Android Image Dialog/Popup same size as image and no border

Question

At the moment I am working on a file browser. Everything works fine with one exception: If the user clicks on an image (jpg, png, bmp, ..), I want the image to be displayed in a dialog or in a popup which has the same size as the image - so that there are no borders at all. The image files are located on the sdcard.

Here is what I have so far:

BitmapDrawable bitmap = new BitmapDrawable(context.getResources(), TARGET_PATH);  AlertDialog.Builder imageDialog = new AlertDialog.Builder(context); LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);  View layout = inflater.inflate(R.layout.thumbnail, null); ImageView image = (ImageView) layout.findViewById(R.id.thumbnail_IMAGEVIEW); image.setImageDrawable(bitmap); imageDialog.setView(layout); imageDialog.create(); imageDialog.show(); 

The XML file:

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent" >      <ImageView         android:id="@+id/thumbnail_IMAGEVIEW"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignParentLeft="true"         android:layout_alignParentTop="true"         android:contentDescription="@string/icon_DESCRIPTION" />  </RelativeLayout> 

Here is the output:

There are ugly borders at the edges of the images - I don't want them to be shown. I tried lots of stuff and examples listed in google, etc.. - nothing worked yet.

The best option will be to make the dialog/the view behind the image, the same size as the image. Another way could be to set the background behind the image transparent.

How do I achieve any solution? I'd love to make the background the same size as the image is, so there is no "invisible" stuff left, but I will also be okay with the transparent option.

---

Solution:

// Get screen size Display display = context.getWindowManager().getDefaultDisplay(); Point size = new Point(); display.getSize(size); int screenWidth = size.x; int screenHeight = size.y;  // Get target image size Bitmap bitmap = BitmapFactory.decodeFile(TARGET); int bitmapHeight = bitmap.getHeight(); int bitmapWidth = bitmap.getWidth();  // Scale the image down to fit perfectly into the screen // The value (250 in this case) must be adjusted for phone/tables displays while(bitmapHeight > (screenHeight - 250) || bitmapWidth > (screenWidth - 250)) {     bitmapHeight = bitmapHeight / 2;     bitmapWidth = bitmapWidth / 2; }  // Create resized bitmap image BitmapDrawable resizedBitmap = new BitmapDrawable(context.getResources(), Bitmap.createScaledBitmap(bitmap, bitmapWidth, bitmapHeight, false));  // Create dialog Dialog dialog = new Dialog(context); dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); dialog.setContentView(R.layout.thumbnail);  ImageView image = (ImageView) dialog.findViewById(R.id.imageview);  // !!! Do here setBackground() instead of setImageDrawable() !!! // image.setBackground(resizedBitmap);  // Without this line there is a very small border around the image (1px) // In my opinion it looks much better without it, so the choice is up to you. dialog.getWindow().setBackgroundDrawable(null);  // Show the dialog dialog.show(); 

XML file:

<?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/imageview"     android:layout_width="match_parent"     android:layout_height="match_parent" >  </ImageView> 

Final Output:

Answer 1

Change your ImageView from this:

<ImageView         android:id="@+id/thumbnail_IMAGEVIEW"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignParentLeft="true"         android:layout_alignParentTop="true"         android:contentDescription="@string/icon_DESCRIPTION" /> 

To this:

<ImageView         android:id="@+id/thumbnail_IMAGEVIEW"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignParentLeft="true"         android:layout_alignParentTop="true"         android:adjustViewBounds="true" <!-- Here is the thing -->         android:contentDescription="@string/icon_DESCRIPTION" /> 

Hope this helps.