android - 在 Android 中从 Picasso 下载多张图片

Question

我正在使用 Picasso 库从 URL 下载图像。这是我对 picasso 的第一次尝试

场景:我想从服务器下载一些图像并将它们存储到一个文件中。我知道如何存储到文件和检索。当我运行下面的代码时，我碰巧看到我只得到了最后一张图片。 picasso 似乎并行运行。我通过显示 toast 消息来检查它。有没有办法解决这个问题？

问题:我只得到最后一个 url 图片。

这是我的代码

static int  count = 0;

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

    for (int i = 0; i < url.length; i++)
    {

        // url is String array which has 2 urls. 
        ++count;   // Incrementing the count by 1
        Picasso.with(this).load(url[i])
        .into(new Target() {

            @Override
            public void onPrepareLoad(Drawable arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onBitmapLoaded(Bitmap arg0, LoadedFrom arg1) {
                // TODO Auto-generated method stub
                arg0 = Bitmap.createScaledBitmap(arg0, 150, 150, true);
                filePath = saveFile(arg0);   // I'm just calling this function to check how many times `onBitmapLoaded` is called. And it is called only once...!!
            }

            @Override
            public void onBitmapFailed(Drawable arg0) {
                // TODO Auto-generated method stub

            }
        });
    }
}

public String saveFile (Bitmap bm)
{

   Toast.makeText(getApplicationContext(), ""+count, 100).show(); // Displaying the value of count, which always display as **2**. 
   return "";
}

Answer 1

尝试这种方式，希望这能帮助您解决问题。

static int  count = 0;

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

    for (int i = 0; i < url.length; i++)
    {

        // url is String array which has 2 urls. 
        Picasso.with(this).load(url[i])
        .into(new Target() {

            @Override
            public void onPrepareLoad(Drawable arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onBitmapLoaded(Bitmap arg0, LoadedFrom arg1) {
                // TODO Auto-generated method stub
                arg0 = Bitmap.createScaledBitmap(arg0, 150, 150, true);
                ++count; // Incrementing the count by 1
                filePath = saveFile(arg0);   // I'm just calling this function to check how many times `onBitmapLoaded` is called. And it is called only once...!!
            }

            @Override
            public void onBitmapFailed(Drawable arg0) {
                // TODO Auto-generated method stub

            }
        });
    }
}

public String saveFile (Bitmap bm)
{

   Toast.makeText(getApplicationContext(), ""+count, 100).show(); // Displaying the value of count, which always display as **2**. 
   return "";
}