我是个新手，目前想在android app中发起一个简单的http请求，该请求到一个php页面左的网页上取一些数据，有没有可以通过后台运行去网站取数据并解析的功能？
第一步，把下面的代码加入到你的 manifest 文件中，目的是放开网络访问权限
<uses-permission android:name="android.permission.INTERNET" />
然后就可以使用 Apache http client 访问页面了，在android中非常的简单就能完成
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | HttpClient httpclient = newDefaultHttpClient(); HttpResponse response = httpclient.execute(newHttpGet(URL)); StatusLine statusLine = response.getStatusLine(); if(statusLine.getStatusCode() == HttpStatus.SC_OK){ ByteArrayOutputStream out = newByteArrayOutputStream(); response.getEntity().writeTo(out); out.close(); String responseString = out.toString(); //..more logic }else{ //Closes the connection. response.getEntity().getContent().close(); thrownew IOException(statusLine.getReasonPhrase()); } |
如果你想在后台访问或者异步的方式运行，需要继承 AsyncTask，AsyncTask是专门单独线程跑后台任务的类
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | classRequestTask extendsAsyncTask<string, string=""string,="">{ @Override protectedString doInBackground(String... uri) { HttpClient httpclient = newDefaultHttpClient(); HttpResponse response; String responseString = null; try{ response = httpclient.execute(newHttpGet(uri[0])); StatusLine statusLine = response.getStatusLine(); if(statusLine.getStatusCode() == HttpStatus.SC_OK){ ByteArrayOutputStream out = newByteArrayOutputStream(); response.getEntity().writeTo(out); out.close(); responseString = out.toString(); }else{ //Closes the connection. response.getEntity().getContent().close(); thrownew IOException(statusLine.getReasonPhrase()); } }catch(ClientProtocolException e) { //TODO Handle problems.. }catch(IOException e) { //TODO Handle problems.. } returnresponseString; } @Override protectedvoid onPostExecute(String result) { super.onPostExecute(result); //Do anything with response.. }}</string,> |
最后你可以通过如下的方式调用
new RequestTask().execute("http://stackoverflow.com");
原文地址：http://www.itmmd.com/201410/91.html