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android - Fit image in webview

I am planning to display images from SD card in a webview in order to take advantage of he built in zoom capabilities of webview. However, I am facing an issue with displaying images that are bigger than screen size (e.g. 1800x1200) to fit the screen initially, like in an ImageView. I want the image to be displayed in full at first and provide zoom control to the users. I have tried using WRAP_CONTENT for webview's width and height, but that does not work. Any ideas? Following is a code snippet I am using:

    String path = getRealPathFromURI(mUriList.get(0)); // this gets the file path
    webView = (WebView) findViewById(R.id.WebView01);
 WebSettings settings= webView.getSettings();
 settings.setBuiltInZoomControls(true);
 settings.setSupportZoom(true);     
 webView.loadUrl("file://" + path);
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 private WebView mWebView2;
    mWebView2 = (WebView)findViewById(R.id.webview);
    mWebView2.getSettings().setJavaScriptEnabled(true);
    mWebView2.getSettings().setLoadWithOverviewMode(true);
    mWebView2.getSettings().setUseWideViewPort(true);
    mWebView2.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
    mWebView2.setScrollbarFadingEnabled(true);
    mWebView2.loadDataWithBaseURL("file:///android_asset/", "<img src="banner5.png" height="98%" width="100%"/>", "text/html", "utf-8", null);

Images are in the assets folder


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