RoundedBitmapDrawable剪裁

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一个Drawable，它包装一个位图，可以用圆角绘制。您可以从文件路径，输入流或Bitmap对象创建RoundedBitmapDrawable。

常用方法

  1. setCircular() 将图像形状设置为圆形
  2. setCornerRadius() 设置绘制位图时要应用的拐角半径。
  3. setGravity() 设置用于将位图放置在其边界内的重心。
  4. getBitmap() 返回此drawable用于渲染的位图。
  5. getIntrinsicHeight() 返回drawable的内在高度。
  6. setAlpha() 指定drawable的alpha值。

构造方法

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//导入 package android.support.v4.graphics.drawable;
RoundedBitmapDrawable rd = RoundedBitmapDrawableFactory.create(getResources(), bitmap);
RoundedBitmapDrawable rd = RoundedBitmapDrawableFactory.create(getResources(), "filePath");
RoundedBitmapDrawable rd = RoundedBitmapDrawableFactory.create(getResources(), inputStream);

基本使用

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/**
 * 获得圆形图片
 *
 * @param context
 * @param src
 * @return
 */
public static RoundedBitmapDrawable getCircleBitmap(Context context, Bitmap src) {
  	//获得正方形bitmap
    Bitmap scaledBitmap = getSquareBitmap(src, 0, 0);
    RoundedBitmapDrawable drawable = RoundedBitmapDrawableFactory.create(context.getResources(), scaledBitmap);
    drawable.setGravity(Gravity.CENTER);
  	//圆形
    drawable.setCircular(true);
	//判断是否是新bitmap,再回收
    if (!scaledBitmap.equals(src) && !scaledBitmap.isRecycled()) {
        scaledBitmap.recycle();
    }
    return drawable;
}
/**
 * 获得圆形带边框图片
 *
 * @param context
 * @param src
 * @return
 */
public static RoundedBitmapDrawable getCircleBorderBitmap(Context context, Bitmap src, int border, int color) {
 	 //获得正方形带边框的bitmap
    Bitmap scaledBitmap = getSquareBitmap(src, border, color);
    //圆形
    RoundedBitmapDrawable drawable = RoundedBitmapDrawableFactory.create(context.getResources(), scaledBitmap);
    drawable.setGravity(Gravity.CENTER);
    drawable.setCircular(true);
    if (!scaledBitmap.equals(src) && !scaledBitmap.isRecycled()) {
        scaledBitmap.recycle();
    }
    return drawable;
}
/**
 * 获取圆角图片
 *
 * @param context
 * @param src
 * @param radius
 * @return
 */
public static RoundedBitmapDrawable getRoundBitmap(Context context, Bitmap src, int radius) {
    RoundedBitmapDrawable drawable = RoundedBitmapDrawableFactory.create(context.getResources(), src);
  	//设置4个角的角度
    drawable.setCornerRadius(radius);
    return drawable;
}
/**
 * 获得正方形bitmap,居中剪裁
 *
 * @param src
 * @return
 */
public static Bitmap getSquareBitmap(Bitmap src, int border, int color) {
    int bitmapWidth = src.getWidth();
    int bitmapHeight = src.getHeight();
    int square = Math.min(bitmapHeight, bitmapWidth);
    if (bitmapWidth != bitmapHeight) {
        Bitmap scaledBitmap = Bitmap.createBitmap(square, square, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(scaledBitmap);
        //计算偏移的位置
        int x = square - bitmapWidth + border;
        int y = square - bitmapHeight + border;
        //居中的正方形
        if (border > 0) {
            Paint borderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            borderPaint.setStyle(Paint.Style.STROKE);
            borderPaint.setStrokeWidth(border);
            borderPaint.setColor(color);
            canvas.drawBitmap(src, x / 2, y / 2, null);
            //添加边框
            canvas.drawCircle(canvas.getWidth() / 2, canvas.getWidth() / 2, square / 2, borderPaint);
        } else {
            canvas.drawBitmap(src, x / 2, y / 2, null);
        }
        return scaledBitmap;
    } else {
        return src;
    }
}