com.commonsware.android.recyclerview.videolist.MainActivity.java Source code

Introduction

Here is the source code for com.commonsware.android.recyclerview.videolist.MainActivity.java

Source

/***
  Copyright (c) 2008-2016 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain   a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS,   WITHOUT   WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.
      
  Covered in detail in the book _The Busy Coder's Guide to Android Development_
https://commonsware.com/Android
*/

package com.commonsware.android.recyclerview.videolist;

import android.Manifest;
import android.app.LoaderManager;
import android.content.CursorLoader;
import android.content.Loader;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.ViewGroup;

public class MainActivity extends RecyclerViewActivity implements LoaderManager.LoaderCallbacks<Cursor> {
    private static final String STATE_IN_PERMISSION = "inPermission";
    private static final int REQUEST_PERMS = 137;
    private boolean isInPermission = false;

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        setLayoutManager(new LinearLayoutManager(this));
        setAdapter(new VideoAdapter());

        if (icicle != null) {
            isInPermission = icicle.getBoolean(STATE_IN_PERMISSION, false);
        }

        if (hasFilesPermission()) {
            loadVideos();
        } else if (!isInPermission) {
            isInPermission = true;

            ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.READ_EXTERNAL_STORAGE },
                    REQUEST_PERMS);
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        outState.putBoolean(STATE_IN_PERMISSION, isInPermission);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        isInPermission = false;

        if (requestCode == REQUEST_PERMS) {
            if (hasFilesPermission()) {
                loadVideos();
            } else {
                finish(); // denied permission, so we're done
            }
        }
    }

    @Override
    public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {
        return (new CursorLoader(this, MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null, null,
                MediaStore.Video.Media.TITLE));
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor c) {
        ((VideoAdapter) getAdapter()).setVideos(c);
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        ((VideoAdapter) getAdapter()).setVideos(null);
    }

    private boolean hasFilesPermission() {
        return (ContextCompat.checkSelfPermission(this,
                Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED);
    }

    private void loadVideos() {
        getLoaderManager().initLoader(0, null, this);
    }

    class VideoAdapter extends RecyclerView.Adapter<RowController> {
        Cursor videos = null;

        @Override
        public RowController onCreateViewHolder(ViewGroup parent, int viewType) {
            return (new RowController(getLayoutInflater().inflate(R.layout.row, parent, false)));
        }

        void setVideos(Cursor videos) {
            this.videos = videos;
            notifyDataSetChanged();
        }

        @Override
        public void onBindViewHolder(RowController holder, int position) {
            videos.moveToPosition(position);
            holder.bindModel(videos);
        }

        @Override
        public int getItemCount() {
            if (videos == null) {
                return (0);
            }

            return (videos.getCount());
        }
    }
}