1/*
2 * Copyright (C) 2007 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.settings;
18
19import android.os.Bundle;
20import android.os.Handler;
21import android.os.Message;
22import android.os.SystemProperties;
23import android.text.TextUtils;
24import android.util.Log;
25import android.webkit.WebView;
26import android.webkit.WebViewClient;
27import android.widget.Toast;
28import android.app.Activity;
29import android.app.AlertDialog;
30import android.app.ProgressDialog;
31import android.content.DialogInterface;
32import android.content.DialogInterface.OnDismissListener;
33import android.content.res.Configuration;
34
35import java.io.FileInputStream;
36import java.io.FileNotFoundException;
37import java.io.FileReader;
38import java.io.IOException;
39import java.io.InputStreamReader;
40import java.util.zip.GZIPInputStream;
41
42/**
43 * The "dialog" that shows from "License" in the Settings app.
44 */
45public class SettingsLicenseActivity extends Activity {
46
47    private static final String TAG = "SettingsLicenseActivity";
48    private static final boolean LOGV = false || false;
49
50    private static final String DEFAULT_LICENSE_PATH = "/system/etc/NOTICE.html.gz";
51    private static final String PROPERTY_LICENSE_PATH = "ro.config.license_path";
52
53    private Handler mHandler;
54    private WebView mWebView;
55    private ProgressDialog mSpinnerDlg;
56    private AlertDialog mTextDlg;
57
58    private class LicenseFileLoader implements Runnable {
59
60        private static final String INNER_TAG = "SettingsLicenseActivity.LicenseFileLoader";
61        public static final int STATUS_OK = 0;
62        public static final int STATUS_NOT_FOUND = 1;
63        public static final int STATUS_READ_ERROR = 2;
64        public static final int STATUS_EMPTY_FILE = 3;
65
66        private String mFileName;
67        private Handler mHandler;
68
69        public LicenseFileLoader(String fileName, Handler handler) {
70            mFileName = fileName;
71            mHandler = handler;
72        }
73
74        public void run() {
75
76            int status = STATUS_OK;
77
78            InputStreamReader inputReader = null;
79            StringBuilder data = new StringBuilder(2048);
80            try {
81                char[] tmp = new char[2048];
82                int numRead;
83                if (mFileName.endsWith(".gz")) {
84                    inputReader = new InputStreamReader(
85                        new GZIPInputStream(new FileInputStream(mFileName)));
86                } else {
87                    inputReader = new FileReader(mFileName);
88                }
89
90                while ((numRead = inputReader.read(tmp)) >= 0) {
91                    data.append(tmp, 0, numRead);
92                }
93            } catch (FileNotFoundException e) {
94                Log.e(INNER_TAG, "License HTML file not found at " + mFileName, e);
95                status = STATUS_NOT_FOUND;
96            } catch (IOException e) {
97                Log.e(INNER_TAG, "Error reading license HTML file at " + mFileName, e);
98                status = STATUS_READ_ERROR;
99            } finally {
100                try {
101                    if (inputReader != null) {
102                        inputReader.close();
103                    }
104                } catch (IOException e) {
105                }
106            }
107
108            if ((status == STATUS_OK) && TextUtils.isEmpty(data)) {
109                Log.e(INNER_TAG, "License HTML is empty (from " + mFileName + ")");
110                status = STATUS_EMPTY_FILE;
111            }
112
113            // Tell the UI thread that we are finished.
114            Message msg = mHandler.obtainMessage(status, null);
115            if (status == STATUS_OK) {
116                msg.obj = data.toString();
117            }
118            mHandler.sendMessage(msg);
119        }
120    }
121
122    public SettingsLicenseActivity() {
123        super();
124        mHandler = null;
125        mWebView = null;
126        mSpinnerDlg = null;
127        mTextDlg = null;
128    }
129
130    @Override
131    protected void onCreate(Bundle savedInstanceState) {
132        super.onCreate(savedInstanceState);
133
134        String fileName = SystemProperties.get(PROPERTY_LICENSE_PATH, DEFAULT_LICENSE_PATH);
135        if (TextUtils.isEmpty(fileName)) {
136            Log.e(TAG, "The system property for the license file is empty.");
137            showErrorAndFinish();
138            return;
139        }
140
141        // The activity does not have any view itself,
142        // so set it invisible to avoid displaying the title text in the background.
143        setVisible(false);
144
145        mWebView = new WebView(this);
146
147        mHandler = new Handler() {
148
149            @Override
150            public void handleMessage(Message msg) {
151                super.handleMessage(msg);
152
153                if (msg.what == LicenseFileLoader.STATUS_OK) {
154                    String text = (String) msg.obj;
155                    showPageOfText(text);
156                } else {
157                    showErrorAndFinish();
158                }
159            }
160        };
161
162        CharSequence title = getText(R.string.settings_license_activity_title);
163        CharSequence msg = getText(R.string.settings_license_activity_loading);
164
165        ProgressDialog pd = ProgressDialog.show(this, title, msg, true, false);
166        pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);
167        mSpinnerDlg = pd;
168
169        // Start separate thread to do the actual loading.
170        Thread thread = new Thread(new LicenseFileLoader(fileName, mHandler));
171        thread.start();
172    }
173
174    @Override
175    protected void onDestroy() {
176        if (mTextDlg != null && mTextDlg.isShowing()) {
177            mTextDlg.dismiss();
178        }
179        if (mSpinnerDlg != null && mSpinnerDlg.isShowing()) {
180            mSpinnerDlg.dismiss();
181        }
182        super.onDestroy();
183    }
184
185    private void showPageOfText(String text) {
186        // Create an AlertDialog to display the WebView in.
187        AlertDialog.Builder builder = new AlertDialog.Builder(SettingsLicenseActivity.this);
188        builder.setCancelable(true)
189               .setView(mWebView)
190               .setTitle(R.string.settings_license_activity_title);
191
192        mTextDlg = builder.create();
193        mTextDlg.setOnDismissListener(new OnDismissListener() {
194
195            public void onDismiss(DialogInterface dlgi) {
196                SettingsLicenseActivity.this.finish();
197            }
198        });
199
200        // Begin the loading.  This will be done in a separate thread in WebView.
201        mWebView.loadDataWithBaseURL(null, text, "text/html", "utf-8", null);
202        mWebView.setWebViewClient(new WebViewClient() {
203            @Override
204            public void onPageFinished(WebView view, String url) {
205                mSpinnerDlg.dismiss();
206                if (SettingsLicenseActivity.this.isResumed()) {
207                    mTextDlg.show();
208                }
209            }
210        });
211
212        mWebView = null;
213    }
214
215    private void showErrorAndFinish() {
216        mSpinnerDlg.dismiss();
217        mSpinnerDlg = null;
218        Toast.makeText(this, R.string.settings_license_activity_unavailable, Toast.LENGTH_LONG)
219                .show();
220        finish();
221    }
222}
223