Java tutorial
/* * Copyright (C) 2014 Michell Bak * * 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.miz.mizuu.fragments; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.content.SharedPreferences.OnSharedPreferenceChangeListener; import android.database.Cursor; import android.graphics.Bitmap.Config; import android.net.Uri; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.support.v4.content.LocalBroadcastManager; import android.text.TextUtils; 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.view.ViewTreeObserver; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.TextView; import com.miz.db.DatabaseHelper; import com.miz.db.DbAdapterMovies; import com.miz.functions.AsyncTask; import com.miz.functions.ColumnIndexCache; import com.miz.functions.CoverItem; import com.miz.functions.LibrarySectionAsyncTask; import com.miz.functions.MediumMovie; import com.miz.functions.MizLib; import com.miz.functions.SQLiteCursorLoader; import com.miz.mizuu.MizuuApplication; import com.miz.mizuu.MovieDetails; import com.miz.mizuu.R; import com.miz.utils.LocalBroadcastUtils; import com.miz.utils.TypefaceUtils; import com.squareup.picasso.Picasso; import java.util.ArrayList; import java.util.Random; import static com.miz.functions.PreferenceKeys.GRID_ITEM_SIZE; import static com.miz.functions.PreferenceKeys.SHOW_TITLES_IN_GRID; public class CollectionLibraryFragment extends Fragment implements OnSharedPreferenceChangeListener { private SharedPreferences mSharedPreferences; private int mImageThumbSize, mImageThumbSpacing, mResizedWidth, mResizedHeight, mCurrentSort; private LoaderAdapter mAdapter; private ArrayList<MediumMovie> mMovies = new ArrayList<MediumMovie>(); private ArrayList<Integer> mMovieKeys = new ArrayList<Integer>(); private GridView mGridView = null; private ProgressBar mProgressBar; private boolean mLoading, mShowTitles; private Picasso mPicasso; private Config mConfig; private MovieSectionLoader mMovieSectionLoader; private String mCollectionId; /** * Empty constructor as per the Fragment documentation */ public CollectionLibraryFragment() { } public static CollectionLibraryFragment newInstance(String collectionId, String collectionTitle) { CollectionLibraryFragment frag = new CollectionLibraryFragment(); Bundle b = new Bundle(); b.putString("collectionId", collectionId); b.putString("collectionTitle", collectionTitle); frag.setArguments(b); return frag; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mCollectionId = getArguments().getString("collectionId", ""); if (TextUtils.isEmpty(mCollectionId)) { getActivity().finish(); return; } setRetainInstance(true); setHasOptionsMenu(true); // Set OnSharedPreferenceChange listener PreferenceManager.getDefaultSharedPreferences(getActivity()).registerOnSharedPreferenceChangeListener(this); // Initialize the PreferenceManager variable and preference variable(s) mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity()); mShowTitles = mSharedPreferences.getBoolean(SHOW_TITLES_IN_GRID, true); String thumbnailSize = mSharedPreferences.getString(GRID_ITEM_SIZE, getString(R.string.normal)); if (thumbnailSize.equals(getString(R.string.large))) mImageThumbSize = (int) (getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size) * 1.33); else if (thumbnailSize.equals(getString(R.string.normal))) mImageThumbSize = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size) * 1; else mImageThumbSize = (int) (getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size) * 0.75); mImageThumbSpacing = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_spacing); mPicasso = MizuuApplication.getPicasso(getActivity()); mConfig = MizuuApplication.getBitmapConfig(); mAdapter = new LoaderAdapter(getActivity()); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); LocalBroadcastManager.getInstance(getActivity()).registerReceiver(mMessageReceiver, new IntentFilter(LocalBroadcastUtils.UPDATE_MOVIE_LIBRARY)); } private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { clearCaches(); forceLoaderLoad(); } }; LoaderCallbacks<Cursor> loaderCallbacks = new LoaderCallbacks<Cursor>() { @Override public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) { mLoading = true; return new SQLiteCursorLoader(getActivity(), DatabaseHelper.getHelper(getActivity()).getWritableDatabase(), DbAdapterMovies.DATABASE_TABLE, DbAdapterMovies.SELECT_ALL, DbAdapterMovies.KEY_COLLECTION_ID + " = '" + mCollectionId + "'", null, null, null, null); } @Override public void onLoadFinished(Loader<Cursor> arg0, final Cursor cursor) { new AsyncTask<Void, Void, Void>() { @Override protected void onPreExecute() { mMovies.clear(); mMovieKeys.clear(); } @Override protected Void doInBackground(Void... params) { ColumnIndexCache cache = new ColumnIndexCache(); try { while (cursor.moveToNext()) { mMovies.add(new MediumMovie(getActivity(), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_TITLE)), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_TMDB_ID)), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_RATING)), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_RELEASEDATE)), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_GENRES)), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_FAVOURITE)), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_ACTORS)), MizuuApplication.getCollectionsAdapter() .getCollection(cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_COLLECTION_ID))), cursor.getString( cache.getColumnIndex(cursor, DbAdapterMovies.KEY_COLLECTION_ID)), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_TO_WATCH)), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_HAS_WATCHED)), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_DATE_ADDED)), cursor.getString( cache.getColumnIndex(cursor, DbAdapterMovies.KEY_CERTIFICATION)), cursor.getString(cache.getColumnIndex(cursor, DbAdapterMovies.KEY_RUNTIME)))); } } catch (Exception e) { } finally { cursor.close(); cache.clear(); } for (int i = 0; i < mMovies.size(); i++) mMovieKeys.add(i); return null; } @Override protected void onPostExecute(Void result) { showMovieSection(0); mLoading = false; } }.execute(); } @Override public void onLoaderReset(Loader<Cursor> arg0) { mMovies.clear(); mMovieKeys.clear(); notifyDataSetChanged(); } }; private void clearCaches() { if (isAdded()) MizuuApplication.clearPicassoCache(getActivity()); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.image_grid_fragment, container, false); } @Override public void onViewCreated(View v, Bundle savedInstanceState) { super.onViewCreated(v, savedInstanceState); mProgressBar = (ProgressBar) v.findViewById(R.id.progress); if (mMovieKeys.size() > 0) mProgressBar.setVisibility(View.GONE); mAdapter = new LoaderAdapter(getActivity()); mGridView = (GridView) v.findViewById(R.id.gridView); mGridView.setAdapter(mAdapter); mGridView.setColumnWidth(mImageThumbSize); // Calculate the total column width to set item heights by factor 1.5 mGridView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { if (mAdapter.getNumColumns() == 0) { final int numColumns = (int) Math .floor(mGridView.getWidth() / (mImageThumbSize + mImageThumbSpacing)); if (numColumns > 0) { mAdapter.setNumColumns(numColumns); mResizedWidth = (int) (((mGridView.getWidth() - (numColumns * mImageThumbSpacing)) / numColumns) * 1.1); // * 1.1 is a hack to make images look slightly less blurry mResizedHeight = (int) (mResizedWidth * 1.5); } MizLib.removeViewTreeObserver(mGridView.getViewTreeObserver(), this); } } }); mGridView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { showDetails(arg2); } }); } private void showDetails(int arg2) { Intent intent = new Intent(); intent.putExtra("tmdbId", mMovies.get(mMovieKeys.get(arg2)).getTmdbId()); intent.setClass(getActivity(), MovieDetails.class); startActivityForResult(intent, 0); } @Override public void onResume() { super.onResume(); if (mMovies.size() == 0) forceLoaderLoad(); notifyDataSetChanged(); } @Override public void onDestroy() { // Unregister since the activity is about to be closed. LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(mMessageReceiver); PreferenceManager.getDefaultSharedPreferences(getActivity()) .unregisterOnSharedPreferenceChangeListener(this); super.onDestroy(); } private class LoaderAdapter extends BaseAdapter { private LayoutInflater mInflater; private final Context mContext; private int mNumColumns = 0; private ArrayList<Integer> mMovieKeys = new ArrayList<Integer>(); private ArrayList<MediumMovie> mMovies = new ArrayList<MediumMovie>(); public LoaderAdapter(Context context) { mContext = context; mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } // This is necessary in order to avoid random ArrayOutOfBoundsException when changing the items (i.e. during a library update) public void setItems(ArrayList<Integer> movieKeys, ArrayList<MediumMovie> movies) { mMovieKeys = new ArrayList<Integer>(movieKeys); mMovies = new ArrayList<MediumMovie>(movies); notifyDataSetChanged(); } @Override public boolean isEmpty() { return (!mLoading && mMovieKeys.size() == 0); } @Override public int getCount() { return mMovieKeys.size(); } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup container) { final MediumMovie mMovie = mMovies.get(mMovieKeys.get(position)); CoverItem holder; if (convertView == null) { convertView = mInflater.inflate(R.layout.grid_cover_two_line, container, false); holder = new CoverItem(); holder.cover = (ImageView) convertView.findViewById(R.id.cover); holder.text = (TextView) convertView.findViewById(R.id.text); holder.text.setSingleLine(true); holder.subtext = (TextView) convertView.findViewById(R.id.sub_text); holder.subtext.setSingleLine(true); holder.text.setTypeface(TypefaceUtils.getRobotoMedium(mContext)); convertView.setTag(holder); } else { holder = (CoverItem) convertView.getTag(); } if (!mShowTitles) { holder.text.setVisibility(View.GONE); holder.subtext.setVisibility(View.GONE); } else { holder.text.setVisibility(View.VISIBLE); holder.subtext.setVisibility(View.VISIBLE); holder.text.setText(mMovie.getTitle()); holder.subtext.setText(mMovie.getSubText(mCurrentSort)); } holder.cover.setImageResource(R.color.card_background_dark); if (mResizedWidth > 0) mPicasso.load(mMovie.getThumbnail()).resize(mResizedWidth, mResizedHeight).config(mConfig) .into(holder); else mPicasso.load(mMovie.getThumbnail()).config(mConfig).into(holder); return convertView; } public void setNumColumns(int numColumns) { mNumColumns = numColumns; } public int getNumColumns() { return mNumColumns; } } private void notifyDataSetChanged() { if (mAdapter != null) mAdapter.setItems(mMovieKeys, mMovies); } private class MovieSectionLoader extends LibrarySectionAsyncTask<Void, Void, Boolean> { private int mPosition; private ArrayList<Integer> mTempKeys = new ArrayList<Integer>(); public MovieSectionLoader(int position) { mPosition = position; } @Override protected void onPreExecute() { setProgressBarVisible(true); mMovieKeys.clear(); } @Override protected Boolean doInBackground(Void... params) { if (isCancelled()) return false; switch (mPosition) { case 0: for (int i = 0; i < mMovies.size(); i++) mTempKeys.add(i); break; } return true; } @Override protected void onPostExecute(Boolean success) { // Make sure that the loading was successful, that the Fragment is still added and // that the currently selected navigation index is the same as when we started loading if (success && isAdded()) { mMovieKeys.addAll(mTempKeys); notifyDataSetChanged(); setProgressBarVisible(false); } } } private void showMovieSection(int position) { if (mMovieSectionLoader != null) mMovieSectionLoader.cancel(true); mMovieSectionLoader = new MovieSectionLoader(position); mMovieSectionLoader.execute(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); inflater.inflate(R.menu.menu, menu); menu.removeItem(R.id.update); menu.removeItem(R.id.search_textbox); menu.removeItem(R.id.filters); menu.removeItem(R.id.sort); menu.removeItem(R.id.unidentifiedFiles); menu.findItem(R.id.view_collection_online).setVisible(true); } @Override public boolean onOptionsItemSelected(MenuItem item) { super.onOptionsItemSelected(item); switch (item.getItemId()) { case R.id.random: if (mMovieKeys.size() > 0) { int random = new Random().nextInt(mMovieKeys.size()); showDetails(random); } break; case R.id.view_collection_online: Intent i = new Intent(Intent.ACTION_VIEW); i.setData(Uri.parse("http://www.themoviedb.org/collection/" + mCollectionId)); startActivity(i); break; } return true; } private void setProgressBarVisible(boolean visible) { mProgressBar.setVisibility(visible ? View.VISIBLE : View.GONE); mGridView.setVisibility(visible ? View.GONE : View.VISIBLE); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == 1) { // Update forceLoaderLoad(); } else if (resultCode == 3) { notifyDataSetChanged(); } } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { if (key.equals(GRID_ITEM_SIZE)) { String thumbnailSize = mSharedPreferences.getString(GRID_ITEM_SIZE, getString(R.string.normal)); if (thumbnailSize.equals(getString(R.string.large))) mImageThumbSize = (int) (getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size) * 1.33); else if (thumbnailSize.equals(getString(R.string.normal))) mImageThumbSize = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size) * 1; else mImageThumbSize = (int) (getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size) * 0.75); mGridView.setColumnWidth(mImageThumbSize); final int numColumns = (int) Math.floor(mGridView.getWidth() / (mImageThumbSize + mImageThumbSpacing)); if (numColumns > 0) { mAdapter.setNumColumns(numColumns); } notifyDataSetChanged(); } else if (key.equals(SHOW_TITLES_IN_GRID)) { mShowTitles = sharedPreferences.getBoolean(SHOW_TITLES_IN_GRID, true); notifyDataSetChanged(); } } private void forceLoaderLoad() { if (isAdded()) if (getLoaderManager().getLoader(0) == null) { getLoaderManager().initLoader(0, null, loaderCallbacks); } else { getLoaderManager().restartLoader(0, null, loaderCallbacks); } } }