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November 13, 2021 01:29
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package com.example; | |
import android.content.Context; | |
import android.graphics.*; | |
import android.util.AttributeSet; | |
import android.util.DisplayMetrics; | |
import android.util.TypedValue; | |
import android.widget.FrameLayout; | |
public class RoundedCornerLayout extends FrameLayout { | |
private final static float CORNER_RADIUS = 40.0f; | |
private Bitmap maskBitmap; | |
private Paint paint, maskPaint; | |
private float cornerRadius; | |
public RoundedCornerLayout(Context context) { | |
super(context); | |
init(context, null, 0); | |
} | |
public RoundedCornerLayout(Context context, AttributeSet attrs) { | |
super(context, attrs); | |
init(context, attrs, 0); | |
} | |
public RoundedCornerLayout(Context context, AttributeSet attrs, int defStyle) { | |
super(context, attrs, defStyle); | |
init(context, attrs, defStyle); | |
} | |
private void init(Context context, AttributeSet attrs, int defStyle) { | |
DisplayMetrics metrics = context.getResources().getDisplayMetrics(); | |
cornerRadius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, CORNER_RADIUS, metrics); | |
paint = new Paint(Paint.ANTI_ALIAS_FLAG); | |
maskPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG); | |
maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR)); | |
setWillNotDraw(false); | |
} | |
@Override | |
public void draw(Canvas canvas) { | |
Bitmap offscreenBitmap = Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(), Bitmap.Config.ARGB_8888); | |
Canvas offscreenCanvas = new Canvas(offscreenBitmap); | |
super.draw(offscreenCanvas); | |
if (maskBitmap == null) { | |
maskBitmap = createMask(canvas.getWidth(), canvas.getHeight()); | |
} | |
offscreenCanvas.drawBitmap(maskBitmap, 0f, 0f, maskPaint); | |
canvas.drawBitmap(offscreenBitmap, 0f, 0f, paint); | |
} | |
private Bitmap createMask(int width, int height) { | |
Bitmap mask = Bitmap.createBitmap(width, height, Bitmap.Config.ALPHA_8); | |
Canvas canvas = new Canvas(mask); | |
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); | |
paint.setColor(Color.WHITE); | |
canvas.drawRect(0, 0, width, height, paint); | |
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR)); | |
canvas.drawRoundRect(new RectF(0, 0, width, height), cornerRadius, cornerRadius, paint); | |
return mask; | |
} | |
} |
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Use this like a normal layout:
<com.example.RoundedCornerLayout
android:layout_width="200dp"
android:layout_height="200dp">
</com.example.RoundedCornerLayout>