安卓数据持久化

//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();
    }

  SharedPreferences.Editor editor  = getSharedPreferences("data",MODE_PRIVATE).edit();
        editor.putString("name","tom");
        editor.putInt("age",28);
        editor.putBoolean("married",false);
        editor.apply();

        SharedPreferences pref= getSharedPreferences("data",MODE_PRIVATE);
        String name = pref.getString("name","");
        int age = pref.getInt("age",0);
        Boolean married = pref.getBoolean("married",false);
        Log.d(TAG, "onCreate: "+name);
        Log.d(TAG, "onCreate: "+age);
        Log.d(TAG, "onCreate: "+married);