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      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
     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
     83     protected void onDestroy() {
     84         super.onDestroy();
     85         mWebView.destroy();
     86     }
     87 
     88     private class ChromeClient extends WebChromeClient {
     89         @Override
     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
     99         public void onPageFinished(WebView view, String url) {
    100             mLoading.setVisibility(View.GONE);
    101         }
    102 
    103         @Override
    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