bitmap = bitmap.createBitmap(bitmap,0,70,bitmap.getWidth(),bitmap.getHeight()/3);
Matrix matrix = new Matrix();
matrix.postScale(2.0f, 0.5f);
bitmap = bitmap.createBitmap(bitmap,0,0,bitmap.getWidth()/2,bitmap.getHeight(),matrix,false);用Matrix来改变裁剪图片的寬高
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原文：http://blog.csdn.net/heqiangflytosky/article/details/47319515