com.roger.quickviewpage.ImageDetailActivity.java Source code

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Here is the source code for com.roger.quickviewpage.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.roger.quickviewpage;

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.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.roger.quickviewpage.imagecache.ImageCache.ImageCacheParams;
import com.roger.quickviewpage.imagecache.ImageWorker;
import com.roger.quickviewpage.imagecache.Images;

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

    private ImagePagerAdapter mAdapter;
    private ImageWorker mImageWorker;
    private ViewPager mPager;

    /**  **/
    private ViewGroup dotGroup;
    /**  **/
    private ImageView[] tips;

    @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;// ??

        ImageCacheParams cacheParams = new ImageCacheParams();
        cacheParams.reqHeight = height;// 
        cacheParams.reqWidth = width;// 
        cacheParams.memoryCacheEnabled = false;
        //      cacheParams.loadingResId = R.drawable.ic_launcher;// 
        mImageWorker = ImageWorker.newInstance(this);
        mImageWorker.addParams(TAG, cacheParams);
        // mImageWorker.setLoadingImage(R.drawable.empty_photo);

        // Set up ViewPager and backing adapter
        mAdapter = new ImagePagerAdapter(getSupportFragmentManager(), Images.imageUrls.length);
        mPager = (ViewPager) findViewById(R.id.pager);
        mPager.setAdapter(mAdapter);
        dotGroup = (ViewGroup) findViewById(R.id.dot_group);
        setDot(Images.imageUrls.length);
        // 
        mPager.setOnPageChangeListener(new OnPageChangeListener() {
            @Override
            public void onPageScrollStateChanged(int arg0) {
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageSelected(int position) {
                Log.i("Icache", "onPageSelected = " + position);
                for (int i = 0; i < tips.length; i++) {
                    if (i == position % tips.length) {
                        tips[i].setBackgroundResource(R.drawable.news_diang);
                    } else {
                        tips[i].setBackgroundResource(R.drawable.news_diang_hover);
                    }
                }
            }
        });
        // 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();
        mImageWorker.setOnScreen(TAG, true);
        mAdapter.notifyDataSetChanged();
    }

    @Override
    public void onPause() {
        super.onPause();
        mImageWorker.setOnScreen(TAG, false);
    }

    /**
     * Called by the ViewPager child fragments to load images via the one
     * ImageWorker
     * 
     * @return
     */
    public ImageWorker getImageWorker() {
        return mImageWorker;
    }

    /**
     * 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(position);
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            final ImageDetailFragment fragment = (ImageDetailFragment) object;
            // As the item gets destroyed we try and cancel any existing work.
            fragment.cancelWork();
            super.destroyItem(container, position, object);
        }
    }

    // 
    public void setDot(int index) {
        dotGroup.removeAllViews();
        tips = new ImageView[index];
        for (int i = 0; i < tips.length; i++) {
            ImageView imageView = new ImageView(ImageDetailActivity.this);
            imageView.setLayoutParams(new LayoutParams(5, 5));
            tips[i] = imageView;
            if (i == 0) {
                tips[i].setBackgroundResource(R.drawable.news_diang);
            } else {
                tips[i].setBackgroundResource(R.drawable.news_diang_hover);
            }

            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                    new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
            layoutParams.leftMargin = 5;
            layoutParams.rightMargin = 5;
            dotGroup.addView(imageView, layoutParams);
        }
    }

}