一、首先獲取圖片

//第一種獲取圖片的方法

 1 String filePath = downloadUrl;
 2 //以下是取得圖片的方法
 3 取得的是InputStream，直接從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 }

//第二種獲取圖片的方法

 1 String filePath = downloadUrl;
 2 //以下是取得圖片的方法
 3 取得的是byte數組, 從byte數組生成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、保存圖片

 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為保存SD卡路徑
 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 }

源碼下載地址:https://download.csdn.net/download/daxudada/10272805

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Android實現圖片下載並保存SD卡