使用毕加索下载图像会在缓存中创建不正确的图像，可能会解决吗? [英] Downloading images using Picasso creates incorrect images in cache, possible fix?

问题描述

我有一个包含图像URL的Realm数据库，我需要将这些图像下载到ExternalCacheDir中.现在，这里是问题:假设我有三个图像:ar11.jpg，ar12.jpg，ar13.jpg.一旦执行了我的代码，我就在缓存目录中获得了3张jpg图像，具有上述名称，但是所有3张图像都是最后一张图像的副本，即ar13.jpg，其名称为ar11，ar12，ar13.

I have a Realm database with image URLs, and I need to download these images in the ExternalCacheDir . Now here lies the problem : assume I have three images : ar11.jpg,ar12.jpg,ar13.jpg . Once my code is executed, I obtain 3 jpg images in the cache dir, with the above mentioned names, however all three images are the replicas of the last image, ie ar13.jpg with the names ar11,ar12,ar13.

这是我的代码:

 private void downloadImage()
{
    RealmResults<ARDatabase> results = mRealm.where(ARDatabase.class).findAll();

    for(ARDatabase x:results)
    {
        if(!x.getIsDownloaded())
        {
            mdataCollection.add(new DownLoadList(x.getUrlImg(),x.getUid()));
        }
    }

    for(DownLoadList i:mdataCollection)
    {
        Log.e("Link",""+i.getImageUrl());
        Picasso.with(getApplicationContext()).load(i.getImageUrl()).into(target);
    }
}

 private Target target = new Target() {
    @Override
    public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from)
    {
        Log.e("PICASSO","SUCCESSFUL");


        new Thread(new Runnable() {
            @Override
            public void run() {

                File sd = getExternalCacheDir();
                File folder = new File(sd, "/arproject/");
                if (!folder.exists()) {
                    if (!folder.mkdir()) {
                        Log.e("ERROR", "Cannot create a directory!");
                    } else {
                        folder.mkdirs();
                    }
                }

                //File[] fileName = {new File(folder, "one.jpg"), new File(folder, "two.jpg")};


                for (DownLoadList i:mdataCollection)
                {
                    File fileName = new File(folder,i.getUid().toLowerCase()+".jpg");


                    if (!fileName.exists()) {
                        try {
                            fileName.createNewFile();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                    else
                    {

                        try {
                            FileOutputStream outputStream = new FileOutputStream(String.valueOf(fileName));
                            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
                            outputStream.close();

                        } catch (FileNotFoundException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }


                }


            }
        }).start();

    }

    @Override
    public void onBitmapFailed(Drawable errorDrawable)
    {
        Log.e("PICASSO","FAILED"+errorDrawable.toString());

    }

    @Override
    public void onPrepareLoad(Drawable placeHolderDrawable) {

    }
};

什么可能导致这种冗余，以及如何解决?

What is probably causing this redundancy, and how to fix it?

推荐答案

为每个图像调用目标.

每个图像都以每个名称写入缓存中.

Each image is getting written in cache under every name.

第一个ar11.jpg保存为ar11.jpg, ar12.jpg, ar13.jpg. 然后ar12.jpg和ar13.jpg

First ar11.jpg is saved as ar11.jpg, ar12.jpg, ar13.jpg. Then same happens with ar12.jpg and ar13.jpg

尝试以下代码:

private void downloadImage()
{
    RealmResults<ARDatabase> results = mRealm.where(ARDatabase.class).findAll();

    for(ARDatabase x:results)
    {
        if(!x.getIsDownloaded())
        {
            mdataCollection.add(new DownLoadList(x.getUrlImg(),x.getUid()));
        }
    }

    for(DownLoadList i:mdataCollection)
    {
        Log.e("Link",""+i.getImageUrl());
        Picasso.with(getApplicationContext()).load(i.getImageUrl()).into(getTarget(i));
    }
}

private Target getTarget(DownLoadList downLoadList) {
    Target target = new Target() {
        @Override
        public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from)
        {
            Log.e("PICASSO","SUCCESSFUL");

            new Thread(new Runnable() {
                @Override
                public void run() {

                    File sd = getExternalCacheDir();
                    File folder = new File(sd, "/arproject/");
                    if (!folder.exists()) {
                        if (!folder.mkdir()) {
                            Log.e("ERROR", "Cannot create a directory!");
                        } else {
                            folder.mkdirs();
                        }
                    }

                    //File[] fileName = {new File(folder, "one.jpg"), new File(folder, "two.jpg")};


                    File fileName = new File(folder, downLoadList.getUid().toLowerCase()+".jpg");


                    if (!fileName.exists()) {
                        try {
                            fileName.createNewFile();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                    else
                    {

                        try {
                            FileOutputStream outputStream = new FileOutputStream(String.valueOf(fileName));
                            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
                            outputStream.close();

                        } catch (FileNotFoundException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }

                }
            }).start();

        }

        @Override
        public void onBitmapFailed(Drawable errorDrawable)
        {
            Log.e("PICASSO","FAILED"+errorDrawable.toString());

        }

        @Override
        public void onPrepareLoad(Drawable placeHolderDrawable) {

        }

    }
    return target;
}

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