android 自定义圆形的ImageView
16lz
2021-01-23
定义类：
public class MLRoundedImageView extends android.support.v7.widget.AppCompatImageView { public MLRoundedImageView(Context context) { super(context); } public MLRoundedImageView(Context context, AttributeSet attrs) { super(context, attrs); } public MLRoundedImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) { Bitmap sbmp; if (bmp.getWidth() != radius || bmp.getHeight() != radius) { float smallest = Math.min(bmp.getWidth(), bmp.getHeight()); float factor = smallest / radius; sbmp = Bitmap.createScaledBitmap(bmp, (int) (bmp.getWidth() / factor), (int) (bmp.getHeight() / factor), false); } else { sbmp = bmp; } Bitmap output = Bitmap.createBitmap(radius, radius, Config.ARGB_8888); Canvas canvas = new Canvas(output); //final int color = 0xffa19774; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, radius, radius); paint.setAntiAlias(true); paint.setFilterBitmap(true); paint.setDither(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(Color.parseColor("#BAB399")); canvas.drawCircle(radius / 2 + 0.7f, radius / 2 + 0.7f, radius / 2 + 0.1f, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(sbmp, rect, rect, paint); return output; } @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 radius = getWidth(), h = getHeight(); Bitmap roundBitmap = getCroppedBitmap(bitmap, radius); canvas.drawBitmap(roundBitmap, 0, 0, null); }}在布局文件中使用：
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