JsDialogHelper.java revision 451e338c51e8c45efc0d21536dfae6f78f6d5e06 
1/*
2 * Copyright (C) 2013 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 android.webkit;
18
19import android.annotation.SystemApi;
20import android.app.Activity;
21import android.app.AlertDialog;
22import android.content.Context;
23import android.content.DialogInterface;
24import android.os.Message;
25import android.util.Log;
26import android.view.LayoutInflater;
27import android.view.View;
28import android.widget.EditText;
29import android.widget.TextView;
30
31import java.net.MalformedURLException;
32import java.net.URL;
33
34/**
35 * Helper class to create JavaScript dialogs. It is used by
36 * different WebView implementations.
37 *
38 * @hide
39 */
40@SystemApi
41public class JsDialogHelper {
42
43    private static final String TAG = "JsDialogHelper";
44
45    // Dialog types
46    public static final int ALERT   = 1;
47    public static final int CONFIRM = 2;
48    public static final int PROMPT  = 3;
49    public static final int UNLOAD  = 4;
50
51    private final String mDefaultValue;
52    private final JsPromptResult mResult;
53    private final String mMessage;
54    private final int mType;
55    private final String mUrl;
56
57    public JsDialogHelper(JsPromptResult result, int type, String defaultValue, String message,
58            String url) {
59        mResult = result;
60        mDefaultValue = defaultValue;
61        mMessage = message;
62        mType = type;
63        mUrl = url;
64    }
65
66    public JsDialogHelper(JsPromptResult result, Message msg) {
67        mResult = result;
68        mDefaultValue = msg.getData().getString("default");
69        mMessage = msg.getData().getString("message");
70        mType = msg.getData().getInt("type");
71        mUrl = msg.getData().getString("url");
72    }
73
74    public boolean invokeCallback(WebChromeClient client, WebView webView) {
75        switch (mType) {
76            case ALERT:
77                return client.onJsAlert(webView, mUrl, mMessage, mResult);
78            case CONFIRM:
79                return client.onJsConfirm(webView, mUrl, mMessage, mResult);
80            case UNLOAD:
81                return client.onJsBeforeUnload(webView, mUrl, mMessage, mResult);
82            case PROMPT:
83                return client.onJsPrompt(webView, mUrl, mMessage, mDefaultValue, mResult);
84            default:
85                throw new IllegalArgumentException("Unexpected type: " + mType);
86        }
87    }
88
89    public void showDialog(Context context) {
90        if (!canShowAlertDialog(context)) {
91            Log.w(TAG, "Cannot create a dialog, the WebView context is not an Activity");
92            mResult.cancel();
93            return;
94        }
95
96        String title, displayMessage;
97        int positiveTextId, negativeTextId;
98        if (mType == UNLOAD) {
99            title = context.getString(com.android.internal.R.string.js_dialog_before_unload_title);
100            displayMessage = context.getString(
101                    com.android.internal.R.string.js_dialog_before_unload, mMessage);
102            positiveTextId = com.android.internal.R.string.js_dialog_before_unload_positive_button;
103            negativeTextId = com.android.internal.R.string.js_dialog_before_unload_negative_button;
104        } else {
105            title = getJsDialogTitle(context);
106            displayMessage = mMessage;
107            positiveTextId = com.android.internal.R.string.ok;
108            negativeTextId = com.android.internal.R.string.cancel;
109        }
110        AlertDialog.Builder builder = new AlertDialog.Builder(context);
111        builder.setTitle(title);
112        builder.setOnCancelListener(new CancelListener());
113        if (mType != PROMPT) {
114            builder.setMessage(displayMessage);
115            builder.setPositiveButton(positiveTextId, new PositiveListener(null));
116        } else {
117            final View view = LayoutInflater.from(context).inflate(
118                    com.android.internal.R.layout.js_prompt, null);
119            EditText edit = ((EditText) view.findViewById(com.android.internal.R.id.value));
120            edit.setText(mDefaultValue);
121            builder.setPositiveButton(positiveTextId, new PositiveListener(edit));
122            ((TextView) view.findViewById(com.android.internal.R.id.message)).setText(mMessage);
123            builder.setView(view);
124        }
125        if (mType != ALERT) {
126            builder.setNegativeButton(negativeTextId, new CancelListener());
127        }
128        builder.show();
129    }
130
131    private class CancelListener implements DialogInterface.OnCancelListener,
132            DialogInterface.OnClickListener {
133        @Override
134        public void onCancel(DialogInterface dialog) {
135            mResult.cancel();
136        }
137        @Override
138        public void onClick(DialogInterface dialog, int which) {
139            mResult.cancel();
140        }
141    }
142
143    private class PositiveListener implements DialogInterface.OnClickListener {
144        private final EditText mEdit;
145
146        public PositiveListener(EditText edit) {
147            mEdit = edit;
148        }
149
150        @Override
151        public void onClick(DialogInterface dialog, int which) {
152            if (mEdit == null) {
153                mResult.confirm();
154            } else {
155                mResult.confirm(mEdit.getText().toString());
156            }
157        }
158    }
159
160    private String getJsDialogTitle(Context context) {
161        String title = mUrl;
162        if (URLUtil.isDataUrl(mUrl)) {
163            // For data: urls, we just display 'JavaScript' similar to Chrome.
164            title = context.getString(com.android.internal.R.string.js_dialog_title_default);
165        } else {
166            try {
167                URL alertUrl = new URL(mUrl);
168                // For example: "The page at 'http://www.mit.edu' says:"
169                title = context.getString(com.android.internal.R.string.js_dialog_title,
170                        alertUrl.getProtocol() + "://" + alertUrl.getHost());
171            } catch (MalformedURLException ex) {
172                // do nothing. just use the url as the title
173            }
174        }
175        return title;
176    }
177
178    private static boolean canShowAlertDialog(Context context) {
179        // We can only display the alert dialog if mContext is
180        // an Activity context.
181        // FIXME: Should we display dialogs if mContext does
182        // not have the window focus (e.g. if the user is viewing
183        // another Activity when the alert should be displayed) ?
184        // See bug 3166409
185        return context instanceof Activity;
186    }
187}
188