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最新推荐文章于 2025-07-19 17:23:33 发布

原创最新推荐文章于 2025-07-19 17:23:33 发布 · 510 阅读

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CC 4.0 BY-SA版权

本文详细介绍了如何在MVC架构中实现网络请求，通过定义Model、View和Presenter接口，使用AsyncTask进行异步网络操作，解析JSON数据，并将结果传递给View层展示。

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清单文件

	 <uses-permission android:name="android.permission.INTERNET" />

callback

public interface MyCallback {
    void setData(Object data);
}

VIew

public interface IView {
    void setData(Object data);
}

NetUtil

public class NetUtil {

public static String setResult(String path){
    String result="";
    try {
        URL url=new URL(path);
        HttpURLConnection http= (HttpURLConnection) url.openConnection();
        int responseCode = http.getResponseCode();
        if (responseCode==200){
            result=stringTo(http.getInputStream());
        }
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
   return  result;
}

private static String stringTo(InputStream inputStream) throws IOException {
    InputStreamReader inputStreamReader=new InputStreamReader(inputStream);
    BufferedReader br=new BufferedReader(inputStreamReader);
    StringBuilder builder=new StringBuilder();
    for (String t=br.readLine();t!=null;t=br.readLine()){
        builder.append(t);
    }
    return builder.toString();
}
}

Model

public interface Model {
    void setRequestData(String path, Class clazz, MyCallback myCallback);
}

Modelimpl

public class Modelimpl implements Model{
	    private MyCallback callback;
	    @SuppressLint("StaticFieldLeak")
	    @Override
	    public void setRequestData(String path, final Class clazz, MyCallback myCallback) {
	        callback=myCallback;
	        new AsyncTask<String,Void,Object>(){
	            @Override
	            protected Object doInBackground(String... strings) {
	                return setResult(strings[0],clazz);
	            }

        @Override
        protected void onPostExecute(Object o) {
            super.onPostExecute(o);
            callback.setData(o);
        }
    }.execute(path);
}
public <T> T setResult(String path,Class clazz){
    String json = NetUtil.setResult(path);
    Gson gson=new Gson();
    T t  = (T) gson.fromJson(json, clazz);
    return t;
}
}

Presenter

public interface Presenter {
    void setRequestData(String path,Class clazz);
}

Presenterimpl

public class Presenterimpl implements Presenter{
    private IView iView;
    private Model model;

public Presenterimpl(IView iView) {
    this.iView = iView;
    model=new Modelimpl();
}

@Override
public void setRequestData(String path, Class clazz) {
   model.setRequestData(path, clazz, new MyCallback() {
       @Override
       public void setData(Object data) {
           iView.setData(data);
       }
   });
}
public void des(){
    if (iView!=null){
        iView=null;
    }
    if (model!=null){
        model=null;
    }
}
}