Java tutorial
package com.fbartnitzek.tasteemall.mainpager; import android.app.ActivityOptions; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.util.Pair; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import com.fbartnitzek.tasteemall.MainActivity; import com.fbartnitzek.tasteemall.R; import com.fbartnitzek.tasteemall.Utils; import com.fbartnitzek.tasteemall.data.DatabaseContract; import com.fbartnitzek.tasteemall.data.QueryColumns; import com.fbartnitzek.tasteemall.data.pojo.Drink; import com.fbartnitzek.tasteemall.data.pojo.Producer; import com.fbartnitzek.tasteemall.showentry.ShowDrinkActivity; import org.json.JSONException; import org.json.JSONObject; import java.io.UnsupportedEncodingException; /** * Copyright 2016. Frank Bartnitzek * * 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. */ public class DrinkPagerFragment extends BasePagerFragment implements LoaderManager.LoaderCallbacks<Cursor> { private static final int DRINK_LOADER_ID = 400; private static final String LOG_TAG = DrinkPagerFragment.class.getName(); private DrinkAdapter mDrinkAdapter; private TextView mDrinksHeading; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.entity = Drink.ENTITY; } @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { super.onCreateView(inflater, container, savedInstanceState); Log.v(LOG_TAG, "onCreateView, hashCode=" + this.hashCode() + ", " + "inflater = [" + inflater + "], container = [" + container + "], savedInstanceState = [" + savedInstanceState + "]"); mDrinkAdapter = new DrinkAdapter(new DrinkAdapter.DrinkAdapterClickHandler() { @Override public void onClick(String drinkName, Uri contentUri, DrinkAdapter.ViewHolder vh) { Bundle bundle = null; if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) { bundle = ActivityOptions.makeSceneTransitionAnimation(getActivity(), new Pair<View, String>(vh.drinkNameView, vh.drinkNameView.getTransitionName()), new Pair<View, String>(vh.producerNameView, vh.producerNameView.getTransitionName())) .toBundle(); } Intent intent = new Intent(getActivity(), ShowDrinkActivity.class).setData(contentUri); startActivity(intent, bundle); } }, getActivity()); mDrinksHeading = (TextView) mRootView.findViewById(R.id.heading_entities); mDrinksHeading.setText(getString(R.string.label_list_entries_preview, getString(R.string.label_drinks))); RecyclerView reviewRecyclerView = (RecyclerView) mRootView.findViewById(R.id.recyclerview_entities); reviewRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); reviewRecyclerView.setAdapter(mDrinkAdapter); return mRootView; } @Override public void restartLoader() { getLoaderManager().restartLoader(DRINK_LOADER_ID, null, this); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { Log.v(LOG_TAG, "onCreateLoader, hashCode=" + this.hashCode() + ", " + "id = [" + id + "], args = [" + args + "]"); switch (id) { case DRINK_LOADER_ID: String pattern = ((MainActivity) getActivity()).getSearchPattern(); String drinkType = Utils.getDrinkTypeFromSharedPrefs(getActivity(), true); if (jsonUri == null) { // private static final String DRINKS_OR_PRODUCERS_BY_NAME_AND_TYPE_SELECTION = // "(" + DA + "." + Drink.NAME + " LIKE ? OR " + PA + "." + Producer.NAME + " LIKE ?)" + // " AND " + DA + "." + Drink.TYPE + " = ?"; // TODO: performance of static jsonObject...? Log.v(LOG_TAG, "onCreateLoader before jsonCreation, hashCode=" + this.hashCode() + ", " + "id = [" + id + "], args = [" + args + "]"); try { String encodedValue = DatabaseContract.encodeValue(pattern); if (jsonTextFilter == null) { //reuse it every time jsonTextFilter = new JSONObject().put(Drink.ENTITY, new JSONObject().put(DatabaseContract.OR, new JSONObject().put(Drink.ENTITY, new JSONObject().put(Drink.NAME, new JSONObject()).put( Producer.ENTITY, new JSONObject().put(Producer.NAME, new JSONObject()))))); } jsonTextFilter.getJSONObject(Drink.ENTITY).getJSONObject(DatabaseContract.OR) .getJSONObject(Drink.ENTITY).getJSONObject(Drink.NAME) .put(DatabaseContract.Operations.CONTAINS, encodedValue); jsonTextFilter.getJSONObject(Drink.ENTITY).getJSONObject(DatabaseContract.OR) .getJSONObject(Drink.ENTITY).getJSONObject(Producer.ENTITY).getJSONObject(Producer.NAME) .put(DatabaseContract.Operations.CONTAINS, encodedValue); if (Drink.TYPE_ALL.equals(drinkType)) { jsonTextFilter.getJSONObject(Drink.ENTITY).remove(Drink.TYPE); } else { jsonTextFilter.getJSONObject(Drink.ENTITY).put(Drink.TYPE, new JSONObject() .put(DatabaseContract.Operations.IS, DatabaseContract.encodeValue(drinkType))); } jsonUri = DatabaseContract.buildUriWithJson(jsonTextFilter); Log.v(LOG_TAG, "onCreateLoader after jsonCreation, hashCode=" + this.hashCode() + ", " + "id = [" + id + "], args = [" + args + "]"); } catch (JSONException | UnsupportedEncodingException e) { e.printStackTrace(); Log.e(LOG_TAG, "onCreateLoader building jsonUri failed, hashCode=" + this.hashCode() + ", " + "pattern= [" + pattern + "], drinkType= [" + drinkType + "]"); throw new RuntimeException("building jsonUri failed"); } } return new CursorLoader(getActivity(), jsonUri, QueryColumns.MainFragment.DrinkWithProducerQuery.COLUMNS, null, null, DatabaseContract.ProducerEntry.ALIAS + "." + Producer.NAME + ", " + DatabaseContract.DrinkEntry.ALIAS + "." + Drink.NAME); default: throw new RuntimeException("wrong loader_id in DrinkPagerFragment..."); } } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { // Log.v(LOG_TAG, "onLoadFinished, hashCode=" + this.hashCode() + ", " + "loader = [" + loader + "], data = [" + data + "]"); String numberAppendix = data == null ? "" : getString(R.string.label_numberAppendix, data.getCount()); switch (loader.getId()) { case DRINK_LOADER_ID: mDrinkAdapter.swapCursor(data); mDrinksHeading.setText( getString(R.string.label_list_entries, getString(R.string.label_drinks), numberAppendix)); break; } } @Override public void onLoaderReset(Loader<Cursor> loader) { switch (loader.getId()) { case DRINK_LOADER_ID: mDrinkAdapter.swapCursor(null); break; } } @Override public int getSharedTransitionId() { return R.string.shared_transition_add_drink_name; } }