PicsActivity.java

package com.shaweibo.biu.ui.picture;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v13.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import android.view.ViewGroup;

import com.shaweibo.biu.R;
import com.shaweibo.biu.Utils.SystemBarUtils;
import com.shaweibo.biu.model.MessageModel;
import com.shaweibo.biu.ui.common.BaseActivity;
import com.getbase.floatingactionbutton.FloatingActionsMenu;

import butterknife.ButterKnife;
import butterknife.InjectView;
import butterknife.OnClick;


public class PicsActivity extends BaseActivity implements OnPageChangeListener {

	public static void start(Activity from, MessageModel bean, int index) {
		Intent intent  = new Intent(from, PicsActivity.class);
		intent.putExtra("bean", bean);
		intent.putExtra("index", index);
		from.startActivity(intent);
	}
	
	@InjectView(R.id.viewPager_pics)
    ViewPager viewPager;
    @InjectView( R.id.toolbar)
	Toolbar toolbar;
	@InjectView( R.id.multiple_actions)
	FloatingActionsMenu mFloatingMenu;

	@OnClick( R.id.action_ori_photo)
	void viewOrigPic(){

		mFloatingMenu.collapse();
		int current=viewPager.getCurrentItem();
		PictureFragment picFgm= (PictureFragment) myViewPagerAdapter.getItem(current);
		if(picFgm!=null)
			picFgm.loadOrigImage();
	}

	@OnClick( R.id.action_save)
	void savePic(){

		mFloatingMenu.collapse();
		int current=viewPager.getCurrentItem();
		PictureFragment picFgm= (PictureFragment) myViewPagerAdapter.getItem(current);
		if(picFgm!=null)
			picFgm.savePic();
	}


	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		int id = item.getItemId();
		switch (id) {
			case android.R.id.home:
				onBackPressed();
		}
		return super.onOptionsItemSelected(item);
	}

	
	private MessageModel mBean;
	private int index;

    MyViewPagerAdapter myViewPagerAdapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
//        AisenUtils.setPicStatusBar(this);
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_pics);
		ButterKnife.inject(this);

		setSupportActionBar(toolbar);
//		initStatusBar();
        getSupportActionBar().setDisplayShowHomeEnabled(false);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
		mBean = savedInstanceState == null ? (MessageModel) getIntent().getParcelableExtra("bean")
										   : (MessageModel) savedInstanceState.getParcelable("bean");
		index = savedInstanceState == null ? getIntent().getIntExtra("index", 0)
										: savedInstanceState.getInt("index", 0);

        myViewPagerAdapter = new MyViewPagerAdapter(getFragmentManager());
		viewPager.setAdapter(myViewPagerAdapter);
		viewPager.addOnPageChangeListener(this);
		viewPager.setCurrentItem(index);
		if (size() > 1 && getSupportActionBar() != null)
            getSupportActionBar().setTitle(String.format("%d/%d", index + 1, size()));
		else if (getSupportActionBar() != null)
            getSupportActionBar().setTitle(String.format("%d/%d", 1, 1));

	}


	private void initStatusBar(){
		if (Build.VERSION.SDK_INT >= 19) {
			ViewGroup drawerRoot = (ViewGroup) findViewById(R.id.rl_root);
			drawerRoot.setPadding(drawerRoot.getPaddingLeft(),
					SystemBarUtils.getStatusBarHeight(this),
					drawerRoot.getPaddingRight(),
					drawerRoot.getBottom());
		}
		if (Build.VERSION.SDK_INT >= 19) {
			ViewGroup rootMain = (ViewGroup) findViewById(R.id.rl_root);
			rootMain.setPadding(rootMain.getPaddingLeft(),
					rootMain.getPaddingTop(),
					rootMain.getPaddingRight(),
					rootMain.getBottom() + SystemBarUtils.getNavigationBarHeight(this));
		}

	}

	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		
		outState.putInt("index", index);
		outState.putParcelable("bean", mBean);
	}
	
	private int size() {
		if (mBean.retweeted_status != null) {
			return mBean.retweeted_status.pic_urls.size();
		}
		
		return mBean.pic_urls.size();
	}
	
	private MessageModel.PictureUrl getPicture(int index) {
		if (mBean.retweeted_status  != null) {
			return mBean.retweeted_status .pic_urls.get(index);
		}
		
		return mBean.pic_urls.get(index);
	}

    public MessageModel.PictureUrl getCurrent() {
        return getPicture(viewPager.getCurrentItem());
    }
	
	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)
//				.remove(fragment);
		}

		private String  makeFragmentName(long id) {
			return "android:switcher:" + R.id.viewPager_pics+ ":" + id;
		}



	}

	@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;
		
        getSupportActionBar().setTitle(String.format("%d/%d", index + 1, size()));

        PictureFragment fragment = (PictureFragment) myViewPagerAdapter.getItem(index);
//        if (fragment != null)
//            fragment.onStripTabRequestData();
	}

//    @Override
//    protected int configTheme() {
//        return R.style.AppTheme_Pics;
//    }

}