如何使用progressbar加载Picasso中的图像？

Question

我希望onstart()方法使用picasso从服务器加载图像，并且我希望显示一个进度条，直到照片完全下载完毕。下面是我的代码：

@Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();

        Picasso.with(context).load(imageLoad)
                .placeholder(R.id.progressBarDetails)
                .error(R.drawable.friend_request).noFade().resize(200, 200)
                .into(avatarImage, new Callback() {
                    @Override
                    public void onError() {
                        // TODO Auto-generated method stub

                    }

                    @Override
                    public void onSuccess() {
                        // TODO Auto-generated method stub
                        progressbar.setVisibility(View.GONE);
                    }

                });

        Picasso.with(this).load(imageLoad).into(target);

    }

    OnFinished a = new OnFinished() {

        @Override
        public void onSendFinished(IntentSender IntentSender, Intent intent,
                int resultCode, String resultData, Bundle resultExtras) {
            // TODO Auto-generated method stub
            intent = new Intent(getApplicationContext(), Map.class);
        }
    };

    private Target target = new Target() {
        @Override
        public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    File file = new File(Environment
                            .getExternalStorageDirectory().getPath()
                            + "/actress_wallpaper.jpg");
                    try {
                        file.createNewFile();
                        FileOutputStream ostream = new FileOutputStream(file);
                        bitmap.compress(CompressFormat.JPEG, 75, ostream);
                        ostream.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                }
            }).start();
        }

Answer 1

我还没有测试过您的代码，但是即使这样，文件actress_wallpaper.jpg也不会加载到ImageView中。在文件里，上面写着

实现此类的对象必须具有Object.equals(Object)和Object.hashcode()的工作实现，以便在内部进行适当的存储。

试试这个：

File file = new File(pathToFile);

Picasso.with(context)
       .load(file)
       .into(imageView, new Callback() {
           @Override
           public void onSuccess() {
               progressbar.setVisibility(View.GONE);
           }
       });

我试过2.3.2和2.3.3版本，似乎有一个问题https://github.com/square/picasso/issues/539