Question

我已经阅读了几篇有类似问题的帖子，但我还是无法修复。我正在尝试构建的应用程序应该从链接中检索图像并显示它们。这是通过Picasso完成的，并且应该以GridView格式显示。

这是我的MovieAdapter.java：

    package com.example.android.popularmovies.utilities;

    import android.app.Activity;

    import android.content.Context;
    import android.support.annotation.Nullable;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ArrayAdapter;
    import android.widget.ImageView;

    import com.example.android.popularmovies.R;
    import com.squareup.picasso.Picasso;

    import java.util.ArrayList;
    /**
     * Created by Jonathan on 6/18/2017.
     */

    public class MovieAdapter extends ArrayAdapter<String>{
        Context mContext;
        int mLayoutResourceId;
        ArrayList<String> mData = new ArrayList<>();

    public MovieAdapter(Context context, int layoutResourceId,
                                 ArrayList<String> data) {
        super(context, layoutResourceId, data);
        mLayoutResourceId = layoutResourceId;
        mContext = context;
        mData = data;
    }

    public void setData(ArrayList<String> mGridData) {
        mData=mGridData;
        notifyDataSetChanged();
    }

    //TODO code is working. Posters arent displayed :(
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
        convertView = inflater.inflate(mLayoutResourceId, parent, false);
        ImageView image = (ImageView) convertView.findViewById(R.id.iv_moviePoster);
        convertView.setTag(image);
        try {
            String poster = NetworkUtils.posterBuilder(mData.get(position));

            Picasso.with(mContext).
                    load(poster).
                    into(image);
        }
        catch(NullPointerException e) { e.printStackTrace(); }
        return image;
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Nullable
    @Override
    public String getItem(int position) {
        return mData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }
}

运行代码时，不显示任何内容。请帮忙，谢谢

更新 activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <ImageView
        android:id="@+id/iv_moviePoster"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <GridView xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/gv_movieData"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:columnWidth="100dp"
            android:numColumns="2"
            android:verticalSpacing="10dp"
            android:horizontalSpacing="10dp"
            android:stretchMode="columnWidth"
            android:gravity="center" />
    <ProgressBar
        android:id="@+id/pb_loadingBar"
        android:layout_width="42dp"
        android:layout_height="42dp"
        android:layout_gravity="center"
        android:visibility="invisible"/>
</LinearLayout>

权限：

<uses-permission android:name="android.permission.INTERNET"/>

毕加索没有在GridView中显示图像

0 个答案: