在AsyncTask中使用picasso加载图像

Question

我正在使用毕加索来加载图像作为我的活动的背景,我想使用AsyncTask,而图像正在加载,完成后进度条会解散,以便为我的应用程序提供更好的外观,

这是我的代码:

  private class RemoteDataTask extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        mProgressDialog = new ProgressDialog(MainActivity.this);
        mProgressDialog.setMessage("Chargement...");
        mProgressDialog.setIndeterminate(false);
        mProgressDialog.show();

    }

    @Override
    protected Void doInBackground(Void... params) {
           Picasso.with(MainActivity.this).load("http://tv2.orangeadd.com/mediacenter-data/ofc__bg_home.jpg").into(background,new com.squareup.picasso.Callback() {
                 @Override
                 public void onSuccess() {
               mProgressDialog.dismiss();
                 }

                 @Override
                 public void onError() {

                 }
             }); 
        return null;
    }
    @Override
    protected void onPostExecute(Void result) {





    }
    }

这总是显示错误并强制我的应用程序退出!

多谢你们 :)

Answer 1

public void loadImageInBackground() {

        mProgressDialog = new ProgressDialog(MainActivity.this);
        mProgressDialog.setMessage("Chargement...");
        mProgressDialog.setIndeterminate(false);

        Target target = new Target() {

            @Override
            public void onPrepareLoad(Drawable arg0) {

                mProgressDialog.show();
            }

            @Override
            public void onBitmapLoaded(Bitmap arg0, LoadedFrom arg1) {

                background.setImageBitmap(arg0);
                mProgressDialog.dismiss();
            }

            @Override
            public void onBitmapFailed(Drawable arg0) {
                // TODO Auto-generated method stub
                mProgressDialog.dismiss();
            }
        };

        Picasso.with(MainActivity.this)
                .load("http://tv2.orangeadd.com/mediacenter-data/ofc__bg_home.jpg")
                .into(target);
    }