1 /*
2  * Copyright (C) 2014 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 
17 package com.android.tv.settings.about;
18 
19 import com.android.tv.settings.R;
20 
21 import android.app.Activity;
22 import android.content.ActivityNotFoundException;
23 import android.content.Intent;
24 import android.net.Uri;
25 import android.os.Bundle;
26 import android.os.SystemProperties;
27 import android.text.TextUtils;
28 import android.util.Log;
29 import android.widget.Toast;
30 
31 import java.io.File;
32 
33 
34 /**
35  * Displays open source NOTICE files.
36  */
37 public class LicenseActivity extends Activity {
38 
39     private static final String TAG = "LicenseActivity";
40 
41     private static final String DEFAULT_LICENSE_PATH = "/system/etc/NOTICE.html.gz";
42     private static final String PROPERTY_LICENSE_PATH = "ro.config.license_path";
43 
44     @Override
onCreate(Bundle savedInstanceState)45     protected void onCreate(Bundle savedInstanceState) {
46         super.onCreate(savedInstanceState);
47 
48         final String path = SystemProperties.get(PROPERTY_LICENSE_PATH, DEFAULT_LICENSE_PATH);
49         if (TextUtils.isEmpty(path)) {
50             Log.e(TAG, "The system property for the license file is empty");
51             showErrorAndFinish();
52             return;
53         }
54 
55         final File file = new File(path);
56         if (!file.exists() || file.length() == 0) {
57             Log.e(TAG, "License file " + path + " does not exist");
58             showErrorAndFinish();
59             return;
60         }
61 
62         // Kick off external viewer due to WebView security restrictions; we
63         // carefully point it at HTMLViewer, since it offers to decompress
64         // before viewing.
65         final Intent intent = new Intent(Intent.ACTION_VIEW);
66         intent.setDataAndType(Uri.fromFile(file), "text/html");
67         intent.putExtra(Intent.EXTRA_TITLE, getString(R.string.about_legal_license));
68         intent.addCategory(Intent.CATEGORY_DEFAULT);
69         intent.setPackage("com.android.htmlviewer");
70 
71         try {
72             startActivity(intent);
73             finish();
74         } catch (ActivityNotFoundException e) {
75             Log.e(TAG, "Failed to find viewer", e);
76             showErrorAndFinish();
77         }
78     }
79 
showErrorAndFinish()80     private void showErrorAndFinish() {
81         Toast.makeText(this, R.string.about_license_activity_unavailable, Toast.LENGTH_LONG)
82                 .show();
83         finish();
84     }
85 }
86