安卓文件操作常用操作写法

eumnq8

1、android下创建目录
File sd=Environment.getExternalStorageDirectory();
String path=sd.getPath()+"/files";
File file=new File(path);
if(!file.exists())
   file.mkdir();
          
2、android下创建文件
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet= new HttpGet("http://xxx.com/payload.apk");
HttpResponse httpResponse = httpClient.execute(httpGet);
if(httpResponse.getStatusLine().getStatusCode() == 200){
         total_length = httpResponse.getEntity().getContentLength();
         is = httpResponse.getEntity().getContent() ;     
         File file = new File(Environment.getExternalStorageDirectory(), "aupdata.jpg");     
         fos = new FileOutputStream(file);     
         bis = new BufferedInputStream(is);     
         byte[] buffer = new byte[1024];  
         byte [] result_two = new byte [(int) total_length];
         int len = 0;     
        int total=0;  
        while((len = bis.read(buffer)) > -1){
                System.arraycopy(buffer, 0, result_two, total, len);
                fos.write(buffer, 0, len);
                total = total + len ;
                }
        }

FileOutputStream定义文件后。用.write方法写入内容，就能够创建相应文件了。

3、android安装其它apk
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
File install_file = new File(Environment.getExternalStorageDirectory() , "MyWeb.apk");
intent.setDataAndType(Uri.fromFile(install_file), "application/vnd.android.package-archive");
startActivity(intent);