Android Open Source - GridListViewAdapters Fixed List Items Rotation Support

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License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright 2014-present Biraj Patel/*from   w  ww. jav a 2  s  . co m*/
 * 
 * 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.birin.listgridadapter.demo5;

import android.content.res.Configuration;
import android.os.Bundle;

import com.birin.gridlistviewadapters.utils.PositionCalculator;
import com.birin.gridlistviewadaptersdemo.common.Constants;
import com.birin.listgridadapter.demo4.ChildAndCardClickHandlingFixedListItems;

public class FixedListItemsRotationSupport extends
    ChildAndCardClickHandlingFixedListItems {

  // //////////////////////////////////////////////////////////////////////////////
  // TO MAINTAIN CORRECT POSITION AFTER ORIENTATION CHANGE
  // //////////////////////////////////////////////////////////////////////////////

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

  private int currentOrientation = Configuration.ORIENTATION_UNDEFINED;

  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    int firstVisible = listView.getFirstVisiblePosition();
    outState.putInt(Constants.KEY_OLD_POSITION, firstVisible);
    outState.putInt(Constants.KEY_OLD_ORIENTATION, currentOrientation);
  }

  private void adjustScroll(Bundle savedInstanceState) {
    currentOrientation = getCurrentOrientation();
    if (null != savedInstanceState) {
      int oldPosition = savedInstanceState.getInt(
          Constants.KEY_OLD_POSITION, 0);
      int oldOrientation = savedInstanceState.getInt(
          Constants.KEY_OLD_ORIENTATION,
          Configuration.ORIENTATION_UNDEFINED);
      final int newPostion = new PositionCalculator(
          Constants.MAX_CARDS_INFO)
          .calculatePositionInNewOrientation(oldPosition,
              oldOrientation, currentOrientation);
      listView.post(new Runnable() {

        @Override
        public void run() {
          listView.setSelection(newPostion);
        }
      });
    }
  }

  // //////////////////////////////////////////////////////////////////////////////
  // TO MAINTAIN CORRECT POSITION AFTER ORIENTATION CHANGE
  // //////////////////////////////////////////////////////////////////////////////

  @Override
  protected String getToastMessage() {
    // Sending null to avoid showing toast.
    return null;
  }
}

Java Source Code List

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