Android WebView app with splash screen and Parse Push support

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.myapp.myapp" >
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
    <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
    <permission android:protectionLevel="signature" android:name="com.parse.starter.permission.C2D_MESSAGE" />
    <uses-permission android:name="com.myapp.myapp.permission.C2D_MESSAGE" />

    <application
        android:name="com.myapp.myapp.Application"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@android:style/Theme.Black.NoTitleBar" >
        <activity
            android:name=".MainActivity"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service android:name="com.parse.PushService" />
        <receiver android:name=".ParsePushCustomBroadcastReceiver"
            android:exported="false">
            <intent-filter>
                <action android:name="com.parse.push.intent.RECEIVE" />
                <action android:name="com.parse.push.intent.DELETE" />
                <action android:name="com.parse.push.intent.OPEN" />
            </intent-filter>
        </receiver>
        <receiver android:name="com.parse.GcmBroadcastReceiver"
            android:permission="com.google.android.c2dm.permission.SEND">
            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
                <action android:name="com.google.android.c2dm.intent.REGISTRATION" />

                <category android:name="com.myapp.myapp" />
            </intent-filter>
        </receiver>
    </application>

</manifest>

Application.java

package com.myapp.myapp;

import com.parse.Parse;

public class Application extends android.app.Application {

    @Override
    public void onCreate() {
        super.onCreate();
        Parse.initialize(this, "HIDDEN", "HIDDEN");
    }

}

DetectConnection.java

package com.myapp.myapp;

import android.content.Context;
import android.net.ConnectivityManager;

public class DetectConnection {
    public static boolean checkInternetConnection(Context context) {

        ConnectivityManager con_manager = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);

        if (con_manager.getActiveNetworkInfo() != null
                && con_manager.getActiveNetworkInfo().isAvailable()
                && con_manager.getActiveNetworkInfo().isConnected()) {
            return true;
        } else {
            return false;
        }
    }
}

main_activity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mains"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:background="#1e2b3e">
    <ImageView
        android:id="@+id/splashImage"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="visible"
        android:src="@drawable/splash" />
    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_gravity="center"
        android:layout_marginBottom="201dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true" />
    <ImageView
        android:id="@+id/noInternetImage"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"
        android:src="@drawable/no_internet" />
    <WebView
        android:id="@+id/webview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"
        />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Réessayer"
        android:id="@+id/retryButton"
        android:layout_marginBottom="70dp"
        android:paddingLeft="50dp"
        android:paddingRight="50dp"
        android:textSize="20dp"
        android:visibility="gone"
        android:onClick="reloadWebView"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

MainActivity.java

package com.myapp.myapp;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.webkit.CookieManager;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.ProgressBar;

import com.parse.ParseInstallation;

public class MainActivity extends Activity {

    private Activity activity;
    private WebView webView;
    private View noInternetImage, splashImage;
    private ProgressBar progressBar;
    private Button retryButton;

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

        activity = this;
        splashImage = findViewById(R.id.splashImage);
        progressBar = (ProgressBar)findViewById(R.id.progressBar);
        webView = (WebView)findViewById(R.id.webview);
        noInternetImage = findViewById(R.id.noInternetImage);
        retryButton = (Button)findViewById(R.id.retryButton);

        webView.setBackgroundColor(Color.parseColor("#1e2b3e"));
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebViewClient(new MyWebViewClient());
        webView.setWebChromeClient(new WebChromeClient());

        if (!DetectConnection.checkInternetConnection(activity)) {
            showNoInternetScreen();
        } else {
            String url = getUrlFromParamsOrDefault();
            webView.loadUrl(url);
        }
    }

    private class MyWebViewClient extends WebViewClient
    {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (!DetectConnection.checkInternetConnection(activity)) {
                showNoInternetScreen();
            } else {
                view.loadUrl(url);
            }
            return true;
        }

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

        @Override
        public void onPageFinished(final WebView view, final String url) {
            setParseUser(url);
            showWebView();
            super.onPageFinished(view, url);
        }

        public void setParseUser(final String url) {
            String userId = getCookie(url, "snp_notification_id");
            if (userId != null) {
                ParseInstallation installation = ParseInstallation.getCurrentInstallation();
                installation.put("userId", userId);
                installation.saveInBackground();
            }
        }

        public String getCookie(String siteName, String cookieName){
            CookieManager cookieManager = CookieManager.getInstance();
            String cookiesString = CookieManager.getInstance().getCookie(siteName);
            String[] cookiesArray = cookiesString.split(";");
            for (String cookie : cookiesArray ){
                String[] keyValueArray = cookie.split("=");
                String key = keyValueArray[0];
                String value = keyValueArray[1];
                if (key.equals(cookieName)) return value;
            }
            return null;
        }
    }

    public void reloadWebView(View view) {
        if (!DetectConnection.checkInternetConnection(activity)) {
            showNoInternetScreen();
        } else {
            showLoadingScreen();
            String url = getUrlFromParamsOrDefault();
            webView.loadUrl(url);
        }
    }

    private void showWebView() {
        webView.setVisibility(View.VISIBLE);
        noInternetImage.setVisibility(View.GONE);
        retryButton.setVisibility(View.GONE);
        splashImage.setVisibility(View.GONE);
        progressBar.setVisibility(View.GONE);
    }

    private void showLoadingScreen() {
        webView.setVisibility(View.GONE);
        noInternetImage.setVisibility(View.GONE);
        retryButton.setVisibility(View.GONE);
        splashImage.setVisibility(View.VISIBLE);
        progressBar.setVisibility(View.VISIBLE);
    }

    private void showNoInternetScreen() {
        noInternetImage.setVisibility(View.VISIBLE);
        retryButton.setVisibility(View.VISIBLE);
        splashImage.setVisibility(View.GONE);
        progressBar.setVisibility(View.GONE);
        webView.setVisibility(View.GONE);
    }

    private String getUrlFromParamsOrDefault() {
        String url = "https://www.example.com";
        Bundle extras = getIntent().getExtras();
        if (extras != null) { url = extras.getString("url"); }
        return url;
    }

    @Override
    public void onBackPressed() {
        if (webView != null && webView.canGoBack()) {
            webView.goBack();
        } else {
            super.onBackPressed();
        }
    }

}

ParsePushCustomBroadcastReceiver.java

package com.myapp.myapp;

import android.content.Context;
import android.content.Intent;

import com.parse.ParsePushBroadcastReceiver;

import org.json.JSONException;
import org.json.JSONObject;

public class ParsePushCustomBroadcastReceiver extends ParsePushBroadcastReceiver {

    @Override
    public void onPushOpen(Context context, Intent intent) {
        String url = "";
        String json = intent.getExtras().getString("com.parse.Data");
        try {
            JSONObject params = new JSONObject(json);
            url = params.getString("url");
        } catch (JSONException e) {
            e.printStackTrace();
        }
        Intent i = new Intent(context, MainActivity.class);
        i.putExtra("url", url);
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);
    }

}