Example of saving picture to album function implemented by Android

//Click the picture to save
imageView.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
    String[] PERMISSIONS = {
        "android.permission.READ_EXTERNAL_STORAGE",
        "android.permission.WRITE_EXTERNAL_STORAGE" };
    //Check whether there is write permission
    int permission = ContextCompat.checkSelfPermission(MainActivity.this,
        "android.permission.WRITE_EXTERNAL_STORAGE");
    if (permission != PackageManager.PERMISSION_GRANTED) {
      //There is no permission to write. To apply for the permission to write, a dialog box will pop up
      ActivityCompat.requestPermissions(MainActivity.this, PERMISSIONS,1);
    }
    try {
      //Create the savephoto class to save the picture
      SavePhoto savePhoto = new SavePhoto(MainActivity.this);
      savePhoto.SaveBitmapFromView(imageView);
    } catch (ParseException e) {
      e.printStackTrace();
    }
  }
});

public class SavePhoto{
  //Save the activity calling this class
  Context context;
  public SavePhoto(Context context) {
    this.context = context;
  }
  //How to save a file:
  public void SaveBitmapFromView(View view) throws ParseException {
    int w = view.getWidth();
    int h = view.getHeight();
    Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(bmp);
    view.layout(0, 0, w, h);
    view.draw(c);
    //Shrink picture
    Matrix matrix = new Matrix();
    Matrix. Postscale (0.5f, 0.5f); // the ratio of length and width to zoom in and out
    bmp = Bitmap.createBitmap(bmp,0,0,bmp.getWidth(),bmp.getHeight(),matrix,true);
    DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
    saveBitmap(bmp,bmp.toString() + ".JPEG");
  }
  /*
   *Save the file named current date
   */
  public void saveBitmap(Bitmap bitmap, String bitName){
    String fileName ;
    File file ;
    If (build. Brand. Equals ("Xiaomi") {// Xiaomi Mobile
      fileName = Environment.getExternalStorageDirectory().getPath()+"/DCIM/Camera/"+bitName ;
    }else{ // Meizu 、Oppo
      Log.v("qwe","002");
      fileName = Environment.getExternalStorageDirectory().getPath()+"/DCIM/"+bitName ;
    }
    file = new File(fileName);
    if(file.exists()){
      file.delete();
    }
    FileOutputStream out;
    try{
      out = new FileOutputStream(file);
      //The format is JPEG, the picture taken by the camera is JPEG, and PNG cannot be displayed in the album
      if(bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out))
      {
        out.flush();
        out.close();
        //Insert Gallery
        MediaStore.Images.Media.insertImage(context.getContentResolver(), file.getAbsolutePath(), bitName, null);
      }
    }
    catch (FileNotFoundException e)
    {
      e.printStackTrace();
    }
    catch (IOException e)
    {
      e.printStackTrace();
    }
    //Send a broadcast to refresh the display of the gallery
    context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + fileName)));
  }
}