Scroll Webview inside a Scroll View

Question

What I have:
Right now I have a Scroll view as a parent. Inside this scroll view, I am using a WebView that loads a URL and then shows text in it. Here is my xml:

<ScrollView
    android:id="@+id/parentScroll"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/Heading" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp" >

        <WebView
            android:id="@+id/webView"
            android:layout_width="match_parent"
            android:layout_height="300dp"
            android:background="@drawable/webview" />
    </RelativeLayout>
</ScrollView>    

What I want:
I want to scroll webView inside it. When I touch the webView, unfortunately the parent scroll view gets called. I have to keep Parent scroll view also but besides this I want to scroll WebView content inside it when I touch on webView.

How can I do this?

Answer 1

Create a Custom Touch Intercepting Webview

CustomWebview.java

 package com.mypackage.common.custom.android.widgets

public class CustomWebview extends WebView {

    public CustomWebview(Context context) {
        super(context);
    }

    public CustomWebview(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomWebview(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event){
        requestDisallowInterceptTouchEvent(true);
        return super.onTouchEvent(event);
    }          
}

in layout.xml

<com.package.custom.widgets.CustomWebview
                android:id="@+id/view_extra"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                 />

Answer 2

According to Android design documents you should never put a scrolling container inside a scrolling container if they scroll the same direction. It's not meant to handle such a thing.

Answer 3

I had the same problem. You should set your webView Height equal as its content. for this do this:
add this lines to your onCreate method in Activity:

webView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageFinished(WebView view, String url) {
                webView.loadUrl("javascript:MyApp.resize(document.body.getBoundingClientRect().height)");

                super.onPageFinished(view, url);
            }
        });
webView.addJavascriptInterface(this, "MyApp");

and add this method to your activity:

@JavascriptInterface
    public void resize(final float height) {
        MainActivity.this.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                webView.setLayoutParams(new LinearLayout.LayoutParams(getResources().getDisplayMetrics().widthPixels, (int) (height * getResources().getDisplayMetrics().density)));
            }
        });
    }