Android 请求网络接口实现方法
public class fragment01 extends fragment {
private static final string tag = "fragment01----";
private myhandler myhandler = new myhandler();
//判断网络状态
private final static int success = 0;
private final static int error = 1;
private listview listview;
@nullable
@override
public view oncreateview(@nonnull layoutinflater inflater, @nullable viewgroup container, @nullable bundle savedinstancestate) {
view view = inflater.inflate(r.layout.fragment01_layout, container, false);
listview = view.findviewbyid(r.id.fragment01_listview);
return view;
}
@override
public void onactivitycreated(@nullable bundle savedinstancestate) {
super.onactivitycreated(savedinstancestate);
//4.获取网络数据
new thread() {
@override
public void run() {
try {
url u = new url(httpconfig.one_url);
httpurlconnection connection = (httpurlconnection) u.openconnection();
connection.setconnecttimeout(5000);
if (connection.getresponsecode() == 200) {
inputstream inputstream = connection.getinputstream();
//5.封装工具类
string json = commenutils.inputstream2string(inputstream);
//6.使用handler,发送数据
message message = myhandler.obtainmessage();
message.what = success;
message.obj = json;
myhandler.sendmessage(message);
}
} catch (exception e) {
e.printstacktrace();
}
}
}.start();
}
class myhandler extends handler {
@override
public void handlemessage(message msg) {
switch (msg.what) {
case success:
//成功
string json = (string) msg.obj;
log.d(tag, "handlemessage: " + json);
//导包gson
gson gson = new gson();
//如果json就是一个纯数组的解析方式
type listtype = new typetoken>(){}.gettype();
linkedlist list = gson.fromjson(json, listtype);//7.根据接口，生成javabean
//8.书写adapter进行显示
list item = list.get(0).getitem();
myadapter myadapter = new myadapter(getactivity(), item);
listview.setadapter(myadapter);
break;
}
}
}
}