Android Open Source - Resonos-Android-Framework Custom View Pager

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License

The source code is released under:

Apache License

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Java Source Code

package com.resonos.apps.library.tabviewpager;
/* w  w w  . j a  v a 2s. c  o  m*/
import android.content.Context;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;

public class CustomViewPager extends ViewPager {
  
  // constants
  private static final String STATE_SUPER = "cvpSuper", STATE_POS = "cvpRealPos";

  /**
   * Create a custom viewpager for use with {@link TabViewPagerFragment}
   *  and {@link TabViewPagerAdapter}
   * @param context
   */
  public CustomViewPager(Context context) {
    super(context);
  }

  /**
   * Create a custom viewpager for use with {@link TabViewPagerFragment}
   *  and {@link TabViewPagerAdapter}
   * @param context
   * @param attrs
   */
  public CustomViewPager(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  @Override
  public Parcelable onSaveInstanceState() {
    Parcelable superState = super.onSaveInstanceState();
    Bundle b = new Bundle();
    b.putParcelable(STATE_SUPER, superState);
    if (getAdapter() != null) {
      int item = this.getCurrentItem();
      try {
        b.putInt(STATE_POS, getVPAdapter().getRealPage(item));
      } catch (ArrayIndexOutOfBoundsException ex) {
        // occurs very rarely when something triggers a future backstack pop while the activity is hidden
        // this is because the adapter has not gotten a chance to construct its mapping yet
        // it is not necessary to save this information in this case
        // ignore the error and move on
      }
    }
    return b;
  }

  @Override
  public void onRestoreInstanceState(Parcelable state) {
    if (!(state instanceof Bundle)) {
      super.onRestoreInstanceState(state);
      return;
    }
    
    if (state != null) {
      Bundle b = (Bundle)state;
      super.onRestoreInstanceState(b.getParcelable(STATE_SUPER));
      if (getAdapter() != null) {
        int item = ((TabViewPagerAdapter)getAdapter()).getFunctionalPage(b.getInt(STATE_POS));
        if (item >= 0)
          this.setCurrentItem(item);
      }
    }
  }
  
  /**
   * Shortcut to get the adapter cast as a {@link TabViewPagerAdapter}
   * @return the viewpager's adapter
   */
  public TabViewPagerAdapter getVPAdapter() {
    return (TabViewPagerAdapter)super.getAdapter();
  }
}

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