Java tutorial
/* * Copyright (C) 2014 The Android Open Source Project * * 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.beesham.popularmovies; import android.content.SharedPreferences; import android.database.Cursor; import android.os.Bundle; import android.os.Handler; import android.preference.PreferenceManager; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.GridView; import com.beesham.popularmovies.data.MoviesContract; import com.beesham.popularmovies.data.MoviesContract.MoviesFavoriteEntry; import com.beesham.popularmovies.data.MoviesContract.MoviesEntry; import com.beesham.popularmovies.sync.MoviesSyncAdapter; /** * A simple {@link Fragment} subclass. * Displays movies based on popularity or highest rated */ public class DiscoveryFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> { private static final String LOG_TAG = DiscoveryFragment.class.getSimpleName(); private static final int MOVIES_LOADER = 1; private static final int MOVIES_FAVORITE_LOADER = 2; private GridView mMoviesGridView; private ImageAdapter mImageAdapter; private boolean mTwoPane = false; private String SELECTED_KEY = "selected_position"; private int mPosition = GridView.INVALID_POSITION; public interface Callback { void setActionBarTitle(String title); } public DiscoveryFragment() { setHasOptionsMenu(true); } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { getLoaderManager().initLoader(MOVIES_LOADER, null, this); super.onActivityCreated(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_discovery, container, false); mMoviesGridView = (GridView) rootView.findViewById(R.id.movies_gridview); mImageAdapter = new ImageAdapter(getContext()); mMoviesGridView.setEmptyView(rootView.findViewById(R.id.empty_view)); mMoviesGridView.setAdapter(mImageAdapter); mMoviesGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity()); String sort_by = prefs.getString(getContext().getString(R.string.pref_sort_key), getContext().getString(R.string.pref_sort_default)); Cursor c = (Cursor) adapterView.getItemAtPosition(position); if (sort_by.equals(getString(R.string.pref_sort_favorite))) { if (c != null) { ((DetailsFragment.Callback) getActivity()) .onItemSelected( MoviesContract.MoviesFavoriteEntry.CONTENT_URI.buildUpon() .appendPath(c.getString( c.getColumnIndex(MoviesFavoriteEntry.COLUMN_MOVIE_TITLE))) .build()); } } else { if (c != null) { ((DetailsFragment.Callback) getActivity()).onItemSelected(MoviesEntry.CONTENT_URI .buildUpon() .appendPath(c.getString(c.getColumnIndex(MoviesEntry.COLUMN_MOVIE_TITLE))).build()); } } mPosition = position; } }); if (savedInstanceState != null && savedInstanceState.containsKey(SELECTED_KEY)) { mPosition = savedInstanceState.getInt(SELECTED_KEY); } return rootView; } public void setTwoPane(boolean twoPane) { if (twoPane) { mTwoPane = true; } } void onSortChanged() { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity()); String sort_by = prefs.getString(getContext().getString(R.string.pref_sort_key), getContext().getString(R.string.pref_sort_default)); if (sort_by.equals(getString(R.string.pref_sort_favorite))) { mPosition = GridView.INVALID_POSITION; getLoaderManager().restartLoader(MOVIES_FAVORITE_LOADER, null, this); } else { mPosition = GridView.INVALID_POSITION; MoviesSyncAdapter.syncImmediately(getActivity()); getLoaderManager().restartLoader(MOVIES_LOADER, null, this); } } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater menuInflater) { super.onCreateOptionsMenu(menu, menuInflater); menuInflater.inflate(R.menu.discoveryfragment, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.action_popular: changePrefs(getString(R.string.pref_sort_popular)); ((MainActivity) getActivity()).setActionBarTitle(getString(R.string.pref_sort_popular)); return true; case R.id.action_top_rated: changePrefs(getString(R.string.pref_sort_top_rated)); ((MainActivity) getActivity()).setActionBarTitle(getString(R.string.pref_sort_top_rated)); return true; case R.id.action_favorites: changePrefs(getString(R.string.pref_sort_favorite)); ((MainActivity) getActivity()).setActionBarTitle(getString(R.string.pref_sort_favorite)); return true; default: return super.onOptionsItemSelected(item); } } private void changePrefs(String pref_value) { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity()); SharedPreferences.Editor editor = prefs.edit(); editor.putString(getString(R.string.pref_sort_key), pref_value); editor.commit(); onSortChanged(); } @Override public void onSaveInstanceState(Bundle outState) { if (mPosition != GridView.INVALID_POSITION) { outState.putInt(SELECTED_KEY, mPosition); } super.onSaveInstanceState(outState); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { String[] projection = { MoviesEntry._ID, MoviesEntry.COLUMN_MOVIE_TITLE, MoviesEntry.COLUMN_MOVIE_SYNOPSIS, MoviesEntry.COLUMN_MOVIE_POSTER, MoviesEntry.COLUMN_MOVIE_RELEASE_DATE, MoviesEntry.COLUMN_MOVIE_USER_RATING }; CursorLoader loader = null; switch (id) { case 1: Log.v(LOG_TAG, "Loading from movies"); loader = new CursorLoader(getActivity(), MoviesEntry.CONTENT_URI, projection, null, null, null); break; case 2: Log.v(LOG_TAG, "Loading from movies favorite"); loader = new CursorLoader(getActivity(), MoviesFavoriteEntry.CONTENT_URI, projection, null, null, null); break; } return loader; } @Override public void onLoadFinished(Loader<Cursor> loader, final Cursor data) { mImageAdapter.swapCursor(data); View linearLayoutView = getActivity().findViewById(R.id.details_linear_layout); if (mTwoPane) { if (mPosition != GridView.INVALID_POSITION) { mMoviesGridView.smoothScrollToPosition(mPosition); } else if (data.moveToFirst()) { new Handler().post(new Runnable() { @Override public void run() { ((DetailsFragment.Callback) getActivity()) .onItemSelected(MoviesEntry.CONTENT_URI.buildUpon() .appendPath( data.getString(data.getColumnIndex(MoviesEntry.COLUMN_MOVIE_TITLE))) .build()); mMoviesGridView.setSelected(true); } }); } else { linearLayoutView.setVisibility(View.INVISIBLE); } } } @Override public void onLoaderReset(Loader<Cursor> loader) { mImageAdapter.swapCursor(null); } }