Android 圖片特效處理的方法執行個體

1. 圖片放縮

複製代碼 代碼如下:// zoom 放縮
public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();

float scaleWidth = w / (float) width;
float scaleHeight = h / (float) height;
matrix.postScale(scaleWidth, scaleHeight);

Bitmap bitmap2 = Bitmap.createBitmap(bitmap, 0, 0, width, height,
matrix, true);
return bitmap2;
}

2. 獲得圓角圖片

複製代碼 代碼如下:// Round Corner Bitmap 獲得圓角圖片
public static Bitmap getRoundCornerBitmap(Bitmap bitmap, float roundPX /*圓角的半徑*/) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();

Bitmap bitmap2 = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap2);

final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, width, height);
final RectF rectF = new RectF(rect);

paint.setColor(color);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
canvas.drawRoundRect(rectF, roundPX, roundPX, paint);

paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);

return bitmap2;
}

3. 獲得帶倒影的圖片

複製代碼 代碼如下:// Reflect Bitmap 獲得帶倒影的圖片
public static Bitmap createReflectedBitmap(Bitmap bitmap) {
//倒影和圖片本身的間距
final int reflectedGap = 4;
int width = bitmap.getWidth();
int height = bitmap.getHeight();

Matrix matrix = new Matrix();
matrix.preScale(1, -1);

Bitmap reflectedImage = Bitmap.createBitmap(bitmap, 0, height / 2,
width, height / 2, matrix, false);
Bitmap reflectedBitmap = Bitmap.createBitmap(width,
(height + height / 2), Config.ARGB_8888);

Canvas canvas = new Canvas(reflectedBitmap);
canvas.drawBitmap(bitmap, 0, 0, null);
Paint defaultPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectedGap, defaultPaint);
canvas.drawBitmap(reflectedImage, 0, height + reflectedGap, null);

Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
reflectedBitmap.getHeight() + reflectedGap, 0x70ffffff,
0x00ffffff, TileMode.CLAMP);
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvas.drawRect(0, height, width, reflectedBitmap.getHeight()
+ reflectedGap, paint);

return reflectedBitmap;
}