在 Android 中下载所有类型的图像格式答案

【问题标题】：Download all type of image format in Android在 Android 中下载所有类型的图像格式
【发布时间】：2015-09-19 07:11:06
【问题描述】：

我想从服务器下载图片。我尝试过使用下面的代码，但只下载 .png 格式的图片，仍然是 .jpeg、.gif、.bmp 等不是。有人可以帮助我如何在我的 Android 应用程序中下载所有类型的图像格式。在此先感谢。

这是我的下载方法

void download_PngFile(String fileUrl)
    {
        Log.e("In download_PngFile ", " str_imgList_imageaudioPath = " + imageName);
        Bitmap imagenObtenida = null;
        try {
            URL ImgUrl = new URL(fileUrl);
            HttpURLConnection conn = (HttpURLConnection) ImgUrl.openConnection();
            conn.connect();
            imagenObtenida = BitmapFactory.decodeStream(conn.getInputStream());
            Log.e("imagenObtenida", " = " + imagenObtenida);

            String fotoname = imageName;
            File file = new File(newFolder, fotoname);
            int sizeOfImage = (int) file.length();
            Log.e("sizeOfImage "," = "+ sizeOfImage +"@ "+ imageName);
            if (file.exists()) file.delete();
            try {
                FileOutputStream out = new FileOutputStream(file);
                imagenObtenida.compress(Bitmap.CompressFormat.PNG, 90, out);
                out.flush();
                out.close();
                Log.e("Png = ","DownLoad complete");

            } catch (Exception e) {

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

这是我检查的另一种方法，如果条件图像以 png、gif、bmp 和 jpeg 结尾

public void getDoenLoaddata()
        {
            Log.e("Record is exists !!", " == ");
            //CreateFile();
            dbhelper = new MyDbHelper(this);
            SQLiteDatabase db1 = dbhelper.getReadableDatabase();

            Cursor cursor = db1.rawQuery("select * from ActivityObjectList", null);

            if (cursor.moveToFirst())
            {
                do
                {
                    imageName = cursor.getString(cursor.getColumnIndex("imageaudioPath"));
                    String strDownLoadStatus = cursor.getString(cursor.getColumnIndex("DownLoad_Status"));
                    //Log.e("imageName ", "  = " + imageName + " & strDownLoadStatus is " + strDownLoadStatus);
                    if (strDownLoadStatus.equalsIgnoreCase("0"))
                    {
                        Log.e("Insert", " Status One");

                        if (imageName.endsWith(mp3_Pattern))
                        {
                            String str_Mp3Url = "http://103.24.4.60/CLASSNK1/MobileService.svc/DownloadFile/FileName/"+imageName;
                            Log.e("str_ImageUrl#####", "  = " + str_Mp3Url);

                            download_Mp3File(str_Mp3Url);
                            strDownLoadStatus = "1";
                            dbhelper.update_DownLoadStatus(imageName, strDownLoadStatus);
                        }

                        if (imageName.endsWith(png_Pattern))
                        {
                            Log.e("imageName", " Status One" + imageName);
                            String str_ImageUrl = "http://103.24.4.60/CLASSNK1/MobileService.svc/DownloadFile/FileName/"+imageName;
                            Log.e("png_Pattern  ", " str_ImageUrl = " + str_ImageUrl);
                            download_PngFile(str_ImageUrl);

                            strDownLoadStatus = "1";
                            dbhelper.update_DownLoadStatus(imageName, strDownLoadStatus);
                        }

                        if (imageName.endsWith(jpg_pattern))
                        {
                            String str_Mp3Url = "http://103.24.4.60/CLASSNK1/MobileService.svc/DownloadFile/FileName/"+imageName;
                            Log.e("str_ImageUrl#####", "  = " + str_Mp3Url);

                            download_Mp3File(str_Mp3Url);
                            strDownLoadStatus = "1";
                            dbhelper.update_DownLoadStatus(imageName, strDownLoadStatus);
                        }

                        if (imageName.endsWith(jpeg_pattern))
                        {
                            String str_Mp3Url = "http://103.24.4.60/CLASSNK1/MobileService.svc/DownloadFile/FileName/"+imageName;
                            Log.e("str_ImageUrl#####", "  = " + str_Mp3Url);

                            download_Mp3File(str_Mp3Url);
                            strDownLoadStatus = "1";
                            dbhelper.update_DownLoadStatus(imageName, strDownLoadStatus);
                        }

                        if (imageName.endsWith(gif_pattern))
                        {
                            String str_Mp3Url = "http://103.24.4.60/CLASSNK1/MobileService.svc/DownloadFile/FileName/"+imageName;
                            Log.e("str_ImageUrl#####", "  = " + str_Mp3Url);

                            download_Mp3File(str_Mp3Url);
                            strDownLoadStatus = "1";
                            dbhelper.update_DownLoadStatus(imageName, strDownLoadStatus);
                        }
                        if (imageName.endsWith(bmp_pattern))
                        {
                            String str_Mp3Url = "http://103.24.4.60/CLASSNK1/MobileService.svc/DownloadFile/FileName/"+imageName;
                            Log.e("str_ImageUrl#####", "  = " + str_Mp3Url);

                            download_Mp3File(str_Mp3Url);
                            strDownLoadStatus = "1";
                            dbhelper.update_DownLoadStatus(imageName, strDownLoadStatus);
                        }
                    }
                    else if (strDownLoadStatus.equalsIgnoreCase("1"))
                    {
                        // Log.e("Nothind To","Here !! ");
                    }

                } while (cursor.moveToNext());
            } cursor.close();
            db1.close();
           /* db1.close();*/
    }

【问题讨论】：

所以你想下载所有的图片并在以后从他们那里查询scard中的内容还是什么？
您是否在未阅读的情况下从某处复制粘贴了这些代码？第一个明确表示以 png 格式保存图像，第二个使用名为“Download_mp3file”的函数下载 images。

标签： android

【解决方案1】：

您应该尝试根据 mimetyes 搜索和查找您的文件。
在以下帖子中，您可以找到使用 MediaStore 查询图像媒体和非媒体的帮助，其次，当您需要再次使用 MediaStore 类从特定文件夹中查询时。
1.MediaStore - Uri to query all types of files (media and non-media)。
2.Displaying images from a specific folder on the SDCard using a gridview.

【讨论】：