Home | History | Annotate | Download | only in about 
      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 android.app.Activity;
     20 import android.app.LoaderManager;
     21 import android.content.ActivityNotFoundException;
     22 import android.content.ContentResolver;
     23 import android.content.Intent;
     24 import android.content.Loader;
     25 import android.net.Uri;
     26 import android.os.Bundle;
     27 import android.os.SystemProperties;
     28 import android.support.annotation.VisibleForTesting;
     29 import android.support.v4.content.FileProvider;
     30 import android.text.TextUtils;
     31 import android.util.Log;
     32 import android.widget.Toast;
     33 
     34 import com.android.settingslib.license.LicenseHtmlLoader;
     35 import com.android.tv.settings.R;
     36 
     37 import java.io.File;
     38 
     39 /**
     40  * Displays open source NOTICE files.
     41  */
     42 public class LicenseActivity extends Activity implements
     43             LoaderManager.LoaderCallbacks<File> {
     44     private static final String TAG = "LicenseActivity";
     45     private static final String FILE_PROVIDER_AUTHORITY = "com.android.settings.files";
     46 
     47     private static final String DEFAULT_LICENSE_PATH = "/system/etc/NOTICE.html.gz";
     48     private static final String PROPERTY_LICENSE_PATH = "ro.config.license_path";
     49 
     50     private static final int LOADER_ID_LICENSE_HTML_LOADER = 0;
     51 
     52     @Override
     53     protected void onCreate(Bundle savedInstanceState) {
     54         super.onCreate(savedInstanceState);
     55 
     56         final String licenseHtmlPath =
     57                 SystemProperties.get(PROPERTY_LICENSE_PATH, DEFAULT_LICENSE_PATH);
     58         if (isFilePathValid(licenseHtmlPath)) {
     59             showSelectedFile(licenseHtmlPath);
     60         } else {
     61             showHtmlFromDefaultXmlFiles();
     62         }
     63     }
     64 
     65     @Override
     66     public Loader<File> onCreateLoader(int id, Bundle args) {
     67         return new LicenseHtmlLoader(this);
     68     }
     69 
     70     @Override
     71     public void onLoadFinished(Loader<File> loader, File generatedHtmlFile) {
     72         showGeneratedHtmlFile(generatedHtmlFile);
     73     }
     74 
     75     @Override
     76     public void onLoaderReset(Loader<File> loader) {
     77     }
     78 
     79     private void showHtmlFromDefaultXmlFiles() {
     80         getLoaderManager().initLoader(LOADER_ID_LICENSE_HTML_LOADER, Bundle.EMPTY, this);
     81     }
     82 
     83     @VisibleForTesting
     84     Uri getUriFromGeneratedHtmlFile(File generatedHtmlFile) {
     85         return FileProvider.getUriForFile(this, FILE_PROVIDER_AUTHORITY, generatedHtmlFile);
     86     }
     87 
     88     private void showGeneratedHtmlFile(File generatedHtmlFile) {
     89         if (generatedHtmlFile != null) {
     90             showHtmlFromUri(getUriFromGeneratedHtmlFile(generatedHtmlFile));
     91         } else {
     92             Log.e(TAG, "Failed to generate.");
     93             showErrorAndFinish();
     94         }
     95     }
     96 
     97     private void showSelectedFile(final String path) {
     98         if (TextUtils.isEmpty(path)) {
     99             Log.e(TAG, "The system property for the license file is empty");
    100             showErrorAndFinish();
    101             return;
    102         }
    103 
    104         final File file = new File(path);
    105         if (!isFileValid(file)) {
    106             Log.e(TAG, "License file " + path + " does not exist");
    107             showErrorAndFinish();
    108             return;
    109         }
    110         showHtmlFromUri(Uri.fromFile(file));
    111     }
    112 
    113     private void showHtmlFromUri(Uri uri) {
    114         // Kick off external viewer due to WebView security restrictions; we
    115         // carefully point it at HTMLViewer, since it offers to decompress
    116         // before viewing.
    117         final Intent intent = new Intent(Intent.ACTION_VIEW);
    118         intent.setDataAndType(uri, "text/html");
    119         intent.putExtra(Intent.EXTRA_TITLE, getString(R.string.about_legal_license));
    120         if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme())) {
    121             intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    122         }
    123         intent.addCategory(Intent.CATEGORY_DEFAULT);
    124         intent.setPackage("com.android.htmlviewer");
    125 
    126         try {
    127             startActivity(intent);
    128             finish();
    129         } catch (ActivityNotFoundException e) {
    130             Log.e(TAG, "Failed to find viewer", e);
    131             showErrorAndFinish();
    132         }
    133     }
    134 
    135     private void showErrorAndFinish() {
    136         Toast.makeText(this, R.string.about_license_activity_unavailable, Toast.LENGTH_LONG)
    137                 .show();
    138         finish();
    139     }
    140 
    141     private boolean isFilePathValid(final String path) {
    142         return !TextUtils.isEmpty(path) && isFileValid(new File(path));
    143     }
    144 
    145     @VisibleForTesting
    146     boolean isFileValid(final File file) {
    147         return file.exists() && file.length() != 0;
    148     }
    149 }
    150