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.data.DatabaseContract; import com.fbartnitzek.tasteemall.data.QueryColumns; import com.fbartnitzek.tasteemall.data.pojo.Producer; import com.fbartnitzek.tasteemall.showentry.ShowProducerActivity; 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 ProducerPagerFragment extends BasePagerFragment implements LoaderManager.LoaderCallbacks<Cursor> { private static final String LOG_TAG = ProducerPagerFragment.class.getName(); private static final int PRODUCER_LOADER_ID = 300; private ProducerAdapter mProducerAdapter; private TextView mProducerHeading; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.entity = Producer.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 + "]"); mProducerAdapter = new ProducerAdapter(new ProducerAdapter.ProducerAdapterClickHandler() { @Override public void onClick(String producerName, Uri contentUri, ProducerAdapter.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.nameView, vh.nameView.getTransitionName())) .toBundle(); } Intent intent = new Intent(getActivity(), ShowProducerActivity.class).setData(contentUri); startActivity(intent, bundle); } }, getActivity()); mProducerHeading = (TextView) mRootView.findViewById(R.id.heading_entities); mProducerHeading .setText(getString(R.string.label_list_entries_preview, getString(R.string.label_producers))); RecyclerView reviewRecyclerView = (RecyclerView) mRootView.findViewById(R.id.recyclerview_entities); reviewRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); reviewRecyclerView.setAdapter(mProducerAdapter); return mRootView; } @Override public int getSharedTransitionId() { return R.string.shared_transition_add_drink_name; } @Override public void restartLoader() { getLoaderManager().restartLoader(PRODUCER_LOADER_ID, null, this); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { switch (id) { case PRODUCER_LOADER_ID: if (this.jsonUri == null) { Log.v(LOG_TAG, "onCreateLoader before jsonCreation, hashCode=" + this.hashCode() + ", " + "id = [" + id + "], args = [" + args + "]"); String pattern = ((MainActivity) getActivity()).getSearchPattern(); try { String encodedValue = DatabaseContract.encodeValue(pattern); if (jsonTextFilter == null) { jsonTextFilter = new JSONObject().put(Producer.ENTITY, new JSONObject().put(DatabaseContract.OR, new JSONObject().put(Producer.ENTITY, new JSONObject().put(Producer.NAME, new JSONObject()) .put(Producer.FORMATTED_ADDRESS, new JSONObject()) .put(Producer.COUNTRY, new JSONObject())))); } JSONObject producer = jsonTextFilter.getJSONObject(Producer.ENTITY) .getJSONObject(DatabaseContract.OR).getJSONObject(Producer.ENTITY); producer.getJSONObject(Producer.NAME).put(DatabaseContract.Operations.CONTAINS, encodedValue); producer.getJSONObject(Producer.FORMATTED_ADDRESS).put(DatabaseContract.Operations.CONTAINS, encodedValue); producer.getJSONObject(Producer.COUNTRY).put(DatabaseContract.Operations.CONTAINS, encodedValue); jsonTextFilter.getJSONObject(Producer.ENTITY).getJSONObject(DatabaseContract.OR) .put(Producer.ENTITY, producer); jsonUri = DatabaseContract.buildUriWithJson(jsonTextFilter); } catch (JSONException | UnsupportedEncodingException e) { e.printStackTrace(); Log.e(LOG_TAG, "onCreateLoader building jsonUri failed, hashCode=" + this.hashCode() + ", " + "pattern= [" + pattern + "]"); throw new RuntimeException("building jsonUri failed"); } Log.v(LOG_TAG, "onCreateLoader after jsonCreation, hashCode=" + this.hashCode() + ", " + "id = [" + id + "], args = [" + args + "]"); } return new CursorLoader(getActivity(), jsonUri, QueryColumns.MainFragment.ProducerQuery.COLUMNS, null, null, Producer.NAME); default: throw new RuntimeException("wrong loader_id in " + this.getClass().getSimpleName() + "..."); } } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { String numberAppendix = data == null ? "" : getString(R.string.label_numberAppendix, data.getCount()); switch (loader.getId()) { case PRODUCER_LOADER_ID: mProducerAdapter.swapCursor(data); mProducerHeading.setText( getString(R.string.label_list_entries, getString(R.string.label_producers), numberAppendix)); break; } } @Override public void onLoaderReset(Loader<Cursor> loader) { switch (loader.getId()) { case PRODUCER_LOADER_ID: mProducerAdapter.swapCursor(null); break; } } }