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 com.google.android.apps.iosched.ui; import android.content.Intent; import android.graphics.Bitmap; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.Fragment; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.webkit.WebChromeClient; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.Toast; import com.google.android.apps.iosched.provider.ScheduleContract; import com.google.android.apps.iosched.provider.ScheduleContract.Rooms; import com.google.android.apps.iosched.util.AnalyticsUtils; import com.google.android.apps.iosched.util.ParserUtils; import com.novoda.droidcon2011.R; /** * Shows a {@link WebView} with a map of the conference venue. */ public class MapFragment extends Fragment { private static final String TAG = "MapFragment"; /** * When specified, will automatically point the map to the requested room. */ public static final String EXTRA_ROOM = "com.google.android.iosched.extra.ROOM"; private static final String MAP_JSI_NAME = "MAP_CONTAINER"; private static final String MAP_URL = "http://maps.google.co.uk/maps/ms?ie=UTF8&hl=en&num=10&msa=0&msid=111268683924396905734.000490c793a5b883cd911&ll=51.533516,-0.105298&spn=0.001949,0.004817&output=embed"; private static boolean CLEAR_CACHE_ON_LOAD = false; private WebView mWebView; private View mLoadingSpinner; private boolean mMapInitialized = false; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); AnalyticsUtils.getInstance(getActivity()).trackPageView("/Map"); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { ViewGroup root = (ViewGroup) inflater.inflate(R.layout.fragment_webview_with_spinner, null); // For some reason, if we omit this, NoSaveStateFrameLayout thinks we are // FILL_PARENT / WRAP_CONTENT, making the progress bar stick to the top of the activity. root.setLayoutParams( new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT)); mLoadingSpinner = root.findViewById(R.id.loading_spinner); mWebView = (WebView) root.findViewById(R.id.webview); mWebView.setWebChromeClient(mWebChromeClient); mWebView.setWebViewClient(mWebViewClient); mWebView.post(new Runnable() { public void run() { // Initialize web view if (CLEAR_CACHE_ON_LOAD) { mWebView.clearCache(true); } mWebView.getSettings().setJavaScriptEnabled(true); mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(false); mWebView.loadUrl(MAP_URL); mWebView.addJavascriptInterface(mMapJsiImpl, MAP_JSI_NAME); } }); return root; } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); inflater.inflate(R.menu.refresh_menu_items, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == R.id.menu_refresh) { mWebView.reload(); return true; } return super.onOptionsItemSelected(item); } private void runJs(String js) { if (Log.isLoggable(TAG, Log.DEBUG)) { Log.d(TAG, "Loading javascript:" + js); } mWebView.loadUrl("javascript:" + js); } /** * Helper method to escape JavaScript strings. Useful when passing strings to a WebView via * "javascript:" calls. */ private static String escapeJsString(String s) { if (s == null) { return ""; } return s.replace("'", "\\'").replace("\"", "\\\""); } public void panLeft(float screenFraction) { runJs("IoMap.panLeft('" + screenFraction + "');"); } /** * I/O Conference Map JavaScript interface. */ private interface MapJsi { void openContentInfo(String test); void onMapReady(); } private WebChromeClient mWebChromeClient = new WebChromeClient() { public void onConsoleMessage(String message, int lineNumber, String sourceID) { Log.i(TAG, "JS Console message: (" + sourceID + ": " + lineNumber + ") " + message); } }; private WebViewClient mWebViewClient = new WebViewClient() { @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { super.onPageStarted(view, url, favicon); mLoadingSpinner.setVisibility(View.VISIBLE); mWebView.setVisibility(View.INVISIBLE); } @Override public void onPageFinished(WebView view, String url) { super.onPageFinished(view, url); mLoadingSpinner.setVisibility(View.GONE); mWebView.setVisibility(View.VISIBLE); } @Override public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { Log.e(TAG, "Error " + errorCode + ": " + description); Toast.makeText(view.getContext(), "Error " + errorCode + ": " + description, Toast.LENGTH_LONG).show(); super.onReceivedError(view, errorCode, description, failingUrl); } }; private MapJsi mMapJsiImpl = new MapJsi() { public void openContentInfo(String roomId) { final String possibleTrackId = ParserUtils.translateTrackIdAlias(roomId); final Intent intent; if (ParserUtils.LOCAL_TRACK_IDS.contains(possibleTrackId)) { // This is a track; open up the sandbox for the track, since room IDs that are // track IDs are sandbox areas in the map. Uri trackVendorsUri = ScheduleContract.Tracks.buildVendorsUri(possibleTrackId); intent = new Intent(Intent.ACTION_VIEW, trackVendorsUri); } else { Uri roomUri = Rooms.buildSessionsDirUri(roomId); intent = new Intent(Intent.ACTION_VIEW, roomUri); } getActivity().runOnUiThread(new Runnable() { public void run() { ((BaseActivity) getActivity()).openActivityOrFragment(intent); } }); } public void onMapReady() { if (Log.isLoggable(TAG, Log.DEBUG)) { Log.d(TAG, "onMapReady"); } final Intent intent = BaseActivity.fragmentArgumentsToIntent(getArguments()); String showRoomId = null; if (!mMapInitialized && intent.hasExtra(EXTRA_ROOM)) { showRoomId = intent.getStringExtra(EXTRA_ROOM); } if (showRoomId != null) { runJs("IoMap.showLocationById('" + escapeJsString(showRoomId) + "');"); } mMapInitialized = true; } }; }