Java 使用Android Studio从assets文件夹将html文件加载到android上的webview
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Loading html file to webview on android from assets folder using Android Studio
提问by Badr Hari
I'm using Android Studio/Gradle.
我正在使用 Android Studio/Gradle。
app\src\main\android_asset folder has the file called chart.html..
app\src\main\android_asset 文件夹中有名为 chart.html 的文件。
I'm trying to load this file to my webview like this:
我正在尝试将此文件加载到我的 webview 中：
WebView view = new WebView(this);
view.getSettings().setJavaScriptEnabled(true);
view.loadUrl("file:///android_asset/chart.html");
setContentView(view);
But I always get the error: could not be loaded because ERR_FILE_NOT_FOUND.
但我总是收到错误：无法加载，因为 ERR_FILE_NOT_FOUND。
What am I missing here?
我在这里缺少什么？
采纳答案by Rustam
The directory name should be assetsnot android_assets
目录名称应该是assets而不是android_assets
Do like this: 
这样做：
As shown in the above pics just right click on your app->New->Folder->Assets Folder
如上图所示，只需右键单击您的应用程序- >新建->文件夹->资产文件夹
Now put your .htmlfile here in assetsfolder.
现在将您的.html文件放在assets文件夹中。
That's it. Done.
就是这样。完毕。
Remaining is same in code what you did.
代码中的其余部分与您所做的相同。
WebView view = new WebView(this);
view.getSettings().setJavaScriptEnabled(true);
view.loadUrl("file:///android_asset/hello.html");
setContentView(view);
回答by Gugelhupf
Similar problem :
类似问题：
I use many productFlavors with different applicationId.
我使用了许多具有不同 applicationId 的 productFlavors。
If I attempt to load a html file from res/raw/file.html I get a ClassNotFoundExceptionDidn't find class "product.flavor.package.R$raw"
如果我尝试从 res/raw/file.html 加载 html 文件，我会收到ClassNotFoundException未找到类“product.flavor.package.R$raw”
The R.java file has a different Package name.
R.java 文件具有不同的包名称。
It look's like you can't load a URL from file like : webView.loadUrl( "file:///android_res/raw/page.html"); because the WebView try to use the R.class file with has a different package name.
看起来您无法从文件中加载 URL，例如： webView.loadUrl( "file:///android_res/raw/page.html"); 因为 WebView 尝试使用具有不同包名的 R.class 文件。
I assume the ERR_FILE_NOT_FOUND from loading a html file from assets has the same problem but you don't see the exception. ( webView.loadUrl( "file:///android_assets/page.html" ); )
我假设从资产加载 html 文件的 ERR_FILE_NOT_FOUND 有同样的问题，但你没有看到异常。( webView.loadUrl( "file:///android_assets/page.html");)
With this small work around I solve my problem :
通过这个小小的工作，我解决了我的问题：
try {
AssetManager assetManager = context.getAssets();
InputStream stream = assetManager.open("page.html");
BufferedReader r = new BufferedReader(new InputStreamReader(stream));
StringBuilder total = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
total.append(line).append("\n");
}
webView.loadDataWithBaseURL(null, total.toString(), "text/html", "UTF-8", null);
} catch (Exception xxx) {
Log.e(TAG, "Load assets/page.html", xxx);
}
I hope this helps. Stephan
我希望这有帮助。斯蒂芬
回答by Harry
Answer from Gugelhupfbut with raw resource.
Advantage from this solution: you keep translation working!
来自Gugelhupf 的回答，但使用原始资源。
此解决方案的优势：您可以保持翻译正常工作！
WebView webView = findViewById(R.id.about_text);
try {
InputStream inputStream = getResources().openRawResource(R.raw.about);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder stringBuilder = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
stringBuilder.append(line).append("\n");
}
webView.loadDataWithBaseURL(null, stringBuilder.toString(), "text/html", "UTF-8", null);
} catch (IOException e) {
e.printStackTrace();
}
