Android 单击项目时，图像不会显示在详细活动上

我正在使用截击库进行网络连接。当我点击列表中的一个项目时，我试图将图像加载到下一个屏幕上。在XML文件中，我使用“NetworkImageView”保存图像。我使用intent在描述页面中传递视图

提前谢谢

代码如下：

列出活动 此活动显示存储在数据库中的项目列表

public class HallListActivity extends AppCompatActivity
    implements SearchView.OnQueryTextListener, AdapterView.OnItemClickListener {

// Log tag
private static final String TAG = HallListActivity.class.getSimpleName();

// Movies json url
private static final String url = "http://10.0.2.2/wedding1/halls.php";
private ProgressDialog progressDialog;
private List<Hall> hallList = new ArrayList<Hall>();
private ListView listView;
private HallAdapter adapter;
private Hall h;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_hall_list);
    getSupportActionBar().setTitle("List of Halls");

    listView = (ListView) findViewById(R.id.list);
    adapter = new HallAdapter(this, hallList);
    listView.setAdapter(adapter);

    listView.setOnItemClickListener(this);

    // Create a new progress dialog
    progressDialog = new ProgressDialog(this);
    // Showing progress dialog before making http request
    progressDialog.setMessage("Loading...");
    progressDialog.show();


    // Creating volley request obj
    //String url = "http://10.0.2.2/wedding1/";
    JsonArrayRequest hallReq = new JsonArrayRequest(url, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response) {
            // Parsing json
            for (int i = 0; i < response.length(); i++) {
                try {
                    JSONObject obj = response.getJSONObject(i);
                    Hall hall = new Hall();
                    hall.setThumbnailUrl(obj.getString("image"));
                    hall.setTitle(obj.getString("name"));
                    hall.setDescription(obj.getString("description"));
                    hall.setLocation(obj.getString("location"));
                    hall.setPrice(obj.getString("price"));

                    // adding hall to movies array
                    hallList.add(hall);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }

            progressDialog.dismiss(); // progress bar disappears once the halls are loaded on screen

            /* notifying list adapter about data changes so that it renders the list view with updated data */
            adapter.notifyDataSetChanged();
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            VolleyLog.d(TAG, "Error: " + error.getMessage());
            hideProgressDialog();
        }
    });

    // Adding request to request queue
    MySingleton.getInstance().addToRequestQueue(hallReq);

}

@Override
public void onDestroy() {
    super.onDestroy();
    hideProgressDialog();
}

private void hideProgressDialog() {
    if (progressDialog != null) {
        progressDialog.dismiss();
        progressDialog = null;
    }
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.refresh:
            startActivity(new Intent(getApplicationContext(), HallListActivity.class));
            break;
    }
    return true;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu, menu);
    MenuItem menuItem = menu.findItem(R.id.action_search);
    SearchView searchView = (SearchView) MenuItemCompat.getActionView(menuItem);
    searchView.setOnQueryTextListener(this); // The onQueryTextChange method will invoke
    return true;
}

@Override
public boolean onQueryTextSubmit(String query) {

    return false;
}

@Override
public boolean onQueryTextChange(String newText) {
    newText = newText.toLowerCase();
    ArrayList<Hall> newList = new ArrayList<>();
    for (Hall hall : hallList) {
        String name = hall.getTitle().toLowerCase();
        if (name.contains(newText))
            newList.add(hall);
    }
    return true;
}


@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    h = hallList.get(position);
    // shows the hall name at the bottom once the hall is clicked
    Toast.makeText(HallListActivity.this, h.getTitle(), Toast.LENGTH_SHORT).show();
    Intent intentDescription = new Intent(HallListActivity.this, HallDescriptionActivity.class);

    Log.d(TAG, "onItemClick: title " + h.getTitle());

    intentDescription.putExtra("title", h.getTitle());
    intentDescription.putExtra("image", h.getThumbnailUrl());
    intentDescription.putExtra("description", h.getDescription());
    intentDescription.putExtra("location", h.getLocation());
    intentDescription.putExtra("price", String.valueOf(h.getPrice()));

    intentDescription.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intentDescription);

}
}

适配器类

public class HallAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Hall> hallItems;
ImageLoader imageLoader = MySingleton.getInstance().getImageLoader();

public HallAdapter(Activity activity, List<Hall> hallItems) {
    this.activity = activity;
    this.hallItems = hallItems;
}

// Lets tge ListView know how many items to display (returns the size of the data source
@Override
public int getCount() {
    return hallItems.size();
}

// returns an item to be placed in a given position of the data source
@Override
public Object getItem(int position) {
    return hallItems.get(position);
}

// defines a unique ID for each row in the list
// Use the position of the item as its ID for simplicity
@Override
public long getItemId(int position) {
    return position;
}

// Creates the view to be used as a row in the list.
// Defining the information and where it is placed in the ListView.
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (inflater == null)
        inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    if (convertView == null)
        convertView = inflater.inflate(R.layout.list_item, null);

    // image loader is used to check if the permissions are granted or not
    if (imageLoader == null)
        imageLoader = MySingleton.getInstance().getImageLoader();

    // Thumbnail
    NetworkImageView thumbnail = (NetworkImageView) convertView.findViewById(R.id.thumbnail);
    // Hall name
    TextView title = (TextView) convertView.findViewById(R.id.title);
    // Rating
    TextView description = (TextView) convertView.findViewById(R.id.description);
    // genre
    TextView location = (TextView) convertView.findViewById(R.id.location);
    // year
    TextView price = (TextView) convertView.findViewById(R.id.price);

    // getting hall data for each row
    //Hall h = hallItems.get(position);
    Hall h = (Hall) getItem(position);
    // Thumbnail image
    String url = "http://10.0.2.2/wedding1/";
    thumbnail.setImageUrl(url + h.getThumbnailUrl(), imageLoader);
    // Title
    title.setText(h.getTitle());
    // Description
    description.setText(String.valueOf(h.getDescription()));
    // Location
    location.setText(String.valueOf(h.getLocation()));
    // Price
    price.setText("£" + String.valueOf(h.getPrice()));

    return convertView;
}
}

公共类HallAdapter扩展了BaseAdapter{
私人活动；
私人充气机；
私人物品清单；
ImageLoader ImageLoader=MySingleton.getInstance（）.getImageLoader（）；
公共HallAdapter（活动、列表项）{
这个。活动=活动；
this.hallItems=hallItems；
}
//让tge ListView知道要显示多少项（返回数据源的大小
@凌驾
public int getCount（）{
返回hallItems.size（）；
}
//返回要放置在数据源给定位置的项
@凌驾
公共对象getItem（int位置）{
返回项目。获取（位置）；
}
//为列表中的每一行定义唯一的ID
//为简单起见，请使用项目的位置作为其ID
@凌驾
公共长getItemId（int位置）{
返回位置；
}
//创建要用作列表中的行的视图。
//定义信息及其在ListView中的位置。
@凌驾
公共视图getView（int位置、视图转换视图、视图组父视图）{
如果（充气器==null）
充气器=（LayoutInflater）activity.getSystemService（Context.LAYOUT\u充气器\u SERVICE）；
if（convertView==null）
convertView=充气机。充气（R.layout.list_项，空）；
//图像加载器用于检查是否授予了权限
如果（imageLoader==null）
imageLoader=MySingleton.getInstance（）.getImageLoader（）；
//缩略图
NetworkImageView缩略图=（NetworkImageView）convertView.findViewById（R.id.缩略图）；
//厅名
TextView title=（TextView）convertView.findViewById（R.id.title）；
//评级
TextView description=（TextView）convertView.findViewById（R.id.description）；
//体裁
TextView位置=（TextView）convertView.findViewById（R.id.location）；
//年
TextView价格=（TextView）convertView.findViewById（R.id.price）；
//获取每行的霍尔数据
//霍尔h=霍尔项目。获取（位置）；
大厅h=（大厅）获取项目（位置）；
//缩略图像
字符串url=”http://10.0.2.2/wedding1/";
setImageUrl（url+h.getThumbnailUrl（），imageLoader）；
//头衔
title.setText（h.getTitle（））；
//描述
description.setText（String.valueOf（h.getDescription（））；
//位置
location.setText（String.valueOf（h.getLocation（））；
//价格
price.setText（“£”+String.valueOf（h.getPrice（））；
返回视图；
}
}

试试这个 -我认为您正在将图像作为url获取，如果是这样，请将其保存在arraylist中。 -使arraylist为静态，以便可以在任何活动中调用相同的arraylist

---

-在activity u like中使用毕加索图像加载程序。

我怀疑

onCreate（）的try…catch块中引发了异常

详细信息活动的方法。由于您手动打印stacktrace，您的应用程序不会崩溃。在执行此操作时，您需要小心，因为异常可能会使您的程序处于不稳定状态。在这种情况下，崩溃要比继续运行代码并产生不良结果要好得多。您需要更仔细地考虑您的异常n处理。话虽如此，请在此处张贴stacktrace，以便我们能进一步帮助您。

public class HallAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Hall> hallItems;
ImageLoader imageLoader = MySingleton.getInstance().getImageLoader();

public HallAdapter(Activity activity, List<Hall> hallItems) {
    this.activity = activity;
    this.hallItems = hallItems;
}

// Lets tge ListView know how many items to display (returns the size of the data source
@Override
public int getCount() {
    return hallItems.size();
}

// returns an item to be placed in a given position of the data source
@Override
public Object getItem(int position) {
    return hallItems.get(position);
}

// defines a unique ID for each row in the list
// Use the position of the item as its ID for simplicity
@Override
public long getItemId(int position) {
    return position;
}

// Creates the view to be used as a row in the list.
// Defining the information and where it is placed in the ListView.
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (inflater == null)
        inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    if (convertView == null)
        convertView = inflater.inflate(R.layout.list_item, null);

    // image loader is used to check if the permissions are granted or not
    if (imageLoader == null)
        imageLoader = MySingleton.getInstance().getImageLoader();

    // Thumbnail
    NetworkImageView thumbnail = (NetworkImageView) convertView.findViewById(R.id.thumbnail);
    // Hall name
    TextView title = (TextView) convertView.findViewById(R.id.title);
    // Rating
    TextView description = (TextView) convertView.findViewById(R.id.description);
    // genre
    TextView location = (TextView) convertView.findViewById(R.id.location);
    // year
    TextView price = (TextView) convertView.findViewById(R.id.price);

    // getting hall data for each row
    //Hall h = hallItems.get(position);
    Hall h = (Hall) getItem(position);
    // Thumbnail image
    String url = "http://10.0.2.2/wedding1/";
    thumbnail.setImageUrl(url + h.getThumbnailUrl(), imageLoader);
    // Title
    title.setText(h.getTitle());
    // Description
    description.setText(String.valueOf(h.getDescription()));
    // Location
    location.setText(String.valueOf(h.getLocation()));
    // Price
    price.setText("£" + String.valueOf(h.getPrice()));

    return convertView;
}
}