一、網路URL圖片地址轉Bitmap

 public  Bitmap getBitmap(String imgUrl) {
        InputStream inputStream=null;
        ByteArrayOutputStream outputStream=null;
        URL url = null;
        try {
            url=new URL(imgUrl);
            HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection
 
();
            httpURLConnection.setRequestMethod("GET");
            httpURLConnection.setReadTimeout(2000);
            httpURLConnection.connect();
            if(httpURLConnection.getResponseCode()==200) {
            	//網路連線成功
                inputStream = httpURLConnection.getInputStream();
                outputStream =
 
 new ByteArrayOutputStream();
                byte buffer[] = new byte[1024 * 8];
                int len = -1;
                while ((len = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, len);
                }
                byte[] bu = outputStream.toByteArray
 
();
                Bitmap bitmap = BitmapFactory.decodeByteArray(bu, 0, bu.length);
                return bitmap;
            }else {
               Log.(TAG,"網路連線失敗----"+httpURLConnection.getResponseCode())
            }
        } catch (Exception e) {
            // TODO: handle exception
        }finally{
            if(inputStream!=null){
                try {
                    inputStream.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            if(outputStream!=null){
                try {
                    outputStream.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

溫馨提示：這裡需要一個執行緒去訪問

二、儲存圖片到本地

 public void saveImageToGallery(Bitmap bmp) {
        if (bmp==null){
            Log.e(TAG,"bitmap---為空")
            return ;
        }
        String galleryPath= Environment.getExternalStorageDirectory()
                + File.separator + Environment.DIRECTORY_DCIM
                +File.separator+"Camera"+File.separator;
        String fileName = +System.currentTimeMillis() + ".jpg";
        File file = new File(galleryPath, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            //通過io流的方式來壓縮儲存圖片
            boolean isSuccess = bmp.compress(Bitmap.CompressFormat.JPEG, 60, fos);
            fos.flush();
            fos.close();
            //儲存圖片後傳送廣播通知更新資料庫
            Uri uri = Uri.fromFile(file);
            mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
            if (isSuccess) {
               Log.e(TAG,"圖片儲存成功 儲存在:" + file.getPath()));
            } else {
                 Log.e(TAG,"圖片儲存失敗"));
            }
        } catch (IOException e) {
             Log.e(TAG,"儲存圖片找不到資料夾");
            e.printStackTrace();
        }
    }

溫馨提示：
儲存圖片的時候記得加上請求許可權喲

  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

大功告成！！！！！