How can I display images from a specific folder on android gallery

Question

How can I display all images from a specific folder on android gallery like, for example, whatapp does. I`m using MediaScannerConnectionClient

File folder =         


        

Answer 1

You can fetch image from specific folder on SDcard using my ways also delete the files.

MainActivity

    FileAdapter fileAdapter;
    RecyclerView recyclerView;
    ArrayList filePath = new ArrayList<>();
    ArrayList filename = new ArrayList<>();
    private File[] listFile;
    File file;


    recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    tv_empty =  findViewById(R.id.tv_empty);

    loadFiles();
    fileAdapter = new FileAdapter(this, filePath, filename);

    recyclerView.setLayoutManager(new GridLayoutManager(this, 3));
    recyclerView.setAdapter(fileAdapter);
    fileAdapter.notifyDataSetChanged();


    private void loadFiles() {
        if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            Toast.makeText(getActivity(), "Error! No SDCARD Found!", Toast.LENGTH_LONG).show();
        } else {
            file = new File(Environment.getExternalStorageDirectory().getPath() + "/StorySaver");
            if (!file.exists()) {
                file.mkdirs();
            }
        }

        filePath.clear();
        filename.clear();
        if (file.isDirectory()) {
            listFile = file.listFiles();
            for (File absolutePath : listFile) {
                filePath.add(absolutePath.getAbsolutePath());
                filename.add(absolutePath.getName());
            }
        }

        if (filePath.size() == 0) {
            tv_empty.setVisibility(View.VISIBLE);
        } else {
            tv_empty.setVisibility(View.GONE);
        }
    }

MyAdapter

public class FileAdapter extends RecyclerView.Adapter {
        ArrayList filepath;
        ArrayList filename;
        public Context mContext;
        File file;

        public class CustomViewHolder extends RecyclerView.ViewHolder {
            TextView content;
            ImageView imageView;

            public CustomViewHolder(final View view) {
                super(view);
                this.content = (TextView) view.findViewById(R.id.content);
                this.imageView = (ImageView) view.findViewById(R.id.image);
            }
        }

        public FileAdapter(Context context, ArrayList filepath, ArrayList filename) {
            this.filepath = filepath;
            this.filename = filename;
            this.mContext = context;
        }


        public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
            return new CustomViewHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row_file, null));
        }

        public void onBindViewHolder(CustomViewHolder customViewHolder, final int i) {
            file = new File(filepath.get(i));
            customViewHolder.content.setText(filename.get(i));
            Glide.with(this.mContext).load(filepath.get(i)).into(customViewHolder.imageView);
            customViewHolder.imageView.setOnLongClickListener(new OnLongClickListener() {
                public boolean onLongClick(View view) {
                    Builder builder = new Builder(mContext);
                    builder.setMessage("Are you sure you want delete this?");
                    builder.setPositiveButton("YES", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialogInterface, int v) {
                            if (file.exists()) {
                                file.delete();
                            }
                            filepath.remove(i);
                            notifyDataSetChanged();
                        }
                    });
                    builder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialogInterface, int i) {
                            dialogInterface.cancel();
                        }
                    });
                    builder.show();
                    return false;
                }
            });

            customViewHolder.imageView.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {

                    Intent intent = new Intent();
                    intent.setAction(android.content.Intent.ACTION_VIEW);
                    Uri data = FileProvider.getUriForFile(mContext, BuildConfig.APPLICATION_ID + ".provider", new File(filepath.get(i)));
                    intent.setDataAndType(data, "*/*");
                    try {
                        String substring = filename.get(i).substring(filename.get(i).lastIndexOf("."));

                        if (substring.equals(".jpg")) {
                            intent.setDataAndType(data, "image/*");
                        } else if (substring.equals(".mp4")) {
                            intent.setDataAndType(data, "video/*");
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                    try {
                        mContext.startActivity(intent);
                    } catch (ActivityNotFoundException unused) {
                        Toast.makeText(mContext, "No application available", Toast.LENGTH_SHORT).show();
                    }
                }
            });

        }

        public int getItemCount() {
            return filepath.size();
        }
    }