android创建文件夹跟文件和安装其他apk

一、android下创建文件夹

	File sd=Environment.getExternalStorageDirectory();        String path=sd.getPath()+"/notes";        File file=new File(path);        if(!file.exists())           file.mkdir();		

HttpClient httpClient = new DefaultHttpClient();						HttpGet httpGet= new HttpGet("http://img3.3lian.com/2006/016/09/031.jpg");						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 ;					        						   					    	    }					        }

三、android安装其他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);