一、推断是否有sdcard卡
//推断是否有SD卡 //ture:有SD卡 //false:没有SD卡 public boolean avaiableMedia(){ String status=Environment.getExternalStorageState(); if(status.equals(Environment.MEDIA_MOUNTED)){ return true; } else { return false; } }
二、下载文件至sdcard卡
if(avaiableMedia()){ HttpClient client = new DefaultHttpClient(); HttpGet get = new HttpGet(url); HttpResponse response; try { response = client.execute(get); HttpEntity entity = response.getEntity(); long length = entity.getContentLength(); InputStream is = entity.getContent(); FileOutputStream fileOutputStream = null; if (is != null) { File file = new File(Environment.getExternalStorageDirectory(),"test.apk"); fileOutputStream = new FileOutputStream(file); byte[] buf = new byte[1024]; int ch = -1; int count = 0; while ((ch = is.read(buf)) != -1) { fileOutputStream.write(buf, 0, ch); count += ch; } } fileOutputStream.flush(); if (fileOutputStream != null) { fileOutputStream.close(); } if (is != null) { is.close(); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }
三、下载文件至本应用程序的数据目录
else{ try { FileOutputStream outStream = this.openFileOutput("test.apk" , Context.MODE_WORLD_READABLE); HttpClient client = new DefaultHttpClient(); HttpGet get = new HttpGet(url); HttpResponse response; response = client.execute(get); HttpEntity entity = response.getEntity(); long length = entity.getContentLength(); InputStream is = entity.getContent(); int count = 0; if (is != null) { byte[] buf = new byte[1024]; int ch = -1; while ((ch = is.read(buf)) >0) { outStream.write(buf,0,ch); count += ch; Toast.makeText(getApplicationContext(),"正在下载升级包...",Toast.LENGTH_SHORT).show(); } } outStream.flush(); if (outStream != null) { outStream.close(); } if (is != null) { is.close(); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }