Android Open Source - RecyclingImageLoader Image Detail Activity

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2013 hellosky ye// www  .j  a v  a2 s.c o m
 *
 * 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.hellosky.recyclingimageloader;

import android.annotation.TargetApi;
import android.app.ActionBar;
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.view.ViewPager;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager.LayoutParams;

import com.hellosky.recyclingimageloader.util.ImageLoader;
import com.hellosky.recyclingimageloader.util.Utils;

public class ImageDetailActivity extends FragmentActivity{
    private static final String IMAGE_CACHE_DIR = "images";
    public static final String EXTRA_IMAGE = "extra_image";

    private ImagePagerAdapter mAdapter;
    private ImageLoader mImageLoader;
    private ViewPager mPager;

    @TargetApi(11)
    @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;

        // For this sample we'll use half of the longest width to resize our images. As the
        // image scaling ensures the image is larger than this, we should be left with a
        // resolution that is appropriate for both portrait and landscape. For best image quality
        // we shouldn't divide by 2, but this will use more memory and require a larger memory
        // cache.
        final int longest = (height > width ? height : width) / 2;
        
        mImageLoader = new ImageLoader(this);
        mImageLoader.setImageSize(longest);

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

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

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

            // 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);
        }
    }

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

    @Override
    protected void onPause() {
        super.onPause();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(mImageLoader != null){
          mImageLoader.clearCache();
        }
    }

    /**
     * Called by the ViewPager child fragments to load images via the one ImageFetcher
     */
    public ImageLoader getImageLoader() {
        return mImageLoader;
    }

    /**
     * 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) {
            return ImageDetailFragment.newInstance(Images.imageUrls[position]);
        }
    }

}

Java Source Code List

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