android Bitmap圓角與倒影的具體實現代碼

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複製代碼 代碼如下:/**
* 畫一個圓角圖
*
* @param bitmap
* @param roundPx
* @return
*/
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
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);
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;
}

/**
* 建立倒影效果
*
* @return
*/
public boolean createReflectedImages() {
// 倒影圖和原圖之間的距離
final int reflectionGap = 4;
int index = 0;
for (GalleryWith3DData imageId : mImageIds) {
// 返回原圖解碼之後的bitmap對象
Bitmap originalImage = BitmapFactory.decodeResource(
mContext.getResources(), imageId.getInteger());
int width = originalImage.getWidth();
int height = originalImage.getHeight();
// 建立矩陣對象
Matrix matrix = new Matrix();
// 指定矩陣(x軸不變，y軸相反)
matrix.preScale(1, -1);
// 將矩陣應用到該原圖之中，返回一個寬度不變，高度為原圖1/2的倒影位元影像
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
height / 2, width, height / 2, matrix, false);
// 建立一個寬度不變，高度為原圖+倒影圖高度的位元影像
Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
(height + height / 2), Config.ARGB_8888);
// 將上面建立的位元影像初始化到畫布
Canvas canvas = new Canvas(bitmapWithReflection);
canvas.drawBitmap(getRoundedCornerBitmap(originalImage, 20), 0, 0,
null);
int len = imageId.getstr().length();
double lenWeght = len * 50 * 0.9;
int ban = width / 2;
int ban1 = (int) (lenWeght / 2);
int hua = ban - ban1;
if (imageId.getFlagRecommend()) {
canvas.rotate(30);
canvas.drawText(mStrRecommend, hua - 20, 150,
createPaint(Color.RED));
canvas.rotate(-30);
}
Paint deafaultPaint = new Paint();
deafaultPaint.setAntiAlias(false);
canvas.drawBitmap(getRoundedCornerBitmap(reflectionImage, 20), 0,
height + reflectionGap, null);
Paint paint = new Paint();
paint.setAntiAlias(false);
/**
* 參數一:為漸層起初點座標x位置， 參數二:為y軸位置， 參數三和四:分辨對應漸層終點， 最後參數為平鋪方式，
* 這裡設定為鏡像Gradient是基於Shader類，所以我們通過Paint的setShader方法來設定這個漸層
*/
LinearGradient shader = new LinearGradient(0,
originalImage.getHeight(), 0,
bitmapWithReflection.getHeight() + reflectionGap,
0x70ffffff, 0x00ffffff, TileMode.MIRROR);
// 設定陰影
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(
android.graphics.PorterDuff.Mode.DST_IN));
// 用已經定義好的畫筆構建一個矩形陰影漸層效果
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);
canvas.drawText(imageId.getstr(), hua, 430,
createPaint(Color.WHITE));
// 建立一個ImageView用來顯示已經畫好的bitmapWithReflection
ImageView imageView = new ImageView(mContext);
imageView.setImageBitmap(bitmapWithReflection);
// 設定imageView大小 ，也就是最終顯示的圖片大小
imageView.setLayoutParams(new GalleryWith3D.LayoutParams(150, 250));
// imageView.setScaleType(ScaleType.MATRIX);
mImages[index++] = imageView;
}
return true;
}

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