Android Open Source - checkin Check In List Adapter

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License

The source code is released under:

# License Copyright ? 2014 Sam Whited Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ?Software??), to deal ...

Java Source Code

package com.samwhited.checkin;
//  ww w  .  j  ava2 s  .c o  m
import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;

import com.samwhited.checkin.database.CheckInOpenHelper;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

public class CheckInListAdapter extends SimpleCursorAdapter implements AbsListView.RecyclerListener {

  private boolean batchMode;
  private final LayoutInflater inflater;

  private final Set<Long> batchSet = Collections.synchronizedSet(new HashSet<Long>());

  public Set<Long> getBatchSet() {
    return batchSet;
  }

  public void initializeBatchMode(final boolean batchMode) {
    this.batchMode = batchMode;
    unselectAllCheckIns();
  }

  private void unselectAllCheckIns() {
    this.batchSet.clear();
    this.notifyDataSetChanged();
  }

  /**
   * Standard constructor.
   *
   * @param context The context where the ListView associated with this
   *                SimpleListItemFactory is running
   * @param layout  resource identifier of a layout file that defines the views
   *                for this list item. The layout file should include at least
   *                those named views defined in "to"
   * @param c       The database cursor.  Can be null if the cursor is not available yet.
   * @param from    A list of column names representing the data to bind to the UI.  Can be null
   *                if the cursor is not available yet.
   * @param to      The views that should display column in the "from" parameter.
   *                These should all be TextViews. The first N views in this list
   *                are given the values of the first N columns in the from
   *                parameter.  Can be null if the cursor is not available yet.
   * @param flags   Flags used to determine the behavior of the adapter,
   *                as per {@link android.widget.CursorAdapter#CursorAdapter(android.content.Context, android.database.Cursor, int)}.
   */
  public CheckInListAdapter(final Context context,
                final int layout,
                final Cursor c,
                final String[] from,
                final int[] to,
                final int flags) {
    super(context, layout, c, from, to, flags);
    this.inflater = LayoutInflater.from(context);
    this.batchMode = false;
  }

  /**
   * Makes a new view to hold the data pointed to by cursor.
   *
   * @param context Interface to application's global information
   * @param cursor  The cursor from which to get the data. The cursor is already
   *                moved to the correct position.
   * @param parent  The parent to which the new view is attached to
   * @return the newly created view.
   */
  @Override
  public View newView(final Context context, final Cursor cursor, final ViewGroup parent) {
    return inflater.inflate(R.layout.checkin_list_item_view, parent, false);
  }

  /**
   * Binds all of the field names passed into the "to" parameter of the
   * constructor with their corresponding cursor columns as specified in the
   * "from" parameter.
   * <p/>
   * Binding occurs in two phases. First, if a
   * {@link android.widget.SimpleCursorAdapter.ViewBinder} is available,
   * {@link android.widget.SimpleCursorAdapter.ViewBinder#setViewValue(android.view.View, android.database.Cursor, int)}
   * is invoked. If the returned value is true, binding has occured. If the
   * returned value is false and the view to bind is a TextView,
   * {@link #setViewText(android.widget.TextView, String)} is invoked. If the returned value is
   * false and the view to bind is an ImageView,
   * {@link #setViewImage(android.widget.ImageView, String)} is invoked. If no appropriate
   * binding can be found, an {@link IllegalStateException} is thrown.
   *
   * @param view The view to bind.
   * @param context The context to use.
   * @param cursor A cursor pointing to the data to use.
   * @throws IllegalStateException if binding cannot occur
   * @see android.widget.CursorAdapter#bindView(android.view.View,
   * android.content.Context, android.database.Cursor)
   * @see #getViewBinder()
   * @see #setViewBinder(android.widget.SimpleCursorAdapter.ViewBinder)
   * @see #setViewImage(android.widget.ImageView, String)
   * @see #setViewText(android.widget.TextView, String)
   */
  @Override
  public void bindView(final View view, final Context context, final Cursor cursor) {
    final long id = cursor.getLong(cursor.getColumnIndex(CheckInOpenHelper.ID_NAME));
    if (id != -1) {
      ((CheckInListItem) view).set(cursor, batchSet, batchMode);
    }
  }

  public void toggleInBatchSet(final long id) {
    if (batchSet.contains(id)) {
      batchSet.remove(id);
    } else {
      batchSet.add(id);
    }
  }

  /**
   * Called when the {@link android.database.ContentObserver} on the cursor receives a change notification.
   * The default implementation provides the auto-requery logic, but may be overridden by
   * sub classes.
   *
   * @see android.database.ContentObserver#onChange(boolean)
   */
  @Override
  protected void onContentChanged() {
    super.onContentChanged();
  }

  /**
   * Indicates that the specified View was moved into the recycler's scrap heap.
   * The view is not displayed on screen any more and any expensive resource
   * associated with the view should be discarded.
   *
   * @param view The {@link com.samwhited.checkin.CheckInListItem} to unbind.
   */
  @Override
  public void onMovedToScrapHeap(final View view) {
    // Discard references to icon drawables so they can be garbage collected.
    final TextView dateView = (TextView)view.findViewById(R.id.date);
    dateView.setCompoundDrawables(null, null, null, null);
  }
}

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