ImageViewer.java

/*
 * Copyright (C) 2014 Michell Bak
 *
 * 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 com.miz.mizuu;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.SimpleOnPageChangeListener;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnSystemUiVisibilityChangeListener;

import com.miz.base.MizActivity;
import com.miz.functions.MizLib;
import com.miz.mizuu.fragments.ActorPhotoFragment;
import com.miz.utils.ViewUtils;
import com.squareup.otto.Bus;
import com.squareup.otto.Subscribe;

public class ImageViewer extends MizActivity {

    private ViewPager mViewPager;
    private boolean mPortraitPhotos;
    private String[] mPhotos;
    private Bus mBus;
    private Handler mHandler = new Handler();
    private Toolbar mToolbar;
    private Runnable mHideSystemUiRunnable = new Runnable() {
        @Override
        public void run() {
            hideSystemUi();
        }
    };

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

        if (MizLib.hasKitKat()) {
            setTheme(R.style.Mizuu_Theme_Translucent_FullScreen);
        } else {
            setTheme(R.style.Mizuu_Theme_Transparent_FullScreen);
        }

        ViewUtils.setupWindowFlagsForStatusbarOverlay(getWindow(), true);

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

        ViewUtils.setProperToolbarSize(this, mToolbar);

        getSupportActionBar().setBackgroundDrawable(getResources().getDrawable(R.drawable.transparent_actionbar));

        mBus = MizuuApplication.getBus();

        mPortraitPhotos = getIntent().getBooleanExtra("portraitPhotos", true);
        mPhotos = getIntent().getStringArrayExtra("photos");

        getSupportActionBar().setTitle((getIntent().getIntExtra("selectedIndex", 0) + 1) + " " + getString(R.string.of) + " " + mPhotos.length);

        mViewPager = (ViewPager) findViewById(R.id.awesomepager);
        mViewPager.setPageMargin(MizLib.convertDpToPixels(getApplicationContext(), 16));
        mViewPager.setAdapter(new ActorPhotosAdapter(getSupportFragmentManager()));
        mViewPager.setOnPageChangeListener(new SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int arg0) {
                getSupportActionBar().setTitle((arg0 + 1) + " " + getString(R.string.of) + " " + mPhotos.length);
            }

        });
        mViewPager.setCurrentItem(getIntent().getIntExtra("selectedIndex", 0));

        View decorView = getWindow().getDecorView();
        decorView.setOnSystemUiVisibilityChangeListener(new OnSystemUiVisibilityChangeListener() {
            @Override
            public void onSystemUiVisibilityChange(int visibility) {
                if (visibility == 0) {
                    // The UI is visible due to user interaction - let's hide it again after three seconds
                    mHandler.postDelayed(mHideSystemUiRunnable, 3000);
                }
            }
        });
    }

    @Override
    protected int getLayoutResource() {
        return R.layout.viewpager_with_toolbar_overlay;
    }

    @SuppressLint("InlinedApi")
    @Subscribe
    public void tappedImage(Object event) {
        boolean visible = getSupportActionBar().isShowing();

        if (visible) {
            hideSystemUi();
        } else {
            showSystemUi();
        }
    }

    @SuppressLint("InlinedApi")
    private void hideSystemUi() {
        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_FULLSCREEN
                | View.SYSTEM_UI_FLAG_IMMERSIVE);

        mHandler.removeCallbacks(mHideSystemUiRunnable);

        getSupportActionBar().hide();
    }

    private void showSystemUi() {
        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
        ViewUtils.setupWindowFlagsForStatusbarOverlay(getWindow(), true);

        getSupportActionBar().show();
    }

    @Override
    public void onResume() {
        super.onResume();

        mBus.register(this);
    }

    @Override
    public void onPause() {
        super.onPause();

        mBus.unregister(this);
    }

    private class ActorPhotosAdapter extends FragmentPagerAdapter {

        public ActorPhotosAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int index) {
            return ActorPhotoFragment.newInstance(mPhotos[index], mPortraitPhotos);
        }

        @Override
        public int getCount() {
            return mPhotos.length;
        }
    }

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

    @Override
    public void onStart() {
        super.onStart();
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }
}