Android Open Source - rhetolog M R U Adapter

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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...

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

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