android中几种常用的图片处理效果

在android开发中，出于美化界面需要，经常需要对图片进行处理，包括圆角、倒影等等，下面是网上搜集整理的代码：
Drawable转为Bitmap：通过getResource().getDrawable(id)可以得到drawable类型，有时需要将它转为bitmap图片格式进行处理.
public Bitmap drawableToBitmap(Drawable drawable){
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(width, height,
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0,0,width,height);
drawable.draw(canvas);
return bitmap;
}

缩放图片：
public static Bitmap zoomBitmap(Bitmap bitmap,float m){
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
matrix.postScale(m, m);
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
if( null != bitmap&& !bitmap.isRecycled())
bitmap.recycle();
return newbmp;
}

转圆角图片：
public 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(PorterDuff.Mode.SRC_IN));//此为关键，设置画笔与canvas已有图形的交互模式，PorterDuff.Mode有16种模式，在APIDemo中有示例。
canvas.drawBitmap(bitmap, rect, rect, paint);

if( null != bitmap&& !bitmap.isRecycled())
bitmap.recycle();
return output;
}

得到含倒影的图片：
public Bitmap createReflectionImageWithOrigin(Bitmap bitmap){
final float reflectionGap = (float) 0.4;
int width = bitmap.getWidth();
int height = bitmap.getHeight();

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

Bitmap reflectionImage = Bitmap.createBitmap(bitmap,
0, height/8, width, height/8, matrix, false);

Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/8), Config.ARGB_8888);

Canvas canvas = new Canvas(bitmapWithReflection);
canvas.drawBitmap(bitmap, 0, 0, null);
Paint deafalutPaint = new Paint();
canvas.drawRect(0, height,width,height + reflectionGap,
deafalutPaint);

canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0,
bitmap.getHeight(), 0, bitmapWithReflection.getHeight()
+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
// Draw a rectangle using the paint with our linear gradient
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);

if( null != bitmap&& !bitmap.isRecycled())
bitmap.recycle();
if( null != reflectionImage&& !reflectionImage.isRecycled())
reflectionImage.recycle();
return bitmapWithReflection;
}

更多相关文章

随机推荐