uk.ac.hutton.ics.buntata.activity.AboutActivity.java Source code

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Here is the source code for uk.ac.hutton.ics.buntata.activity.AboutActivity.java

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/*
 * Copyright 2016 Information & Computational Sciences, The James Hutton Institute
 *
 * 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.
 */

package uk.ac.hutton.ics.buntata.activity;

import android.content.*;
import android.graphics.*;
import android.os.*;
import android.support.design.widget.*;
import android.support.v4.app.*;
import android.support.v4.view.*;
import android.support.v7.widget.Toolbar;
import android.view.*;
import android.widget.*;

import butterknife.*;
import uk.ac.hutton.ics.buntata.R;
import uk.ac.hutton.ics.buntata.fragment.*;

/**
 * The {@link AboutActivity} shows the about {@link Fragment}s: {@link AboutInformationFragment}, {@link AboutDeveloperFragment} and {@link
 * AboutLicenseFragment}.
 *
 * @author Sebastian Raubach
 */
public class AboutActivity extends BaseActivity {
    @BindView(R.id.about_viewpager)
    ViewPager viewPager;
    @BindView(R.id.about_image)
    ImageView aboutImage;
    @BindView(R.id.about_tabs)
    TabLayout tabLayout;
    @BindView(R.id.about_collapsingtoolbarlayout)
    CollapsingToolbarLayout collapsingToolbarLayout;
    @BindView(R.id.about_appbarlayout)
    AppBarLayout appBarLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        ButterKnife.bind(this);

        final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        /* Set the toolbar as the action bar */
        if (getSupportActionBar() != null) {
            /* Set the title */
            getSupportActionBar().setTitle(" ");
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
            getSupportActionBar().setHomeButtonEnabled(true);
        }

        getWindow().getDecorView()
                .setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
            getWindow().setStatusBarColor(Color.TRANSPARENT);

        /* Get the view pager and set the fragment adapter */
        viewPager.setAdapter(new AboutFragmentPagerAdapter(getSupportFragmentManager(), this));
        tabLayout.setupWithViewPager(viewPager);

        final float heightDp = getResources().getDisplayMetrics().heightPixels / 2f;
        final CollapsingToolbarLayout.LayoutParams lp = (CollapsingToolbarLayout.LayoutParams) aboutImage
                .getLayoutParams();

        aboutImage.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                aboutImage.getViewTreeObserver().removeOnGlobalLayoutListener(this);

                if (aboutImage.getHeight() > heightDp)
                    lp.height = (int) heightDp;
            }
        });

        /* Get the CollapsingToolbarLayout and listen for offset change events to show/hide the toolbar title, i.e. it'll only be shown when the toolbar is fully collapsed */
        appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
            boolean show = false;
            int scrollRange = -1;

            @Override
            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
                if (scrollRange == -1) {
                    scrollRange = appBarLayout.getTotalScrollRange();
                }
                if (scrollRange + verticalOffset == 0) {
                    collapsingToolbarLayout.setTitle(getString(R.string.title_activity_about));
                    show = true;
                } else if (show) {
                    collapsingToolbarLayout.setTitle(" "); // careful there should a space between double quote otherwise it won't work
                    show = false;
                }
            }
        });
    }

    @Override
    protected Integer getLayoutId() {
        return R.layout.activity_about;
    }

    @Override
    protected Integer getToolbarId() {
        return null;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            onBackPressed();
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

    /**
     * The {@link AboutFragmentPagerAdapter} takes care of the actual {@link Fragment}s in the {@link ViewPager}.
     */
    public class AboutFragmentPagerAdapter extends FragmentPagerAdapter {
        private String[] titles;

        AboutFragmentPagerAdapter(FragmentManager fm, Context context) {
            super(fm);

            this.titles = new String[] { context.getString(R.string.about_tab_information),
                    context.getString(R.string.about_tab_acknowledgements),
                    context.getString(R.string.about_tab_team), context.getString(R.string.about_tab_license) };
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return titles[position];
        }

        @Override
        public int getCount() {
            return 4;
        }

        @Override
        public Fragment getItem(int position) {
            switch (position) {
            case 0:
                return new AboutInformationFragment();
            case 1:
                return new AboutAcknowledgementsFragment();
            case 2:
                return new AboutDeveloperFragment();
            case 3:
                return new AboutLicenseFragment();
            }

            return null;
        }
    }
}