fedilab-Android-App/app/src/main/java/app/fedilab/android/filelister/FileListerDialog.java

package app.fedilab.android.filelister;

import android.content.Context;
import android.content.DialogInterface;
import android.view.View;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;

import java.io.File;


import app.fedilab.android.R;

import static android.content.DialogInterface.BUTTON_NEGATIVE;
import static android.content.DialogInterface.BUTTON_NEUTRAL;
import static android.content.DialogInterface.BUTTON_POSITIVE;

/**
 * A File Lister Dialog
 */

public class FileListerDialog {

    /**
     * File Filter for the FileListerDialog
     */
    public enum FILE_FILTER {
        /**
         * List All Files
         */
        ALL_FILES,
        /**
         * List only directories
         */
        DIRECTORY_ONLY,
        /**
         * List Directory and Image files
         */
        IMAGE_ONLY,
        /**
         * List Directory and Video files
         */
        VIDEO_ONLY,
        /**
         * List Directory and Audio files
         */
        AUDIO_ONLY
    }

    private AlertDialog alertDialog;

    private FilesListerView filesListerView;

    private OnFileSelectedListener onFileSelectedListener;

    private FileListerDialog(@NonNull Context context) {
        //super(context);
        alertDialog = new AlertDialog.Builder(context).create();
        init(context);
    }

    private FileListerDialog(@NonNull Context context, int themeResId) {
        //super(context, themeResId);
        alertDialog = new AlertDialog.Builder(context, themeResId).create();
        init(context);
    }

    /**
     * Creates a default instance of FileListerDialog
     *
     * @param context Context of the App
     * @return Instance of FileListerDialog
     */
    public static FileListerDialog createFileListerDialog(@NonNull Context context) {
        return new FileListerDialog(context);
    }

    /**
     * Creates an instance of FileListerDialog with the specified Theme
     *
     * @param context Context of the App
     * @param themeId Theme Id for the dialog
     * @return Instance of FileListerDialog
     */
    public static FileListerDialog createFileListerDialog(@NonNull Context context, int themeId) {
        return new FileListerDialog(context, themeId);
    }

    private void init(Context context) {
        filesListerView = new FilesListerView(context);
        alertDialog.setView(filesListerView);
        alertDialog.setButton(BUTTON_POSITIVE, context.getString(R.string.select), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();
                if (onFileSelectedListener != null)
                    onFileSelectedListener.onFileSelected(filesListerView.getSelected(), filesListerView.getSelected().getAbsolutePath());
            }
        });
        alertDialog.setButton(BUTTON_NEUTRAL, context.getString(R.string.default_directory), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                //filesListerView.goToDefaultDir();
            }
        });
        alertDialog.setButton(BUTTON_NEGATIVE, context.getString(R.string.cancel), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();
            }
        });
    }

    /**
     * Display the FileListerDialog
     */
    public void show() {
        //getWindow().setLayout(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT);
        switch (filesListerView.getFileFilter()) {
            case DIRECTORY_ONLY:
                alertDialog.setTitle("Select a directory");
                break;
            case VIDEO_ONLY:
                alertDialog.setTitle("Select a Video file");
                break;
            case IMAGE_ONLY:
                alertDialog.setTitle("Select an Image file");
                break;
            case AUDIO_ONLY:
                alertDialog.setTitle("Select an Audio file");
                break;
            case ALL_FILES:
                alertDialog.setTitle("Select a file");
                break;
            default:
                alertDialog.setTitle("Select a file");
        }
        filesListerView.start();
        alertDialog.show();
        alertDialog.getButton(BUTTON_NEUTRAL).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                filesListerView.goToDefaultDir();
            }
        });
    }

    /**
     * Listener to know which file/directory is selected
     *
     * @param onFileSelectedListener Instance of the Listener
     */
    public void setOnFileSelectedListener(OnFileSelectedListener onFileSelectedListener) {
        this.onFileSelectedListener = onFileSelectedListener;
    }

    /**
     * Set the initial directory to show the list of files in that directory
     *
     * @param file File pointing to the directory
     */
    public void setDefaultDir(@NonNull File file) {
        filesListerView.setDefaultDir(file);
    }

    /**
     * Set the initial directory to show the list of files in that directory
     *
     * @param file String denoting to the directory
     */
    public void setDefaultDir(@NonNull String file) {
        filesListerView.setDefaultDir(file);
    }

    /**
     * Set the file filter for listing the files
     *
     * @param fileFilter One of the FILE_FILTER values
     */
    public void setFileFilter(FILE_FILTER fileFilter) {
        filesListerView.setFileFilter(fileFilter);
    }

}