Open HTML via asset

There are two very simple ways. First of all, we need to create the WebView element in XML , for example:

<WebView
    android:id="@+id/webView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

In the Java file, we need to instantiate this element:

WebView navegador = findViewById(R.id.webView);

Once you've done this,

1. Just create a file in the src/main/assets folder, for example codigo.html and within this file, just add your HTML tag. To load the file into WebView using the loadUrl method, for example:

navegador.loadUrl( "file:///android_asset/codigo.html" );

2. Another way is to use the loadData method of WebView , for this we should use getAssets().open("codigo.html"); , for example:

try {
    WebView navegador = findViewById(R.id.webView);

    InputStreamReader inputStream = new InputStreamReader(getAssets().open("codigo.html"));
    StringBuilder codigo = new StringBuilder();
    char[] b = new char[1024];

    while (inputStream.read(b) != -1) {
        codigo.append(b);
    }

    navegador.loadData(codigo.toString(), "text/html", "UTF-8");

} catch (IOException e) {
    e.printStackTrace();
}