安卓存储资源

本地永久存储字符串

 1 public void saveasfile(string content)
 2     {
 3         string headpath=android.os.environment.getexternalstoragedirectory()+"/aaa/mdoor.txt";
 4         filewriter fwriter=null;
 5         try {
 6             fwriter=new filewriter(headpath);
 7             fwriter.write(content);
 8         } catch (ioexception e) {
 9             // todo auto-generated catch block
10             e.printstacktrace();
11         }
12         try {
13             fwriter.flush();
14             fwriter.close();
15         } catch (ioexception e) {
16             // todo auto-generated catch block
17             e.printstacktrace();
18         }
19     }
20     public void readfile()
21     {
22         string headpath=android.os.environment.getexternalstoragedirectory()+"/aaa/mdoor.txt";
23         file file = new file(headpath);
24         bufferedreader reader=null;
25         try {
26             reader= new bufferedreader(new filereader(file));
27             string tempstring =null;
28             
29                 while((tempstring=reader.readline())!=null)
30                 {
31                     log.e("paytest","json"+tempstring );
32                     content=tempstring;
33                 }
34             
35             reader.close();
36         } catch (exception e) {
37             // todo auto-generated catch block
38             e.printstacktrace();
39         }finally{
40             if(reader!=null)
41             {
42                 try {
43                     reader.close();
44                 } catch (ioexception e) {
45                     // todo auto-generated catch block
46                     e.printstacktrace();
47                 }
48             }
49         }
50     }

从网上下载图片信息然后存储到本地

  1 public void savepic()
  2     {
  3         bitmap bitmap = null;
  4         try {
  5             
  6             bitmap =getpicture("https://qmby.feefoxes.com/h5/newlegend/version1/wechatapp/sharetest.jpg");
  7         } catch (exception e) {
  8             // todo auto-generated catch block
  9             e.printstacktrace();
 10             log.e("paytest", "aaa");
 11         }
 12         try {
 13             savebitmap(bitmap);
 14         } catch (exception e) {
 15             // todo auto-generated catch block
 16             e.printstacktrace();
 17             log.e("paytest", "hhh");
 18         }
 19     }
 20     public void savebitmap(bitmap bitmap) throws ioexception {
 21         //更改的名字
 22         string imagename="wwwwa"+".jpg";
 23         
 24         string headpath=android.os.environment.getexternalstoragedirectory()+"/aaa";
 25         log.e("headpath", headpath);
 26         log.e("headpath", headpath);
 27             file headdir=new file(headpath);
 28             if(!headdir.exists()){
 29                 headdir.mkdirs();
 30             }
 31             system.out.println(headpath+"\n"+headdir);    
 32             fileoutputstream headfos=null;
 33             file headfile=null;
 34             try{
 35                 //重命名并保存
 36                 headfile=new file(headpath,imagename);
 37                 headfile.createnewfile();
 38                 
 39                 headfos=new fileoutputstream(headfile);
 40                 bitmap.compress(compressformat.jpeg, 100, headfos);
 41                 headfos.flush();
 42                 
 43             }catch(exception e){
 44                 e.printstacktrace();
 45             }finally{
 46                 if(headfos!=null){
 47                     try {
 48                         headfos.close();
 49                     } catch (ioexception e) {
 50                         e.printstacktrace();
 51                     }
 52                 }
 53             }
 54         
 55     }
 56     /*
 57      * 从服务器端得到图片
 58      */
 59     public bitmap getpicture(string path) throws exception
 60     {
 61         bitmap bm=null;
 62         url url;
 63         try {  
 64             sslsocketfactory.getsocketfactory().sethostnameverifier(new allowallhostnameverifier());
 65             url = new url(path);//创建url对象  
 66             urlconnection conn=url.openconnection();//获取url对象对应的连接  
 67             conn.connect();//打开连接  
 68             inputstream is=conn.getinputstream();//获取输入流对象  
 69              /*string filepath=null;
 70              if(numberpic==1)
 71              {
 72                  filepath="tempdir"+numberpic+".png";
 73              }else if(numberpic==2)
 74              {
 75                  filepath="tempdir"+numberpic+".jpg";
 76              }
 77              byte[]data =readinputstream(is);
 78              
 79              file imagefile =new file(filepath);
 80             
 81             fileoutputstream outstream = new fileoutputstream(imagefile);
 82             
 83             outstream.write(data);
 84             
 85             
 86             log.e("data", ""+outstream);
 87             log.e("data", ""+outstream);
 88             */
 89             bm=bitmapfactory.decodestream(is);//根据输入流对象创建bitmap对象  
 90 //            outstream.close();
 91 //            is.close();
 92         } catch (malformedurlexception e1) {  
 93             e1.printstacktrace();//输出异常信息 
 94             log.e("paytest",""+"url");
 95         }catch (exception e) {  
 96             e.printstacktrace();//输出异常信息  
 97             log.e("paytest",""+"bb");
 98         }  
 99         return bm;
100     }