NewPipe/app/src/main/java/org/schabi/newpipe/MainActivity.java

package org.schabi.newpipe;

import android.content.Intent;
import android.media.AudioManager;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.NavUtils;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import org.schabi.newpipe.download.DownloadActivity;
import org.schabi.newpipe.settings.SettingsActivity;
import org.schabi.newpipe.util.PermissionHelper;
import org.schabi.newpipe.util.ThemeHelper;

/**
 * Created by Christian Schabesberger on 02.08.16.
 *
 * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
 * DownloadActivity.java is part of NewPipe.
 *
 * NewPipe is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * NewPipe is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
 */


public class MainActivity extends AppCompatActivity {
    private Fragment mainFragment = null;
    private static final String TAG = MainActivity.class.toString();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ThemeHelper.setTheme(this, true);
        setContentView(R.layout.activity_main);
        setVolumeControlStream(AudioManager.STREAM_MUSIC);
        mainFragment = getSupportFragmentManager()
                .findFragmentById(R.id.search_fragment);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        switch (id) {
            case android.R.id.home: {
                Intent intent = new Intent(this, MainActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                NavUtils.navigateUpTo(this, intent);
                return true;
            }
            case R.id.action_settings: {
                Intent intent = new Intent(this, SettingsActivity.class);
                startActivity(intent);
                return true;
            }
            case R.id.action_show_downloads: {
                if (!PermissionHelper.checkStoragePermissions(this)) {
                    return false;
                }
                Intent intent = new Intent(this, DownloadActivity.class);
                startActivity(intent);
                return true;
            }
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}