Question

使用Picasso依赖项获取图像时遇到此问题。但当我获取其他字符串时，它们会显示在我的Android应用程序上。这是我的代码：

ListAdapter.java

 public class ListAdapter extends ArrayAdapter<Restaurant> {
    public ListAdapter(Context context, int resource) {
        super(context, resource);
    }
    @Override
    public View getView(int position,View convertView, ViewGroup parent){
        ViewHolder holder;
        if (convertView == null){
            holder = new ViewHolder();
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.fragment_list,parent,false);
            holder.name = (TextView)convertView.findViewById(R.id.name);
            holder.type = (TextView)convertView.findViewById(R.id.type);
            holder.thumbnail = (ImageView)convertView.findViewById(R.id.thumbnail);

            convertView.setTag(holder);
        }else{
            holder = (ViewHolder)convertView.getTag();
        }


        holder.name.setText(getItem(position).getName());
        holder.type.setText(getItem(position).getType());
        Picasso.with(getContext()).load(getItem(position).getThumbnail()).into(holder.thumbnail);

        return convertView;
    }
    class ViewHolder{
        ImageView thumbnail;
        TextView name;
        TextView type;
    }
}

当我将getItem（位置）.getThumbnail（）更改为＆＃34; http://some_image_here.png＆＃34;我可以看到这张照片。

Restaurant.java

 public class Restaurant implements Parcelable {
    private String name;
    private String type;
    private String description;
    private String thumbnail;
    private String image;

    public Restaurant(){

    }
    public Restaurant(String name, String type, String description, String thumbnail, String image){
        this.name = name;
        this.type = type;
        this.description = description;
        this.thumbnail = thumbnail;
        this.image = image;
    }
    public  Restaurant(Parcel source){
        name = source.readString();
        type = source.readString();
        description = source.readString();
        thumbnail = source.readString();
        image = source.readString();
    }
    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public String getThumbnail() {
        return thumbnail;
    }

    public void setThumbnail(String thumbnail) {

        this.thumbnail = thumbnail;
    }

    public String getDescription() {

        return description;
    }

    public void setDescription(String description) {

        this.description = description;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        applyDefaultValues();

        dest.writeString(name);
        dest.writeString(type);
        dest.writeString(description);
        dest.writeString(image);
        dest.writeString(thumbnail);
    }

    private void applyDefaultValues() {
        if(name == null)
            name="";
        if(type == null)
            type ="";
        if(description == null)
            description = "";
        if(image == null)
            image = "";
        if(thumbnail == null)
            thumbnail = "";
    }
    public static Creator<Restaurant>CREATOR = new Creator<Restaurant>() {
        @Override
        public Restaurant createFromParcel(Parcel source) {

            return new Restaurant(source);
        }

        @Override
        public Restaurant[] newArray(int size) {

            return new Restaurant[size];
        }
    };
}

这是我的fragment_list.xml

的代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
tools:context="com.findmerest.fragment.ListRestFragment">

<ImageView
    android:id="@+id/thumbnail"
    android:layout_width="64dp"
    android:layout_height="64dp"/>

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/name"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"/>

    <TextView
        android:id="@+id/type"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

有人可以告诉我代码中的错误吗？

我包含ListRestFragment：

public class ListRestFragment extends ListFragment {

private ListAdapter mAdapter;
public static ListRestFragment getInstance(){
    ListRestFragment fragment = new ListRestFragment();
    return fragment;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState){
    super.onActivityCreated(savedInstanceState);

    setListShown(false);
    mAdapter = new ListAdapter(getActivity(),0);

    RestAdapter adapter = new RestAdapter.Builder()
            .setEndpoint(getString(R.string.restaurant_list))
            .build();
    RestaurantApiInterface restaurantApiInterface = adapter.create(RestaurantApiInterface.class);
    restaurantApiInterface.getStreams(new Callback<List<Restaurant>>() {
        @Override
        public void success(List<Restaurant> restaurants, Response response) {
            if (restaurants == null || restaurants.isEmpty()) {
                return;
            }
            for (Restaurant restaurant : restaurants) {
                mAdapter.add(restaurant);
            }
            mAdapter.notifyDataSetChanged();
            setListAdapter(mAdapter);
            setListShown(true);
        }

        @Override
        public void failure(RetrofitError error) {
            Log.e("Restaurant", "error" + error.getMessage());
        }
    });
}

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    Intent intent = new Intent(getActivity(), ListRestDetailActivity.class);
    intent.putExtra(ListRestDetailActivity.EXTRA_RESTAURANT,mAdapter.getItem(position));

    startActivity(intent);
}

}

餐厅名单：

 <string name="restaurant_list">https://gist.githubusercontent.com/jayGorio/23fed06b792dd59ccc60/raw/ba7e3943c01703f032692b363088be519e022399</string>

Answer 1

试一试：

Picasso.with(getContext())
       .load(new File(getItem(position).getThumbnail()))
       .into(holder.thumbnail);

Answer 2

只需使用Log.d（＆＃34; ImageUrl＆＃34;，getItem（position）.getThumbnail（）。toString（））并查看Log to get如果它返回有效或无效的URL。

：d

在Android中使用Picasso无法显示图像

2 个答案: