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所以我正在编写一个应用程序，它将返回两个演员的共同电影作品。我已经解析了包含数据的 JSON，直到我有两个 ArrayLists 包含每个搜索查询的电影。然后，我制作了一个 commonFilmography 列表，其中仅包含两个搜索查询共有的标题。我想在列表视图中显示此列表。到目前为止我所做的研究使我相信我需要在 AsyncTask 中执行此操作，因为它是一个网络操作，并且我的类应该返回 ArrayList> 类型。我不确定我的 return commonFilmography 声明的范围在哪里。它不断出现未定义。总的来说，我的方法是最好的方法吗？我是 Android 和 Java 的新手，并且正在快速学习。另外我在第 159 行有一个警告 HashSet 是原始类型。不确定那是什么意思。谢谢！

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

import android.widget.EditText;
import android.widget.Button;
import android.view.View;
import android.util.Log;


import java.util.ArrayList;

import java.util.HashMap;
import java.util.List;
import java.util.*;

import org.json.JSONArray;
import org.json.JSONException;

import org.json.JSONObject;



public class Main extends Activity {

private static String personURL = "http://api.themoviedb.org/3/search/person?api_key=bb0b6d66c2899aefb4d0863b0d37dc4e&query=";
private static String creditURlBase = "http://api.themoviedb.org/3/person";
private static String TAG_CAST = "cast";
private static String TAG_ID = "id";
private static String TAG_NAME = "name";
private static String TAG_RESULTS = "results";
private static String TAG_TITLE = "title";

String title = null;

JSONArray idOne = null;
JSONArray idTwo = null;

JSONArray firstCast = null;
JSONArray secondCast = null;


EditText searchOne;
EditText searchTwo;

Button findMovies;

List<String> searchOneFilmography = new ArrayList<String>();
List<String> searchTwoFilmography = new ArrayList<String>();
ArrayList<HashMap<String, String>> commonFilmogrpahy = new ArrayList<HashMap<String, String>>();




@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.totlayout);

    searchOne = (EditText) findViewById(R.id.searchOne);
    searchTwo = (EditText) findViewById(R.id.searchTwo);

    findMovies = (Button) findViewById(R.id.findMovies);



    //getting

    findMovies.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub


            new getResults().execute();

        }
    });
}
public class getResults extends AsyncTask<String, Void, ArrayList<HashMap<String, String>> > {

    @Override
    protected ArrayList<HashMap<String, String>> doInBackground(
            String... params) {
        // TODO Auto-generated method stub

        //get names from each text box
        String nameOne = searchOne.getText().toString();
        String nameTwo = searchTwo.getText().toString();

        nameOne = nameOne.replace(" ", "_");
        nameTwo = nameTwo.replace(" ", "_");

        String searchOneURL = personURL + nameOne;
        String searchTwoURL = personURL + nameTwo;

        //Hashmap for ListView


        //Create JSON Parser Instanece
        JSONParser jParser = new JSONParser();

        //getting JSON string from url
        JSONObject jsonOne = jParser.getJSONFromUrl(searchOneURL);
        JSONObject jsonTwo = jParser.getJSONFromUrl(searchTwoURL);


        try {
            //Get ID of each person
            idOne = jsonOne.getJSONArray(TAG_ID);
            idTwo = jsonTwo.getJSONArray(TAG_ID);


            String firstID = null;
            String secondID = null;
            for(int i = 0; i < idOne.length(); i++){
                JSONObject iDeeOne = idOne.getJSONObject(i);

                //store each json item in variable
                firstID = iDeeOne.getString(TAG_ID);

            }

            for(int i = 0; i < idTwo.length(); i++){
                JSONObject iDeeTwo = idTwo.getJSONObject(i);

                //store each json item in variable
                secondID = iDeeTwo.getString(TAG_ID);
            }
            String creditURlBase = "http://api.themoviedb.org/3/person";

            String firstCreditURL = creditURlBase + firstID;
            String secondCreditURL = creditURlBase + secondID;

            JSONObject jSon = jParser.getJSONFromUrl(firstCreditURL);


            firstCast = jSon.getJSONArray(TAG_CAST);
            for(int i = 0; i < firstCast.length(); i++){
                JSONObject c = firstCast.getJSONObject(i);
                title = c.getString(TAG_TITLE);
                searchOneFilmography.add(title);
            }

            secondCast = jSon.getJSONArray(TAG_CAST);
            for(int i = 0; i < secondCast.length(); i++){
                JSONObject c = firstCast.getJSONObject(i);
                title = c.getString(TAG_TITLE);
                searchTwoFilmography.add(title);
            }

            //create hashmap
            HashMap<String, String> map = new HashMap<String, String>();

            Set hashset = new HashSet(searchOneFilmography);



            for(int i = 0; i < searchTwoFilmography.size(); i++){
                if(hashset.contains(searchTwoFilmography.get(i))){

                    map.put(TAG_TITLE, title);
                    commonFilmogrpahy.add(map);
                }

            }

            }
        catch(JSONException e){
            Log.e("Error", e.toString());
        }

        }


    }



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.totlayout, menu);
    return true;
}
}
4

1 回答 1

1

尝试像这样相交。

public <T> List<T> intersection(List<T> list1, List<T> list2) {
    List<T> list = new ArrayList<T>();

    for (T t : list1) {
        if(list2.contains(t)) {
            list.add(t);
        }
    }

    return list;
}

但是，您可能想通过 commonsware 使用 Endless Adapter，您可以在此处查看Android Endless Adapter

只要您不必等待输入，就可以在初始化将传递给 ListView 的 ArrayAdapter 之前将这两个相交。但是，如果您必须等待此类输入，则使用 asynctask 也可能是一个好主意:)

于 2012-09-10T08:16:01.700 回答