我制作了这个Custom Drawable，它应该将任何Drawable剪辑成圆形。但是通过我的实现，drawable传递的是原始形式的输出而不是循环形式。
public class CircularDrawable extends Drawable {
Paint mPaint,xfermodePaint;
Drawable mDrawable;
int[] vinylCenter = new int[2];
int radius;
Bitmap src;
PorterDuffXfermode xfermode;
Rect rect;
Canvas testCanvas;
public CircularDrawable(Drawable drawable) {
mDrawable = drawable;
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setColor(0xffffffff);
mPaint.setStyle(Paint.Style.FILL);
xfermodePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
xfermode=new PorterDuffXfermode(PorterDuff.Mode.SRC_IN);
xfermodePaint.setXfermode(xfermode);
testCanvas=new Canvas();
}
@Override
public void setBounds(Rect bounds) {
super.setBounds(bounds);
mDrawable.setBounds(bounds);
}
@Override
public void setBounds(int left, int top, int right, int bottom) {
super.setBounds(left, top, right, bottom);
mDrawable.setBounds(left, top, right, bottom);
}
@Override
protected void onBoundsChange(Rect bounds) {
super.onBoundsChange(bounds);
vinylCenter[0] = bounds.width() / 2;
vinylCenter[1] = bounds.height() / 2;
radius = (bounds.right - bounds.left) / 2;
src = Bitmap.createBitmap(bounds.width(), bounds.height(), Bitmap.Config.ARGB_8888);
testCanvas.setBitmap(src);
}
@Override
public void draw(Canvas canvas) {
canvas.save();
canvas.drawARGB(0, 0, 0, 0);
canvas.drawCircle(vinylCenter[0],vinylCenter[1],radius,mPaint);
mDrawable.draw(testCanvas);
canvas.drawBitmap(src,0f,0f,xfermodePaint);
}
@Override
public void setAlpha(int alpha) {/*ignored*/}
@Override
public void setColorFilter(ColorFilter colorFilter) {/*ignored*/}
@Override
public int getOpacity() {
/*ignored*/
return 0;
}
}
我的错误是什么？
此外，我正在使用SquareImageview来显示这个drawable，它只是使onMeasure中的视图正方形。 此问题不适用于圆形图像视图。
答案 0 :(得分：4)
您已在支持库v4中优化了圆形绘图的实现：
/**
* A Drawable that wraps a bitmap and can be drawn with rounded corners. You can create a
* RoundedBitmapDrawable from a file path, an input stream, or from a
* {@link android.graphics.Bitmap} object.
* <p>
* Also see the {@link android.graphics.Bitmap} class, which handles the management and
* transformation of raw bitmap graphics, and should be used when drawing to a
* {@link android.graphics.Canvas}.
* </p>
*/
public abstract class RoundedBitmapDrawable extends Drawable ....
答案 1 :(得分：3)
在使用Porter / Duff xfermode模式时，默认情况下画布没有启用Alpha通道（根据我在android中的经验）。这就是整个图像（src）作为输出的原因。 Porter / Duff xfermode基于Alpha通道。
在Round Drawable 2 Canvas的许多实现中，其中一个被赋予RGB图像位图，而另一个被给予具有圆形掩模的alpha通道位图。应用Porter / Duff xfermodeis，结果将在主画布上绘制。
我的错误是我没有指定绘图功能的画布，在使用画布上的xfermode图层时要考虑使用alpha通道。
绘制功能将变为
if(isset($_SESSION['user']) { header("location: memberlist.php"); }
else { // You missed another one here I think?
if($_SESSION['user']['blacklisted_users'] == 'blocked') {
header("location: blocked.php");
exit();
} else { // You missed one here
header("Location: private.php");
exit(); // Change die to exit
}
else
{
$msg = " Username or Password INCORRECT";
}
保存图层以指示带有标志的alpha通道，然后使用xfermode。最后将其恢复到保存计数。
答案 2 :(得分：3)
所以基本上我使用这种方法来获得圆角图像
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
但是就像你指出的那样有时它不起作用，它确实有效，但大多数时候发生的事情是你的imageview可能将其scaletype设置为centerCrop和其他类型，我所做的就是我第一次将我的图像高度压缩到与我的图像视图相同的高度和宽度，以便整个图像适合图像视图并且不会进行缩放或者我只是计算根据高度使用此函数进行四舍五入的角高度< / p>
private int calculatePercentage(int percentage, int target)
{
int k = (int)(target*(percentage/100.0f));
return k;
}
所以我使用我的代码如：new Bitmap(getRoundedCornerBitmap(bmp, calculatePercentage(5, bmp.getHeight()))); where 5 is 5的图像高度这给了我所有图像的相同曲线，因为有些图像比其他图像大
`
答案 3 :(得分：3)
For rounded imageview you can use this code
public class RoundedImageView extends ImageView {
public RoundedImageView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
public RoundedImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RoundedImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (drawable == null) {
return;
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
int w = getWidth();//, h = getHeight();
Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
canvas.drawBitmap(roundBitmap, 0, 0, null);
}
public static Bitmap getCroppedBitmap(Bitmap bmp, int radius)
{
Bitmap sbmp;
if (bmp.getWidth() != radius || bmp.getHeight() != radius)
sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);
else
sbmp = bmp;
Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), sbmp.getHeight(),Config.ARGB_8888);
Canvas canvas = new Canvas(output);
// final int color = 0xffa19774;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
// paint.setColor(Color.parseColor("#BAB399"));
paint.setColor(Color.parseColor("#FF0000"));
canvas.drawCircle(sbmp.getWidth() / 2 + 0.7f, sbmp.getHeight() / 2 + 0.7f, sbmp.getWidth() / 2 + 0.1f, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(sbmp, rect, rect, paint);
return output;
}
}
答案 4 :(得分：3)
For circular imageview use the below code
public class RoundedImageView extends ImageView {
public RoundedImageView(Context context) {
super(context);
}
public RoundedImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RoundedImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onDraw(Canvas canvas) {
BitmapDrawable drawable = (BitmapDrawable) getDrawable();
if (drawable == null) {
return;
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
Bitmap fullSizeBitmap = drawable.getBitmap();
int scaledWidth = getMeasuredWidth();
int scaledHeight = getMeasuredHeight();
/*
* scaledWidth = scaledWidth/2; scaledHeight = scaledHeight/2;
*/
Bitmap mScaledBitmap;
if (scaledWidth == fullSizeBitmap.getWidth()
&& scaledHeight == fullSizeBitmap.getHeight()) {
mScaledBitmap = fullSizeBitmap;
} else {
mScaledBitmap = Bitmap.createScaledBitmap(fullSizeBitmap,
scaledWidth, scaledHeight, true /* filter */);
}
// Bitmap roundBitmap = getRoundedCornerBitmap(mScaledBitmap);
// Bitmap roundBitmap = getRoundedCornerBitmap(getContext(),
// mScaledBitmap, 10, scaledWidth, scaledHeight, false, false,
// false, false);
// canvas.drawBitmap(roundBitmap, 0, 0, null);
Bitmap circleBitmap = getCircledBitmap(mScaledBitmap);
canvas.drawBitmap(circleBitmap, 0, 0, null);
}
public Bitmap getRoundedCornerBitmap(Context context, Bitmap input,
int pixels, int w, int h, boolean squareTL, boolean squareTR,
boolean squareBL, boolean squareBR) {
Bitmap output = Bitmap.createBitmap(w, h, Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final float densityMultiplier = context.getResources()
.getDisplayMetrics().density;
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, w, h);
final RectF rectF = new RectF(rect);
// make sure that our rounded corner is scaled appropriately
final float roundPx = pixels * densityMultiplier;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
// draw rectangles over the corners we want to be square
if (squareTL) {
canvas.drawRect(0, 0, w / 2, h / 2, paint);
}
if (squareTR) {
canvas.drawRect(w / 2, 0, w, h / 2, paint);
}
if (squareBL) {
canvas.drawRect(0, h / 2, w / 2, h, paint);
}
if (squareBR) {
canvas.drawRect(w / 2, h / 2, w, h, paint);
}
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(input, 0, 0, paint);
return output;
}
Bitmap getCircledBitmap(Bitmap bitmap) {
Bitmap result = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(result);
int color = Color.BLUE;
Paint paint = new Paint();
Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
// canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
canvas.drawCircle(bitmap.getWidth() / 2, bitmap.getHeight() / 2,
bitmap.getHeight() / 2, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return result;
}
}
答案 5 :(得分：0)
如果您使用的是PorterDuffXfermode：
在整个活动的清单中：
<activity android:hardwareAccelerated="false" />
或者您正在使用xfermode的特定视图：
myView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);