Question

先生，我在Android程序设计中非常非常棒。最近我试图从yts.arg创建api链接并尝试解析我的应用程序中的数据，以便我可以在我的应用程序中显示电影列表。我尝试了一切，但我总是得到这个异常org.json.JSONException：没有找到值.. 在下面，我正在添加一切，我需要帮助....我是新的堆栈溢出我尽我所能问一个gd问题.. 通过此活动，我正在调用我的片段：

package com.example.mehadi.pravashsirmat;

import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

import it.neokree.materialtabs.MaterialTab;
import it.neokree.materialtabs.MaterialTabHost;
import it.neokree.materialtabs.MaterialTabListener;

public class econd extends AppCompatActivity implements MaterialTabListener {
    Toolbar toolbar;
    MaterialTabHost materialTabHost;
    ViewPager viewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_econd);
        toolbar = (Toolbar) findViewById(R.id.ecotoolbar);
        setSupportActionBar(toolbar);
        //getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        materialTabHost = (MaterialTabHost) findViewById(R.id.materialTabHost);
        viewPager = (ViewPager) findViewById(R.id.viewpagerfreco);
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(adapter);
        viewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                materialTabHost.setSelectedNavigationItem(position);

            }
        });
        for (int i = 0; i < adapter.getCount(); i++) {
            materialTabHost.addTab(materialTabHost.newTab().setIcon(adapter.geticon(i)).setTabListener(this));
        }

    }

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


    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {

           // NavUtils.navigateUpFromSameTask(this);
            Intent intent=new Intent(this,MainActivity.class);
            startActivity(intent);
            finish();
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onTabSelected(MaterialTab tab) {
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabReselected(MaterialTab tab) {

    }

    @Override
    public void onTabUnselected(MaterialTab tab) {

    }

    private class ViewPagerAdapter extends FragmentStatePagerAdapter {
        public int[] pcons = {R.drawable.ic_account_circle_black_24dp1_user, R.drawable.ic_add_alert_black_24dp_alert, R.drawable.ic_home_black_24dp_home};

        public ViewPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            Fragment fragment = null;
            if (position == 0) {
                fragment = new Fragment_a();
            }
            if (position == 1) {
                fragment = new Fragment_b();
            }
            if (position == 2) {
                fragment = new Fragment_c();
            }
           // Myfragment myfragment=new Myfragment();

           // Myfragment myfragment=Myfragment.getInstance(position);
            //myfragment.getInstance(position);
            return fragment;
        }

        @Override
        public int getCount() {
            return 3;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return getResources().getStringArray(R.array.tabs)[position];
        }

        public Drawable geticon(int position) {
            return getResources().getDrawable(pcons[position]);
        }

    }
}

从这个片段我打电话给我的api：

package com.example.mehadi.pravashsirmat;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;

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

/**
 * Created by MEHADI on 8/5/2016.
 */
public class Fragment_a extends Fragment {

    TextView textView;


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View layout = inflater.inflate(R.layout.for_frag_a, container, false);
        textView = (TextView) layout.findViewById(R.id.textView_fr_a);
        RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, "https://yts.ag/api/v2/list_movies.json",
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        //Toast.makeText(getContext(), response.toString(), Toast.LENGTH_LONG).show();
                        //textView.setText(response.toString());
                        parseJasonresponse(response);
                    }

                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        });

        requestQueue.add(request);

        return layout;
    }

    public void parseJasonresponse(JSONObject response) {
        if (response == null || response.length() == 0) {
            return;
        }
        try {
          StringBuffer data = new StringBuffer();

            JSONObject arrayob = response.getJSONObject("data:");
            JSONArray arrayobfrmovies = arrayob.getJSONArray("movies:");
            for (int i = 0; i < arrayobfrmovies.length(); i++) {
                JSONObject currentmovies =arrayobfrmovies.getJSONObject(i);
                String Title = currentmovies.getString("title:");
                data.append(Title + "\n");
            }
            Toast.makeText(getContext(), data.toString(), Toast.LENGTH_LONG).show();


        } catch (JSONException e) {
            //Toast.makeText(getContext(), , Toast.LENGTH_LONG).show();
            textView.setText("Error=" + e);
            e.printStackTrace();
        }

    }
}

我还在为电影列表添加jason代码：

https://yts.ag/api/v2/list_movies.json

Answer 1

似乎JSON链接中的“数据”和“电影”和“标题”已发布。所以更改

“data：”with“data”和

“电影：”与“电影”和

“title：”with“title” 即改变

JSONObject arrayob = response.getJSONObject("data:");
            JSONArray arrayobfrmovies = arrayob.getJSONArray("movies:");
            for (int i = 0; i < arrayobfrmovies.length(); i++) {
                JSONObject currentmovies =arrayobfrmovies.getJSONObject(i);
                String Title = currentmovies.getString("title:");
                data.append(Title + "\n");
            }

带

JSONObject arrayob = response.getJSONObject("data");
            JSONArray arrayobfrmovies = arrayob.getJSONArray("movies");
            for (int i = 0; i < arrayobfrmovies.length(); i++) {
                JSONObject currentmovies =arrayobfrmovies.getJSONObject(i);
                String Title = currentmovies.getString("title");
                data.append(Title + "\n");
            }

Answer 2

替换此

JSONObject arrayob = response.getJSONObject("data:");
    JSONArray arrayobfrmovies = arrayob.getJSONArray("movies:");

带

JSONObject arrayob = response.getJSONObject("data");
    JSONArray arrayobfrmovies = arrayob.getJSONArray("movies");

从电影和数据中删除分号。您必须提供excat json对象名称

JSON数据未显示在我的应用中

2 个答案: