1 /*
2  * Copyright 2019 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.example.androidx.webkit;
18 
19 import android.app.Activity;
20 import android.net.Uri;
21 import android.os.Bundle;
22 import android.webkit.WebResourceRequest;
23 import android.webkit.WebResourceResponse;
24 import android.webkit.WebView;
25 import android.webkit.WebViewClient;
26 
27 import androidx.appcompat.app.AppCompatActivity;
28 import androidx.webkit.WebViewAssetLoader;
29 
30 import org.jspecify.annotations.NonNull;
31 import org.jspecify.annotations.Nullable;
32 
33 /**
34  * An {@link Activity} to show case a very simple use case of using
35  * {@link androidx.webkit.WebViewAssetLoader}.
36  */
37 public class AssetLoaderSimpleActivity extends AppCompatActivity {
38 
39     private static class MyWebViewClient extends WebViewClient {
40         private final WebViewAssetLoader mAssetLoader;
41 
MyWebViewClient(@onNull WebViewAssetLoader assetLoader)42         MyWebViewClient(@NonNull WebViewAssetLoader assetLoader) {
43             mAssetLoader = assetLoader;
44         }
45 
46         @Override
47         @SuppressWarnings("deprecation") // use the old one for compatibility with all API levels.
shouldOverrideUrlLoading(WebView view, String url)48         public boolean shouldOverrideUrlLoading(WebView view, String url) {
49             return false;
50         }
51 
52         @Override
shouldInterceptRequest(WebView view, WebResourceRequest request)53         public WebResourceResponse shouldInterceptRequest(WebView view,
54                                             WebResourceRequest request) {
55             return mAssetLoader.shouldInterceptRequest(request.getUrl());
56         }
57 
58         @Override
59         @SuppressWarnings("deprecation") // use the old one for compatibility with all API levels.
shouldInterceptRequest(WebView view, String url)60         public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
61             return mAssetLoader.shouldInterceptRequest(Uri.parse(url));
62         }
63     }
64 
65     @Override
onCreate(@ullable Bundle savedInstanceState)66     protected void onCreate(@Nullable Bundle savedInstanceState) {
67         super.onCreate(savedInstanceState);
68 
69         setContentView(R.layout.activity_asset_loader);
70         setTitle(R.string.asset_loader_simple_activity_title);
71         WebkitHelpers.appendWebViewVersionToTitle(this);
72 
73         WebView webView = findViewById(R.id.webview_asset_loader_webview);
74 
75         // Host application assets under http://appassets.androidplatform.net/assets/...
76         WebViewAssetLoader assetLoader = new WebViewAssetLoader.Builder()
77                 .addPathHandler("/assets/", new WebViewAssetLoader.AssetsPathHandler(this))
78                 .build();
79 
80         webView.setWebViewClient(new MyWebViewClient(assetLoader));
81 
82         Uri path = new Uri.Builder()
83                 .scheme("https")
84                 .authority(WebViewAssetLoader.DEFAULT_DOMAIN)
85                 .appendPath("assets")
86                 .appendPath("www")
87                 .appendPath("some_text.html")
88                 .build();
89 
90         webView.loadUrl(path.toString());
91     }
92 }
93