//文件类型

 void save(String string){ 
        FileOutputStream out=null; 
        BufferedWriter writer = null; 
        try{ 
            out = openFileOutput("data", Context.MODE_APPEND); 
            writer = new BufferedWriter(new OutputStreamWriter(out)); 
            writer.write(string); 
        }catch (IOException e) { 
            e.printStackTrace(); 
        }finally { 
            try { 
                if(writer!=null){ 
                    writer.close(); 
                } 
            }catch (IOException e){ 
                e.printStackTrace(); 
            } 
        } 
    } 
 
     public String load(){ 
        FileInputStream in =null; 
        BufferedReader reader = null; 
        StringBuilder content= new StringBuilder(); 
        try{ 
           in  =openFileInput("data"); 
           reader  =new BufferedReader(new InputStreamReader(in)); 
           String line=""; 
           while ((line=reader.readLine())!=null){ 
               content.append(line); 
           } 
        }catch (IOException e){ 
            e.printStackTrace(); 
        }finally { 
            if(reader!=null){ 
                try{ 
                    reader.close(); 
                }catch (IOException e){ 
                    e.printStackTrace(); 
                } 
            } 
        } 
        return content.toString(); 
    }