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 17 package com.android.settings; 18 19 import android.content.ActivityNotFoundException; 20 import android.content.ContentResolver; 21 import android.content.Intent; 22 import android.net.Uri; 23 import android.os.Bundle; 24 import android.util.Log; 25 import android.widget.Toast; 26 27 import androidx.annotation.VisibleForTesting; 28 import androidx.core.content.FileProvider; 29 import androidx.fragment.app.FragmentActivity; 30 import androidx.loader.app.LoaderManager; 31 import androidx.loader.content.Loader; 32 33 import com.android.settingslib.license.LicenseHtmlLoaderCompat; 34 35 import java.io.File; 36 37 /** 38 * The "dialog" that shows from "License" in the Settings app. 39 */ 40 public class SettingsLicenseActivity extends FragmentActivity implements 41 LoaderManager.LoaderCallbacks<File> { 42 private static final String TAG = "SettingsLicenseActivity"; 43 44 private static final String LICENSE_PATH = "/system/etc/NOTICE.html.gz"; 45 46 private static final int LOADER_ID_LICENSE_HTML_LOADER = 0; 47 48 @Override onCreate(Bundle savedInstanceState)49 protected void onCreate(Bundle savedInstanceState) { 50 super.onCreate(savedInstanceState); 51 52 File file = new File(LICENSE_PATH); 53 if (isFileValid(file)) { 54 showHtmlFromUri(Uri.fromFile(file)); 55 } else { 56 showHtmlFromDefaultXmlFiles(); 57 } 58 } 59 60 @Override onCreateLoader(int id, Bundle args)61 public Loader<File> onCreateLoader(int id, Bundle args) { 62 return new LicenseHtmlLoaderCompat(this); 63 } 64 65 @Override onLoadFinished(Loader<File> loader, File generatedHtmlFile)66 public void onLoadFinished(Loader<File> loader, File generatedHtmlFile) { 67 showGeneratedHtmlFile(generatedHtmlFile); 68 } 69 70 @Override onLoaderReset(Loader<File> loader)71 public void onLoaderReset(Loader<File> loader) { 72 } 73 showHtmlFromDefaultXmlFiles()74 private void showHtmlFromDefaultXmlFiles() { 75 getSupportLoaderManager().initLoader(LOADER_ID_LICENSE_HTML_LOADER, Bundle.EMPTY, this); 76 } 77 78 @VisibleForTesting getUriFromGeneratedHtmlFile(File generatedHtmlFile)79 Uri getUriFromGeneratedHtmlFile(File generatedHtmlFile) { 80 return FileProvider.getUriForFile(this, Utils.FILE_PROVIDER_AUTHORITY, 81 generatedHtmlFile); 82 } 83 showGeneratedHtmlFile(File generatedHtmlFile)84 private void showGeneratedHtmlFile(File generatedHtmlFile) { 85 if (generatedHtmlFile != null) { 86 showHtmlFromUri(getUriFromGeneratedHtmlFile(generatedHtmlFile)); 87 } else { 88 Log.e(TAG, "Failed to generate."); 89 showErrorAndFinish(); 90 } 91 } 92 showHtmlFromUri(Uri uri)93 private void showHtmlFromUri(Uri uri) { 94 // Kick off external viewer due to WebView security restrictions; we 95 // carefully point it at HTMLViewer, since it offers to decompress 96 // before viewing. 97 final Intent intent = new Intent(Intent.ACTION_VIEW); 98 intent.setDataAndType(uri, "text/html"); 99 intent.putExtra(Intent.EXTRA_TITLE, getString(R.string.settings_license_activity_title)); 100 if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme())) { 101 intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); 102 } 103 intent.addCategory(Intent.CATEGORY_DEFAULT); 104 intent.setPackage("com.android.htmlviewer"); 105 106 try { 107 startActivity(intent); 108 finish(); 109 } catch (ActivityNotFoundException e) { 110 Log.e(TAG, "Failed to find viewer", e); 111 showErrorAndFinish(); 112 } 113 } 114 showErrorAndFinish()115 private void showErrorAndFinish() { 116 Toast.makeText(this, R.string.settings_license_activity_unavailable, Toast.LENGTH_LONG) 117 .show(); 118 finish(); 119 } 120 121 @VisibleForTesting isFileValid(final File file)122 boolean isFileValid(final File file) { 123 return file.exists() && file.length() != 0; 124 } 125 } 126