Question

我正在尝试创建一个解析来自JSON解析器的数据的应用程序，并使用recyclerview中的数据提取来填充JSON项目，但每当我运行它时它只会冻结在加载并显示没有错误，除了适配器没有附加跳过布局。我陷入了死胡同，因为我无法继续下去。我该如何解决这个代码的问题。

MainActivity

public class MainActivity extends AppCompatActivity {
    CollapsingToolbarLayout collapsingToolbarLayout;
    ImageView image;
    TextView personName;
    TextView personProf;
    RecyclerView rv;
    private List<Person> personList;
    private RecyclerView.LayoutManager layoutManager;
    private RecyclerView.Adapter adapter;
    ImageView images;
    RecyclerViewHeader header;
    ImageView iv;

    public String strurl;
    URL url;
    URI uri;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        personName= (TextView)findViewById(R.id.textView);
        personProf=(TextView)findViewById(R.id.textView2);
        images= (ImageView)findViewById(R.id.imageView);
        setSupportActionBar((Toolbar) findViewById(R.id.toolbar));

        collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
        collapsingToolbarLayout.setTitle("Capsule");
        collapsingToolbarLayout.setExpandedTitleColor(getResources().getColor(android.R.color.transparent));
        //setPalette();
        strurl =  "http://www.humanfox.com/capsule/assets/img/jawed_headshot.jpg";

        Typeface face2 = Typeface.createFromAsset(getAssets(),"fonts/OpenSans-Regular.ttf");
        Typeface face4= Typeface.createFromAsset(getAssets(),"fonts/OpenSans-Bold.ttf");

        image = (ImageView) findViewById(R.id.image);
        Picasso.with(this)
                .load("http://d152j5tfobgaot.cloudfront.net/wp-content/uploads/2013/06/Javed-Habib_11.jpg")
                .into(image);
        //header = (RecyclerViewHeader) findViewById(R.id.header);
        //header.attachTo(rv,true);

        rv =(RecyclerView)findViewById(R.id.rv);
        rv.setHasFixedSize(true);

        LinearLayoutManager llm = new LinearLayoutManager(this);
        rv.setLayoutManager(llm);

       personList= new ArrayList<>();
       getData();
    }
    private void getData(){
        //Showing a progress dialog
        final ProgressDialog loading = ProgressDialog.show(this,"Loading Data", "Please wait...",false,false);

        //Creating a json array request
        JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(COnfig.DATA_URL,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        //Dismissing progress dialog
                        loading.dismiss();

                        //calling method to parse json array
                        parseData(response);
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {

                    }
                });

        //Creating request queue
        RequestQueue requestQueue = Volley.newRequestQueue(this);

        //Adding request to the queue
        requestQueue.add(jsonArrayRequest);
    }

    private void parseData(JSONArray array) {
        for (int i = 0; i < array.length(); i++) {
            Person per = new Person();
            JSONObject json = null;
            try {
                json = array.getJSONObject(i);
                per.setImageUrl(json.getString(COnfig.TAG_IMAGE_URL));
                per.setName(json.getString(COnfig.TAG_NAME));
                per.setPassion(json.getString(COnfig.TAG_PROFESSION));
            } catch (JSONException e) {
                e.printStackTrace();

            }
            personList.add(per);
        }
        adapter = new RVAdapter(personList, this);
        rv.setAdapter(adapter);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    }


}

Recycler view Adapter

public class RVAdapter extends RecyclerView.Adapter<RVAdapter.PersonViewHolder> {

        private ImageLoader imageLoader;
        Context context;
        private List<Person> persons;

        RVAdapter(List<Person> persons,Context context){
            this.persons = persons;
            this.context = context;
        }

        @Override
        public PersonViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
            View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item,viewGroup,false);
            PersonViewHolder pvh = new PersonViewHolder(v);
            return pvh;
        }

        @Override
        public void onBindViewHolder(PersonViewHolder personViewHolder, int i) {
            imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
            imageLoader.get(persons.get(i).getImageUrl(), ImageLoader.getImageListener(personViewHolder.personPhoto, R.drawable.ic_launcher, android.R.drawable.ic_dialog_alert));
            personViewHolder.personName.setText(persons.get(i).getName());
            personViewHolder.personProf.setText(persons.get(i).getPassion());


        }

        @Override
        public void onAttachedToRecyclerView(RecyclerView recyclerView) {
            super.onAttachedToRecyclerView(recyclerView);
        }




        @Override
        public int getItemCount() {
            return persons.size();
           }

        public static class PersonViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
            CardView cv;
            TextView personName;
            TextView personProf;
            ImageView personPhoto;
            Context context;

             PersonViewHolder(final View itemView) {
                super(itemView);
                context = itemView.getContext();
                itemView.setClickable(true);
                itemView.setOnClickListener(this);

                cv = (CardView) itemView.findViewById(R.id.cv);
                personName = (TextView) itemView.findViewById(R.id.textView);
                personProf = (TextView) itemView.findViewById(R.id.textView2);
                personPhoto=(ImageView) itemView.findViewById(R.id.imageView);
            }

            @Override
            public void onClick(View view) {
                final Intent intent;
                int position =getAdapterPosition();
                switch(position){
                    case 0:
                        context.startActivity(new Intent(context,caps1.class));

                }
            }
        }


    }

自定义排球请求

public class CustomVolleyRequest {
    private static CustomVolleyRequest customVolleyRequest;
    private static Context context;
    private RequestQueue requestQueue;
    private ImageLoader imageLoader;

    private CustomVolleyRequest(Context context) {
        this.context = context;
        this.requestQueue = getRequestQueue();

        imageLoader = new ImageLoader(requestQueue,
                new ImageLoader.ImageCache() {
                    private final LruCache<String, Bitmap>
                            cache = new LruCache<String, Bitmap>(20);

                    @Override
                    public Bitmap getBitmap(String url) {
                        return cache.get(url);
                    }

                    @Override
                    public void putBitmap(String url, Bitmap bitmap) {
                        cache.put(url, bitmap);
                    }
                });
    }

    public static synchronized CustomVolleyRequest getInstance(Context context) {
        if (customVolleyRequest == null) {
            customVolleyRequest = new CustomVolleyRequest(context);
        }
        return customVolleyRequest;
    }

    public RequestQueue getRequestQueue() {
        if (requestQueue == null) {
            Cache cache = new DiskBasedCache(context.getCacheDir(), 10 * 1024 * 1024);
            Network network = new BasicNetwork(new HurlStack());
            requestQueue = new RequestQueue(cache, network);
            requestQueue.start();
        }
        return requestQueue;
    }

    public ImageLoader getImageLoader() {
        return imageLoader;
    }
}

Answer 1

确保已在后台线程上实现了发送请求和解析json，而不是在主线程中。否则，它会冻结，因为你的主线程可以做一个任务，并且应该做UI更新而不是所有任务。

JSON解析器应用程序在运行时冻结

1 个答案: