一、首先获取图片 

//第一种获取图片的方法

 1 String filePath = downloadUrl; 2 //以下是取得图片的方法 3 取得的是InputStream，直接从InputStream生成bitmap  4 mBitmap = BitmapFactory.decodeStream(getImageStream(filePath))； 5  6 public InputStream getImageStream(String path) throws Exception{ 7     URL url = new URL(path); 8     HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 9     conn.setConnectTimeout(5 * 1000);10     conn.setRequestMethod("GET");11     if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){12         return conn.getInputStream();13     }14     return null;15 }

//第二种获取图片的方法

 1 String filePath = downloadUrl; 2 //以下是取得图片的方法 3 取得的是byte数组, 从byte数组生成bitmap 4 byte[] data = getImage(filePath); 5 if(data!=null){ 6     mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length); 7 }else{ 8     Toast.makeText(MainActivity.this, "Image error!", Toast.LENGTH_SHORT).show(); 9 }10 public byte[] getImage(String path) throws Exception{11     URL url = new URL(path);12     HttpURLConnection conn = (HttpURLConnection) url.openConnection();13     conn.setConnectTimeout(5 * 1000);14     conn.setRequestMethod("GET");15     InputStream inStream = conn.getInputStream();16     if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){17         return readStream(inStream);18     }19     return null;20 }21 public static byte[] readStream(InputStream inStream) throws Exception{22     ByteArrayOutputStream outStream = new ByteArrayOutputStream();23     byte[] buffer = new byte[1024];24     int len = 0;25     while( (len=inStream.read(buffer)) != -1){26         outStream.write(buffer, 0, len);27     }28     outStream.close();29     inStream.close();30     return outStream.toByteArray();31 }

二、保存图片

 1 ** 2  * 保存bitmap到SD卡 3  * @param bitmap 4  */ 5 public void saveBitmapToSDCard(Bitmap bitmap) { 6     FileOutputStream fos = null; 7     try { 8         fos = new FileOutputStream(picPath);//picPath为保存SD卡路径 9         if (fos != null) {10             bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);11             fos.close();12         }13     } catch (Exception e) {14         e.printStackTrace();15     }16 }

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