ChooseActivityTypeDialogFragment.java

/*
 * Copyright 2013 Google Inc.
 *
 * 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.
 */

package com.google.android.apps.mytracks.fragments;

import com.google.android.apps.mytracks.util.DialogUtils;
import com.google.android.apps.mytracks.util.PreferencesUtils;
import com.google.android.apps.mytracks.util.StringUtils;
import com.google.android.apps.mytracks.util.TrackIconUtils;
import com.google.android.maps.mytracks.R;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
 * A DialogFragment to choose an activity type.
 * 
 * @author apoorvn
 */
public class ChooseActivityTypeDialogFragment extends DialogFragment {

  /**
   * Interface for caller of this dialog fragment.
   * 
   * @author apoorvn
   */
  public interface ChooseActivityTypeCaller {

    /**
     * Called when choose activity type is done.
     */
    public void onChooseActivityTypeDone(String iconValue, boolean newWeight);
  }

  public static final String CHOOSE_ACTIVITY_TYPE_DIALOG_TAG = "chooseActivityType";

  private static final String KEY_CATEGORY = "category";

  private ChooseActivityTypeCaller caller;

  public static ChooseActivityTypeDialogFragment newInstance(String category) {
    Bundle bundle = new Bundle();
    bundle.putString(KEY_CATEGORY, category);

    ChooseActivityTypeDialogFragment fragment = new ChooseActivityTypeDialogFragment();
    fragment.setArguments(bundle);
    return fragment;
  }

  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
      caller = (ChooseActivityTypeCaller) activity;
    } catch (ClassCastException e) {
      throw new ClassCastException(activity.toString() + " must implement "
          + ChooseActivityTypeCaller.class.getSimpleName());
    }
  }

  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    return getDialog(getActivity(), getArguments().getString(KEY_CATEGORY), caller);
  }

  public static Dialog getDialog(
      final Activity activity, final String category, final ChooseActivityTypeCaller caller) {
    View view = activity.getLayoutInflater().inflate(R.layout.choose_activity_type, null);
    GridView gridView = (GridView) view.findViewById(R.id.choose_activity_type_grid_view);
    final View weightContainer = view.findViewById(R.id.choose_activity_type_weight_container);

    TextView weightLabel = (TextView) view.findViewById(R.id.choose_activity_type_weight_label);
    weightLabel.setText(
        PreferencesUtils.isMetricUnits(activity) ? R.string.description_weight_metric
            : R.string.description_weight_imperial);

    final TextView weight = (TextView) view.findViewById(R.id.choose_activity_type_weight);

    List<Integer> imageIds = new ArrayList<Integer>();
    for (String iconValue : TrackIconUtils.getAllIconValues()) {
      imageIds.add(TrackIconUtils.getIconDrawable(iconValue));
    }

    Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(activity.getResources(), R.drawable.ic_track_airplane, options);
    int padding = 32;
    int width = options.outWidth + 2 * padding;
    int height = options.outHeight + 2 * padding;
    gridView.setColumnWidth(width);

    final ChooseActivityTypeImageAdapter imageAdapter = new ChooseActivityTypeImageAdapter(
        activity, imageIds, width, height, padding);
    gridView.setAdapter(imageAdapter);

    final String weightValue = StringUtils.formatWeight(
        PreferencesUtils.getWeightDisplayValue(activity));
    final AlertDialog alertDialog = new AlertDialog.Builder(activity).setNegativeButton(
        R.string.generic_cancel, null)
        .setPositiveButton(R.string.generic_ok, new Dialog.OnClickListener() {

            @Override
          public void onClick(DialogInterface dialog, int which) {
            boolean newWeight = false;
            if (weightContainer.getVisibility() == View.VISIBLE) {
              String newValue = weight.getText().toString();
              if (!newValue.equals(weightValue)) {
                newWeight = true;
                PreferencesUtils.storeWeightValue(activity, newValue);
              }
            }
            int selected = imageAdapter.getSelected();
            caller.onChooseActivityTypeDone(
                TrackIconUtils.getAllIconValues().get(selected), newWeight);
          }
        }).setTitle(R.string.track_edit_activity_type_hint).setView(view).create();
    alertDialog.setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
      public void onShow(DialogInterface dialog) {
        int position = getPosition(activity, category);
        alertDialog.getButton(Dialog.BUTTON_POSITIVE).setEnabled(position != -1);
        if (position != -1) {
          imageAdapter.setSelected(position);
          imageAdapter.notifyDataSetChanged();
        }
        updateWeightContainer(weightContainer, position);
        weight.setText(weightValue);
        DialogUtils.setDialogTitleDivider(activity, alertDialog);
      }
    });

    gridView.setOnItemClickListener(new OnItemClickListener() {
        @Override
      public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
        alertDialog.getButton(Dialog.BUTTON_POSITIVE).setEnabled(true);
        imageAdapter.setSelected(position);
        imageAdapter.notifyDataSetChanged();
        updateWeightContainer(weightContainer, position);
      }
    });
    return alertDialog;
  }

  private static int getPosition(Activity activity, String category) {
    if (category == null) {
      return -1;
    }
    String iconValue = TrackIconUtils.getIconValue(activity, category);
    if (iconValue.equals("")) {
      return -1;
    }
    List<String> iconValues = TrackIconUtils.getAllIconValues();
    for (int i = 0; i < iconValues.size(); i++) {
      if (iconValues.get(i).equals(iconValue)) {
        return i;
      }
    }
    return -1;
  }

  private static void updateWeightContainer(View weightContainer, int position) {
    boolean showWeight = position == 0 || position == 1 || position == 2;
    weightContainer.setVisibility(showWeight ? View.VISIBLE : View.GONE);
  }
}