Loading existing .html file with android WebView

StackOverflow https://stackoverflow.com/questions/4027701

Question

I did try samples, demos from Google codes and other resources with WebView, but when i try to do it in my own code, it doesn't work for me.

I want to load myfile.html which i put in assets folder, and using:

private WebView myWebView;

myWebView.loadUrl("file:///android_assets/myfile.html");

On emulator shows error

The web page at file:///android_assets/myfile.html could not be loaded as: The requested file was not found. /android_assets/myfile.html

When i put that file to res/raw/ folder and using:

myWebView.loadUrl("file:///android_res/raw/myfile.html");

then only emulator android 2.2 API level 8 can load the file probably, other older versions show the same error. Am i missing something?

Is there any way of loading an existing .html file in the application package which works on all API versions ?

Was it helpful?

Solution

ok, that was my very stupid mistake. I post the answer here just in case someone has the same problem.

The correct path for files stored in assets folder is file:///android_asset/* (with no "s" for assets folder which i was always thinking it must have a "s").

And, mWebView.loadUrl("file:///android_asset/myfile.html"); works under all API levels.

I still not figure out why mWebView.loadUrl("file:///android_res/raw/myfile.html"); works only on API level 8. But it doesn't matter now.

OTHER TIPS

paste your .html file in assets folder of your project folder. and create an xml file in layout folder with the fol code: my.xml:

<WebView  xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/webview"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
    />

add fol code in activity

setContentView(R.layout.my);
    WebView mWebView = null;
    mWebView = (WebView) findViewById(R.id.webview);
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.loadUrl("file:///android_asset/new.html"); //new.html is html file name.

If your structure should be like this:

/assets/html/index.html

/assets/scripts/index.js

/assets/css/index.css

Then just do ( Android WebView: handling orientation changes )

    if(WebViewStateHolder.INSTANCE.getBundle() == null) { //this works only on single instance of webview, use a map with TAG if you need more
        webView.loadUrl("file:///android_asset/html/index.html");
    } else {
        webView.restoreState(WebViewStateHolder.INSTANCE.getBundle());
    }

Make sure you add

    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
        webSettings.setAllowFileAccessFromFileURLs(true);
        webSettings.setAllowUniversalAccessFromFileURLs(true);
    }

Then just use urls

<html>
<head>
    <meta charset="utf-8">
    <title>Zzzz</title>
    <script src="../scripts/index.js"></script>
    <link rel="stylesheet" type="text/css" href="../css/index.css">

Copy and Paste Your .html file in the assets folder of your Project and add below code in your Activity on onCreate().

        WebView view = new WebView(this);
        view.getSettings().setJavaScriptEnabled(true);
        view.loadUrl("file:///android_asset/**YOUR FILE NAME**.html");
        view.setBackgroundColor(Color.TRANSPARENT);
        setContentView(view);

You could read the html file manually and then use loadData or loadDataWithBaseUrl methods of WebView to show it.

The debug compilation is different from the release one, so:

Consider your Project file structure like that [this case if for a Debug assemble]:

src
  |
  debug
      |
      assets
           |
           index.html

You should call index.html into your WebView like:

WebView web=(WebView)findViewById(R.id.web);
web.loadUrl("file:///android_asset/index.html");

The layout: 

<WebView
android:id="@+id/web"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="top"/>

So forth, for the Release assemble, it should be like: 

src
  |
  release
        |
        assets
             |
             index.html
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