Android development: Three ways to save pictures to albums

 /**
      * Save bitmap to local
      *
      * @param bitmap Bitmap
      */
    public static void saveBitmap(Bitmap bitmap, String path) {
        String savePath;
        File filePic;
        if (().equals(Environment.MEDIA_MOUNTED)) {
            savePath = path;
        } else {
            ("tag", "saveBitmap failure : sdcard not mounted");
            return;
        }
        try {
            filePic = new File(savePath);
            if (!()) {
                ().mkdirs();
                ();
            }
            FileOutputStream fos = new FileOutputStream(filePic);
            (, 100, fos);
            ();
            ();
        } catch (IOException e) {
            ("tag", "saveBitmap: " + ());
            return;
        }
        ("tag", "saveBitmap success: " + ());
    }

 
    /**
      * API 29 and below to save pictures to albums
      *
      * @param toBitmap Image to save
      */
    private void saveImage(Bitmap toBitmap) {
        String insertImage = (getContentResolver(), toBitmap, "wallpaper", "Save pictures after searching for cat-related pictures");
        if (!(insertImage)) {
            (this, "The picture was saved successfully!" + insertImage, Toast.LENGTH_SHORT).show();
            ("Print save path", insertImage + "-");
        }
    }

  /**
      * The latest way to save pictures to albums in API29
      */
    private void saveImage29(Bitmap toBitmap) {
        //Start a new process to save the image        Uri insertUri = getContentResolver().insert(.EXTERNAL_CONTENT_URI, new ContentValues());
        //Use use to automatically close the stream        try {
            OutputStream outputStream = getContentResolver().openOutputStream(insertUri, "rw");
            if ((, 90, outputStream)) {
                ("Save successfully", "success");
            } else {
                ("Save failed", "fail");
            }
        } catch (FileNotFoundException e) {
            ();
        }
    }

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import androidx..ViewPager2
import 
import .fragment_view_pager2_image.*
import .pager_photo_view.view.*
import 
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/**
  * Page showing carousel images and saving pictures
  */

class ViewPager2ImageFragment : Fragment() {
    companion object {
        const val REQUEST_WRITE_EXTERNAL_STORAGE_CODE = 1000
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return (.fragment_view_pager2_image, container, false)
    }

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        (savedInstanceState)
        val photoList = arguments?.getParcelableArrayList<PhotoItem>("photo_list")
        val currentPosition = arguments?.getInt("photo_position", 0)
        PagerPhotoListAdapter().apply {
             = this
            submitList(photoList)
        }
        //Set the swipe of the current page after the carousel picture        (object : () {
            override fun onPageSelected(position: Int) {
                (position)
                 =
                    StringBuffer().append(position + 1).append("/").append(photoList?.size)
            }
        })
        //Set the current page of ViewPager2 must be set after setting the data of ViewPager2, otherwise it will not take effect.        (currentPosition ?: 0, false)
        //Set the method of vertical scrolling         = ViewPager2.ORIENTATION_VERTICAL
        //How to save pictures         {
            if (.SDK_INT < 29 && (
                    requireContext(), .WRITE_EXTERNAL_STORAGE
                ) != PackageManager.PERMISSION_GRANTED
            ) {
                requestPermissions(
                    arrayOf<String>(.WRITE_EXTERNAL_STORAGE),
                    REQUEST_WRITE_EXTERNAL_STORAGE_CODE
                )
            } else {
                 { saveImage29() }
            }
        }
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        (requestCode, permissions, grantResults)
        if (requestCode == REQUEST_WRITE_EXTERNAL_STORAGE_CODE && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            //You can save the picture after the permission application is successful             { saveImage29() }
        }
    }

    /**
      * How to save pictures to albums
      * This method has been abandoned after API29
      */
    private fun saveImage() {
        val holder =
            (vp2Banner[0] as RecyclerView).findViewHolderForAdapterPosition() as 
        val toBitmap = ()
        val insertImage = (
            requireActivity().contentResolver, toBitmap, "wallpaper", "Save pictures after searching for cat-related pictures"
        )
        if (()) {
            (requireActivity(), "The picture is saved successfully！-${insertImage}", Toast.LENGTH_SHORT).show()
        } else {
            (requireActivity(), "Image saving failed！}", Toast.LENGTH_SHORT).show()
        }
    }

    /**
      * The latest way to save pictures to albums in API29
      */
    private suspend fun saveImage29() {
        //Start a new process to save the image        withContext() {
            val holder =
                (vp2Banner[0] as RecyclerView).findViewHolderForAdapterPosition() as 
            val toBitmap = ()
            val insertUri = requireActivity().(
                .EXTERNAL_CONTENT_URI, ContentValues()
            ) ?:  {
                showSaveToast("Save failed!")
                return@withContext
            }
            //Use use to automatically close the stream            requireActivity().(insertUri).use {
                if ((, 90, it)) {
                    showSaveToast("Save successfully!")
                } else {
                    showSaveToast("Save failed!")
                }
            }
        }
    }

    /**
      * Display the method of saving image results
      */
    private fun showSaveToast(showMsg: String) =
        MainScope().launch {
            (requireActivity(), showMsg, Toast.LENGTH_SHORT).show()
        }
}