为了在框架中显示图像,有两种方法可以做到这一点
- 设置背景图像或颜色以显示图像在框架中
- 设置遮罩
用于设置背景:
<ImageView
android:id = "@+id/imageItem"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:adjustViewBounds = "true"
android:scaleType = "center"
android:padding = "5dp"
android:background = "#FFFFFF"
android:contentDescription = "@null" />
对于掩蔽检查以下代码:
ImageView mImageView= (ImageView)findViewById(R.id.imageview_id);
Bitmap original = BitmapFactory.decodeResource(getResources(),R.drawable.content_image);
Bitmap mask = BitmapFactory.decodeResource(getResources(),R.drawable.mask);
Bitmap result = Bitmap.createBitmap(mask.getWidth(), mask.getHeight(), Config.ARGB_8888);
Canvas mCanvas = new Canvas(result);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
mCanvas.drawBitmap(original, 0, 0, null);
mCanvas.drawBitmap(mask, 0, 0, paint);
paint.setXfermode(null);
mImageView.setImageBitmap(result);
mImageView.setScaleType(ScaleType.CENTER);
mImageView.setBackgroundResource(R.drawable.background_frame);
如果您想将颜色显示为背景,那么第一个选项也会更好、更有效。