WebView 加载html图片如何适应屏幕大小

private final WebViewClient webViewClient = new WebViewClient() {

@Override
public boolean shouldOverrideUrlLoading(WebView webView, String url) {
if (!TextUtils.isEmpty(url) && !Navigator.openStandardLink(webView.getContext(), url)) {
Navigator.openInBrowser(webView.getContext(), url);
}
return true;
}

@Override
public void onPageFinished(WebView view, String url) {
AlphaWebView.this.onPageFinished(url);
//  html加载完成之后，调用js的方法，使用该方法就可以使html中的图片适应屏幕大小
imgReset();
}

};
private void imgReset() {
loadUrl("javascript:(function(){"
+ "var objs = document.getElementsByTagName('img'); "
+ "for(var i=0;i<objs.length;i++)  " + "{"
+ "var img = objs[i];   "
+ "    img.style.width = '100%';   "
+ "    img.style.height = 'auto';   "
+ "}" + "})()");
}