Java tutorial
/* * Copyright 2011 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 net.peterkuterna.android.apps.devoxxsched.ui.tablet; import net.peterkuterna.android.apps.devoxxsched.R; import net.peterkuterna.android.apps.devoxxsched.provider.CfpContract; import net.peterkuterna.android.apps.devoxxsched.ui.BaseActivity; import net.peterkuterna.android.apps.devoxxsched.ui.SessionsFragment; import net.peterkuterna.android.apps.devoxxsched.ui.TracksAdapter; import net.peterkuterna.android.apps.devoxxsched.util.ActivityHelper; import net.peterkuterna.android.apps.devoxxsched.util.UIUtils; import android.content.Intent; import android.content.res.Resources; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.os.Handler; 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.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ListPopupWindow; import android.widget.PopupWindow; import android.widget.TextView; /** * A tablet-specific fragment that is a giant {@link android.widget.Spinner} * -like widget. It shows a {@link ListPopupWindow} containing a list of tracks, * using {@link TracksAdapter}. * * Requires API level 11 or later since {@link ListPopupWindow} is API level * 11+. */ public class TracksDropdownFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor>, AdapterView.OnItemClickListener, AdapterView.OnItemSelectedListener, PopupWindow.OnDismissListener { private boolean mAutoloadTarget = true; private Cursor mCursor; private TracksAdapter mAdapter; private Uri mTracksUri; private String mNextType; private ListPopupWindow mListPopupWindow; private ViewGroup mRootView; private TextView mTitle; private TextView mAbstract; private Handler mHandler = new Handler(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mAdapter = new TracksAdapter(getActivity(), null); mAdapter.setHasAllItem(true); if (savedInstanceState != null) { // Prevent auto-load behavior on orientation change. mAutoloadTarget = false; } } public void reloadFromArguments(Bundle arguments) { if (mListPopupWindow != null) { mListPopupWindow.setAdapter(mAdapter); } getLoaderManager().initLoader(TracksAdapter.TracksQuery._TOKEN, arguments, this); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mRootView = (ViewGroup) inflater.inflate(R.layout.fragment_tracks_dropdown, null); mTitle = (TextView) mRootView.findViewById(R.id.track_title); mAbstract = (TextView) mRootView.findViewById(R.id.track_abstract); mRootView.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { mListPopupWindow = new ListPopupWindow(getActivity()); mListPopupWindow.setAdapter(mAdapter); mListPopupWindow.setModal(true); mListPopupWindow.setContentWidth(400); mListPopupWindow.setAnchorView(mRootView); mListPopupWindow.setOnItemClickListener(TracksDropdownFragment.this); mListPopupWindow.show(); mListPopupWindow.setOnDismissListener(TracksDropdownFragment.this); } }); return mRootView; } /** {@inheritDoc} */ public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectTrack(position); } @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { selectTrack(position); } protected void selectTrack(int position) { final Cursor cursor = (Cursor) mAdapter.getItem(position); loadTrack(cursor, true); if (cursor != null) { UIUtils.setLastUsedTrackID(getActivity(), cursor.getString(TracksAdapter.TracksQuery.TRACK_ID)); } else { UIUtils.setLastUsedTrackID(getActivity(), CfpContract.Tracks.ALL_TRACK_ID); } if (mListPopupWindow != null) { mListPopupWindow.dismiss(); } } @Override public void onNothingSelected(AdapterView<?> parent) { } public void loadTrack(Cursor cursor, boolean loadTargetFragment) { final Resources res = getResources(); final String trackId; final int trackColor; if (cursor != null) { trackColor = cursor.getInt(TracksAdapter.TracksQuery.TRACK_COLOR); trackId = cursor.getString(TracksAdapter.TracksQuery.TRACK_ID); if (mTitle != null) { mTitle.setText(cursor.getString(TracksAdapter.TracksQuery.TRACK_NAME)); } if (mAbstract != null) { mAbstract.setText(cursor.getString(TracksAdapter.TracksQuery.TRACK_ABSTRACT)); } } else { trackColor = res.getColor(R.color.all_track_color); trackId = CfpContract.Tracks.ALL_TRACK_ID; if (mTitle != null) { mTitle.setText(R.string.all_sessions_title); } if (mAbstract != null) { mAbstract.setText(R.string.all_sessions_subtitle); } } boolean isDark = UIUtils.isColorDark(trackColor); mRootView.setBackgroundColor(trackColor); if (isDark) { if (mTitle != null) { mTitle.setTextColor(res.getColor(R.color.body_text_1_inverse)); } if (mAbstract != null) { mAbstract.setTextColor(res.getColor(R.color.body_text_2_inverse)); } mRootView.findViewById(R.id.track_dropdown_arrow) .setBackgroundResource(R.drawable.track_dropdown_arrow_light); } else { if (mTitle != null) { mTitle.setTextColor(res.getColor(R.color.body_text_1)); } if (mAbstract != null) { mAbstract.setTextColor(res.getColor(R.color.body_text_2)); } mRootView.findViewById(R.id.track_dropdown_arrow) .setBackgroundResource(R.drawable.track_dropdown_arrow_dark); } if (loadTargetFragment) { final Intent intent = new Intent(Intent.ACTION_VIEW); final Uri trackUri = CfpContract.Tracks.buildTrackUri(trackId); intent.putExtra(SessionsFragment.EXTRA_TRACK, trackUri); if (cursor == null) { intent.setData(CfpContract.Sessions.CONTENT_URI); } else { intent.setData(CfpContract.Tracks.buildSessionsUri(trackId)); } ((BaseActivity) getSupportActivity()).openActivityOrFragment(intent); } } public void onDismiss() { mListPopupWindow = null; } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { final Intent intent = ActivityHelper.fragmentArgumentsToIntent(args); final Uri tracksUri = intent.getData(); if (tracksUri == null) { return null; } final String[] projection = TracksAdapter.TracksQuery.PROJECTION_WITH_SESSIONS_COUNT; return new CursorLoader(getActivity(), tracksUri, projection, null, null, CfpContract.Tracks.DEFAULT_SORT); } @Override public void onLoadFinished(Loader<Cursor> loader, final Cursor data) { if (getActivity() != null) { // If there was a last-opened track, load it. Otherwise load the // first // track. data.moveToFirst(); String lastTrackID = UIUtils.getLastUsedTrackID(getActivity()); if (lastTrackID != null) { while (!data.isAfterLast()) { if (lastTrackID.equals(data.getString(TracksAdapter.TracksQuery.TRACK_ID))) { break; } data.moveToNext(); } if (data.isAfterLast()) { mHandler.post(new Runnable() { @Override public void run() { loadTrack(null, mAutoloadTarget); } }); } else { mHandler.post(new Runnable() { @Override public void run() { loadTrack(data, mAutoloadTarget); } }); } } else { mHandler.post(new Runnable() { @Override public void run() { loadTrack(null, mAutoloadTarget); } }); } } mAdapter.swapCursor(data); } @Override public void onLoaderReset(Loader<Cursor> loader) { mAdapter.swapCursor(null); } }