我这样做是为了获得一个圆形ImageView
,如何在它周围添加圆形边框,如下图所示:
public static Bitmap getRoundedShape(Bitmap scaleBitmapImage,int width) {
int targetWidth = width;
int targetHeight = width;
Bitmap targetBitmap = Bitmap.createBitmap(targetWidth,
targetHeight,Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(targetBitmap);
Path path = new Path();
path.addCircle(((float) targetWidth - 1) / 2,
((float) targetHeight - 1) / 2,
(Math.min(((float) targetWidth),
((float) targetHeight)) / 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, targetWidth, targetHeight), null);
return targetBitmap;
}
关于此功能,有一个非常有趣的帖子:http : //www.curious-creature.org/2012/12/11/android-recipe-1-image-with-rounded-corners/由Romain Guy(ex Google的android小组)。
您可以使用类似以下内容的示例:本示例创建带有白色描边的圆形位图。您可以更改它,添加带有黑色线条的白色笔划。
public class CircleDrawable extends Drawable {
private final BitmapShader mBitmapShader;
private final Paint mPaint;
private Paint mWhitePaint;
int circleCenterX;
int circleCenterY;
int mRadus;
private boolean mUseStroke = false;
private int mStrokePadding = 0;
public CircleDrawable(Bitmap bitmap) {
mBitmapShader = new BitmapShader(bitmap,
Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setShader(mBitmapShader);
}
public CircleDrawable(Bitmap bitmap, boolean mUseStroke) {
this(bitmap);
if (mUseStroke) {
this.mUseStroke = true;
mStrokePadding = 4;
mWhitePaint = new Paint();
mWhitePaint.setStyle(Paint.Style.FILL_AND_STROKE);
mWhitePaint.setStrokeWidth(0.75f);
mWhitePaint.setColor(Color.WHITE);
}
}
@Override
protected void onBoundsChange(Rect bounds) {
super.onBoundsChange(bounds);
circleCenterX = bounds.width() / 2;
circleCenterY = bounds.height() / 2;
if (bounds.width() >= bounds.height())
mRadus = bounds.width() / 2;
else
mRadus = bounds.height() / 2;
}
@Override
public void draw(Canvas canvas) {
if (mUseStroke) {
canvas.drawCircle(circleCenterX, circleCenterY, mRadus, mWhitePaint);
}
canvas.drawCircle(circleCenterX, circleCenterY, mRadus - mStrokePadding, 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);
}
public boolean ismUseStroke() {
return mUseStroke;
}
public void setmUseStroke(boolean mUseStroke) {
this.mUseStroke = mUseStroke;
}
}
本文收集自互联网,转载请注明来源。
如有侵权,请联系[email protected] 删除。
我来说两句