PicsActivity.java

package org.aisen.weibo.sina.ui.activity.picture;

import org.aisen.weibo.sina.R;
import org.aisen.weibo.sina.support.utils.BaiduAnalyzeUtils;
import org.aisen.weibo.sina.ui.fragment.picture.PictureFragment;
import org.sina.android.bean.PicUrls;
import org.sina.android.bean.StatusContent;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.ViewGroup;

import com.m.common.utils.KeyGenerator;
import com.m.support.Inject.ViewInject;
import com.m.support.adapter.FragmentPagerAdapter;
import com.m.ui.activity.BaseActivity;

public class PicsActivity extends BaseActivity implements OnPageChangeListener {

	public static void launch(Activity from, StatusContent bean, int index) {
		Intent intent  = new Intent(from, PicsActivity.class);
		intent.putExtra("bean", bean);
		intent.putExtra("index", index);
		from.startActivity(intent);
	}
	
	@ViewInject(id = R.id.viewPager)
	ViewPager viewPager;
	
	private StatusContent mBean;
	private int index;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.ui_pics);
		
		getActionBar().setTitle(R.string.title_pic);
		getActionBar().setDisplayShowHomeEnabled(false);
		getActionBar().setDisplayHomeAsUpEnabled(true);
		
		mBean = savedInstanceState == null ? (StatusContent) getIntent().getSerializableExtra("bean") 
										   : (StatusContent) savedInstanceState.getSerializable("bean");
		index = savedInstanceState == null ? getIntent().getIntExtra("index", 0)
										: savedInstanceState.getInt("index", 0);
		
		viewPager.setAdapter(new MyViewPagerAdapter(getFragmentManager()));
		viewPager.setOnPageChangeListener(this);
		viewPager.setCurrentItem(index);
		if (size() > 1)
			getActionBar().setSubtitle(String.format("%d/%d", index + 1, size()));
	}
	
	@Override
	protected int configTheme() {
		return R.style.PictureTheme;
	}
	
	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		
		outState.putInt("index", index);
		outState.putSerializable("bean", mBean);
	}
	
	private int size() {
		if (mBean.getRetweeted_status() != null) {
			return mBean.getPic_urls().length;
		}
		
		return mBean.getPic_urls().length;
	}
	
	private PicUrls getPicture(int index) {
		if (mBean.getRetweeted_status() != null) {
			return mBean.getPic_urls()[index];
		}
		
		return mBean.getPic_urls()[index];
	}
	
	protected Fragment newFragment(int position) {
		return PictureFragment.newInstance(getPicture(position));
	}
	
	class MyViewPagerAdapter extends FragmentPagerAdapter {

		public MyViewPagerAdapter(FragmentManager fm) {
			super(fm);
		}

		@Override
		public Fragment getItem(int position) {
			Fragment fragment = getFragmentManager().findFragmentByTag(makeFragmentName(position));
			if (fragment == null) {
				fragment = newFragment(position);
			}
			
			return fragment;
		}

		@Override
		public int getCount() {
			return size();
		}
		
		@Override
		public void destroyItem(ViewGroup container, int position, Object object) {
			super.destroyItem(container, position, object);
			
			Fragment fragment = getFragmentManager().findFragmentByTag(makeFragmentName(position));
			if (fragment != null)
				mCurTransaction.remove(fragment);
		}

		@Override
		protected String makeFragmentName(int position) {
			return KeyGenerator.generateMD5(getPicture(position).getThumbnail_pic());
		}

	}

	@Override
	public void onPageScrollStateChanged(int arg0) {
		
	}

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

	@Override
	public void onPageSelected(int index) {
		this.index = index;
		
		getActionBar().setSubtitle(String.format("%d/%d", index + 1, size()));
	}
	
	@Override
	protected void onResume() {
		super.onResume();
		
		BaiduAnalyzeUtils.onPageStart("查看图片");
	}
	
	@Override
	protected void onPause() {
		super.onPause();
		
		BaiduAnalyzeUtils.onPageEnd("查看图片");
	}
	
}