Question

所以我试图将图像添加到我的列表视图中，但事实证明这是一种痛苦。我想使用Picasso，因为图像是通过HTTP请求的。

我目前只能在列表视图中将String对象添加到TextViews。这很容易。但是，我尝试按照以下方式尝试图像;

MainActivity.java

 ...                 
 HashMap<String, String> map = new HashMap<String, String>();

            map.put("name", name);
            map.put("title", title);
            map.put("image_url",IMAGE_RELATIVE_URL+image_url+".png");

            championList.add(map);

            // Get ListView object from xml
            final ListView listView = (ListView) findViewById(R.id.listView);

            ListAdapter adapter = new SimpleAdapter(MainActivity.this, championList, R.layout.list_view_row, new String[]{"name","title"}, new int[]{R.id.name, R.id.title});
            //ListAdapter adapter = new CustomList(MainActivity.this,new String[]{"name"}, new String[]{"title"}, new String[]{"image_url"})

            listView.setAdapter(adapter);

            listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    HashMap<String,String> map = (HashMap<String,String>)listView.getItemAtPosition(position);
                    String name= map.get("name");
                    String image= map.get("image_url");
                    Log.i("summoner",name+image);
                    //display in long period of time
                    Toast.makeText(getApplicationContext(), name, Toast.LENGTH_LONG).show();
                }
            });
 ...

CustomList.java

public class CustomList extends ArrayAdapter<String> {

private final Activity context;
private final String[] name;
private final String[] title;
private final String[] image_url;

public CustomList(Activity context, String[] name, String[] title, String[] image_url) {
    super(context, R.layout.list_view_row, name);
    this.context = context;
    this.name = name;
    this.title = title;
    this.image_url = image_url;

}

@Override
public View getView(int position, View view, ViewGroup parent) {
    LayoutInflater inflater = context.getLayoutInflater();
    View rowView= inflater.inflate(R.layout.list_view_row, null, true);
    TextView txtTitle = (TextView) rowView.findViewById(R.id.name);

    txtTitle.setText(name[position]);

    TextView txtName = (TextView) rowView.findViewById(R.id.title);

    txtName.setText(title[position]);

    ImageView imageView = (ImageView) rowView.findViewById(R.id.img);


    Picasso.with(this.context).load(image_url[position]).into(imageView);
    return rowView;
   }
}

将非常感谢帮助。

我哪里出错了？我迷路了，在苦涩的某个地方

Answer 1

修改适配器以扩展BaseAdapter。使用Picasso.with（this.context）.load（championList.get（position）.get（“image_url”））。into（imageView）加载图片。

Answer 2

所以一位同事通过修改我的CustomListView为我解决了这个问题。

public class CustomList extends SimpleAdapter {

private Context mContext;
public LayoutInflater inflater=null;
public CustomList(Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to) {
    super(context, data, resource, from, to);
    mContext = context;
    inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View vi=convertView;
    if(convertView==null)
        vi = inflater.inflate(R.layout.list_view_row, null);

    HashMap<String, Object> data = (HashMap<String, Object>) getItem(position);
    TextView text = (TextView)vi.findViewById(R.id.name);
    String name = (String) data.get("name");
    text.setText(name);
    ImageView image=(ImageView)vi.findViewById(R.id.img);
    String image_url = (String) data.get("image_url");
    Picasso.with(mContext).load(image_url).into(image);
    return vi;
   }
}

我从我的主要活动中调用它;

 ListAdapter adapter = new CustomList(MainActivity.this, championList, R.layout.list_view_row, new String[] {}, new int[] {});

使用具有Hashmap的自定义适配器将Picasso集成到列表视图中

2 个答案: