Android Open Source - rhetolog M R U Adapter

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Back to project page rhetolog.
License

The source code is released under:
Copyright (c) 2012 Kirk Zurell Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Soft...
If you think the Android project rhetolog listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package name.zurell.kirk.apps.android.rhetolog;
//from  ww w  .  j a v  a  2 s. c  om
/*
 * Copyright (c) 2012 Kirk Zurell
 *
 * See the file LICENSE for copying permission.
 */

import java.util.Map;

import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.LightingColorFilter;
import android.view.DragEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnDragListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;

public class MRUAdapter extends ArrayAdapter<Fallacy> implements OnDragListener {

  @SuppressWarnings("unused")
  private static String TAG = MRUAdapter.class.getSimpleName();
  
  
  private static final String MRUPREFSSECTION = "MRU";
  
  // Reference to adapter's own list.
  ViewGroup list;
  
  // Reference to adapters own context.
  Context context;
  
  // TextViewResourceId should not be used.
  public MRUAdapter(Context context, int textViewResourceId) {
    super(context, textViewResourceId);
  
    this.context = context;
    
    // Reload list contents from preferences
    SharedPreferences sp = context.getSharedPreferences(MRUPREFSSECTION, Context.MODE_PRIVATE);
    Map<String,?> map = sp.getAll();
    for (String each : map.keySet()) {
      String val = (String) map.get(each);
      Fallacy fal = RhetologApplication.getFallacyNamed(val);
      this.add(fal);
    }
    
    
    
  }
  
  /* (non-Javadoc)
   * @see android.widget.ArrayAdapter#getView(int, android.view.View, android.view.ViewGroup)
   */
  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    
    if (convertView == null) {
      convertView = LayoutInflater.from(getContext()).inflate(R.layout.mruentry, null);
    }
    
    Fallacy fallacyToUse = this.getItem(position);
    
    //inform view which fallacy to show.
    MRUView asMRUView = (MRUView) convertView;
    asMRUView.setFallacy(fallacyToUse);
    
    return convertView;
  }

  /**
   * @return The list of MRU Fallacies.
   */
  public ViewGroup getList() {
    return list;
  }

  /**
   * @param list The list to set
   */
  public void setList(ViewGroup list) {
    this.list = list;
    list.setOnDragListener(this);
  }

  
  
  /**
   * Drag and Drop functionality for the MRU list: show states
   */
  
  final LightingColorFilter mediumDropColor = new LightingColorFilter(0xFF404040, 0xFF101010);
  final LightingColorFilter lightDropColor = new LightingColorFilter(0xFF808080, 0xFF101010);
  
  final float DROP_POSSIBLE = 0.3f;
  final float DROP_PROBABLE = 0.6f;
  final float DROP_NONE = 1.0f;
  
  @Override
  public boolean onDrag(View v, DragEvent event) {
    
    boolean result = true;
    
    int action = event.getAction();
    
    if (v.equals(getList())) {
      
      // Handle for MRU list
      switch (action) {
      case DragEvent.ACTION_DRAG_STARTED:
        list.setAlpha(DROP_POSSIBLE);
        break;
      case DragEvent.ACTION_DRAG_ENTERED:
        list.setAlpha(DROP_PROBABLE);
        break;
      case DragEvent.ACTION_DRAG_EXITED:
        list.setAlpha(DROP_POSSIBLE);
        break;
      case DragEvent.ACTION_DROP:
        list.setAlpha(DROP_NONE);
        Fallacy payload = (Fallacy) event.getLocalState();
        addFallacyToMRU(payload);
        break;
      case DragEvent.ACTION_DRAG_ENDED:
        list.setAlpha(DROP_NONE);
        break;
      default:
        result = false;
      }
      
    } else {
      
      // Handle for drop on FallacyList (or anywhere else), indicates removal from MRU list.
      switch (action) {
      case DragEvent.ACTION_DRAG_STARTED:
        break;
      case DragEvent.ACTION_DROP:
        Fallacy payload = (Fallacy) event.getLocalState();
        if (payload != null)
          removeFallacyFromMRU(payload);
        break;
      case DragEvent.ACTION_DRAG_ENDED:
        break;
      default:
        result = false;
      }
      
    }
    
    return result;
  }
  
  
  private void addFallacyToMRU(Fallacy fallacy) {
    
    int curPosIfAny = this.getPosition(fallacy);
    if (curPosIfAny != -1) {
      return; // Already present, ignore addition
    }
    
    int second_last_position = this.getCount() - 1;
    if (second_last_position < 0) second_last_position = 0;
      
    this.insert(fallacy, second_last_position);
      
    commitMRUToPrefs();
  }
  
  private void removeFallacyFromMRU(Fallacy fallacy) {
    
    int curPosIfAny = this.getPosition(fallacy);
    if (curPosIfAny == -1) {
      return; // Not already present, ignore removal (?)
    }
    
    this.remove(fallacy);
    
    commitMRUToPrefs();
  }
  
  private void commitMRUToPrefs() {
    // Clear previous MRU preference, add new list
    SharedPreferences sp = context.getSharedPreferences(MRUPREFSSECTION, 
        Context.MODE_PRIVATE);
    SharedPreferences.Editor ed = sp.edit();
    ed.clear();

    for (int i = 0; i < this.getCount(); i++) {
      Fallacy each = this.getItem(i);
      if (each == null) continue;
      ed.putString(each.getName(), each.getName());
    }

    ed.commit();
  }
  
}
Java Source Code List
