1 /* 2 * Copyright (C) 2008 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.htmlviewer; 18 19 import android.app.Activity; 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.view.View; 26 import android.webkit.WebChromeClient; 27 import android.webkit.WebResourceRequest; 28 import android.webkit.WebResourceResponse; 29 import android.webkit.WebSettings; 30 import android.webkit.WebView; 31 import android.webkit.WebViewClient; 32 33 import java.io.IOException; 34 import java.io.InputStream; 35 import java.util.zip.GZIPInputStream; 36 37 /** 38 * Simple activity that shows the requested HTML page. This utility is 39 * purposefully very limited in what it supports, including no network or 40 * JavaScript. 41 */ 42 public class HTMLViewerActivity extends Activity { 43 private static final String TAG = "HTMLViewer"; 44 45 private WebView mWebView; 46 private View mLoading; 47 48 @Override onCreate(Bundle savedInstanceState)49 protected void onCreate(Bundle savedInstanceState) { 50 super.onCreate(savedInstanceState); 51 52 setContentView(R.layout.main); 53 54 mWebView = (WebView) findViewById(R.id.webview); 55 mLoading = findViewById(R.id.loading); 56 57 mWebView.setWebChromeClient(new ChromeClient()); 58 mWebView.setWebViewClient(new ViewClient()); 59 60 WebSettings s = mWebView.getSettings(); 61 s.setUseWideViewPort(true); 62 s.setSupportZoom(true); 63 s.setBuiltInZoomControls(true); 64 s.setDisplayZoomControls(false); 65 s.setSavePassword(false); 66 s.setSaveFormData(false); 67 s.setBlockNetworkLoads(true); 68 69 // Javascript is purposely disabled, so that nothing can be 70 // automatically run. 71 s.setJavaScriptEnabled(false); 72 s.setDefaultTextEncodingName("utf-8"); 73 74 final Intent intent = getIntent(); 75 if (intent.hasExtra(Intent.EXTRA_TITLE)) { 76 setTitle(intent.getStringExtra(Intent.EXTRA_TITLE)); 77 } 78 79 mWebView.loadUrl(String.valueOf(intent.getData())); 80 } 81 82 @Override onDestroy()83 protected void onDestroy() { 84 super.onDestroy(); 85 mWebView.destroy(); 86 } 87 88 private class ChromeClient extends WebChromeClient { 89 @Override onReceivedTitle(WebView view, String title)90 public void onReceivedTitle(WebView view, String title) { 91 if (!getIntent().hasExtra(Intent.EXTRA_TITLE)) { 92 HTMLViewerActivity.this.setTitle(title); 93 } 94 } 95 } 96 97 private class ViewClient extends WebViewClient { 98 @Override onPageFinished(WebView view, String url)99 public void onPageFinished(WebView view, String url) { 100 mLoading.setVisibility(View.GONE); 101 } 102 103 @Override shouldInterceptRequest(WebView view, WebResourceRequest request)104 public WebResourceResponse shouldInterceptRequest(WebView view, 105 WebResourceRequest request) { 106 final Uri uri = request.getUrl(); 107 if (ContentResolver.SCHEME_FILE.equals(uri.getScheme()) 108 && uri.getPath().endsWith(".gz")) { 109 Log.d(TAG, "Trying to decompress " + uri + " on the fly"); 110 try { 111 final InputStream in = new GZIPInputStream( 112 getContentResolver().openInputStream(uri)); 113 final WebResourceResponse resp = new WebResourceResponse( 114 getIntent().getType(), "utf-8", in); 115 resp.setStatusCodeAndReasonPhrase(200, "OK"); 116 return resp; 117 } catch (IOException e) { 118 Log.w(TAG, "Failed to decompress; falling back", e); 119 } 120 } 121 return null; 122 } 123 } 124 } 125