ImageViewActivity.java

package com.ant.jobgod.imagetool.photoview;

import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.PagerAdapter;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.ant.jobgod.imagetool.R;
import com.facebook.common.references.CloseableReference;
import com.facebook.datasource.DataSource;
import com.facebook.datasource.DataSubscriber;
import com.facebook.drawee.backends.pipeline.Fresco;
import com.facebook.imagepipeline.common.ResizeOptions;
import com.facebook.imagepipeline.core.ImagePipeline;
import com.facebook.imagepipeline.datasource.BaseBitmapDataSubscriber;
import com.facebook.imagepipeline.image.CloseableImage;
import com.facebook.imagepipeline.request.ImageRequest;
import com.facebook.imagepipeline.request.ImageRequestBuilder;

import java.util.ArrayList;
import java.util.concurrent.Executor;

/**
* Created by Mr.Jude on 2015/2/22.
*/
public class ImageViewActivity extends ActionBarActivity implements View.OnClickListener{
    public static String KEY_URIS = "uris";
    public static String KEY_INDEX = "index";

    private HackyViewPager mViewPager;
    private TextView mTv_lock;
    private ImageView mTv_return;
    private TextView mTv_title;
    private ImagePagerAdapter mAdapter;

    Handler handler = new Handler();
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_imageview);
        mTv_lock = (TextView) findViewById(R.id.lock);
        mTv_return = (ImageView) findViewById(R.id.home);
        mTv_title = (TextView) findViewById(R.id.title);
        mTv_title.setOnClickListener(this);
        mTv_lock.setOnClickListener(this);
        mTv_return.setOnClickListener(this);

        mViewPager = (HackyViewPager) findViewById(R.id.viewpager);
        mAdapter = new ImagePagerAdapter();
        mViewPager.setAdapter(mAdapter);
        ArrayList<Uri> urls = getIntent().getParcelableArrayListExtra(KEY_URIS);
        int index = getIntent().getIntExtra(KEY_INDEX,0);
        if (urls==null||urls.size()<=1){
            mTv_lock.setVisibility(View.GONE);
            mViewPager.toggleLock();
        }
        mAdapter.setUrls(urls);
        mViewPager.setCurrentItem(index);
    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.title||v.getId() == R.id.home){
            finish();
        }else if (v.getId() == R.id.lock){
            mViewPager.toggleLock();
            mTv_lock.setText((mViewPager.isLocked()) ? "解锁":"锁定");
        }
    }

    class ImagePagerAdapter extends PagerAdapter {
        private ArrayList<Uri> urls;

        public void setUrls(ArrayList<Uri> urls){
            this.urls = urls;
            notifyDataSetChanged();
        }

        @Override
        public int getCount() {
            return urls==null?0:urls.size();
        }

        @Override
        public View instantiateItem(ViewGroup container, int position) {
            View view = LayoutInflater.from(ImageViewActivity.this).inflate(R.layout.item_imagepage, container, false);
            final PhotoView photoView = (PhotoView) view.findViewById(R.id.photoview);
            final View wheel = view.findViewById(R.id.wheel);

            ImagePipeline imagePipeline = Fresco.getImagePipeline();
            ImageRequest request = ImageRequestBuilder.newBuilderWithSource(urls.get(position))
                    .setResizeOptions(new ResizeOptions(768, 768))
                    .build();
            DataSource<CloseableReference<CloseableImage>>
                    dataSource = imagePipeline.fetchDecodedImage(request,this);
            DataSubscriber dataSubscriber = new BaseBitmapDataSubscriber() {
                @Override
                protected void onNewResultImpl(Bitmap bitmap) {
                      photoView.setImageBitmap(bitmap);
                      wheel.setVisibility(View.GONE);
                }

                @Override
                protected void onFailureImpl(DataSource<CloseableReference<CloseableImage>> closeableReferenceDataSource) {

                }
            };
            dataSource.subscribe(dataSubscriber, new Executor() {
                @Override
                public void execute(Runnable command) {
                    handler.post(command);
                }
            });
            container.addView(view);
            return view;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((View) object);
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

    }

}