android从网络获取数据

A. android如何从一个网络接口中获得json数据，并且进行解析呢

你可以用jsonsmart来解析： JSONValue.parseStrict(返回的数据) 进行解析，之后再根据json字段拿数据

B. android怎么从网络获取数据

通过线程 和HTTPclient 来获取网络数据的

建议看看视频教程 luo.apkbus.com/

C. android怎么获取网页数据

下面介绍三种获取网页数据的代码
例子来自于android学习手册，android学习手册包含9个章节，108个例子，源码文档随便看，例子都是可交互，可运行，源码采用android studio目录结构，高亮显示代码，文档都采用文档结构图显示，可以快速定位。360手机助手中下载,图标上有贝壳
//第一种
/**获取参数(ArrayList<NameValuePair> nameValuePairs,String url)后post给远程服务器
* 将获得的返回结果(String)返回给调用者
* 本函数适用于查询数量较少的时候
*/
public String posturl(ArrayList<NameValuePair> nameValuePairs,String url){
String result = "";
String tmp= "";
InputStream is = null;
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
return "Fail to establish http connection!";
}

try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();

tmp=sb.toString();
}catch(Exception e){
return "Fail to convert net stream!";
}

try{
JSONArray jArray = new JSONArray(tmp);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Iterator<?> keys=json_data.keys();
while(keys.hasNext()){
result += json_data.getString(keys.next().toString());
}
}
}catch(JSONException e){
return "The URL you post is wrong!";
}

return result;
}

//第二种
/**获取参数指定的网页代码，将其返回给调用者，由调用者对其解析
* 返回String
*/
public String posturl(String url){
InputStream is = null;
String result = "";

try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
return "Fail to establish http connection!"+e.toString();
}

try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();

result=sb.toString();
}catch(Exception e){
return "Fail to convert net stream!";
}

return result;
}

//第三种
/**获取指定地址的网页数据
* 返回数据流
*/
public InputStream streampost(String remote_addr){
URL infoUrl = null;
InputStream inStream = null;
try {
infoUrl = new URL(remote_addr);
URLConnection connection = infoUrl.openConnection();
HttpURLConnection httpConnection = (HttpURLConnection)connection;
int responseCode = httpConnection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
inStream = httpConnection.getInputStream();
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return inStream;

D. android 手机怎么连接电脑上的数据库，直接获取数据库数据

数据库很多，但是安卓直接支持的数据库只有sqlite一种。如果要使用其它的非本地数据库，你得建立连接，采用webservice或http协议中转数据。
安卓访问mysql里的数据得：
1)先建立网络，使用WIFI局域网
2)在PC建立数据访问接口，编写http协议应用（方法非常多。
asp、php、jsp都有访问mysql的方法），还得关掉防火墙
3)编写安卓手机客户端连接设备的http
service