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

Question

我想解析json對象，但仍然出現錯誤。 這裏是MainActivity.java的代碼： 錯誤狀態。

致命異常：主 工藝：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

我曾在if語句（convertView！= NULL）這種錯誤條件（converView == NULL）

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


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

Answer 2

因此，首先你的JSON切換到此下面，爲簡單起見我不使用我的JSON的Url，我只是寫了確切的圖像名稱。

{ 
     "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." 
    } 

然後進入你的Adapter類並首先聲明這個;

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

然後再轉到getView()方法並修改它如下。

@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; 
    } 
}