Use meta viewport width in Android Webview
I would like to use the viewport tag to fit html content into a WebView.
<meta name='viewport' content='width=640'/>
This seems to work fine in Chrome browser, but does not scale to fit in the WebView. I made a simplified test activity:
public class MyActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//--------------------------------------------------
// Create a simple html page including viewport tag.
//--------------------------------------------------
String html = "<!DOCTYPE html>" +
"<html>" +
"<head>" +
"<meta name='viewport' content='width=640'/>" +
"<title>Viewport Test</title>" +
"</head>" +
"<body style=\"margin: 0px;\">" +
"<div style=\"width: 600px; height: 600px; border: 20px solid green; background-color: red;\"></div>" +
"</body>" +
"</html>";
//-----------------------------------
// Place html in WebView.
//-----------------------------------
WebView webView = new WebView(this);
webView.loadData(html, "text/html", "utf-8");
setContentView(webView);
//-----------------------------------
// Launch Chrome with the same html.
//-----------------------------------
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setComponent(ComponentName.unflattenFromString("com.android.chrome/com.android.chrome.Main"));
intent.setData(Uri.parse("data:text/html;charset=utf-8;base64," + Base64.encodeToString(html.getBytes(), Base64.NO_WRAP)));
startActivity(intent);
}
}
Can anyone explain why, or suggest a fix?
Answer
OK, you have to use:
WebSettings settings = webView.getSettings();
settings.setLoadWithOverviewMode(true);
settings.setUseWideViewPort(true);
But also, it breaks if you set user-scalable=0 like this:
<meta name='viewport' content='width=640, user-scalable=0'/>