Android Open Source - ironcontrol-for-android Prompt Spinner Adapter

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License

The source code is released under:
Apache License
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Java Source Code

/*
 * #%L//from ww  w  .ja  v a 2  s.  c  o m
 * =====================================================
 *   _____                _     ____  _   _       _   _
 *  |_   _|_ __ _   _ ___| |_  / __ \| | | | ___ | | | |
 *    | | | '__| | | / __| __|/ / _` | |_| |/ __|| |_| |
 *    | | | |  | |_| \__ \ |_| | (_| |  _  |\__ \|  _  |
 *    |_| |_|   \__,_|___/\__|\ \__,_|_| |_||___/|_| |_|
 *                             \____/
 * 
 * =====================================================
 * 
 * Hochschule Hannover
 * (University of Applied Sciences and Arts, Hannover)
 * Faculty IV, Dept. of Computer Science
 * Ricklinger Stadtweg 118, 30459 Hannover, Germany
 * 
 * Email: trust@f4-i.fh-hannover.de
 * Website: http://trust.f4.hs-hannover.de/
 * 
 * This file is part of ironcontrol for android, version 1.0.1, implemented by the Trust@HsH research group at the Hochschule Hannover.
 * %%
 * Copyright (C) 2013 Trust@HsH
 * %%
 * 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.
 * #L%
 */
package de.hshannover.f4.trust.ironcontrol.view.util;

import java.util.List;

import android.content.Context;
import android.database.DataSetObserver;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.SpinnerAdapter;
import android.widget.TextView;

/**
 * Class for PromptSpinnerAdapter
 * 
 *         Decorator Adapter to allow a Spinner to show a 'Nothing Selected...'
 *         initially displayed instead of the first choice in the Adapter.
 * 
 *         Modified Class from http://de.softuses.com/108509 *
 * 
 * @author Marcel Reichenbach
 * @version 1.0
 */

public class PromptSpinnerAdapter implements SpinnerAdapter, ListAdapter  {

  private static final int PROMPT_OFFSET = 1;

  private ArrayAdapter<CharSequence> mAdapter;

  private CharSequence prompt;

  private Context context;

  private boolean emptyList;

  protected PromptSpinnerAdapter(Context context, CharSequence prompt, int textArrayResId, List<CharSequence> data) {
    this.context = context;
    this.prompt = prompt;

    if(data != null){
      // List<CharSequence>
      if(data.isEmpty()){    // For a empty list, no item can picked

        data.add("empty");
        emptyList = true;

      }

      this.mAdapter = new ArrayAdapter<CharSequence>(context, android.R.layout.simple_spinner_item, data);

    } else {
      // textArrayResId
      this.mAdapter = ArrayAdapter.createFromResource(context, textArrayResId, android.R.layout.simple_spinner_item);

    }

    this.mAdapter .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
  }

  /**
   * Use this constructor to Define your 'Prompt' layout as the first
   * row in the returned choices. If you do this, you probably don't want a
   * prompt on your spinner or it'll have two 'Select' rows.
   * 
   * @param context      The Activity Context
   * @param prompt      The first TextView in your Spinner
   * @param textArrayResId   The the array to use as the data source.
   */

  public PromptSpinnerAdapter(Context context, CharSequence prompt, int textArrayResId) {
    this(context, prompt, textArrayResId, null);
  }

  /**
   * Use this constructor to Define your 'Prompt' layout as the first
   * row in the returned choices. If you do this, you probably don't want a
   * prompt on your spinner or it'll have two 'Select' rows.
   * 
   * @param context      The Activity Context
   * @param prompt      The first TextView in your Spinner
   * @param data         The list to use as the data source.
   */

  public PromptSpinnerAdapter(Context context, CharSequence prompt, List<CharSequence> data) {
    this(context, prompt, -1, data);
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    if (position != 0) {

      return mAdapter.getView(position - PROMPT_OFFSET, null, parent);

    } else {
      View output = null;

      if (convertView instanceof TextView) {

        output = convertView;

      } else {

        output = new TextView(context);

      }

      ((TextView) output).setText(prompt);
      ((TextView) output).setTextSize(16);

      return output;
    }
  }

  @Override
  public View getDropDownView(int position, View convertView, ViewGroup parent) {
    if (position == 0) {
      return new View(context);
    }
    return mAdapter.getDropDownView(position - PROMPT_OFFSET, null, parent); // could re-use the convertView if possible, utilize setTag...
  }

  @Override
  public int getCount() {
    int count = mAdapter.getCount();
    return count == 0 ? 0 : count + PROMPT_OFFSET;
  }

  @Override
  public CharSequence getItem(int position) {
    return position == 0 ? "" : mAdapter.getItem(position - PROMPT_OFFSET);
  }

  @Override
  public int getItemViewType(int position) {

    // doesn't work!! Vote to Fix!
    // http://code.google.com/p/android/issues/detail?id=17128 - Spinner
    // does not support multiple view types
    // This method determines what is the convertView, this should return 1
    // for pos 0 or return 0 otherwise.

    return position == 0 ? getViewTypeCount() - PROMPT_OFFSET : mAdapter.getItemViewType(position - PROMPT_OFFSET);
  }

  @Override
  public int getViewTypeCount() {
    return mAdapter.getViewTypeCount() + PROMPT_OFFSET;
  }

  @Override
  public long getItemId(int position) {
    return mAdapter.getItemId(position - PROMPT_OFFSET);
  }

  @Override
  public boolean hasStableIds() {
    return mAdapter.hasStableIds();
  }

  @Override
  public boolean isEmpty() {
    return mAdapter.isEmpty();
  }

  @Override
  public void registerDataSetObserver(DataSetObserver observer) {
    // TODO schauen ob doch noch wieder rein nehmen, hat im logcat meldungen verursacht (glaube)
    mAdapter.registerDataSetObserver(observer);
  }

  @Override
  public void unregisterDataSetObserver(DataSetObserver observer) {
    mAdapter.unregisterDataSetObserver(observer);
  }

  @Override
  public boolean areAllItemsEnabled() {
    return false;
  }

  @Override
  public boolean isEnabled(int position) {
    if(position == 0 || emptyList){  // don't allow the PROMPT-Item to be picked or list is empty
      return false;
    }
    return true;
  }
}
Java Source Code List
