Question

我正在使用Picasso库在GridView中加载图像。这是我的代码。首先我有一个包含String数组链接的类。为了实验目的，我使用相同的图像。

  public class Data {

  static final String[] URLS = {
    "http://www.panoramio.com/photo/116726502",
    "http://www.panoramio.com/photo/116726502",
    "http://www.panoramio.com/photo/116726502",
    "http://www.panoramio.com/photo/116726502",
    "http://www.panoramio.com/photo/116726502",
    "http://www.panoramio.com/photo/116726502",
    "http://www.panoramio.com/photo/116726502",

 };

  private Data() {
 // No instances.
 }
}

接下来，我有MainActivity类，它可以执行常规操作，即初始化GridView等。

public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    GridView gv = (GridView) findViewById(R.id.grid_view);
    gv.setAdapter(new SampleGridViewAdapter(this));
    gv.setOnScrollListener(new SampleScrollListener(this));

  }

}

最后我有我创建的GridViewAdapter。

final class SampleGridViewAdapter extends BaseAdapter {
private final Context context;
private final List<String> urls = new ArrayList<String>();

public SampleGridViewAdapter(Context context) {
    this.context = context;

    // Ensure we get a different ordering of images on each run.
    Collections.addAll(urls, Data.URLS);
    Collections.shuffle(urls);

    // Triple up the list.
    ArrayList<String> copy = new ArrayList<String>(urls);
    urls.addAll(copy);
    urls.addAll(copy);
 }


@Override public View getView(int position, View convertView, ViewGroup   
parent)   {
    SquaredImageView view = (SquaredImageView) convertView;
    if (view == null) {
        view = new SquaredImageView(context);
        view.setScaleType(CENTER_CROP);
    }

    // Get the image URL for the current position.
    String url = getItem(position);

    // Trigger the download of the URL asynchronously into the image view.
    Picasso.with(context) //
            .load(url) //
            .placeholder(R.drawable.placeholder) //
            .error(R.drawable.error) //
            .fit() //
            .tag(context) //
            .into(view);

    return view;
}

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

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

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

Answer 1

您传递的网址不是实际的图片网址，而是网页。

我检查并提取了其中一个网址的图片网址。使用它会起作用。 http://static.panoramio.com/photos/large/116726502.jpg

确保在应用中加载图片时有实际的图片网址

Answer 2

您可以尝试将网址更改为真实的照片网址

e.g。

http://static.panoramio.com/photos/large/116726502.jpg

Answer 3

您的网址数组不正确..请检查并制作有效的网址数组。那个数组可能就像..

static final String[] URLS = {
    "http://www.panoramio.com/photo/116726502.jpg",
    "http://www.panoramio.com/photo/116726502.jpg",
    "http://www.panoramio.com/photo/116726502.jpg",
    "http://www.panoramio.com/photo/116726502.jpg",
    "http://www.panoramio.com/photo/116726502.jpg",
    "http://www.panoramio.com/photo/116726502.jpg",
    "http://www.panoramio.com/photo/116726502.jpg",

 };

  private Data() {
 // No instances.
 }
}

Answer 4

确定。我找到了一些时间来解决这个问题。

public class MainActivity extends Activity {

private GridView gridView;
private GridviewAdapter gridAdapter;


String[] items = {
        "http://static.panoramio.com/photos/large/116726502.jpg",
        "http://static.panoramio.com/photos/large/116726502.jpg",
        "http://static.panoramio.com/photos/large/116726502.jpg",
        "http://static.panoramio.com/photos/large/116726502.jpg",
        "http://static.panoramio.com/photos/large/116726502.jpg",
        "http://static.panoramio.com/photos/large/116726502.jpg",
        "http://static.panoramio.com/photos/large/116726502.jpg",
        "http://static.panoramio.com/photos/large/116726502.jpg",
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    gridView = (GridView) findViewById(R.id.gridView);


    gridAdapter = new GridviewAdapter(MainActivity.this, items);


    gridView.setAdapter(gridAdapter);

  }
}

还有一个适用于通常工作的适配器。

public class GridviewAdapter extends BaseAdapter{

private Context context;
private String[] items;


public GridviewAdapter(Context context, String[] items){
    super();
    this.context = context;
    this.items = items;
}


@Override
public int getCount() {
    return items.length;
}


@Override
public Object getItem(int position) {
    return items[position];
}

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


@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ImageView img = null;
    if (convertView == null) {

        img = new ImageView(context);

        convertView = img;
        img.setPadding(5, 5, 5, 5);
    } else {
        img = (ImageView) convertView;
    }



    Picasso.with(context)

        .load(items[position])

        .placeholder(R.drawable.picture)
        .resize(200, 200)

        .into(img);

    return convertView;
    }

}

希望这对某人有用......

使用Picasso Lib不显示GridView图像

4 个答案: