com.digitallifelab.environmentmonitor.ImageDetailActivity.java Source code

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Here is the source code for com.digitallifelab.environmentmonitor.ImageDetailActivity.java

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/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.digitallifelab.environmentmonitor;

import android.annotation.TargetApi;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.util.DisplayMetrics;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;

import com.digitallifelab.environmentmonitor.Utils.Utility;

import java.util.ArrayList;

public class ImageDetailActivity extends AppCompatActivity implements View.OnClickListener {
    public static final String EXTRA_IMAGE = "extra_image";
    public static final String IMAGES_ARRAY = "Viewer_ImagesArray";

    private ImagePagerAdapter mAdapter;
    private ViewPager mPager;
    private ArrayList<String> imagesList;

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.image_detail_pager);

        // Fetch screen height and width, to use as our max size when loading images as this
        // activity runs full screen
        final DisplayMetrics displayMetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
        final int height = displayMetrics.heightPixels;
        final int width = displayMetrics.widthPixels;

        Intent data = getIntent();
        if (data.hasExtra(IMAGES_ARRAY)) {
            imagesList = data.getStringArrayListExtra(IMAGES_ARRAY);
        } else {
            imagesList = new ArrayList<String>();
        }

        // Set up ViewPager and backing adapter
        mAdapter = new ImagePagerAdapter(getSupportFragmentManager(), imagesList.size());
        mPager = (ViewPager) findViewById(R.id.pager);
        mPager.setAdapter(mAdapter);
        mPager.setPageMargin((int) getResources().getDimension(R.dimen.activity_horizontal_margin));
        mPager.setOffscreenPageLimit(2);

        // Set up activity to go full screen
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

        // Enable some additional newer visibility and ActionBar features to create a more
        // immersive photo viewing experience
        if (Utility.hasHoneycomb()) {
            //setSupportActionBar(null);
            final ActionBar actionBar = getSupportActionBar();

            // Hide title text and set home as up
            actionBar.setDisplayShowTitleEnabled(false);
            actionBar.setDisplayHomeAsUpEnabled(true);

            // Hide and show the ActionBar as the visibility changes
            mPager.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
                @Override
                public void onSystemUiVisibilityChange(int vis) {
                    if ((vis & View.SYSTEM_UI_FLAG_LOW_PROFILE) != 0) {
                        actionBar.hide();
                    } else {
                        actionBar.show();
                    }
                }
            });

            // Start low profile mode and hide ActionBar
            mPager.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
            actionBar.hide();
        }

        // Set the current item based on the extra passed in to this activity
        final int extraCurrentItem = getIntent().getIntExtra(EXTRA_IMAGE, -1);
        if (extraCurrentItem != -1) {
            mPager.setCurrentItem(extraCurrentItem);
        }
    }

    /**
     * The main adapter that backs the ViewPager. A subclass of FragmentStatePagerAdapter as there
     * could be a large number of items in the ViewPager and we don't want to retain them all in
     * memory at once but create/destroy them on the fly.
     */
    private class ImagePagerAdapter extends FragmentStatePagerAdapter {
        private final int mSize;

        public ImagePagerAdapter(FragmentManager fm, int size) {
            super(fm);
            mSize = size;
        }

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

        @Override
        public Fragment getItem(int position) {
            //Get next image URL
            return ImageDetailFragment.newInstance(imagesList.get(position));
        }
    }

    /**
     * Set on the ImageView in the ViewPager children fragments, to enable/disable low profile mode
     * when the ImageView is touched.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @Override
    public void onClick(View v) {
        final int vis = mPager.getSystemUiVisibility();
        if ((vis & View.SYSTEM_UI_FLAG_LOW_PROFILE) != 0) {
            mPager.setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
        } else {
            mPager.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
        }
    }
}