java.lang.OutOfMemoryError 在 com.mysamples.jsonparsingdemo2.MainActivity$MovieAdapter.getView(MainActivity.java:158)

Question

我正在尝试解析 json 对象，但仍然出现错误。 这是 MainActivity.java 中的代码： 错误状态。

致命异常：主要 进程：com.mysamples.jsonparsingdemo2，PID：2618 java.lang.OutOfMemoryError

package com.mysamples.jsonparsingdemo2;

import android.content.Context;
import android.os.AsyncTask;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RatingBar;
import android.widget.TextView;

import com.mysamples.jsonparsingdemo2.models.MovieModels;

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


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends ActionBarActivity {


    private ListView listView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    listView = (ListView)findViewById(R.id.listView);

        }




public class JSONTask extends AsyncTask<String,String,List<MovieModels>> {

    @Override
    protected List<MovieModels> doInBackground(String... urls) {
        HttpURLConnection httpURLConnection = null;
        BufferedReader reader = null;
        try {
            URL url = new URL(urls[0]);
            httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.connect();
            InputStream stream = httpURLConnection.getInputStream();
            reader = new BufferedReader(new InputStreamReader(stream));

            StringBuffer sBuffer = new StringBuffer();
            String line = "";
            while ((line = reader.readLine())!= null){
                sBuffer.append(line);
            }

            //Organizing the JSON object the JSON OBJECT
            String finalJson = sBuffer.toString();

            JSONObject parentObject = new JSONObject(finalJson);
            JSONArray parentArray = parentObject.getJSONArray("movies");

            //getting the objects from the url
            List<MovieModels> modelList = new ArrayList<>();
            for (int j = 0; j <parentArray.length() ; j++) {
                JSONObject finalObject = parentArray.getJSONObject(j);
                MovieModels models = new MovieModels();


                //Displaying the values from the url
                models.setMovie(finalObject.getString("movie"));
                models.setYear(finalObject.getInt("year"));
                models.setRating((float) finalObject.getDouble("rating"));
                models.setDirector(finalObject.getString("director"));
                models.setDuration(finalObject.getString("duration"));
                models.setTagline(finalObject.getString("tagline"));
                models.setImage(finalObject.getString("image"));
                models.setStory(finalObject.getString("story"));


                //getting the values from castList
                List<MovieModels.Cast> castList = new ArrayList<>();
                for (int i = 0; i <finalObject.getJSONArray("cast").length() ; i++) {
                    MovieModels.Cast cast = new MovieModels.Cast();
                    cast.setName(finalObject.getJSONArray("cast").getJSONObject(i).getString("name"));
                    castList.add(cast);
                }
                models.setCastList(castList);
                modelList.add(models);
            }

            return modelList;


        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        } finally {

            if (httpURLConnection!=null){
                httpURLConnection.disconnect();
            }
            try {
                if (reader!= null){
                    reader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return null;
    }

    @Override
    protected void onPostExecute(List<MovieModels> result) {
        super.onPostExecute(result);
        MovieAdapter movieAdapter = new MovieAdapter(getApplicationContext(), R.layout.custom_row, result);
        listView.setAdapter(movieAdapter);
    }
}

public class MovieAdapter extends ArrayAdapter{

    private List<MovieModels> modelList;
    private int resource;
    private LayoutInflater inflater;
    public MovieAdapter(Context context, int resource, List<MovieModels> objects) {
        super(context, resource,  objects);
        modelList = objects;
        this.resource = resource;
        inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);

    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView != null) {
            convertView = inflater.inflate(R.layout.custom_row,null);
        }

        //CASTING ALL THE VIEWS FROM THE CUSTOM_ROW LAYOUT
        ImageView imageView;
        TextView textViewMovie;
        TextView textViewYear;
        TextView textViewDuration;
        TextView textViewDirector;
        TextView textViewTagLine;
        TextView textViewCast;
        TextView textViewStory;
        RatingBar ratingBar;

        imageView = (ImageView)convertView.findViewById(R.id.imageView);
        textViewMovie = (TextView)convertView.findViewById(R.id.textViewMovie);
        textViewYear = (TextView)convertView.findViewById(R.id.textViewYear);
        textViewDuration =(TextView)convertView.findViewById(R.id.textViewDuration);
        textViewDirector = (TextView)convertView.findViewById(R.id.textViewDirector);
        textViewTagLine = (TextView)convertView.findViewById(R.id.textViewTagLine);
        textViewCast = (TextView)convertView.findViewById(R.id.textViewCast);
        textViewStory = (TextView)convertView.findViewById(R.id.textViewStory);
        ratingBar = (RatingBar)convertView.findViewById(R.id.ratingBarMovie);


        //DISPLAYING THE TEXT TO THE TEXTVIEWS
        textViewMovie.setText(modelList.get(position).getMovie());
        textViewYear.setText(String.valueOf(modelList.get(position).getYear()));
        textViewDuration.setText(modelList.get(position).getDuration());
        textViewDirector.setText(modelList.get(position).getDirector());
        textViewTagLine.setText(modelList.get(position).getTagline());

        //RATINGBAR
        ratingBar.setRating(modelList.get(position).getRating()/2);

        //GETTING THE CAST NAME FROM THE ARRAY
        StringBuffer castBuffer = new StringBuffer();
        for (MovieModels.Cast cast : modelList.get(position).getCastList()){
            castBuffer.append(cast.getName()+ ", ");
        }
        textViewCast.setText(castBuffer);
        textViewStory.setText(modelList.get(position).getStory());

        return convertView;
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_refresh) {
        new JSONTask().execute("http://jsonparsing.parseapp.com/jsonData/moviesData.txt");
    }

    return super.onOptionsItemSelected(item);
}

}

Answer 1

所以，首先将您的 JSON 更改为下面的内容，为简单起见，我不在 JSON 中使用 Urls，我只写了确切的图像名称。

{
      "movie": "Interstellar",
      "year": 2014,
      "rating": 8.7,
      "duration": "169 min",
      "director": "Christopher Nolan",
      "tagline": "Mankind was born on Earth. It was never meant to die here.",
      "cast": [
        {
          "name": "Matthew McConaughey"
        },
        {
          "name": "Anne Hathaway"
        },
        {
          "name": "Jessica Chastain"
        },
        {
          "name": "Wes Bentley"
        }
      ],
      "image": "interstellar.jpg",
      "story": "A team of explorers travel through a wormhole in space in an attempt to ensure humanity's survival."
    },
    {
      "movie": "Fantastic Four",
      "year": 2015,
      "rating": 4.0,
      "duration": "100 min",
      "director": "Josh Trank",
      "tagline": "Change is coming.",
      "cast": [
        {
          "name": "Miles Teller"
        },
        {
          "name": "Kate Mara"
        },
        {
          "name": "Michael B. Jordan"
        }
      ],
      "image": "four.jpg",
      "story": "Four young outsiders teleport to an alternate and dangerous universe which alters their physical form in shocking ways. The four must learn to harness their new abilities and work together to save Earth from a former friend turned enemy."
    }

然后进入你的 Adapter 类并首先声明这个；

private String url_load_images="http://jsonparsing.parseapp.com/jsonData/images/";

然后再去getView()方法修改如下。

@Override
    public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView != null) {
            convertView = inflater.inflate(R.layout.custom_row,null);
        }

        //CASTING ALL THE VIEWS FROM THE CUSTOM_ROW LAYOUT
        ImageView imageView;
        TextView textViewMovie;
        TextView textViewYear;
        TextView textViewDuration;
        TextView textViewDirector;
        TextView textViewTagLine;
        TextView textViewCast;
        TextView textViewStory;
        RatingBar ratingBar;

        imageView = (ImageView)convertView.findViewById(R.id.imageView);
        textViewMovie = (TextView)convertView.findViewById(R.id.textViewMovie);
        textViewYear = (TextView)convertView.findViewById(R.id.textViewYear);
        textViewDuration =(TextView)convertView.findViewById(R.id.textViewDuration);
        textViewDirector = (TextView)convertView.findViewById(R.id.textViewDirector);
        textViewTagLine = (TextView)convertView.findViewById(R.id.textViewTagLine);
        textViewCast = (TextView)convertView.findViewById(R.id.textViewCast);
        textViewStory = (TextView)convertView.findViewById(R.id.textViewStory);
        ratingBar = (RatingBar)convertView.findViewById(R.id.ratingBarMovie);


        //DISPLAYING THE TEXT TO THE TEXTVIEWS
        textViewMovie.setText(modelList.get(position).getMovie());
        textViewYear.setText(String.valueOf(modelList.get(position).getYear()));
        textViewDuration.setText(modelList.get(position).getDuration());
        textViewDirector.setText(modelList.get(position).getDirector());
        textViewTagLine.setText(modelList.get(position).getTagline());

        //RATINGBAR
        ratingBar.setRating(modelList.get(position).getRating()/2);

        //GETTING THE CAST NAME FROM THE ARRAY
        StringBuffer castBuffer = new StringBuffer();
        for (MovieModels.Cast cast : modelList.get(position).getCastList()){
            castBuffer.append(cast.getName()+ ", ");
        }
        textViewCast.setText(castBuffer);
        textViewStory.setText(modelList.get(position).getStory());



final MovieModels models = modelList.get(position);
    Picasso.with(context)
        .load(url_load_images+models.getImage)
        .placeholder(R.drawable.user_placeholder)
        .error(R.drawable.user_placeholder_error)
        .into(imageView);

        return convertView;
    }
}

Answer 2

我在 if 语句 (convertView != null) 到 (converView == null) 中遇到了这种错误情况

@Override
public View getView(int position, View convertView, ViewGroup parent) {


    if (convertView == null) {
        convertView = inflater.inflate(R.layout.custom_row,null);
    }