android 简单的浏览图片

/**
 * 浏览图片
 */
public class ImagePagerActivity extends BaseActivity {

    @BindView(R.id.pager)
    ImageViewPager mPager;
    @BindView(R.id.indicator)
    TextView indicator;
    private int pagerPosition;
    private static final String STATE_POSITION = "STATE_POSITION";
    public static final String EXTRA_IMAGE_INDEX = "image_index";
    public static final String EXTRA_IMAGE_URLS = "image_urls";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // TODO: add setContentView(...) invocation
        ButterKnife.bind(this);
        initView();
        if (savedInstanceState != null) {
            pagerPosition = savedInstanceState.getInt(STATE_POSITION);
        }
    }

    private void initView() {
        pagerPosition = getIntent().getIntExtra(EXTRA_IMAGE_INDEX, 0);
        ArrayList urls = getIntent().getStringArrayListExtra(EXTRA_IMAGE_URLS);
        MyImageAdapter mAdapter = new MyImageAdapter(urls);
        mPager.setAdapter(mAdapter);
        CharSequence text = getString(R.string.viewpager_indicator, 1, mPager.getAdapter().getCount());
        indicator.setText(text);
        // 更新下标
        mPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrollStateChanged(int arg0) {
            }

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

            @Override
            public void onPageSelected(int arg0) {
                CharSequence text = getString(R.string.viewpager_indicator, arg0 + 1, mPager.getAdapter().getCount());
                indicator.setText(text);
            }

        });

        mPager.setCurrentItem(pagerPosition);
    }

    @Override
    public int setLayoutId() {
        return R.layout.image_pager_activity;
    }

    @Override
    public String setTitle() {
        return getString(R.string.string_brows_pictures);
    }

    @Override
    public void wingetListener() {

    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt(STATE_POSITION, mPager.getCurrentItem());
    }

    class MyImageAdapter extends PagerAdapter {
        private List imageUrls;

        public MyImageAdapter(List imageUrls) {
            this.imageUrls = imageUrls;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            String url = imageUrls.get(position);
            PhotoView photoView = new PhotoView(ImagePagerActivity.this);
            GlideUtil.loadAty(url, photoView);
            container.addView(photoView);
            photoView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    ImagePagerActivity.this.finish();
                }
            });
            return photoView;
        }

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

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

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

        @Override
        public int getItemPosition(Object object) {
            return POSITION_NONE;
        }

    }
}