Android Open Source - masterdetail-j2objc-swift Master Fragment

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2014 Kirk C. Vogen//w  w w  .j a v a  2s.  c  om
 *
 * 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 masterdetail.android;

import java.util.List;

import masterdetail.android.service.LocalStorageService;
import masterdetail.android.service.ServiceAdapter;
import masterdetail.model.DetailEntry;
import masterdetail.service.FlatFileDetailService;
import masterdetail.service.DetailService;
import masterdetail.service.StorageService;
import masterdetail.viewmodel.DetailViewModel;

import android.app.Activity;
import android.app.ListFragment;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.Loader;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
//import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

/**
 * A list fragment representing a list of detail entries. This fragment also supports tablet devices
 * by allowing list items to be given an 'activated' state upon selection. This helps indicate which
 * item is currently being viewed in a {@link DetailFragment}.
 * <p>
 * Activities containing this fragment MUST implement the {@link Callbacks} interface.
 */
public class MasterFragment extends ListFragment implements LoaderCallbacks<List<DetailEntry>> {

  private static final int THE_LOADER = 0x01;

  /**
   * The serialization (saved instance state) Bundle key representing the activated item position.
   * Only used on tablets.
   */
  private static final String STATE_ACTIVATED_POSITION = "activated_position";

  /** The fragment's current callback object, which is notified of list item clicks. */
  private Callbacks mCallbacks = sDummyCallbacks;

  /** The current activated item position. Only used on tablets. */
  private int mActivatedPosition = ListView.INVALID_POSITION;

  /**
   * A callback interface that all activities containing this fragment must implement. This
   * mechanism allows activities to be notified of item selections.
   */
  public interface Callbacks {
    /**
     * Callback for when an item has been selected.
     */
    public void onItemSelected(int id);
  }

  /**
   * A dummy implementation of the {@link Callbacks} interface that does nothing. Used only when
   * this fragment is not attached to an activity.
   */
  private static Callbacks sDummyCallbacks = new Callbacks() {
    @Override
    public void onItemSelected(int id) {
    }
  };

  /**
   * Mandatory empty constructor for the fragment manager to instantiate the fragment (e.g. upon
   * screen orientation changes).
   */
  public MasterFragment() {
  }

  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    setEmptyText("Please create a list");
  }

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getLoaderManager().initLoader(THE_LOADER, null, this).forceLoad();
  }

  @Override
  public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    // Restore the previously serialized activated item position.
    if (savedInstanceState != null && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
      setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION));
    }
  }

  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);

    // Activities containing this fragment must implement its callbacks.
    if (!(activity instanceof Callbacks)) {
      throw new IllegalStateException("Activity must implement fragment's callbacks.");
    }

    mCallbacks = (Callbacks) activity;
  }

  @Override
  public void onDetach() {
    super.onDetach();

    // Reset the active callbacks interface to the dummy implementation.
    mCallbacks = sDummyCallbacks;
  }

  @Override
  public void onListItemClick(ListView listView, View view, int position, long id) {
    super.onListItemClick(listView, view, position, id);

    // Notify the active callbacks interface (the activity, if the fragment is attached to one)
    // that an item has been selected.
    DetailEntry list = (DetailEntry) getListAdapter().getItem(position);
    mCallbacks.onItemSelected(list.getId());
  }

  @Override
  public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    if (mActivatedPosition != ListView.INVALID_POSITION) {
      // Serialize and persist the activated item position.
      outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
    }
  }

  /**
   * Turns on activate-on-click mode. When this mode is on, list items will be given the
   * 'activated' state when touched.
   */
  public void setActivateOnItemClick(boolean activateOnItemClick) {
    // When setting CHOICE_MODE_SINGLE, ListView will automatically give items the 'activated'
    // state when touched.
    getListView().setChoiceMode(
        activateOnItemClick ? ListView.CHOICE_MODE_SINGLE : ListView.CHOICE_MODE_NONE);
  }

  private void setActivatedPosition(int position) {
    if (position == ListView.INVALID_POSITION) {
      getListView().setItemChecked(mActivatedPosition, false);
    } else {
      getListView().setItemChecked(position, true);
    }

    mActivatedPosition = position;
  }

  @Override
  public Loader<List<DetailEntry>> onCreateLoader(int id, Bundle args) {
    StorageService storageService = new LocalStorageService(getActivity());
    DetailService detailService = new FlatFileDetailService(storageService);

    MasterDetailLoader loader = new MasterDetailLoader(getActivity(), detailService);

    return loader;
  }

  @Override
  public void onLoadFinished(Loader<List<DetailEntry>> loader, List<DetailEntry> list) {
    StorageService storageService = new LocalStorageService(getActivity());
    final DetailService detailService = new FlatFileDetailService(storageService);

    ServiceAdapter listAdapter = new ServiceAdapter(detailService) {

      @Override
      public View getView(int position, View convertView, android.view.ViewGroup parent) {
        View row;

        if (null == convertView) {
          LayoutInflater inflater = LayoutInflater.from(getActivity());
          row = inflater.inflate(android.R.layout.two_line_list_item, parent, false);
        } else {
          row = convertView;
        }

        DetailViewModel viewModel = new DetailViewModel(detailService, " ");
        viewModel.init(position);

        TextView text1 = (TextView) row.findViewById(android.R.id.text1);
        text1.setText(viewModel.getTitle());

        TextView text2 = (TextView) row.findViewById(android.R.id.text2);
        text2.setText(viewModel.getWords());

        return row;
      }
    };

    setListAdapter(listAdapter);

    if (isResumed()) {
      setListShown(true);
    } else {
      setListShownNoAnimation(true);
    }
  }

  @Override
  public void onLoaderReset(Loader<List<DetailEntry>> arg0) {
    // TODO: May need to actually do something here when using a CursorAdapter in the future
    // Note that getListView() will throw an exception. Instead, the adapter may need to be
    // store in an instance variable so that it can be access here.
    // getListView().setAdapter(null);
  }
}

Java Source Code List

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