背景

我已經(jīng)看過(guò)如何用位圖創(chuàng)建一個(gè)圓形的drawable,以及如何在它周圍添加一個(gè)輪廓(AKA筆劃),here.

問(wèn)題

我無(wú)法找到如何在不繪制新位圖的情況下僅對(duì)位圖的某些角進(jìn)行舍入,而不是創(chuàng)建新的位圖,并且仍然可以用于中心裁剪ImageView.

我發(fā)現(xiàn)了什么

這是我發(fā)現(xiàn)的,但它確實(shí)創(chuàng)建了一個(gè)新的位圖,并在帶有center-crop的imageView中使用它(源here)：

/**

* Create rounded corner bitmap from original bitmap.

*

* @param input Original bitmap.

* @param cornerRadius Corner radius in pixel.

* @param squareTL,squareTR,squareBL,squareBR where to use square corners instead of rounded ones.

*/

public static Bitmap getRoundedCornerBitmap(final Bitmap input, final float cornerRadius, final int w, final int h,

final boolean squareTL, final boolean squareTR, final boolean squareBL, final boolean squareBR) {

final Bitmap output = Bitmap.createBitmap(w, h, Config.ARGB_8888);

final Canvas canvas = new Canvas(output);

final int color = 0xff424242;

final Rect rect = new Rect(0, 0, w, h);

final RectF rectF = new RectF(rect);

// make sure that our rounded corner is scaled appropriately

Paint paint = new Paint();

paint.setXfermode(null);

paint.setAntiAlias(true);

canvas.drawARGB(0, 0, 0, 0);

paint.setColor(color);

canvas.drawRoundRect(rectF, cornerRadius, cornerRadius, 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(PORTER_DUFF_XFERMODE_SRC_IN);

canvas.drawBitmap(input, 0, 0, paint);

return output;

}

而且,這是我發(fā)現(xiàn)創(chuàng)建一個(gè)可以在各個(gè)角落起作用的圓角可繪制的東西：

public static class RoundedCornersDrawable extends Drawable {

private final float mCornerRadius;

private final RectF mRect = new RectF();

private final BitmapShader mBitmapShader;

private final Paint mPaint;

public RoundedCornersDrawable(final Bitmap bitmap, final float cornerRadius) {

mCornerRadius = cornerRadius;

mBitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP,

Shader.TileMode.CLAMP);

mPaint = new Paint();

mPaint.setAntiAlias(false);

mPaint.setShader(mBitmapShader);

mRect.set(0, 0, bitmap.getWidth(), bitmap.getHeight());

}

@Override

protected void onBoundsChange(final Rect bounds) {

super.onBoundsChange(bounds);

mRect.set(0, 0, bounds.width(), bounds.height());

}

@Override

public void draw(final Canvas canvas) {

canvas.drawRoundRect(mRect, mCornerRadius, mCornerRadius, mPaint);

}

@Override

public int getOpacity() {

return PixelFormat.TRANSLUCENT;

}

@Override

public void setAlpha(final int alpha) {

mPaint.setAlpha(alpha);

}

@Override

public void setColorFilter(final ColorFilter cf) {

mPaint.setColorFilter(cf);

}

}

但是,如果imageView顯示內(nèi)容,同時(shí)保持與位圖相同的寬高比,并且其大小也是預(yù)先確定的,則此解決方案才有效.

這個(gè)問(wèn)題

如何創(chuàng)建一個(gè)中心裁剪的drawable,它顯示一個(gè)位圖,具有特定角落的圓角,并且還能夠顯示它周圍的輪廓/筆劃？

我想這樣做而不創(chuàng)建新的位圖或擴(kuò)展ImageView.僅使用具有位圖作為輸入的drawable.

總結(jié)

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