FileSelector.java

package com.freestyler.classnotebook.criss.helper;

import android.app.Activity;
import android.app.Dialog;
import android.graphics.Typeface;
import android.os.Environment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.io.File;
import java.util.ArrayList;

/**
 * Created by Javad on 2019-11-28 at 4:43 PM.
 */

public class FileSelector {

  private Activity context;
  private String[] extensions;
  private ArrayList<SelectedFile> itemsData = new ArrayList<>();
  public static final String MP4 = ".mp4", MP3 = ".mp3", JPG = ".jpg", JPEG = ".jpeg", PNG = ".png", DOC = ".doc", DOCX = ".docx", XLS = ".xls", XLSX = ".xlsx", PDF = ".pdf";


  public FileSelector(Activity context, String[] extensions) {
    this.context = context;
    this.extensions = extensions;
  }

  public interface OnSelectListener {
    void onSelect(String path);

  }

  public void selectFile(OnSelectListener listener) {
    String sdCard = Environment.getExternalStorageDirectory().getAbsolutePath();
    listOfFile(new File(sdCard));
    dialogFileList(listener);
  }

  private void listOfFile(File dir) {
    File[] list = dir.listFiles();

    for (File file : list) {
      if (file.isDirectory()) {
        if (!new File(file, ".nomedia").exists() && !file.getName().startsWith(".")) {
          Log.w("LOG", "IS DIR " + file);
          listOfFile(file);
        }
      } else {
        String path = file.getAbsolutePath();

        for (String ext : extensions) {
          if (path.endsWith(ext)) {
            SelectedFile selectedFile = new SelectedFile();

            selectedFile.path = path;
            String[] split = path.split("/");
            selectedFile.name = split[split.length - 1];
            itemsData.add(selectedFile);
            Log.i("LOG", "ADD " + selectedFile.path + " " + selectedFile.name);
          }
        }
      }
    }
    Log.d("LOG", itemsData.size() + " DONE");
  }

  private void dialogFileList(OnSelectListener listener) {
    LinearLayout lytMain = new LinearLayout(context);
    lytMain.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
    lytMain.setOrientation(LinearLayout.VERTICAL);
    int p = convertToPixels(12);
    lytMain.setPadding(p, p, p, p);
    lytMain.setGravity(Gravity.CENTER);

    TextView textView = new TextView(context);
    textView.setLayoutParams(new LinearLayout.LayoutParams(screenWidth(), ViewGroup.LayoutParams.WRAP_CONTENT));
    textView.setGravity(Gravity.CENTER);
    textView.setText("~JDM File Selecor~");

    RecyclerView recyclerView = new RecyclerView(context);

    lytMain.addView(textView);
    lytMain.addView(recyclerView);

    final Dialog dialog = new Dialog(context);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    // dialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
    dialog.setContentView(lytMain);
    dialog.setCancelable(true);
    dialog.show();

    AdapterFile adapter = new AdapterFile(dialog, listener, itemsData);
    recyclerView.setAdapter(adapter);
    LinearLayoutManager LayoutManager = new LinearLayoutManager(context);
    LayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    recyclerView.setLayoutManager(LayoutManager);
  }

  private int convertToPixels(int dp) {
    float scale = context.getResources().getDisplayMetrics().density;
    return (int) (dp * scale + 0.5f);
  }

  private int screenWidth() {
    return context.getResources().getDisplayMetrics().widthPixels;
  }

  private class SelectedFile {
    public String path = "";
    public String name = "";
  }

  private class AdapterFile extends RecyclerView.Adapter<AdapterFile.ViewHolder> {

    private ArrayList<SelectedFile> itemsData;
    private OnSelectListener listener;
    private Dialog dialog;

    public AdapterFile(Dialog dialog, OnSelectListener listener, ArrayList<SelectedFile> itemsData) {
      this.itemsData = itemsData;
      this.listener = listener;
      this.dialog = dialog;
    }

    // Create new views (invoked by the layout manager)
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

      LinearLayout linearLayout = new LinearLayout(context);
      linearLayout.setOrientation(LinearLayout.VERTICAL);
      TextView txtName = new TextView(context);
      TextView txtPath = new TextView(context);
      txtPath.setTypeface(txtPath.getTypeface(), Typeface.ITALIC);
      txtPath.setTextSize(TypedValue.COMPLEX_UNIT_SP, 11);

      linearLayout.addView(txtName);
      linearLayout.addView(txtPath);

      ViewHolder viewHolder = new ViewHolder(linearLayout);
      return viewHolder;
    }

    // inner class to hold a reference to each item of RecyclerView
    public class ViewHolder extends RecyclerView.ViewHolder {

      public LinearLayout linearLayout;
      public TextView txtName;
      public TextView txtPath;

      public ViewHolder(View itemLayoutView) {
        super(itemLayoutView);

        linearLayout = (LinearLayout) itemLayoutView;
        txtName = (TextView) linearLayout.getChildAt(0);
        txtPath = (TextView) linearLayout.getChildAt(1);
      }
    }


    @Override
    public int getItemCount() {
      return itemsData.size();
    }

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, final int position) {
      final SelectedFile selectedFile = itemsData.get(position);

      viewHolder.txtName.setText(selectedFile.name);
      viewHolder.txtPath.setText(selectedFile.path);

      viewHolder.linearLayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
          dialog.dismiss();
          listener.onSelect(selectedFile.path);
        }
      });
    }
  }
}