Configure.java

/*
Copyright (C) 2011 The University of Michigan

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Please send inquiries to powertutor@umich.edu
*/

package edu.umich.PowerTutor.widget;

import edu.umich.PowerTutor.R;
import edu.umich.PowerTutor.util.HexEncode;

import android.app.Activity;
import android.appwidget.AppWidgetManager;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import android.widget.ListView;

import java.util.ArrayList;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.io.IOException;

public class Configure extends Activity {
  private static final String TAG = "Configure";

  private int widgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
  
  private ArrayAdapter adapter;
  private DataSource[] dataSource;
  private WidgetItem[] items;

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setResult(RESULT_CANCELED);

    Intent intent = getIntent();
    Bundle extras = intent.getExtras();
    if(extras != null) {
      widgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID,
                               AppWidgetManager.INVALID_APPWIDGET_ID);
    }
    if(widgetId == AppWidgetManager.INVALID_APPWIDGET_ID) {
      finish();
    }

    setContentView(R.layout.widget_configure);
    findViewById(R.id.save_button).setOnClickListener(
      new View.OnClickListener() {
        public void onClick(View v) {
          String val = "";
          try {
            ByteArrayOutputStream ba = new ByteArrayOutputStream();
            ObjectOutputStream objout = new ObjectOutputStream(ba);
            for(int i = 0; i < dataSource.length; i++) {
              objout.writeObject(dataSource[i]);
            }
            objout.close();
            val = HexEncode.encode(ba.toByteArray());
          } catch(IOException e) {
            Log.w(TAG, "Failed to write data sources to string");
            finish();
          }
          String key = "widget_" + widgetId;

          SharedPreferences prefs =
              PreferenceManager.getDefaultSharedPreferences(Configure.this);
          prefs.edit().putString(key, val).commit();

          Intent resultValue = new Intent();
          resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId);
          setResult(RESULT_OK, resultValue);
          finish();
        }
      });
    findViewById(R.id.cancel_button).setOnClickListener(
      new View.OnClickListener() {
        public void onClick(View v) {
          finish();
        }
      });

    final ListView listView = (ListView)findViewById(R.id.list);
    adapter = new ArrayAdapter(this, 0) {
      public View getView(int position, View convertView, ViewGroup parent) {
        View itemView = getLayoutInflater()
            .inflate(R.layout.widget_item_layout, listView, false);
        TextView title = (TextView)itemView.findViewById(R.id.title);
        TextView summary = (TextView)itemView.findViewById(R.id.summary);
        WidgetItem item = (WidgetItem)getItem(position);
        item.setupView(title, summary);
        return itemView;
      }
    };

    dataSource = DataSource.getDefaults();
    items = new WidgetItem[3];

    for(int i = 0; i < 3; i++) {
      items[i] = new WidgetItem(i);
      adapter.add(items[i]);
    }
    listView.setAdapter(adapter);
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
      public void onItemClick(AdapterView parent, View view,
                              int position, long id) {
        items[position].onClick();
      }
    });
  }

  @Override
  protected void onActivityResult(int reqCode, int resCode, Intent data) {
    if(resCode == RESULT_OK) {
      Bundle extras = data.getExtras();
      DataSource dataSrc = (DataSource)extras.getSerializable("data_source");
      dataSource[reqCode] = dataSrc;
      adapter.notifyDataSetChanged();
    }
  }

  private class WidgetItem {
    private int columnId;

    public WidgetItem(int columnId) {
      this.columnId = columnId;
    }
  
    public void setupView(TextView title, TextView summary) {
      title.setText("Column " + (columnId + 1) + " - " +
                    dataSource[columnId].getTitle());
      summary.setText(dataSource[columnId].getDescription());
    }

    public void onClick() {
      Intent startIntent = new Intent(Configure.this,
                                      DataSourceConfigure.class);
      startActivityForResult(startIntent, columnId);
    }
  }
}