Android的保存创建位图的目录在SD卡上 [英] Android Saving created bitmap to directory on sd card

问题描述

我创建了一个位图，现在我想的位图保存到某个目录里。谁能告诉我如何做到这一点。谢谢

I created a bitmap and now i want to save that bitmap to a directory somewhere. Can anyone show me how this is done. Thanks

FileInputStream in;
          BufferedInputStream buf;
           try {
                  in = new FileInputStream("/mnt/sdcard/dcim/Camera/2010-11-16_18-57-18_989.jpg");
                  buf = new BufferedInputStream(in);
                  Bitmap _bitmapPreScale = BitmapFactory.decodeStream(buf);
                  int oldWidth = _bitmapPreScale.getWidth();
                  int oldHeight = _bitmapPreScale.getHeight();
                  int newWidth = 2592; 
                  int newHeight = 1936;

                  float scaleWidth = ((float) newWidth) / oldWidth;
                  float scaleHeight = ((float) newHeight) / oldHeight;

                  Matrix matrix = new Matrix();
               // resize the bit map
                  matrix.postScale(scaleWidth, scaleHeight);
                  Bitmap _bitmapScaled = Bitmap.createBitmap(_bitmapPreScale, 0, 0,  oldWidth, oldHeight, matrix, true);

要保存_bitmapScaled到一个文件夹在我的SD卡

WANT TO SAVE _bitmapScaled to a folder on my SD card

推荐答案

您好，您可将数据写入的字节，然后创建要在SD卡文件夹中的文件与任何名和扩展名，然后写字节到该文件。 这将位图保存到SD卡。

Hi You can write data to bytes and then create a file in sdcard folder with whatever name and extension you want and then write the bytes to that file. This will save bitmap to sdcard.

ByteArrayOutputStream bytes = new ByteArrayOutputStream();
_bitmapScaled.compress(Bitmap.CompressFormat.JPEG, 40, bytes);

//you can create a new file name "test.jpg" in sdcard folder.
File f = new File(Environment.getExternalStorageDirectory()
                        + File.separator + "test.jpg")
f.createNewFile();
//write the bytes in file
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());

// remember close de FileOutput
fo.close();

这篇关于Android的保存创建位图的目录在SD卡上的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！