Question

我有一个包含图像和文本的自定义列表视图，并使用Glide图像库在listview中正确加载。现在我想在imageview上实现一个OnItemClickListener，以在另一个活动中显示图像。

适配器代码：

public class DescAdapter extends BaseAdapter {

private final listdisplay ds;
private ArrayList<descusers> dusers;
private ArrayList<descusers> orig;

public DescAdapter(listdisplay ds, ArrayList<descusers> dusers) {
    this.ds = ds;
    this.dusers = dusers;
}

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

@Override
public Object getItem(int position) {
    return dusers.get(position);
}

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

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

    descusers du = dusers.get(position);
    String username = du.loginname;
    String descCrip=du.descCrip;
    String Limage = du.image;
    long Ptime = du.Ptime;

    Viewholder viewholder = null;



    if(convertView==null) {
        viewholder = new Viewholder();
        convertView = LayoutInflater.from(ds).inflate(R.layout.customlist, null);
        viewholder.uname = (TextView) convertView.findViewById(R.id.username);
        viewholder.desc = (TextView) convertView.findViewById(R.id.description);
        viewholder.time = (TextView)convertView.findViewById(R.id.time);

        viewholder.iview = (ImageView) convertView.findViewById(R.id.imageList);


        convertView.setTag(viewholder);
    }else {

        viewholder = (Viewholder) convertView.getTag();
    }

    viewholder.uname.setText(username);
    viewholder.desc.setText(descCrip);

        if (Limage.trim().isEmpty()) {
            viewholder.iview.setVisibility(View.GONE);
        } else {
            Glide.with(convertView.getContext()).load(Limage)
                    .diskCacheStrategy(DiskCacheStrategy.ALL).fitCenter().centerCrop().into(viewholder.iview);
            viewholder.iview.setVisibility(View.VISIBLE);

        }


    return convertView;
}

OnItemClick代码：

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    final ImageView imageView = (ImageView) view.findViewById(R.id.imageList);
    final BitmapDrawable bitmapDrawable = (BitmapDrawable) imageView.getDrawable();
    final Bitmap yourBitmap = bitmapDrawable.getBitmap();
    Intent intent = new Intent(this, cust.class);
    intent.putExtra("BitmapImage", yourBitmap);

}

收到意图：

Intent intent = getIntent();
    Bitmap bitmap = (Bitmap) intent.getParcelableExtra("BitmapImage");
    imagedisplay = (ImageView)findViewById(R.id.imagedisplay);
    imagedisplay.setImageBitmap(bitmap);

但是当我点击下面的图片时，会看到异常。

java.lang.ClassCastException：com.bumptech.glide.load.resource.bitmap.GlideBitmapDrawable无法强制转换为android.graphics.drawable.BitmapDrawable

Answer 1

 final BitmapDrawable bitmapDrawable = (BitmapDrawable) imageView.getDrawable();

将此BitmapDrawable转换更改为GlideBitmapDrawable。

final GlideBitmapDrawable bitmapDrawable = (GlideBitmapDrawable ) imageView.getDrawable();

我希望Picaso将drawable作为GlideBitmapDrawable格式。

Answer 2

您应该传递图片网址，然后在详细活动中加载该图片网址，而不是传递 Bitmap 。 Glide处理 caching 图片，以便快速加载并避免不必要的位图对象混乱。

Answer 3

试试这段代码在适配器类中传递intent：

Intent i = new Intent(context, S.class);
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            i.putExtra("image",Limage);

            context.startActivity(i);

在你的S.class中获得意图

Intent i = getIntent();
String image = i.getStringExtra("image");
Picasso.with(this).load(image).into(img_meme);//imageview name

希望它适用于你

使用Glide / Picasso图像库时如何使用OnItemClick侦听器

3 个答案: