Android之图片处理

Android之图片处理（图片合成、图片圆角、图片翻转、图片缩放）

图片合成

/**

* 图片合成

* @param bitmap

* @return

*/

private Bitmap createBitmap( Bitmap src, Bitmap watermark ) {

if( src == null ) {

return null;

}

int w = src.getWidth();

int h = src.getHeight();

int ww = watermark.getWidth();

int wh = watermark.getHeight();

//create the new blank bitmap

Bitmap newb = Bitmap.createBitmap( w, h, Config.ARGB_8888 );//创建一个新的和SRC长度宽度一样的位图

Canvas cv = new Canvas( newb );

//draw src into

cv.drawBitmap( src, 0, 0, null );//在 0，0坐标开始画入src

//draw watermark into

cv.drawBitmap( watermark, w - ww + 5, h - wh + 5, null );//在src的右下角画入水印

//save all clip

cv.save( Canvas.ALL_SAVE_FLAG );//保存

//store

cv.restore();//存储

return newb;

}

图片圆角

/**

* 图片圆角

* @param bitmap

* @return

*/

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;

}

图片缩放、翻转和旋转

/**

* 缩放、翻转和旋转图片

* @param bmpOrg

* @param rotate

* @return

*/

private android.graphics.Bitmap gerZoomRotateBitmap(

android.graphics.Bitmap bmpOrg, int rotate) {

// 获取图片的原始的大小

int width = bmpOrg.getWidth();

int height = bmpOrg.getHeight();

int newWidth = 300;

int newheight = 300;

// 定义缩放的高和宽的比例

float sw = ((float) newWidth) / width;

float sh = ((float) newheight) / height;

// 创建操作图片的用的Matrix对象

android.graphics.Matrix matrix = new android.graphics.Matrix();

// 缩放翻转图片的动作

// sw sh的绝对值为绽放宽高的比例，sw为负数表示X方向翻转，sh为负数表示Y方向翻转

matrix.postScale(sw, sh);

// 旋转30*

matrix.postRotate(rotate);

//创建一个新的图片

android.graphics.Bitmap resizeBitmap = android.graphics.Bitmap

.createBitmap(bmpOrg, 0, 0, width, height, matrix, true);

return resizeBitmap;

}