Java tutorial
/* * Copyright 2012 Google Inc. * * 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.conferenceengineer.android.iosched.ui; import android.app.Activity; import android.content.Intent; import android.database.Cursor; import android.graphics.drawable.Drawable; import android.net.Uri; import android.os.Bundle; 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.text.TextUtils; import android.view.*; import android.widget.ImageView; import android.widget.TextView; import com.conferenceengineer.android.iosched.conference686.R; import com.conferenceengineer.android.iosched.provider.ScheduleContract; import com.conferenceengineer.android.iosched.util.ImageLoader; import com.conferenceengineer.android.iosched.util.UIUtils; import static com.conferenceengineer.android.iosched.util.LogUtils.LOGD; import static com.conferenceengineer.android.iosched.util.LogUtils.makeLogTag; /** * A fragment that shows detail information for a sandbox company, including * company name, description, product description, logo, etc. */ public class SandboxDetailFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> { private static final String TAG = makeLogTag(SandboxDetailFragment.class); private Uri mCompanyUri; private TextView mName; private TextView mSubtitle; private ImageView mLogo; private TextView mUrl; private TextView mDesc; private ImageLoader mImageLoader; private int mCompanyImageSize; private Drawable mCompanyPlaceHolderImage; private StringBuilder mBuffer = new StringBuilder(); private String mRoomId; private String mCompanyName; public interface Callbacks { public void onTrackIdAvailable(String trackId); } private static Callbacks sDummyCallbacks = new Callbacks() { @Override public void onTrackIdAvailable(String trackId) { } }; private Callbacks mCallbacks = sDummyCallbacks; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); final Intent intent = BaseActivity.fragmentArgumentsToIntent(getArguments()); mCompanyUri = intent.getData(); if (mCompanyUri == null) { return; } mCompanyImageSize = getResources().getDimensionPixelSize(R.dimen.sandbox_company_image_size); mCompanyPlaceHolderImage = getResources().getDrawable(R.drawable.sandbox_logo_empty); setHasOptionsMenu(true); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); if (mCompanyUri == null) { return; } if (getActivity() instanceof ImageLoader.ImageLoaderProvider) { mImageLoader = ((ImageLoader.ImageLoaderProvider) getActivity()).getImageLoaderInstance(); } // Start background query to load sandbox company details getLoaderManager().initLoader(SandboxQuery._TOKEN, null, this); } @Override public void onAttach(Activity activity) { super.onAttach(activity); if (!(activity instanceof Callbacks)) { throw new ClassCastException("Activity must implement fragment's callbacks."); } mCallbacks = (Callbacks) activity; } @Override public void onDetach() { super.onDetach(); mCallbacks = sDummyCallbacks; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_sandbox_detail, null); mName = (TextView) rootView.findViewById(R.id.company_name); mLogo = (ImageView) rootView.findViewById(R.id.company_logo); mUrl = (TextView) rootView.findViewById(R.id.company_url); mDesc = (TextView) rootView.findViewById(R.id.company_desc); mSubtitle = (TextView) rootView.findViewById(R.id.company_subtitle); return rootView; } void buildUiFromCursor(Cursor cursor) { if (getActivity() == null) { return; } if (!cursor.moveToFirst()) { return; } mCompanyName = cursor.getString(SandboxQuery.NAME); mName.setText(mCompanyName); // Start background fetch to load company logo final String logoUrl = cursor.getString(SandboxQuery.LOGO_URL); if (!TextUtils.isEmpty(logoUrl) && mImageLoader != null) { mImageLoader.get(UIUtils.getConferenceImageUrl(logoUrl), mLogo, mCompanyPlaceHolderImage, mCompanyImageSize, mCompanyImageSize); mLogo.setVisibility(View.VISIBLE); } else { mLogo.setVisibility(View.GONE); } mRoomId = cursor.getString(SandboxQuery.ROOM_ID); // Set subtitle: time and room long blockStart = cursor.getLong(SandboxQuery.BLOCK_START); long blockEnd = cursor.getLong(SandboxQuery.BLOCK_END); String roomName = cursor.getString(SandboxQuery.ROOM_NAME); final String subtitle = UIUtils.formatSessionSubtitle("Sandbox", blockStart, blockEnd, roomName, mBuffer, getActivity()); mSubtitle.setText(subtitle); mUrl.setText(cursor.getString(SandboxQuery.URL)); mDesc.setText(cursor.getString(SandboxQuery.DESC)); String trackId = cursor.getString(SandboxQuery.TRACK_ID); LOGD("Tracker", "Sandbox Company: " + mCompanyName); mCallbacks.onTrackIdAvailable(trackId); } /** * {@link com.conferenceengineer.android.iosched.provider.ScheduleContract.Sandbox} * query parameters. */ private interface SandboxQuery { int _TOKEN = 0x4; String[] PROJECTION = { ScheduleContract.Sandbox.COMPANY_NAME, ScheduleContract.Sandbox.COMPANY_DESC, ScheduleContract.Sandbox.COMPANY_URL, ScheduleContract.Sandbox.COMPANY_LOGO_URL, ScheduleContract.Sandbox.TRACK_ID, ScheduleContract.Sandbox.BLOCK_START, ScheduleContract.Sandbox.BLOCK_END, ScheduleContract.Sandbox.ROOM_NAME, ScheduleContract.Sandbox.ROOM_ID }; int NAME = 0; int DESC = 1; int URL = 2; int LOGO_URL = 3; int TRACK_ID = 4; int BLOCK_START = 5; int BLOCK_END = 6; int ROOM_NAME = 7; int ROOM_ID = 8; } @Override public Loader<Cursor> onCreateLoader(int id, Bundle data) { return new CursorLoader(getActivity(), mCompanyUri, SandboxQuery.PROJECTION, null, null, null); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { buildUiFromCursor(cursor); } @Override public void onLoaderReset(Loader<Cursor> loader) { } }