android - Android: 円形のドローアブル

Question

Drawable を円形にクリップするこのカスタム Drawable を作成しました。しかし、私の実装では、渡されたドローアブルは、循環形式ではなく元の形式で出力されます。

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;
    }
}

私の間違いは何ですか？

また、SquareImageview を使用して、onMeasure でビューを正方形にするこのドローアブルを表示しています。この質問は、円形のイメージビューを対象としたものではありません。

Answer 1

サポート ライブラリ v4 では、循環型ドローアブルの実装が既に最適化されています。

Google リファレンス

 /**
* 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 ....

Answer 2

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;
    }

}

Answer 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;
    }
}

Answer 4

使用している場合は、ハードウェア アクセラレーションを無効にしてみてくださいPorterDuffXfermode。

アクティビティ全体のマニフェスト:

<activity android:hardwareAccelerated="false" />

または、xfermode を使用している特定のビューで:

myView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);