Webview with swipeRefreshLayout

WebviewFragment.java

package com.credit.checktool.ui;

import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.content.ContextCompat;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.CookieManager;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import com.credit.checktool.R;

import static com.credit.checktool.common.SystemUtil.getPackageInfo;


public class WebviewFragment extends Fragment implements HomeActivity.BackPressedListener, SwipeRefreshLayout.OnRefreshListener {

    private WebView mWebView;
    private SwipeRefreshLayout mRefreshLayout;
    private static final String WEB_URL = "https://www.v2ex.com";
    private String mPreviewUrl;

    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    private String mParam1;
    private String mParam2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_webview, container, false);
        mRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.refreshLayout);
        initFreshLayout();
        mWebView = (WebView) view.findViewById(R.id.webView);
        initWebView();
        return view;
    }

    public WebviewFragment() {
    }

    public static WebviewFragment newInstance(String param1, String param2) {
        WebviewFragment fragment = new WebviewFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    private void initFreshLayout() {
        mRefreshLayout.setOnRefreshListener(this);
        int colorPrimary = ContextCompat.getColor(getActivity(), R.color.colorPrimary);
        int colorAccent = ContextCompat.getColor(getActivity(), R.color.colorAccent);
        int colorPrimaryDark = ContextCompat.getColor(getActivity(), R.color.colorPrimaryDark);
        mRefreshLayout.setColorSchemeColors(colorPrimary, colorAccent, colorPrimaryDark);
    }

    private void initWebView() {
        mWebView.setWebViewClient(new CustWebViewClient());
        mWebView.setWebChromeClient(new CustChromeClient());

        CookieManager.getInstance().setAcceptCookie(true);

        WebSettings webSettings = mWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setCacheMode(WebSettings.LOAD_DEFAULT);
        webSettings.setDomStorageEnabled(true);
        webSettings.setDatabaseEnabled(true);
        String cacheDirPath = getActivity().getFilesDir().getAbsolutePath() + "checktool";
        webSettings.setDatabasePath(cacheDirPath);
        webSettings.setAppCachePath(cacheDirPath);
        webSettings.setDefaultTextEncodingName("utf-8");
        webSettings.setAppCacheEnabled(true);
        String userAgentString = webSettings.getUserAgentString();
        userAgentString += " UDAndroid/" + getPackageInfo(getActivity()).versionName;
        webSettings.setUserAgentString(userAgentString);
        webSettings.setBuiltInZoomControls(true);
        webSettings.setSupportZoom(true);
        webSettings.setDisplayZoomControls(false);
        Log.d("WebviewFragment UA", webSettings.getUserAgentString());
        mWebView.loadUrl(WEB_URL);
    }

    private long exitTime = 0;

    private void doubleBack2Exit() {
        if ((System.currentTimeMillis() - exitTime) > 3000) {
            Snackbar.make(mWebView, getString(R.string.repress_to_exit), Snackbar.LENGTH_LONG)
                    .setAction(getString(R.string.close_btn_text), v -> getActivity().finish())
                    .show();
            exitTime = System.currentTimeMillis();
        } else {
            getActivity().finish();
        }
    }

    @Override
    public void onPressed() {
        if (mWebView.canGoBack() && !mWebView.getUrl().equals(mPreviewUrl)) {
            mPreviewUrl = mWebView.getUrl();
            mWebView.goBack();
        } else {
            mPreviewUrl = mWebView.getUrl();
            doubleBack2Exit();
        }
    }

    @Override
    public void onRefresh() {
        mWebView.reload();
    }

    class CustChromeClient extends WebChromeClient {
        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            Log.d("CustChromeClient", "newProgress:" + newProgress);
            if (newProgress == 100) {
                mRefreshLayout.setRefreshing(false);
            }
            super.onProgressChanged(view, newProgress);
        }
    }

    class CustWebViewClient extends WebViewClient {
        @Override
        public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
            Log.d("CustWebViewClient", "error:" + error.toString());
            mRefreshLayout.setRefreshing(false);
            super.onReceivedError(view, request, error);
        }

        @Override
        public void onReceivedHttpError(WebView view, WebResourceRequest request, WebResourceResponse errorResponse) {
            Log.d("CustWebViewClient", "errorResponse:" + errorResponse.getData());
            mRefreshLayout.setRefreshing(false);
            super.onReceivedHttpError(view, request, errorResponse);
        }

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

        @Override
        public void onPageFinished(WebView view, String url) {
            mRefreshLayout.setRefreshing(false);
            super.onPageFinished(view, url);
        }
    }

}