[英]Make Image view rounded (not the image)
要求是:
要求1:从网址获取图片
R2:将它们保存在缓存中
R3:使ImageView舍入而不是图像
因此,对于R1和R2,我找到了一个库: http : //loopj.com/android-smart-image-view/
对于R3,我已经做了很多研发工作,发现的所有内容都会转换图像而不是ImageView。 这是我搜索的内容:
https://github.com/vinc3m1/RoundedImageView
https://github.com/lopspower/CircularImageView
我知道可以使用ImageView位图并将图像四舍五入,但是对于我想使用的特定库,这是不可能的(对于非常复杂的线程来说可能)。
因此,请帮助我将ImageView舍入而不是四舍五入。
所以这是简约的版本:
class RoundImageView extends ImageView {
private static final int RADIUS = 32;
private Paint mPaint;
private Paint mSrcIn;
private RectF mRect;
public RoundImageView(Context context) {
super(context);
// setBackgroundColor(0xffffffff);
mSrcIn = new Paint();
mSrcIn.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mRect = new RectF();
}
@Override
public void onDraw(Canvas canvas) {
Drawable dr = getDrawable();
if (dr != null) {
mRect.set(dr.getBounds());
getImageMatrix().mapRect(mRect);
mRect.offset(getPaddingLeft(), getPaddingTop());
int rtc = canvas.saveLayer(mRect, null, Canvas.ALL_SAVE_FLAG);
// draw DST
canvas.drawRoundRect(mRect, RADIUS, RADIUS, mPaint);
canvas.saveLayer(mRect, mSrcIn, Canvas.ALL_SAVE_FLAG);
// draw SRC
super.onDraw(canvas);
canvas.restoreToCount(rtc);
}
}
}
或在不使用硬件加速的情况下使用甚至更短的一种,则可以使用Canvas.clipPath:
class RoundImageViewClipped extends ImageView {
private static final int RADIUS = 32;
private RectF mRect;
private Path mClip;
public RoundImageViewClipped(Context context) {
super(context);
// setBackgroundColor(0xffffffff);
mRect = new RectF();
mClip = new Path();
}
@Override
public void onDraw(Canvas canvas) {
Drawable dr = getDrawable();
if (dr != null) {
mRect.set(dr.getBounds());
getImageMatrix().mapRect(mRect);
mRect.offset(getPaddingLeft(), getPaddingTop());
mClip.reset();
mClip.addRoundRect(mRect, RADIUS, RADIUS, Direction.CCW);
canvas.clipPath(mClip);
super.onDraw(canvas);
}
}
}
我很确定您不能“使ImageView变圆”,因为所有View实际上都是矩形的,因此您要做的就是伪造它。
使用如下方法从图像上切出一个圆:
public Bitmap getRoundedBitmap(Bitmap scaleBitmapImage) {
int targetRadius = scaleBitmapImage.getWidth();
if(targetRadius > scaleBitmapImage.getHeight()) targetRadius = scaleBitmapImage.getHeight();
Bitmap targetBitmap = Bitmap.createBitmap(targetRadius, targetRadius, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(targetBitmap);
Path path = new Path();
path.addCircle(((float) scaleBitmapImage.getWidth() - 1) / 2, ((float) scaleBitmapImage.getHeight() - 1) / 2, (Math.min(((float) scaleBitmapImage.getWidth()), ((float) scaleBitmapImage.getHeight())) / 2), Path.Direction.CCW);
canvas.clipPath(path);
Bitmap sourceBitmap = scaleBitmapImage;
canvas.drawBitmap(sourceBitmap, new Rect(0, 0, sourceBitmap.getWidth(), sourceBitmap.getHeight()), new Rect(0, 0, scaleBitmapImage.getWidth(), scaleBitmapImage.getHeight()), null);
return targetBitmap;
}
由于修剪的部分是透明的,因此它将看起来像实际的“视图”是一个圆。 另外,请确保View的边界是平方的(或AdjustViewBounds =“ true”),否则可能会导致宽度或高度出现视觉失真。
可以肯定的是,这实际上与“舍入视图”非常接近。
Romain Guy提供的使用自定义Drawable的解决方案怎么样? 您的ImageView不会是圆形的,并且您的源图像将保持不变。
class StreamDrawable extends Drawable {
private final float mCornerRadius;
private final RectF mRect = new RectF();
private final BitmapShader mBitmapShader;
private final Paint mPaint;
private final int mMargin;
StreamDrawable(Bitmap bitmap, float cornerRadius, int margin) {
mCornerRadius = cornerRadius;
mBitmapShader = new BitmapShader(bitmap,
Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setShader(mBitmapShader);
mMargin = margin;
}
@Override
protected void onBoundsChange(Rect bounds) {
super.onBoundsChange(bounds);
mRect.set(mMargin, mMargin, bounds.width() - mMargin, bounds.height() - mMargin);
}
@Override
public void draw(Canvas canvas) {
canvas.drawRoundRect(mRect, mCornerRadius, mCornerRadius, mPaint);
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
@Override
public void setAlpha(int alpha) {
mPaint.setAlpha(alpha);
}
@Override
public void setColorFilter(ColorFilter cf) {
mPaint.setColorFilter(cf);
}
}
您可以使用GradientDrawable在android视图中添加圆角。 所以,
GradientDrawable gd = new GradientDrawable();
gd.setColor(Color.TRANSPARENT);
gd.setCornerRadius(15f);
gd.setStroke(1f,Color.BLACK);
yourImageView.setBackground(gd);
SmartImageView是从ImageView扩展的..所以您只需要从SmartImageView扩展即可
这是一个可行的解决方案(基于pskink代码和smartImageView lib)
创建一个新的班级
public class RoundedCornersSmartImageView extends SmartImageView{
private int RADIUS = 0;
private RectF mRect;
private Path mClip;
public RoundedCornersSmartImageView(Context context) {
super(context);
init();
}
public RoundedCornersSmartImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public RoundedCornersSmartImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
@Override
public void onDraw(Canvas canvas) {
Drawable dr = getDrawable();
if (dr != null) {
mRect.set(dr.getBounds());
getImageMatrix().mapRect(mRect);
mRect.offset(getPaddingLeft(), getPaddingTop());
mClip.reset();
mClip.addRoundRect(mRect, RADIUS, RADIUS, Path.Direction.CCW);
canvas.clipPath(mClip);
super.onDraw(canvas);
}
}
public void setRadius(int radius){
this.RADIUS = radius;
}
private void init(){
mRect = new RectF();
mClip = new Path();
}
}
在布局文件中,您的SmartimageView应该看起来像这样
<your.package.path.RoundedCornersSmartImageView
android:id="@+id/list_image"
android:layout_width="60dip"
android:layout_height="60dip"
android:src="@drawable/profile_anonyme_thumb"/>
..并以这种方式在代码中初始化视图
RoundedCornersSmartImageView thumb_image=(RoundedCornersSmartImageView) findViewById(R.id.list_image);
thumb_image.setRadius(4);
//SmartImageView methode
thumb_image.setImageUrl(bla.MY_THUMB_URL));
编辑半径以获得圆形图像..
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