| /* |
| * Copyright 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.example.androidx.webkit; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| import android.app.Activity; |
| import android.net.Uri; |
| import android.os.Bundle; |
| import android.webkit.WebResourceRequest; |
| import android.webkit.WebResourceResponse; |
| import android.webkit.WebView; |
| import android.webkit.WebViewClient; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| import androidx.annotation.RequiresApi; |
| import androidx.appcompat.app.AppCompatActivity; |
| import androidx.webkit.WebViewAssetLoader; |
| import androidx.webkit.WebViewAssetLoader.InternalStoragePathHandler; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| |
| /** |
| * An {@link Activity} to show case a use case of using {@link InternalStoragePathHandler}. |
| */ |
| public class AssetLoaderInternalStorageActivity extends AppCompatActivity { |
| private static final String DEMO_HTML_CONTENT = |
| "<h3 id=\"data_success_msg\">Successfully loaded html from app files dir!</h3>"; |
| |
| @NonNull private File mPublicDir; |
| @NonNull private File mDemoFile; |
| |
| @NonNull private WebViewAssetLoader mAssetLoader; |
| @NonNull private WebView mWebView; |
| |
| private class MyWebViewClient extends WebViewClient { |
| @Override |
| @SuppressWarnings("deprecation") // use the old one for compatibility with all API levels. |
| public boolean shouldOverrideUrlLoading(WebView view, String url) { |
| return false; |
| } |
| |
| @Override |
| @RequiresApi(21) |
| public WebResourceResponse shouldInterceptRequest(WebView view, |
| WebResourceRequest request) { |
| return mAssetLoader.shouldInterceptRequest(request.getUrl()); |
| } |
| |
| @Override |
| @SuppressWarnings("deprecation") // use the old one for compatibility with all API levels. |
| public WebResourceResponse shouldInterceptRequest(WebView view, String request) { |
| return mAssetLoader.shouldInterceptRequest(Uri.parse(request)); |
| } |
| } |
| |
| @Override |
| @SuppressWarnings("deprecation") /* AsyncTask */ |
| protected void onCreate(@Nullable Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| setContentView(R.layout.activity_asset_loader); |
| setTitle(R.string.asset_loader_internal_storage_activity_title); |
| WebkitHelpers.appendWebViewVersionToTitle(this); |
| |
| mWebView = findViewById(R.id.webview_asset_loader_webview); |
| mWebView.setWebViewClient(new MyWebViewClient()); |
| |
| mPublicDir = new File(getFilesDir(), "public"); |
| mDemoFile = new File(mPublicDir, "some_text.html"); |
| |
| // Host "files/public/" in app's data directory under: |
| // http://appassets.androidplatform.net/public_data/... |
| mAssetLoader = new WebViewAssetLoader.Builder() |
| .addPathHandler("/public_data/", new InternalStoragePathHandler(this, mPublicDir)) |
| .build(); |
| |
| // Write the demo file asynchronously and then load the file after it's written. |
| new WriteFileTask(mDemoFile, DEMO_HTML_CONTENT) { |
| @Override |
| protected void onPostExecute(Void result) { |
| Uri path = new Uri.Builder() |
| .scheme("https") |
| .authority(WebViewAssetLoader.DEFAULT_DOMAIN) |
| .appendPath("public_data") |
| .appendPath("some_text.html") |
| .build(); |
| |
| mWebView.loadUrl(path.toString()); |
| } |
| }.execute(); |
| } |
| |
| @Override |
| protected void onDestroy() { |
| super.onDestroy(); |
| // Clean the test/demo file for tests. |
| mDemoFile.delete(); |
| mPublicDir.delete(); |
| } |
| |
| // Writes to file asynchronously in the background thread. |
| private static class WriteFileTask extends android.os.AsyncTask<Void, Void, Void> { |
| @NonNull private final File mFile; |
| @NonNull private final String mContent; |
| |
| WriteFileTask(@NonNull File file, @NonNull String content) { |
| mFile = file; |
| mContent = content; |
| } |
| |
| @Override |
| protected Void doInBackground(Void... params) { |
| mFile.getParentFile().mkdirs(); |
| try (FileOutputStream fos = new FileOutputStream(mFile)) { |
| fos.write(mContent.getBytes(UTF_8)); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| return null; |
| } |
| |
| } |
| } |