                }               }        } catch (Exception e) {            e.printStackTrace();        }finally{            try {                fileReader.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return fileContent;    }

// set decimal point of threepublic static String setDecimals(double d){    DecimalFormat df = new DecimalFormat("#.000");      return df.format(d);}

实际上文件的读写操作是最基本的知识，以流的形式写和度也是最基本的最简单的，必须掌握。

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