com.commonsware.android.fts.QuestionsFragment.java Source code

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Here is the source code for com.commonsware.android.fts.QuestionsFragment.java

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/***
  Copyright (c) 2013-2014 CommonsWare, LLC
  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.
      
  Covered in detail in the book _The Busy Coder's Guide to Android Development_
https://commonsware.com/Android
 */

package com.commonsware.android.fts;

import android.support.v4.app.ListFragment;
import android.database.Cursor;
import android.os.Bundle;
import android.text.Html;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SearchView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

public class QuestionsFragment extends ListFragment
        implements SearchView.OnQueryTextListener, MenuItem.OnActionExpandListener {
    interface Contract {
        void onQuestionClicked(String url);
    }

    private static final String STATE_QUERY = "q";
    private SearchView sv = null;
    private String initialQuery = null;
    private String lastQuery = null;

    @Override
    public void onCreate(Bundle state) {
        super.onCreate(state);

        setHasOptionsMenu(true);

        if (state != null) {
            initialQuery = state.getString(STATE_QUERY);
            lastQuery = initialQuery;
        }
    }

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

        EventBus.getDefault().register(this);
    }

    @Override
    public void onStop() {
        EventBus.getDefault().unregister(this);

        super.onStop();
    }

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

        SimpleCursorAdapter adapter = new SimpleCursorAdapter(getActivity(), R.layout.row, null,
                new String[] { DatabaseHelper.TITLE, DatabaseHelper.PROFILE_IMAGE },
                new int[] { R.id.title, R.id.icon }, 0);

        adapter.setViewBinder(new QuestionBinder());
        setListAdapter(adapter);
    }

    @Override
    public void onSaveInstanceState(Bundle state) {
        super.onSaveInstanceState(state);

        if (!sv.isIconified()) {
            state.putString(STATE_QUERY, sv.getQuery().toString());
        }
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.actions, menu);

        configureSearchView(menu);

        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        SimpleCursorAdapter adapter = (SimpleCursorAdapter) getListAdapter();
        Cursor row = (Cursor) adapter.getItem(position);
        int link = row.getColumnIndex(DatabaseHelper.LINK);

        ((Contract) getActivity()).onQuestionClicked(row.getString(link));
    }

    @Override
    public boolean onQueryTextChange(String newText) {
        return (false);
    }

    @Override
    public boolean onQueryTextSubmit(String query) {
        doSearch(query);

        return (true);
    }

    @Override
    public boolean onMenuItemActionExpand(MenuItem item) {
        return (true);
    }

    @Override
    public boolean onMenuItemActionCollapse(MenuItem item) {
        clearSearch();

        return (true);
    }

    @Subscribe(sticky = true, threadMode = ThreadMode.MAIN)
    public void onModelLoaded(ModelLoadedEvent event) {
        ((SimpleCursorAdapter) getListAdapter()).changeCursor(event.model);

        if (sv != null) {
            sv.setEnabled(true);
        }
    }

    private void configureSearchView(Menu menu) {
        MenuItem search = menu.findItem(R.id.search);

        search.setOnActionExpandListener(this);
        sv = (SearchView) search.getActionView();
        sv.setOnQueryTextListener(this);
        sv.setSubmitButtonEnabled(true);
        sv.setIconifiedByDefault(true);

        if (initialQuery != null) {
            sv.setIconified(false);
            search.expandActionView();
            sv.setQuery(initialQuery, true);
        }
    }

    private void doSearch(String match) {
        if (!match.equals(lastQuery)) {
            lastQuery = match;

            if (sv != null) {
                sv.setEnabled(false);
            }

            EventBus.getDefault().post(new SearchRequestedEvent(match));
        }
    }

    private void clearSearch() {
        if (lastQuery != null) {
            lastQuery = null;

            sv.setEnabled(false);
            EventBus.getDefault().post(new SearchRequestedEvent(null));
        }
    }

    private class QuestionBinder implements SimpleCursorAdapter.ViewBinder {
        int size;

        QuestionBinder() {
            size = getActivity().getResources().getDimensionPixelSize(R.dimen.icon);
        }

        @Override
        public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
            switch (view.getId()) {
            case R.id.title:
                ((TextView) view).setText(Html.fromHtml(cursor.getString(columnIndex)));

                return (true);

            case R.id.icon:
                Picasso.with(getActivity()).load(cursor.getString(columnIndex)).resize(size, size).centerCrop()
                        .placeholder(R.drawable.owner_placeholder).error(R.drawable.owner_error)
                        .into((ImageView) view);

                return (true);
            }

            return (false);
        }
    }
}