如何根据大小正确地将下载的图像显示在警报对话框中？

问题描述

我要尝试的是显示一些我从URL下载的图像。我设法下载并显示了图像，但是我无法确定如何根据大小正确显示图像，所谓大小，是指高度，宽度不是kb。

我正在使用凌空下载图像。在片段视图中单击后，将显示警报对话框。

这是布局

    <android.support.constraint.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">
        <ImageView
            android:id="@+id/imgProduct"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="centerCrop"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </LinearLayout>
</android.support.constraint.ConstraintLayout>

这就是我显示警报对话框的方式

    LayoutInflater layoutInflater = (LayoutInflater)getActivity().getBaseContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View imageDialog = layoutInflater.inflate(R.layout.popup_product_image,null);
    Dialog dialog = new Dialog(context);
    dialog.requestwindowFeature(Window.FEATURE_NO_TITLE);
    dialog.setContentView(imageDialog);
    dialog.setCanceledOnTouchOutside(true);
    //dialog.getwindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));

    ImageView imgImage = imageDialog.findViewById(R.id.imgProduct);

    String url = product.urlImage.replaceAll("\\s+","");

    ImageRequest imgRequest = new ImageRequest(url,new Response.Listener<Bitmap>() {
        @Override
        public void onResponse(Bitmap response) {
            imgImage.setimageBitmap(response);
            imgImage.startAnimation(AnimationUtils.loadAnimation(context,android.R.anim.fade_in));
        }
    },ImageView.ScaleType.CENTER_CROP,Bitmap.Config.ARGB_8888,new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            imgImage.setimageResource(RES_ERROR);
            Toast.makeText(context,VolleyManager.getInstance(context)
                    .checkerror(error),Toast.LENGTH_LONG).show();
        }
    });
    imgRequest.setTag(CANCELABLE_REQUEST_TAG);
    VolleyManager.getInstance(context).getRequestQ().add(imgRequest);

    // Set your image

    dialog.show();
    dialog.getwindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);

任何帮助或建议都很好，谢谢

解决方法

使用上面的注释，请使用Piccaso。尝试此操作，然后从“ ImageView imgImage = imageDialog.findViewById（R.id.imgProduct）;”中修改

Target target = new Target() {
            @Override
            public void onBitmapLoaded(Bitmap bitmap,Picasso.LoadedFrom from) {
                imgImage.setImageBitmap(bitmap);
                doFoo();
            }

        @Override
        public void onBitmapFailed(Drawable errorDrawable) {
            imgImage.setImageDrawable(errorDrawable);
            Toast.makeText(context,"download failed",Toast.LENGTH_SHORT).show();
            doBar();
        }

        @Override
        public void onPrepareLoad(Drawable placeHolderDrawable) {
            imgImage.setImageDrawable(placeHolderDrawable);
        }
    };

    //this will help us to avoid the Target being gc'd
    imgImage.setTag(target);

    Picasso.with(context)
            .load(url)
            .placeholder(RES_PLACEHOLDER)
            .error(RES_ERROR)
            .resize(400,400)
            .into(target);

    // Set your image

    dialog.show();
    dialog.getWindow().setLayout(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);

然后使用伪函数

private void doFoo() {
    //dummy
}
private void doBar() {
    //dummy
}