AdBlockWebViewClient.java

/*
 * Copyright (c) 2016 Ha Duy Trung
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.github.hidroh.materialistic.widget;

import android.annotation.TargetApi;
import android.os.Build;
import android.webkit.WebResourceResponse;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import java.util.HashMap;
import java.util.Map;

import io.github.hidroh.materialistic.AdBlocker;

public class AdBlockWebViewClient extends WebViewClient {
    private final boolean mAdBlockEnabled;
    private final Map<String, Boolean> mLoadedUrls = new HashMap<>();

    public AdBlockWebViewClient(boolean adBlockEnabled) {
        mAdBlockEnabled = adBlockEnabled;
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @SuppressWarnings("deprecation")
    @Override
    public final WebResourceResponse shouldInterceptRequest(WebView view, String url) {
        if (!mAdBlockEnabled) {
            return super.shouldInterceptRequest(view, url);
        }
        boolean ad;
        if (!mLoadedUrls.containsKey(url)) {
            ad = AdBlocker.isAd(url);
            mLoadedUrls.put(url, ad);
        } else {
            ad = mLoadedUrls.get(url);
        }
        return ad ? AdBlocker.createEmptyResource() :
                super.shouldInterceptRequest(view, url);
    }
}