Error: Android-XML:Placing a in a parent element that uses a wrap_content size can lead to subtle bugs; use match_parent

Question

I am a beginner in Android and building a linear layout and getting an error in the layout XML file like this,

Error

 Placi         


        

Answer 1

Contrary to what most answers imply, this is not a bug in Eclipse resp. Android Studio, but a fair warning. It's produced by a LINT check on your layout.

You can remove the warning and work around the 'subtile bugs' like so:

1. Add tools:ignore="WebViewLayout" to your WebView (thanks to @StefanDeitmar) and make the tools namespace known by adding xmlns:tools="http://schemas.android.com/tools" to your outmost layout element.
2. In your code, add a WebViewClient to your WebView and implement the OnPageFinished() callback to invoke a requestLayout() on your wrapping layout element.

mWebView.setWebViewClient(new WebViewClient() {
    @Override
    public void onPageFinished(WebView webView, String url) {
        super.onPageFinished(webView, url);
        mSurroundingLayout.requestLayout();
    }
}