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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
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HttpClient httpclient = new DefaultHttpClient(); HttpResponse response = httpclient.execute( new HttpGet(URL)); StatusLine statusLine = response.getStatusLine(); if (statusLine.getStatusCode() == HttpStatus.SC_OK){ ByteArrayOutputStream out = new ByteArrayOutputStream(); response.getEntity().writeTo(out); out.close(); String responseString = out.toString(); //..more logic } else { //Closes the connection. response.getEntity().getContent().close(); throw new 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
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class RequestTask extends AsyncTask<string, string= "" string,= "" >{ @Override protected String doInBackground(String... uri) { HttpClient httpclient = new DefaultHttpClient(); HttpResponse response; String responseString = null ; try { response = httpclient.execute( new HttpGet(uri[ 0 ])); StatusLine statusLine = response.getStatusLine(); if (statusLine.getStatusCode() == HttpStatus.SC_OK){ ByteArrayOutputStream out = new ByteArrayOutputStream(); response.getEntity().writeTo(out); out.close(); responseString = out.toString(); } else { //Closes the connection. response.getEntity().getContent().close(); throw new IOException(statusLine.getReasonPhrase()); } } catch (ClientProtocolException e) { //TODO Handle problems.. } catch (IOException e) { //TODO Handle problems.. } return responseString; } @Override protected void 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("https://stackoverflow.com");
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