Android：指定分辨率和清晰度的图片压缩方法源码

http://www.wizzer.cn/?p=1792

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1. public void transImage(String fromFile, String toFile, int width, int height, int quality)  
2.     {  
3.         try  
4.         {  
5.             Bitmap bitmap = BitmapFactory.decodeFile(fromFile);  
6.             int bitmapWidth = bitmap.getWidth();  
7.             int bitmapHeight = bitmap.getHeight();  
8.             // 缩放图片的尺寸  
9.             float scaleWidth = (float) width / bitmapWidth;  
10.             float scaleHeight = (float) height / bitmapHeight;   
11.             Matrix matrix = new Matrix();  
12.             matrix.postScale(scaleWidth, scaleHeight);  
13.             // 产生缩放后的Bitmap对象  
14.             Bitmap resizeBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmapWidth, bitmapHeight, matrix, false);  
15.             // save file  
16.             File myCaptureFile = new File(toFile);  
17.             FileOutputStream out = new FileOutputStream(myCaptureFile);  
18.             if(resizeBitmap.compress(Bitmap.CompressFormat.JPEG, quality, out)){  
19.                 out.flush();  
20.                 out.close();  
21.             }  
22.             if(!bitmap.isRecycled()){  
23.                 bitmap.recycle();//记得释放资源，否则会内存溢出  
24.             }  
25.             if(!resizeBitmap.isRecycled()){  
26.                 resizeBitmap.recycle();  
27.             }  
28.   
29.         }  
30.         catch (FileNotFoundException e)  
31.         {  
32.             e.printStackTrace();  
33.         }  
34.         catch (IOException ex)  
35.         {  
36.             ex.printStackTrace();  
37.         }  
38.     }  

public void transImage(String fromFile, String toFile, int width, int height, int quality){try{Bitmap bitmap = BitmapFactory.decodeFile(fromFile);int bitmapWidth = bitmap.getWidth();int bitmapHeight = bitmap.getHeight();// 缩放图片的尺寸float scaleWidth = (float) width / bitmapWidth;float scaleHeight = (float) height / bitmapHeight; Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);// 产生缩放后的Bitmap对象Bitmap resizeBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmapWidth, bitmapHeight, matrix, false);// save fileFile myCaptureFile = new File(toFile);FileOutputStream out = new FileOutputStream(myCaptureFile);if(resizeBitmap.compress(Bitmap.CompressFormat.JPEG, quality, out)){out.flush();out.close();}if(!bitmap.isRecycled()){bitmap.recycle();//记得释放资源，否则会内存溢出}if(!resizeBitmap.isRecycled()){resizeBitmap.recycle();}}catch (FileNotFoundException e){e.printStackTrace();}catch (IOException ex){ex.printStackTrace();}}