com.luskprog.doubledpager.MainActivity.java Source code

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Here is the source code for com.luskprog.doubledpager.MainActivity.java

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.luskprog.doubledpager;

import java.util.ArrayList;
import java.util.List;

import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.Menu;
import android.view.View;

/**
 * The main Activity which will have only a layout with two ViewPagers.
 * 
 * @author Luksprog
 *
 */
public class MainActivity extends FragmentActivity {

    private boolean mIsLandscape = false;
    private ViewPager mPortraitPager, mLandscapePager;
    private List<String> mBookPages = new ArrayList<String>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // see the orientation of the screen
        mIsLandscape = getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE ? true
                : false;
        mPortraitPager = (ViewPager) findViewById(R.id.portraitPager);
        mLandscapePager = (ViewPager) findViewById(R.id.landscapePager);
        CustomAdapter adapter = new CustomAdapter(getSupportFragmentManager());
        // setup the right ViewPager based on the orientation and kill the
        // other.
        if (mIsLandscape) {
            mPortraitPager.setVisibility(View.GONE);
            mLandscapePager.setAdapter(adapter);
            mPortraitPager.setAdapter(null);
        } else {
            mLandscapePager.setVisibility(View.GONE);
            mPortraitPager.setAdapter(adapter);
            mLandscapePager.setAdapter(null);
        }
        // simulate the data
        for (int i = 0; i < 30; i++) {
            mBookPages.add("Book Page no." + i);
        }
    }

    public boolean isLandscape() {
        return mIsLandscape;
    }

    /**
     * Our custom adapter class that will be used.
     * 
     * @author Luksprog
     * 
     */
    private class CustomAdapter extends FragmentStatePagerAdapter {

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

        @Override
        public Fragment getItem(int position) {
            Bundle args = new Bundle();
            // get the fragment but also pass the position to them
            if (mIsLandscape) {
                DoublePageFragment doublePageFragment = new DoublePageFragment();
                args.putInt("position", position);
                doublePageFragment.setArguments(args);
                return doublePageFragment;
            } else {
                PageFragment pageFragment = new PageFragment();
                args.putInt("position", position);
                pageFragment.setArguments(args);
                return pageFragment;

            }
        }

        @Override
        public int getCount() {
            int count = mBookPages.size();
            if (mIsLandscape) {
                int tmp = count;
                count = tmp / 2;
                // add one if we have an odd number of pages(for the double page
                // situation)
                if (tmp % 2 != 0) {
                    count++;
                }
            }
            return count;

        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    /**
     * Method simulating the retrieving of data for our single page fragment.
     * 
     * @param position
     *            the position for which we need data(this is a simple value so
     *            we can use it directly)
     * @return the data
     */
    public CharSequence getSinglePage(int position) {
        return mBookPages.get(position);
    }

    /**
     * Method simulating the retrieving of data for our double page fragment.
     * 
     * @param position
     *            the position for which we need data(for double page we need to
     *            calculate the right position)
     * @return the data
     */
    public String[] getDoublePage(int position) {
        // careful as we could have an odd number of pages
        String[] data = new String[2];
        data[0] = mBookPages.get(position * 2);
        data[1] = mBookPages.get(position * 2 + 1);
        return data;
    }

}