背景图像圆角

Question

我有一个改变的背景图像，在它上面我使用圆角。有没有办法隐藏图像的角落。下面是我的小部件的屏幕截图，其中显示了角落。

编辑代码：

Bitmap bm1 = BitmapFactory.decodeResource(context.getResources(), Utilities.getDrawableId(ACCUWX.Icons.AL_WIDGETBG_ICON_MAP[Integer.parseInt(wdm.iconCode)]));
Bitmap roundedBm = Utilities.getRoundedCornerBitmap(bm1);
toRet.setImageViewBitmap(R.id.widget_bg, roundedBm);

方法调用：

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;
      }

为了表明我有一个背景图像和顶部的圆角，由可绘制的 xml 形状制成：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/widget_bg_rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipChildren="true">
    <ImageView
        android:id="@+id/widget_bg"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/al_widgetbg_06_07_08"
        android:scaleType="center" />

    <LinearLayout 
        android:id="@+id/current_layout"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:focusable="true"
        android:weightSum="8">
        <RelativeLayout
            android:id="@+id/city_time_rl"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="2.5"
            android:background="@drawable/rounded_corners_top"
            android:clipChildren="true">
            <TextView
                android:id="@+id/city" 
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:text="MECHANICSBURG"
                android:textSize="16dp"
                android:textColor="@color/dk_blue"
                />

Answer 1

您应该能够通过在背景上绘制圆角矩形之前使背景透明来完成此操作。