位图周围的圆形边框

Question

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
    bitmap.getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
    final RectF rectF = new RectF(rect);
    final float roundPx = 12;

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;
}

我正在尝试使用此代码来舍入位图，但我不知道 Mode.SRC_in 和 Config.ARGB_8888 是什么。我对他们有错误。我应该在这里做什么？

Answer 1

对于PorterDuffXfermode，你必须写import android.graphics.PorterDuffXfermode;

对于Config.ARGB_8888，你必须写import android.graphics.Bitmap.Config;

否则直接按< kbd>CTRL + SHIFT + O 组织导入。

Answer 2

制作了一个椭圆形 xml，将其命名为 round_shape.xml

    <?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="oval" >
    <stroke
    android:width="1dp"
    android:color="#bebebe" />
    </shape>     

将此 xml 设置为图像视图的背景，如下所示

    <ImageView
                android:id="@+id/img_profile"
                android:layout_width="120dp"
                android:layout_height="120dp"
                android:padding="2dp"
                android:scaleType="fitXY"
                android:background="@drawable/round_shape"/>

现在您已将位图舍入并设置为 imagebitmap 资源，如下所示this img_profile.setImageBitmap(roundBit(selected_Pic_Bitmap)); ，对于舍入图像位图，请使用下面的代码

public Bitmap roundBit(Bitmap bm) {

    Bitmap circleBitmap = Bitmap.createBitmap(bm.getWidth(),
            bm.getHeight(), Bitmap.Config.ARGB_8888);

    BitmapShader shader = new BitmapShader(bm, TileMode.CLAMP,
            TileMode.CLAMP);
    Paint paint = new Paint();
    paint.setShader(shader);
    paint.setAntiAlias(true);
    Canvas c = new Canvas(circleBitmap);

    c.drawCircle(bm.getWidth() / 2, bm.getHeight() / 2, bm.getWidth() / 2,
            paint);

    return circleBitmap;
}