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 net.abcdroid.devfest12.ui.tablet; import net.abcdroid.devfest12.provider.ScheduleContract; import net.abcdroid.devfest12.ui.BaseActivity; import net.abcdroid.devfest12.ui.MapFragment; import net.abcdroid.devfest12.ui.SessionDetailFragment; import net.abcdroid.devfest12.ui.SessionsFragment; import net.abcdroid.devfest12.ui.VendorDetailFragment; import net.abcdroid.devfest12.ui.VendorsFragment; import net.abcdroid.devfest12.R; import android.annotation.TargetApi; import android.app.FragmentBreadCrumbs; import android.content.Intent; import android.content.res.Configuration; import android.database.Cursor; import android.os.Build; import android.os.Bundle; import android.support.v4.app.FragmentManager; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.LinearLayout; /** * A multi-pane activity, where the full-screen content is a {@link MapFragment} and popup content * may be visible at any given time, containing either a {@link SessionsFragment} (representing * sessions for a given room) or a {@link SessionDetailFragment}. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB) public class MapMultiPaneActivity extends BaseActivity implements FragmentManager.OnBackStackChangedListener, MapFragment.Callbacks, SessionsFragment.Callbacks, LoaderManager.LoaderCallbacks<Cursor> { private boolean mPauseBackStackWatcher = false; private FragmentBreadCrumbs mFragmentBreadCrumbs; private String mSelectedRoomName; private MapFragment mMapFragment; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_map); FragmentManager fm = getSupportFragmentManager(); fm.addOnBackStackChangedListener(this); mFragmentBreadCrumbs = (FragmentBreadCrumbs) findViewById(R.id.breadcrumbs); mFragmentBreadCrumbs.setActivity(this); mMapFragment = (MapFragment) fm.findFragmentByTag("map"); if (mMapFragment == null) { mMapFragment = new MapFragment(); mMapFragment.setArguments(intentToFragmentArguments(getIntent())); fm.beginTransaction().add(R.id.fragment_container_map, mMapFragment, "map").commit(); } findViewById(R.id.close_button).setOnClickListener(new View.OnClickListener() { public void onClick(View view) { clearBackStack(false); } }); updateBreadCrumbs(); onConfigurationChanged(getResources().getConfiguration()); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); boolean landscape = (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE); LinearLayout spacerView = (LinearLayout) findViewById(R.id.map_detail_spacer); spacerView.setOrientation(landscape ? LinearLayout.HORIZONTAL : LinearLayout.VERTICAL); spacerView.setGravity(landscape ? Gravity.RIGHT : Gravity.BOTTOM); View popupView = findViewById(R.id.map_detail_popup); LinearLayout.LayoutParams popupLayoutParams = (LinearLayout.LayoutParams) popupView.getLayoutParams(); popupLayoutParams.width = landscape ? 0 : ViewGroup.LayoutParams.MATCH_PARENT; popupLayoutParams.height = landscape ? ViewGroup.LayoutParams.MATCH_PARENT : 0; popupView.setLayoutParams(popupLayoutParams); popupView.requestLayout(); } private void clearBackStack(boolean pauseWatcher) { if (pauseWatcher) { mPauseBackStackWatcher = true; } FragmentManager fm = getSupportFragmentManager(); while (fm.getBackStackEntryCount() > 0) { fm.popBackStackImmediate(); } if (pauseWatcher) { mPauseBackStackWatcher = false; } } public void onBackStackChanged() { if (mPauseBackStackWatcher) { return; } if (getSupportFragmentManager().getBackStackEntryCount() == 0) { showDetailPane(false); } updateBreadCrumbs(); } private void showDetailPane(boolean show) { View detailPopup = findViewById(R.id.map_detail_spacer); if (show != (detailPopup.getVisibility() == View.VISIBLE)) { detailPopup.setVisibility(show ? View.VISIBLE : View.GONE); // Pan the map left or up depending on the orientation. boolean landscape = getResources() .getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE; mMapFragment.panBy(landscape ? (show ? 0.25f : -0.25f) : 0, landscape ? 0 : (show ? 0.25f : -0.25f)); } } public void updateBreadCrumbs() { final String title = (mSelectedRoomName != null) ? mSelectedRoomName : getString(R.string.title_sessions); final String detailTitle = getString(R.string.title_session_detail); if (getSupportFragmentManager().getBackStackEntryCount() >= 2) { mFragmentBreadCrumbs.setParentTitle(title, title, mFragmentBreadCrumbsClickListener); mFragmentBreadCrumbs.setTitle(detailTitle, detailTitle); } else { mFragmentBreadCrumbs.setParentTitle(null, null, null); mFragmentBreadCrumbs.setTitle(title, title); } } private View.OnClickListener mFragmentBreadCrumbsClickListener = new View.OnClickListener() { @Override public void onClick(View view) { getSupportFragmentManager().popBackStack(); } }; @Override public void onRoomSelected(String roomId) { // Load room details mSelectedRoomName = null; Bundle loadRoomDataArgs = new Bundle(); loadRoomDataArgs.putString("room_id", roomId); getSupportLoaderManager().restartLoader(0, loadRoomDataArgs, this); // force load // Show the sessions in the room clearBackStack(true); showDetailPane(true); SessionsFragment fragment = new SessionsFragment(); fragment.setArguments(BaseActivity.intentToFragmentArguments( new Intent(Intent.ACTION_VIEW, ScheduleContract.Rooms.buildSessionsDirUri(roomId)))); getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container_detail, fragment) .addToBackStack(null).commit(); updateBreadCrumbs(); } @Override public boolean onSessionSelected(String sessionId) { // Show the session details showDetailPane(true); SessionDetailFragment fragment = new SessionDetailFragment(); Intent intent = new Intent(Intent.ACTION_VIEW, ScheduleContract.Sessions.buildSessionUri(sessionId)); intent.putExtra(SessionDetailFragment.EXTRA_VARIABLE_HEIGHT_HEADER, true); fragment.setArguments(BaseActivity.intentToFragmentArguments(intent)); getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container_detail, fragment) .addToBackStack(null).commit(); updateBreadCrumbs(); return false; } @Override public Loader<Cursor> onCreateLoader(int id, Bundle data) { return new CursorLoader(this, ScheduleContract.Rooms.buildRoomUri(data.getString("room_id")), RoomsQuery.PROJECTION, null, null, null); } @Override public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) { try { if (!cursor.moveToFirst()) { return; } mSelectedRoomName = cursor.getString(RoomsQuery.ROOM_NAME); updateBreadCrumbs(); } finally { cursor.close(); } } @Override public void onLoaderReset(Loader<Cursor> loader) { } private interface RoomsQuery { String[] PROJECTION = { ScheduleContract.Rooms.ROOM_ID, ScheduleContract.Rooms.ROOM_NAME, ScheduleContract.Rooms.ROOM_FLOOR, }; int ROOM_ID = 0; int ROOM_NAME = 1; int ROOM_FLOOR = 2; } }