添加图像圆形图像android的边框

Question

我有什么 ::我有一个Imageview,我使用picassso将图像作为一个圆圈

我该怎么做 ::我想使用我当前的实现为圆形图像添加黑色边框,如何在不使用第三方库的情况下实现此目的

Picasso.with(this)
.load("http://i.imgur.com/DvpvklR.png")
.transform(new RoundedTransformation(50, 4))
.resize(100, 100)
.centerCrop().into(imageView1);

RoundedTransformation.java

// enables hardware accelerated rounded corners
// original idea here : http://www.curious-creature.org/2012/12/11/android-recipe-1-image-with-rounded-corners/
public class RoundedTransformation implements com.squareup.picasso.Transformation {
    private final int radius;
    private final int margin;  // dp

    // radius is corner radii in dp
    // margin is the board in dp
    public RoundedTransformation(final int radius, final int margin) {
        this.radius = radius;
        this.margin = margin;
    }

    @Override
    public Bitmap transform(final Bitmap source) {
        final Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setShader(new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));

        Bitmap output = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        canvas.drawRoundRect(new RectF(margin, margin, source.getWidth() - margin, source.getHeight() - margin), radius, radius, paint);

        if (source != output) {
            source.recycle();
        }

        return output;
    }

    @Override
    public String key() {
        return "rounded";
    }
}

编辑

public class RoundedTransformation implements com.squareup.picasso.Transformation {
    private final int radius;
    private final int margin;  // dp

    // radius is corner radii in dp
    // margin is the board in dp
    public RoundedTransformation(final int radius, final int margin) {
        this.radius = radius;
        this.margin = margin;
    }

    @Override
    public Bitmap transform(final Bitmap source) {


        final Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setShader(new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));

        Bitmap output = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        canvas.drawRoundRect(new RectF(margin, margin, source.getWidth() - margin, source.getHeight() - margin), radius, radius, paint);

        if (source != output) {
            source.recycle();
        }

        Paint paint1 = new Paint();      
        paint1.setColor(Color.RED);
        paint1.setStyle(Style.STROKE);
        paint1.setAntiAlias(true);
        paint1.setStrokeWidth(2);
        canvas.drawCircle((source.getWidth() - margin)/2, (source.getHeight() - margin)/2, radius-2, paint1);


        return output;
    }

    @Override
    public String key() {
        return "rounded";
    }
}

Answer 1

最后的转型课,多亏了黑带

public class RoundedTransformation implements com.squareup.picasso.Transformation {
    private final int radius;
    private final int margin;  // dp

    // radius is corner radii in dp
    // margin is the board in dp
    public RoundedTransformation(final int radius, final int margin) {
        this.radius = radius;
        this.margin = margin;
    }

    @Override
    public Bitmap transform(final Bitmap source) {


        final Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setShader(new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));

        Bitmap output = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        canvas.drawCircle((source.getWidth() - margin)/2, (source.getHeight() - margin)/2, radius-2, paint);

        if (source != output) {
            source.recycle();
        }

        Paint paint1 = new Paint();      
        paint1.setColor(Color.RED);
        paint1.setStyle(Style.STROKE);
        paint1.setAntiAlias(true);
        paint1.setStrokeWidth(2);
        canvas.drawCircle((source.getWidth() - margin)/2, (source.getHeight() - margin)/2, radius-2, paint1);


        return output;
    }

    @Override
    public String key() {
        return "rounded";
    }
}

Answer 2

你可以使用drawCircle另一个Paint object.例如:

Paint paint = new Paint();      
paint.setColor(Color.RED);
paint.setStyle(Style.STROKE);
paint.setAntiAlias(true);
paint.setStrokeWidth(2);
canvas.drawCircle((source.getWidth() - margin)/2, (source.getHeight() - margin)/2, radius-2, paint);

此外,drawRoundRect您可以使用而不是使用a 绘制圆圈drawCircle