Android Open Source - ViewPager View Pager Activity

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License

The source code is released under:

Apache License

Java Source Code

package com.jiahaoliuliu.viewpager;
/* ww w .  j  a v  a  2  s. c om*/
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;

import android.graphics.Color;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ViewPagerActivity extends FragmentActivity {

  private static final String LOG_TAG = ViewPagerActivity.class.getSimpleName();

  /**
   * The number of pages (wizard steps) to show in this demo.
   */
  private static final int NUM_PAGES = 3;

  /**
   * The pager widget, which handles animation and allows swiping horizontally to access previous
   * and next wizard steps.
   */
  private ViewPager mPager;

  TimerTask task;

  ImageView indicator;

  /**
   * The pager adapter, which provides the pages to the view pager widget.
   */
  private PagerAdapter mPagerAdapter;


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.view_pager_layout);

    indicator = (ImageView) findViewById(R.id.indicator);

    // Instantiate a ViewPager and a PagerAdapter.
    mPager = (ViewPager) findViewById(R.id.pager);
    ArrayList<String> list = new ArrayList<String>();
    
    list.add("primera posicion");
    for (int i = 0; i < NUM_PAGES;++i) {
      list.add("Hola, soy la posicion "+i);
    }
    list.add("ultima posicion");
    
    mPagerAdapter = new CircularPagerAdapter(list);
    mPager.setAdapter(mPagerAdapter);
    mPager.setOffscreenPageLimit(3);
    mPager.setCurrentItem(1,false);

    try {
      Field mScroller;
      mScroller = ViewPager.class.getDeclaredField("mScroller");
      mScroller.setAccessible(true); 
      FixedSpeedScroller scroller = new FixedSpeedScroller(mPager.getContext());
      scroller.setFixedDuration(1000);
      mScroller.set(mPager, scroller);
    } catch (Exception e) {
    } 


    mPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

      @Override
      public void onPageSelected(int position) {
        if (position == 0) {
          position = NUM_PAGES;
        } else if (position == NUM_PAGES+1){
          position = 1;
        }
        int indexDrawable = position-1;
        int id = getResources().getIdentifier("paginador0"+indexDrawable, "drawable", getPackageName());
        indicator.setImageDrawable(getResources().getDrawable(id));
      }

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

      @Override
      public void onPageScrollStateChanged(int state) { 

        if (state == ViewPager.SCROLL_STATE_IDLE) {
          int position = mPager.getCurrentItem();
          if (position == 0) {
            position = NUM_PAGES;
            mPager.setCurrentItem(position,false);
          } else if (position == NUM_PAGES+1) {
            position = 1;
            mPager.setCurrentItem(position,false);
          }
        }
      }
    });

    /*
    // Creates the timer to automatically scroll the view pager.
    task = new TimerTask() {
      public void run() {
        runOnUiThread(new Runnable() {

          @Override
          public void run() {
            boolean animation = true;
            int position = mPager.getCurrentItem()+1;
            mPager.setCurrentItem(position,animation);
          }
        });
      }
    };
    Timer timer = new Timer();
    timer.schedule(task, 3000, 3000);

    // Cancel the timer if the user has clicked on the viewPager
    mPager.setOnTouchListener(new OnTouchListener() {

      @Override
      public boolean onTouch(View v, MotionEvent event) {
        task.cancel();
        return false;
      }
    });
    */
  }

  private class CircularPagerAdapter extends PagerAdapter {

    private ArrayList<String> data;
    private int currentPos;

    public CircularPagerAdapter(ArrayList<String> list) {
      super();
      data = list;
      currentPos = -1;
    }

    public int getCount() {
      return data.size();
    }

    public Object instantiateItem(ViewGroup container, int position) {
        LinearLayout root = new LinearLayout(ViewPagerActivity.this);
        TextView text = new TextView(ViewPagerActivity.this);
        text.setGravity(Gravity.CENTER);
        int index = position;
        if (position == 0){
          index = NUM_PAGES;
        } else if (position == NUM_PAGES+1){
          index = 1;
        }
        currentPos = index;
        text.setText(data.get(index));
        text.setTextColor(Color.WHITE);
        root.addView(text);
        ((ViewPager) container).addView(root, 0);
        return root; 
    }

    @Override
    public void destroyItem(View container, int position, Object object) { ((ViewPager) container).removeView((View) object); }
    
    @Override
    public void finishUpdate(View container) { }
    @Override
    public boolean isViewFromObject(View view, Object object) { return view == ((View) object); }
    @Override
    public void restoreState(Parcelable state, ClassLoader loader) { }
    @Override
    public Parcelable saveState() {  return null; }
    @Override
    public void startUpdate(View container) { }
  }

}

Java Source Code List

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