Android实现图片下载并保存SD卡

一、首先获取图片

//第一种获取图片的方法

 String filePath = downloadUrl;
 //以下是取得图片的方法
 取得的是InputStream，直接从InputStream生成bitmap
 mBitmap = BitmapFactory.decodeStream(getImageStream(filePath))；

 public InputStream getImageStream(String path) throws Exception{
     URL url = new URL(path);
     HttpURLConnection conn = (HttpURLConnection) url.openConnection();
     conn.setConnectTimeout(5 * 1000);
     conn.setRequestMethod("GET");
     if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){
         return conn.getInputStream();
     }
     return null;
 }

//第二种获取图片的方法

 String filePath = downloadUrl;
 //以下是取得图片的方法
 取得的是byte数组, 从byte数组生成bitmap
 byte[] data = getImage(filePath);
 if(data!=null){
     mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
 }else{
     Toast.makeText(MainActivity.this, "Image error!", Toast.LENGTH_SHORT).show();
 }
 public byte[] getImage(String path) throws Exception{
     URL url = new URL(path);
     HttpURLConnection conn = (HttpURLConnection) url.openConnection();
     conn.setConnectTimeout(5 * 1000);
     conn.setRequestMethod("GET");
     InputStream inStream = conn.getInputStream();
     if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){
         return readStream(inStream);
     }
     return null;
 }
 public static byte[] readStream(InputStream inStream) throws Exception{
     ByteArrayOutputStream outStream = new ByteArrayOutputStream();
     byte[] buffer = new byte[1024];
     int len = 0;
     while( (len=inStream.read(buffer)) != -1){
         outStream.write(buffer, 0, len);
     }
     outStream.close();
     inStream.close();
     return outStream.toByteArray();
 }

二、保存图片

 **
  * 保存bitmap到SD卡
  * @param bitmap
  */
 public void saveBitmapToSDCard(Bitmap bitmap) {
     FileOutputStream fos = null;
     try {
         fos = new FileOutputStream(picPath);//picPath为保存SD卡路径
         if (fos != null) {
             bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
             fos.close();
         }
     } catch (Exception e) {
         e.printStackTrace();
     }
 }

源码下载地址:https://download.csdn.net/download/daxudada/10272805

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