gistfile1.txt

package com.roy.airteldemo;

import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.PersistableBundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.roy.http.HTTPResponseListener;
import com.roy.http.HttpGet;
import com.roy.utils.AsyncThreadPool;
import com.roy.utils.ImageLoader;
import com.roy.utils.Util;
import com.roy.vo.ImageVO;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

import butterknife.Bind;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity implements HTTPResponseListener {

    @Bind(R.id.pager)
    ViewPager mViewPager;

    @Bind(R.id.progress_bar)
    RelativeLayout mBar;
    @Bind(R.id.back_button)
    Button btnBack;
    @Bind(R.id.foward_button)
    Button btnForward;
    @Bind(R.id.text_number)
    TextView tvCount;

    private CustomPagerAdapter mCustomPagerAdapter;
    public Handler mUIHandler;
    private AsyncThreadPool mThreadPool;
    private ArrayList<ImageVO> mImageList = new ArrayList<ImageVO>();
    ImageLoader loader;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        mUIHandler = new Handler(Looper.getMainLooper());
        AsyncThreadPool.init(mUIHandler);
        mThreadPool = AsyncThreadPool.get();


        fetchImages(); //fetching images -used asynctask for background processing

// button for swiping left and right views
        
        btnBack.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mViewPager.getCurrentItem() >= 0) {
                    mViewPager.setCurrentItem(getItem(-1), true);
                }

            }

        });
        btnForward.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mViewPager.getCurrentItem() <= mImageList.size() - 1) {
                    mViewPager.setCurrentItem(getItem(+1), true);
                }


            }
        });


        mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            public void onPageScrollStateChanged(int state) {
            }

            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            }

            public void onPageSelected(int position) {
                int count = position + 1;
                tvCount.setText(count + " " + "of" + " " + mImageList.size());
            }
        });

    }

    class CustomPagerAdapter extends PagerAdapter {   //custom adpter for showing images

        Context mContext;
        LayoutInflater mLayoutInflater;

        public CustomPagerAdapter(Context context, ArrayList<ImageVO> mList) {
            mContext = context;
            mImageList = mList;
            loader = new ImageLoader(mContext);
            mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        @Override
        public int getCount() {
            return mImageList.size();
        }

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

        @Override
        public Object instantiateItem(ViewGroup container, final int position) {
            View itemView = mLayoutInflater.inflate(R.layout.pager_item, container, false);
            ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView);


            try {
                JSONObject obj = (mImageList.get(position).getMedia());
                String url = obj.getString("m");


                loader.DisplayImage(url, imageView);
            } catch (Exception e) {
                Log.e("log exception", "" + e.getMessage());
            }


            container.addView(itemView);

            return itemView;
        }

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

    private void fetchImages() {

        if (Util.haveNetworkConnection(this)) {
            mBar.setVisibility(View.VISIBLE);
            String url = "http://api.flickr.com/services/feeds/photos_public.gne?format=json";

            HttpGet getAllLogs = new HttpGet(this, url);

            getAllLogs.run(url);
        } else {
            Toast.makeText(this, "No network connectivity", Toast.LENGTH_SHORT)
                    .show();
        }
    }

    @Override
    public Boolean setGetStatus(JSONObject finalResult, String getUrl, int responseCode) {  //make an interface for updating ui on post execute
        mBar.setVisibility(View.GONE);
        if (finalResult != null) {

            try {
                if (finalResult.has("items")) {


                    JSONArray jsonArray = finalResult.getJSONArray("items");
                    for (int i = 0; i < jsonArray.length(); i++) {

                        JSONObject jsonObject = jsonArray.getJSONObject(i);
                        ImageVO appObj = new ImageVO(jsonObject);

                        mImageList.add(appObj);

                    }
                    if (mImageList != null && !mImageList.isEmpty()) {
                        mCustomPagerAdapter = new CustomPagerAdapter(this, mImageList);
                        mViewPager.setAdapter(mCustomPagerAdapter);
                        int count = mViewPager.getCurrentItem() + 1;
                        tvCount.setText(count + " " + "of" + " " + mImageList.size());

                        Log.e("logtag", "" + mImageList.size());
                    }
                }
            } catch (JSONException e) {


            }


        }

        return false;
    }


    private int getItem(int i) {
        return mViewPager.getCurrentItem() + i;
    }


}