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POCustom ImageView with drop shadow
 

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    <p>Okay, I've been reading and searching around, and am now banging my head against the wall trying to figure this out. Here's what I have so far:</p> <pre><code>package com.pockdroid.sandbox; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.widget.ImageView; public class ShadowImageView extends ImageView { private Rect mRect; private Paint mPaint; public ShadowImageView(Context context) { super(context); mRect = new Rect(); mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setShadowLayer(2f, 1f, 1f, Color.BLACK); } @Override protected void onDraw(Canvas canvas) { Rect r = mRect; Paint paint = mPaint; canvas.drawRect(r, paint); super.onDraw(canvas); } @Override protected void onMeasure(int w, int h) { super.onMeasure(w,h); int mH, mW; mW = getSuggestedMinimumWidth() &lt; getMeasuredWidth()? getMeasuredWidth() : getSuggestedMinimumWidth(); mH = getSuggestedMinimumHeight() &lt; getMeasuredHeight()? getMeasuredHeight() : getSuggestedMinimumHeight(); setMeasuredDimension(mW + 5, mH + 5); } </code></pre> <p>}</p> <p>The "+5" in the measurements are there as temporary; From what I understand I'll need to do some math to determine the size that the drop shadow adds to the canvas, right? </p> <p>But when I use this:</p> <pre><code>public View getView(int position, View convertView, ViewGroup parent) { ShadowImageView sImageView; if (convertView == null) { sImageView = new ShadowImageView(mContext); GridView.LayoutParams lp = new GridView.LayoutParams(85, 85); sImageView.setLayoutParams(lp); sImageView.setScaleType(ImageView.ScaleType.CENTER); sImageView.setPadding(5,5,5,5); } else { sImageView = (ShadowImageView) convertView; } sImageView.setImageBitmap(bitmapList.get(position)); return sImageView; } </code></pre> <p>in my ImageView, I still get just a normal ImageView when I run the program. </p> <p>Any thoughts? Thanks.</p> <p>EDIT: So I spoke with RomainGuy some in the IRC channel, and I have it working now for plain rectangular images with the below code. It still won't draw the shadow directly to my bitmap's transparency though, so I'm still working on that.</p> <pre><code>@Override protected void onDraw(Canvas canvas) { Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.omen); Paint paint = new Paint(); paint.setAntiAlias(true); paint.setShadowLayer(5.5f, 6.0f, 6.0f, Color.BLACK); canvas.drawColor(Color.GRAY); canvas.drawRect(50, 50, 50 + bmp.getWidth(), 50 + bmp.getHeight(), paint); canvas.drawBitmap(bmp, 50, 50, null); } </code></pre>
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    1. CO"it working now for plain rectangular images" ... so it doesn't work for non-rectangular images, and then I assume it also doesn't work for 9patch-images, correct? Did you meanwhile get it to work? Cause this approach by Romain Guy doesn't work for me in my test yet.
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    2. COHmm, interesting question. I would think you could probably take your View that's using the 9-patch, and wrap it in a FrameLayout, and give the FrameLayout the drop shadow 9-patch background. But yeah, it only works for rectangular images, because there's no way for a 9-patch to follow transparency contours. I unfortunately haven't found a better solution, however, I haven't really tried again since.
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