public class MainActivity extends AppCompatActivity {
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView=(TextView)findViewById(R.id.mytext);
//异步任务；
MyTask task=new MyTask();
task.execute("");
}
class MyTask extends AsyncTask<String,Integer,String>{
@Override
protected String doInBackground(String... params) {
//网络请求
return getPostData();
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
//json解析
Gson gson=new Gson();
DataBean bean=gson.fromJson(s,DataBean.class);
String text=bean.result.data.get(0).imtro;
//更新UI操作
textView.setText(text);
}
}
//通过post请求来从网络读取数据；
private String getPostData(){
String path="http://apis.juhe.cn/cook/query.php";
try {
String value="menu="+ URLEncoder.encode("白菜","utf-8")+"&key=13af589c334ec80c037688e927407966&rn=1";
//post的URL不要加参数值；
URL url=new URL(path);
HttpURLConnection connection=(HttpURLConnection)url.openConnection();
//设置请求方式为post；默认是get；
connection.setRequestMethod("POST");
//设置输出数据
connection.setDoOutput(true);
//获取一个输出流，用来设置参数
OutputStream outputStream=connection.getOutputStream();
//将参数放入输出流中；
outputStream.write(value.getBytes());
//获取连接状态码
int code=connection.getResponseCode();
if(code==200){
//获取请求返回的数据
InputStream inputStream=connection.getInputStream();
//将输入流转换为string
BufferedReader reader=new BufferedReader(new InputStreamReader(inputStream));
String result="";
String str=null;
while((str=reader.readLine())!=null){
result+=str;
}
return result;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
不要忘了加权限
