使用来自网址的图片折叠工具栏？

我为我的Android应用程序做了一个带有图像的折叠工具栏.它与drawable图像完美配合.我的问题是当我从URL检索图像并将其分配给同一图像视图时.折叠工具栏无法使用.标题不见了,无法滚动,也没有图像.

这是我的截图.

图1是来自drawable的图像,图2是从URL中检索的图像

活动:

    import android.app.ProgressDialog;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.drawable.BitmapDrawable;
    import android.os.AsyncTask;
    import android.os.Build;
    import android.os.Bundle;
    import android.support.design.widget.CollapsingToolbarLayout;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.graphics.Palette;
    import android.support.v7.widget.Toolbar;
    import android.widget.ImageView;

    import android.widget.Toast;

    import java.io.InputStream;
    import java.net.URL;


    public class RecipeDisplay extends AppCompatActivity {
        CollapsingToolbarLayout collapsingToolbarLayout;
        ImageView image;
        ImageView img;
        Bitmap bitmap;
        ProgressDialog pDialog;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_recipe_display);
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);

            //default header image for toolbar
            image = (ImageView) findViewById(R.id.image);
            image.setImageResource(R.drawable.header);

            //Loading image using async task
            new LoadImage().execute("http://www.twinaccommodation.com/media/313799/pub_food_281x281.jpg");

            collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
    collapsingToolbarLayout.setTitle("Collapsing");
    collapsingToolbarLayout.setExpandedTitleColor(getResources().getColor(android.R.color.transparent));

       }

       //async task
       private class LoadImage extends AsyncTask {
            @Override
            protected void onPreExecute() {
               super.onPreExecute();
               pDialog = new ProgressDialog(RecipeDisplay.this);
               pDialog.setMessage("Loading....");
               pDialog.show();

            }

            protected Bitmap doInBackground(String... args) {
                try {
                    bitmap = BitmapFactory.decodeStream((InputStream) new URL(args[0]).getContent());

                } catch (Exception e) {
                    e.printStackTrace();
                }
                return bitmap;
            }

            protected void onPostExecute(Bitmap img) {

                if (img != null) {
                    image.setImageBitmap(img);
                    pDialog.dismiss();

                } else {

                    pDialog.dismiss();
                    Toast.makeText(RecipeDisplay.this, "Error retrieving image", Toast.LENGTH_SHORT).show();

                }
            }
        }

    }

LOGCAT也没有错误...请帮我解决这个问题.

编辑:XML布局

使用android studio 1.5及更高版本,您可以创建滚动模板.然后将imageview添加到布局中

然后使用毕加索将其加载到图像中

public class MyActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        ImageView toolbarImage = (ImageView) findViewById(R.id.image_id);

        String url = "" //place your url here
        picassoLoader(this, toolbarImage, url);
     }

        public void picassoLoader(Context context, ImageView imageView, String url){
        Log.d("PICASSO", "loading image");
        Picasso.with(context)
                .load(url)
                        //.resize(30,30)
                .placeholder(R.drawable.placeholder_image)
                .error(R.drawable.placeholder_image)
                .into(imageView);
    }
}

将picasso库添加到gradle依赖项中

compile 'com.squareup.picasso:picasso:2.5.2'