Force Android WebView to load Ressources via HTTPS

HttpsWebViewExample.java

package at.xtools.httpswebviewexample;

import android.annotation.TargetApi;
import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import java.net.URL;
import java.net.URLConnection;

public class HttpsWebViewExample extends AppCompatActivity {

    WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
			
	//...

        webView = (WebView) findViewById(R.id.exampleWebViewIdInYourLayoutXml);

        webView.setWebViewClient(new WebViewClient() {
            //custom settings
            //...
					
            ///Here it starts to get interesting!
            //Intercept WebView Requests for Android API < 21
            @Deprecated
            @Override
            public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
                if (url.startsWith("http://")) {
                    try {
                        //change protocol of url string
                        url = url.replace("http://","https://");

                        //return modified response
                        URL httpsUrl = new URL(url);
                        URLConnection connection = httpsUrl.openConnection();
                        return new WebResourceResponse(connection.getContentType(), connection.getContentEncoding(), connection.getInputStream());
                    } catch (Exception e) {
                        //an error occurred
                    }
                }
                return super.shouldInterceptRequest(view, url);
            }


            //Intercept WebView Requests for Android API >= 21
            @TargetApi(Build.VERSION_CODES.LOLLIPOP)
            @Override
            public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
                String url = request.getUrl().toString();
                if (url.startsWith("http://")) {
                    try {
                        //change protocol of url string
                        url = url.replace("http://","https://");

                        //return modified response
                        URL httpsUrl = new URL(url);
                        URLConnection connection = httpsUrl.openConnection();
                        return new WebResourceResponse(connection.getContentType(), connection.getContentEncoding(), connection.getInputStream());
                    } catch (Exception e) {
                        //an error occurred
                    }
                }
                return super.shouldInterceptRequest(view, request);
            }

        });
        
    }
}