图片保存到sd卡上，删除sd卡上的图片

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public  String saveImageToGallery(Context context, Bitmap bmp) {

        // 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory(), "saveImage");
        if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = System.currentTimeMillis() + ".jpg";
        File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 最后通知图库更新
//        String path = Environment.getExternalStorageDirectory() + "/saveImage/" + fileName;
//        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + path)));



        return Environment.getExternalStorageDirectory() + "/saveImage/" + fileName;
    }

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String s = saveImageToGallery(MainActivity.this, bitmap);
File deletefile = new File(s);
deletefile.delete();