1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.htmlviewer;
18
19import android.app.Activity;
20import android.content.Intent;
21import android.net.Uri;
22import android.os.Bundle;
23import android.util.Log;
24import android.view.Window;
25import android.webkit.CookieSyncManager;
26import android.webkit.WebChromeClient;
27import android.webkit.WebSettings;
28import android.webkit.WebView;
29
30import java.io.File;
31import java.io.FileInputStream;
32import java.io.FileNotFoundException;
33import java.io.IOException;
34import java.io.InputStream;
35
36/**
37 * Wraps a WebView widget within an Activity. When launched, it uses the
38 * URI from the intent as the URL to load into the WebView.
39 * It supports all URLs schemes that a standard WebView supports, as well as
40 * loading the top level markup using the file scheme.
41 * The WebView default settings are used with the exception of normal layout
42 * is set.
43 * This activity shows a loading progress bar in the window title and sets
44 * the window title to the title of the content.
45 *
46 */
47public class HTMLViewerActivity extends Activity {
48
49    /*
50     * The WebView that is placed in this Activity
51     */
52    private WebView mWebView;
53
54    /*
55     * As the file content is loaded completely into RAM first, set
56     * a limitation on the file size so we don't use too much RAM. If someone
57     * wants to load content that is larger than this, then a content
58     * provider should be used.
59     */
60    static final int MAXFILESIZE = 8096;
61
62    static final String LOGTAG = "HTMLViewerActivity";
63
64    @Override
65    protected void onCreate(Bundle savedInstanceState) {
66        super.onCreate(savedInstanceState);
67
68        // Call createInstance() explicitly. createInstance() is called in
69        // BrowserFrame by WebView. As it is called in WebCore thread, it can
70        // happen after onResume() is called. To use getInstance() in onResume,
71        // createInstance() needs to be called first.
72        CookieSyncManager.createInstance(this);
73
74        requestWindowFeature(Window.FEATURE_PROGRESS);
75
76        mWebView = new WebView(this);
77        setContentView(mWebView);
78
79        // Setup callback support for title and progress bar
80        mWebView.setWebChromeClient( new WebChrome() );
81
82        // Configure the webview
83        WebSettings s = mWebView.getSettings();
84        s.setUseWideViewPort(true);
85        s.setSupportZoom(true);
86        s.setBuiltInZoomControls(true);
87        s.setSavePassword(false);
88        s.setSaveFormData(false);
89        s.setBlockNetworkLoads(true);
90
91        // Javascript is purposely disabled, so that nothing can be
92        // automatically run.
93        s.setJavaScriptEnabled(false);
94
95        // Restore a webview if we are meant to restore
96        if (savedInstanceState != null) {
97            mWebView.restoreState(savedInstanceState);
98        } else {
99            // Check the intent for the content to view
100            Intent intent = getIntent();
101            if (intent.getData() != null) {
102                Uri uri = intent.getData();
103                String contentUri = "file".equals(uri.getScheme())
104                        ? FileContentProvider.BASE_URI + uri.getEncodedPath()
105                        : uri.toString();
106                String intentType = intent.getType();
107                if (intentType != null) {
108                    contentUri += "?" + intentType;
109                }
110                mWebView.loadUrl(contentUri);
111            }
112        }
113    }
114
115    @Override
116    protected void onResume() {
117        super.onResume();
118        CookieSyncManager.getInstance().startSync();
119    }
120
121    @Override
122    protected void onSaveInstanceState(Bundle outState) {
123        // the default implementation requires each view to have an id. As the
124        // browser handles the state itself and it doesn't use id for the views,
125        // don't call the default implementation. Otherwise it will trigger the
126        // warning like this, "couldn't save which view has focus because the
127        // focused view XXX has no id".
128        mWebView.saveState(outState);
129    }
130
131    @Override
132    protected void onStop() {
133        super.onStop();
134
135        CookieSyncManager.getInstance().stopSync();
136    }
137
138    @Override
139    protected void onDestroy() {
140        super.onDestroy();
141        mWebView.destroy();
142    }
143
144    class WebChrome extends WebChromeClient {
145
146        @Override
147        public void onReceivedTitle(WebView view, String title) {
148            HTMLViewerActivity.this.setTitle(title);
149        }
150
151        @Override
152        public void onProgressChanged(WebView view, int newProgress) {
153            getWindow().setFeatureInt(
154                    Window.FEATURE_PROGRESS, newProgress*100);
155            if (newProgress == 100) {
156                CookieSyncManager.getInstance().sync();
157            }
158        }
159    }
160
161}
162