Question

我目前正在尝试将图像集成到当前字符串的对象中。但是，图像是在api中与其余字符串同时返回的url。因此需要检索图像，并将其传递到对象中，以便适配器填充列表视图中的图像视图。对不起，如果那令人困惑！

ListViewLoader如下：

   private class ListViewLoaderTask extends AsyncTask<String, Void, SimpleAdapter> {

    JSONObject jObject;
    /** Doing the parsing of xml data in a non-ui thread */
    @Override
    protected SimpleAdapter doInBackground(String... strJson) {
        List<HashMap<String, String>> properties = null;

        try{
            PropertiesParser propertiesParser = new PropertiesParser();
            jObject = new JSONObject(strJson[0]);

            /** Getting the parsed data as a List construct */
            properties = propertiesParser.parse(jObject);
        }catch(Exception e) {
            Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_LONG).show();
        }

        /** Keys used in Hashmap */
        String[] from = { "image", "numBedrooms","propertyType","marketingStatus","price","applicationStatus","displayableAddress","listingId"};

        /** Ids of views in listview_layout */
        int[] to = { R.id.image, R.id.numBedrooms, R.id.propertyType, R.id.marketingStatus, R.id.price, R.id.applicationStatus, R.id.displayableAddress, R.id.listingId};

        Log.d(TAG, properties.toString());
        /**
         *  Instantiating an adapter to store each item
         *  R.layout.listview_layout defines the layout of each item
         */
        SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), properties, R.layout.properties_layout, from, to);

        return adapter;
    }

    /** Invoked by the Android system on "doInBackground" is executed completely */
    /** This will be executed in ui thread */
    @Override
    protected void onPostExecute(SimpleAdapter adapter) {

        /** Getting a reference to listview of main.xml layout file */
        ListView listView = ( ListView ) findViewById(R.id.listView1);

        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new ListClickHandler());

        InputMethodManager imm = (InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE);
        imm.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0);
    }
}

属性解析器如下：

import android.util.Log;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;


public class PropertiesParser {
    private static final String TAG = PropertiesParser.class.getSimpleName();

    /** Receives a JSONObject and returns a list */
    public List<HashMap<String,String>> parse(JSONObject jObject){

        JSONObject jembedded = null;
        JSONArray jProperties = null;

        try {
            // Retrieves all the elements in the '_embedded' array
            jembedded = jObject.getJSONObject("_embedded");
            jProperties = jembedded.getJSONArray("items");
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return getProperties(jProperties);
    }

    private List<HashMap<String, String>> getProperties(JSONArray jProperties){
        int propertyCount = jProperties.length();
        List<HashMap<String, String>> propertyList = new ArrayList<HashMap<String,String>>();
        HashMap<String, String> property = null;

        /** Taking each property, parses and adds to list object */
        for(int i=0; i<propertyCount;i++){
            try {
                /** Call getProperty with property JSON object to parse the property */
                property = getProperty((JSONObject)jProperties.get(i));
                propertyList.add(property);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }

        return propertyList;
    }

    /** Parsing the Property JSON object */
    private HashMap<String, String> getProperty(JSONObject jProperty) {

        HashMap<String, String> property = new HashMap<String, String>();
        String applicationStatus = "";
        String marketingStatus = "";

        String numBedrooms = "";
        String propertyType = "";
        String price = "";
        String displayableAddress = "";
        String listingId = "";

        JSONObject revisions = null;
        JSONObject currentRevision = null;
        JSONObject extra = null;
        JSONObject address = null;

        try {
            // Populate details into array..
            listingId = jProperty.getString("id");
            applicationStatus = jProperty.getString("application_status");
            marketingStatus = jProperty.getString("marketing_status");

            revisions = jProperty.getJSONObject("_embedded");
            currentRevision = revisions.getJSONObject("current_revision");
            extra = currentRevision.getJSONObject("_embedded");
            address = extra.getJSONObject("address");

            numBedrooms = currentRevision.getString("number_of_beds");
            propertyType = currentRevision.getString("property_type");
            price = currentRevision.getString("price");

            displayableAddress = address.getString("line_one") + ", " + address.getString("post_code");

            property.put("listingId", listingId);
            property.put("applicationStatus", applicationStatus);
            property.put("marketingStatus", marketingStatus);
            property.put("numBedrooms", numBedrooms + " bedroom(s)");
            property.put("propertyType", propertyType);
            property.put("price", price);
            property.put("displayableAddress", displayableAddress);

            Log.d(TAG, property.toString());
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return property;
    }
}

我尝试在下面的链接中集成教程，但是无法弄清楚如何将它与适配器一起使用： https://codingsec.net/2016/04/load-image-internet-android/

对不起，如果需要进一步的信息，请告诉我。

Answer 1

您可以传递适配器中的字符串并使用picasso库，如下所示：

Picasso.with(context).load(yourStringUrl).into(imageView);

填充图片视图。

ListView中的位图imageview

1 个答案: