android - picasso - 将图像加载到适配器中的图像按钮

Question

我想将图像加载到适配器中的 ImageButton 中，这有时不起作用...我有一个具有 4 个条目的适配器，有时按钮图像只加载了 2 次而不是 4 次。始终仅在第一次创建适配器时...屏幕旋转左右后，一切正常...但在第一个显示器上，它无法正常工作...

4 行的适配器仅在第一次创建时调用 2 次准备和两次加载...

以下是我的适配器的getView:

@Override
public View getView(final int position, View convertView, ViewGroup parent)
{
    if (convertView == null)
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.row_link, parent, false);

    convertView.setTag(R.id.tag_pos, position);

    ImageView iconRow = ViewHolder.get(convertView, R.id.icon);
    final ImageButton btOpen = ViewHolder.get(convertView, R.id.btOpen);

    // this NEVER fails
    PicassoTools.getPicasso().load(item.getIconResId()).into(iconRow);
    // this sometimes (at the first start) does not work reliable
    PicassoTools.getPicasso().load(isAutoLinked ? R.drawable.linked : R.drawable.unlinked).into(new Target()
    {
        @Override
        public void onPrepareLoad(Drawable d)
        {
            L.d(this, "BUTTON PREPARE");
        }

        @Override
        public void onBitmapLoaded(Bitmap b, LoadedFrom loadedFrom)
        {
            L.d(this, "BUTTON LOADED");
            btLink.setImageBitmap(b);
        }

        @Override
        public void onBitmapFailed(Drawable d)
        {
            L.d(this, "BUTTON FAILED");
            btLink.setImageBitmap(null);
        }
    });

    return convertView;
}

我的 PicassoTools 函数(我在这个类中有一些额外的函数):

public static Picasso getPicasso()
{
    if (picasso == null)
        picasso = new Picasso.Builder(MainApp.getAppContext()).memoryCache(getCache()).build();
    return picasso;
}

Answer 1

使用目标

private Target loadtarget;

在getView()中写这段代码

if (loadtarget == null)
    loadtarget = new Target() {
        @Override
        public void onBitmapFailed(Drawable arg0) {
        }

        @Override
        public void onBitmapLoaded(Bitmap bitmap, LoadedFrom from) {
            handleLoadedBitmap(bitmap);
        }

        @Override
        public void onPrepareLoad(Drawable arg0) {

        }
    };

try {
    Picasso.with(this).load(url).into(loadtarget);
} catch (IllegalArgumentException iae) {
    iae.printStackTrace();
}

public void handleLoadedBitmap(Bitmap b) {
    BitmapDrawable bdrawable = new BitmapDrawable(b);
    imageButton.setBackgroundDrawable(bdrawable);
}

希望这对你有帮助:)