Android Open Source - snakk-ads-android-sample-app Basic Web View

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License

The source code is released under:

Copyright (c) 2012, Snakk! Media Group All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are m...

Java Source Code

package com.snakk.advertising.internal;
/*from   w  ww  .  ja va2 s. c o m*/
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.LinearLayout;

/**
 * Sets up a WebView w/ the appropriate config.  Also handles forwarding external
 * urls to the system where they can be routed appropriately.
 */
public class BasicWebView extends WebView {

    /**
     * override this object to customize webview behavior
     */
    public static class BasicWebViewListener {
        /**
         * callback that allows parent to be notified when leaving application
         * (i.e. when control is transferred over to google play)
         * @param view the view causing a new app to be loaded
         */
        public void willLeaveApplication(BasicWebView view) {}

        /**
         * customize this method if you want to override the default behavior
         * of loading non http/https urls within the webview
         * @param view the web view attempting to load the url
         * @param url the url to be loaded
         * @return true if the url was handled and should not be loaded by the
         *         webview.  false if you want the webview to continue loading
         *         this url.
         */
        public boolean shouldOverrideUrlLoading(BasicWebView view, String url) {
            Log.d("Snakk", "BasicWebView.shouldOverrideUrlLoading(" + url + ')');
            if (BasicWebView.isExternalUrl(url)) {
                willLeaveApplication(view);
                BasicWebView.openInExternalBrowser(view.getContext(), url);
                return true;
            }
            return false;
        }

        /**
         * forwards progress updates to activity (if the view's context happens
         * to be an activity)
         * @param view
         * @param newProgress
         */
        public void onProgressChanged(BasicWebView view, int newProgress) {
            if (view.getContext() instanceof Activity) {
                ((Activity)view.getContext()).setProgress(newProgress * 100);
            }
        }
    }


    private BasicWebViewListener listener = null;


    public BasicWebView(Context context) {
        super(context);
        setup();
    }

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

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

    private void setup() {
        setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT, 1f));
        getSettings().setJavaScriptEnabled(true);
        getSettings().setSupportZoom(true);
        getSettings().setBuiltInZoomControls(true);
//        webView.getSettings().setLoadWithOverviewMode(true); // not supported by older versions of Android
        setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        getSettings().setUseWideViewPort(true);

        setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                if (listener != null) {
                    return listener.shouldOverrideUrlLoading(BasicWebView.this, url);
                }
                return false;
            }

            //TODO offer some way to tell when page is done loading, even in the face of redirects...
            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
            }
        });

        setWebChromeClient(new WebChromeClient() {
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                if (listener != null) {
                    listener.onProgressChanged(BasicWebView.this, newProgress);
                }
            }
        });

        setListener(new BasicWebViewListener()); // setup default listener
    }


    public BasicWebViewListener getListener() {
        return listener;
    }

    public void setListener(BasicWebViewListener listener) {
        this.listener = listener;
    }

    @Override
    public void loadUrl(String url) {
        if (isExternalUrl(url)) {
            openInExternalBrowser(getContext(), url);
        }
        else {
            super.loadUrl(url);
        }
    }

    public static boolean isExternalUrl(String url) {
        return !(url.toLowerCase().startsWith("http://")
                  || url.toLowerCase().startsWith("https://"));
    }

    public static void openInExternalBrowser(Context context, String url) {
        Log.d("Snakk", "BasicWebView.openInExternalBrowser(" + url + ')');
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));

        if (context instanceof SnakkAdActivity) {
            ((Activity)context).startActivityForResult(intent,3);
        }
        else {
            context.startActivity(intent);
        }
    }
}

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