android中Bitmap的放大和缩小实例代码

/**Bitmap放大的方法*/ 
private static Bitmap big(Bitmap bitmap) { 
Matrix matrix = new Matrix(); 
matrix.postScale(1.5f,1.5f); //长和宽放大缩小的比例 
Bitmap resizeBmp = Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true); 
return resizeBmp; 
} 
/**Bitmap缩小的方法*/ 
private static Bitmap small(Bitmap bitmap) { 
Matrix matrix = new Matrix(); 
matrix.postScale(0.8f,0.8f); //长和宽放大缩小的比例 
Bitmap resizeBmp = Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true); 
return resizeBmp; 
}