Android 快速将一个Bitmap变成圆形或圆角矩形 kotlin

• Bitmap转圆形Drawable
• Bitmap转圆角Drawable
• 完事

Bitmap转圆形Drawable

新建文件CircleImageDrawable

class CircleImageDrawable(mBitmap: Bitmap) : Drawable() {    private val mPaint: Paint    private val mWidth: Int    init {        val bitmapShader = BitmapShader(            mBitmap, TileMode.CLAMP,            TileMode.CLAMP        )        mPaint = Paint()        mPaint.isAntiAlias = true        mPaint.shader = bitmapShader        mWidth = mBitmap.width.coerceAtMost(mBitmap.height)    }    override fun draw(canvas: Canvas) {        canvas.drawCircle(mWidth / 2.toFloat(), mWidth / 2.toFloat(), mWidth / 2.toFloat(), mPaint)    }    override fun getIntrinsicWidth(): Int {        return mWidth    }    override fun getIntrinsicHeight(): Int {        return mWidth    }    override fun setAlpha(alpha: Int) {        mPaint.alpha = alpha    }    override fun setColorFilter(cf: ColorFilter?) {        mPaint.colorFilter = cf    }    override fun getOpacity(): Int {        return PixelFormat.TRANSLUCENT    }}

使用：

imgUser.setImageDrawable(CircleImageDrawable(bitmap))

Bitmap转圆角Drawable

新建文件RoundImageDrawable

class RoundImageDrawable(mBitmap: Bitmap, radius: Float) : Drawable() {    private val mPaint: Paint    private val mWidth: Int    private val mRadius: Float    init {        val bitmapShader = BitmapShader(            mBitmap, Shader.TileMode.CLAMP,            Shader.TileMode.CLAMP        )        mPaint = Paint()        mPaint.isAntiAlias = true        mPaint.shader = bitmapShader        mWidth = mBitmap.width.coerceAtMost(mBitmap.height)        mRadius = radius    }    override fun draw(canvas: Canvas) {        canvas.drawRoundRect(0f, 0f, mWidth.toFloat(), mWidth.toFloat(), mRadius, mRadius, mPaint)    }    override fun getIntrinsicWidth(): Int {        return mWidth    }    override fun getIntrinsicHeight(): Int {        return mWidth    }    override fun setAlpha(alpha: Int) {        mPaint.alpha = alpha    }    override fun setColorFilter(cf: ColorFilter?) {        mPaint.colorFilter = cf    }    override fun getOpacity(): Int {        return PixelFormat.TRANSLUCENT    }}

使用：

imgUser.setImageDrawable(RoundImageDrawable(bitmap, 12f))

完事

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