Question

我正在使用此代码来获取位图的顶部圆角

public static void setTopRounded(Bitmap workingBitmap , int w, int h, ImageView v,Context context)
{
    Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(bmp);
    Shader shader = new BitmapShader(workingBitmap, Shader.TileMode.MIRROR,
            Shader.TileMode.MIRROR);

    Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG);
    paint.setAntiAlias(true);
    paint.setShader(shader);
    RectF rec = new RectF(0, 0, w, h - 20);
    c.drawRect(new RectF(0, 20, w, h), paint);
    c.drawRoundRect(rec, 10, 10, paint);
    v.setBackgroundDrawable(new BitmapDrawable(context.getResources(), bmp));
}

我的图像视图的XML代码是

<ImageView 
    android:layout_height="140dp"
    android:layout_width="match_parent"
    android:id="@+id/profileIV"
    android:visibility="gone"
    android:scaleType="centerCrop" />

现在的问题是设置

v.setBackgroundDrawable(new BitmapDrawable(context.getResources(), bmp))， android:scaleType="centerCrop"

属性不起作用，如果我使用

v.setImageDrawable(new BitmapDrawable(context.getResources(), bmp))

然后缩放类型可以工作，但图像不会被舍入。我做错了什么？

Answer 1

尝试使用v.setImageBitmap(bmp)

Answer 2

/**
     * This method used for bitmap compress and rounded corner
     * @param Bitmap object
     * @param pixels
     * @return nothing 
     */
    public static Bitmap getRoundedRectBitmap(final Bitmap bitmap,final  int pixels)
    {
        int color;
        float roundPx;
        final Bitmap    result = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
        final Canvas canvas = new Canvas(result);
        color = 0xff424242;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        final RectF rectF = new RectF(rect);
        roundPx = pixels;
        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 result;
    }

//像这样调用上面的方法

profileImage.setImageBitmap（getRoundedRectBitmap（bitmap，50））;

Answer 3

我找到了答案。我没有改变任何事情。对顶部圆角图像使用相同的功能，并在图像视图中使用位图作为背景。但现在使用ThumbnailUtils

在imageView的代码中进行CenterCrop

首先我使用下面的函数来获得缩放的CenterCroped图像

Bitmap resizedProfileBitmap = ThumbnailUtils.extractThumbnail(profileBitmap, voucherTitleRLT.getWidth(), height);

然后使用顶部圆角函数获取顶部圆角中心的图像作为imageview的背景，如下所示

setTopRounded(resizedProfileBitmap, resizedProfileBitmap.getWidth(), resizedProfileBitmap.getHeight(), profileIV, thisContext);

Answer 4

您可以通过创建Shape Drawable并将其设置为ImageView的背景，以XML格式执行此操作。本文介绍了如何：http://www.techrepublic.com/article/pro-tip-round-corners-on-an-android-imageview-with-this-hack/#

你的形状可以看起来像这样：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">

<solid android:color="#00ffffff" />
<padding
    android:left="1dp"
    android:top="1dp"
    android:right="1dp"
    android:bottom="1dp" />
<corners
    android:topLeftRadius="6dp"
    android:topRightRadius="6dp"
    android:bottomLeftRadius="0.1dp"
    android:bottomRightRadius="0.1dp" />
<stroke
    android:width="6dp"
    android:color="#ffffffff" />

位图android的圆角顶角

4 个答案: