谷歌登录后，android webview 中显示的空白页面

如何解决谷歌登录后，android webview 中显示的空白页面

我的网站在 wordpress 中，使用谷歌登录，在桌面上运行良好。但是android WebView 应用程序有问题。

下面是我的代码：

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:installLocation="auto"
    package="com.xyz.webviewapp">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <!--
    You can easily change the main theme. Just modify application.android:theme attribute.
    There are 10 themes you can use:
        Theme.WebViewApp.Blue
        Theme.WebViewApp.brown
        Theme.WebViewApp.Gray
        Theme.WebViewApp.Green
        Theme.WebViewApp.Lime
        Theme.WebViewApp.Orange
        Theme.WebViewApp.Purple
        Theme.WebViewApp.Red
        Theme.WebViewApp.teal
        Theme.WebViewApp.Violet
    -->

    <application
        android:name=".WebViewAppApplication"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/Theme.WebViewApp.Blue"
        android:hardwareAccelerated="true"
        android:allowBackup="true"
        android:supportsRtl="true"
        android:usesCleartextTraffic="true"
        tools:ignore="AllowBackup,UnusedAttribute">
        CookieManager.getInstance().setAcceptCookie(true);
        <activity
            android:name=".activity.SplashActivity"
            android:theme="@style/Theme.WebViewApp.Splash">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name=".activity.MainActivity"
            android:label="@string/app_name"
            android:launchMode="standard"
            android:configChanges="keyboard|keyboardHidden|orientation|screenSize">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.broWSABLE" />
                <data android:scheme="http" />
                <data android:scheme="https" />
                <data android:host="@string/app_deep_link_host" />
                <data android:pathPattern="@string/app_deep_link_path" />
            </intent-filter>
        </activity>

        <service
            android:name=".fcm.WebViewAppFirebaseMessagingService"
            android:stopWithTask="false"
            tools:ignore="ExportedService">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>

        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="${applicationId}.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <Meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths">
            </Meta-data>
        </provider>

        <Meta-data
            android:name="com.google.firebase.messaging.default_notification_icon"
            android:resource="@drawable/ic_stat_notification" />

        <Meta-data
            android:name="com.google.firebase.messaging.default_notification_color"
            android:resource="@color/global_color_accent" />

        <Meta-data
            android:name="com.google.firebase.messaging.default_notification_channel_id"
            android:value="@string/fcm_default_notification_channel_id" />

        <Meta-data
            android:name="com.google.android.gms.ads.APPLICATION_ID"
            android:value="@string/admob_app_id" />

        <Meta-data
            android:name="onesignal_app_id"
            android:value="@string/onesignal_app_id"
            tools:replace="android:value" />

        <Meta-data
            android:name="onesignal_google_project_number"
            android:value="str:REMOTE"
            tools:replace="android:value" />

        <Meta-data
            android:name="com.onesignal.Notificationopened.DEFAULT"
            android:value="disABLE" />




    </application>
</manifest>

activity -> mainactivity.java

package com.robotemplates.webviewapp.activity;

import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;

import com.google.android.material.navigation.NavigationView;
import com.google.android.material.snackbar.Snackbar;
import com.robotemplates.kozuza.Kozuza;
import com.robotemplates.webviewapp.R;
import com.robotemplates.webviewapp.WebViewAppConfig;
import com.robotemplates.webviewapp.ads.AdMobGdprHelper;
import com.robotemplates.webviewapp.ads.AdMobInterstitialHelper;
import com.robotemplates.webviewapp.fragment.MainFragment;
import com.robotemplates.webviewapp.listener.DrawerStateListener;
import com.robotemplates.webviewapp.listener.LoadUrlListener;
import com.robotemplates.webviewapp.utility.IntentUtility;
import com.robotemplates.webviewapp.utility.ratingUtility;

public class MainActivity extends AppCompatActivity implements LoadUrlListener,DrawerStateListener {
    public static final String EXTRA_URL = "url";

    private DrawerLayout mDrawerLayout;
    private NavigationView mNavigationView;
    private ActionBarDrawerToggle mDrawerToggle;
    private String mUrl;
    private AdMobInterstitialHelper mAdMobInterstitialHelper = new AdMobInterstitialHelper();

    public static Intent newIntent(Context context) {
        Intent intent = new Intent(context,MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        return intent;
    }

    public static Intent newIntent(Context context,String url) {
        Intent intent = new Intent(context,MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra(EXTRA_URL,url);
        return intent;
    }

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

        // handle intent extras
        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            handleExtras(extras);
        }

        // handle intent data
        String data = getIntent().getDataString();
        if (data != null) {
            handleData(data);
        }

        // setup action bar and drawer
        setupActionBar();
        setupDrawer(savedInstanceState);

        // bind data
        setupView();

        // gdpr
        AdMobGdprHelper adMobGdprHelper = new AdMobGdprHelper(this,getString(R.string.admob_publisher_id),WebViewAppConfig.GDPR_PRIVACY_POLICY_URL);
        adMobGdprHelper.requestConsent();

        // admob
        mAdMobInterstitialHelper.setupAd(this);

        // check rate app prompt
        ratingUtility.checkRateAppPrompt(this);

        // kozuza
        Kozuza.process(this);
    }

    @Override
    public void onStart() {
        super.onStart();
    }

    @Override
    public void onResume() {
        super.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
    }

    @Override
    public void onStop() {
        super.onStop();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    @Override
    public void onActivityResult(int requestCode,int resultCode,Intent intent) {
        super.onActivityResult(requestCode,resultCode,intent);

        // forward activity result to fragment
        Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.container_drawer_content);
        if (fragment != null) {
            fragment.onActivityResult(requestCode,intent);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // action bar menu
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onoptionsItemSelected(@NonNull MenuItem item) {
        // open or close the drawer if home button is pressed
        if (mDrawerToggle.onoptionsItemSelected(item)) {
            return true;
        }

        // action bar menu behavior
        if (item.getItemId() == android.R.id.home) {
            Intent intent = MainActivity.newIntent(this);
            startActivity(intent);
            return true;
        }

        return super.onoptionsItemSelected(item);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(@NonNull Configuration newConfiguration) {
        super.onConfigurationChanged(newConfiguration);
        mDrawerToggle.onConfigurationChanged(newConfiguration);
    }

    @Override
    public void onBackpressed() {
        if (isDraweropen()) {
            mDrawerLayout.closeDrawer(GravityCompat.START);
        } else {
            if (WebViewAppConfig.EXIT_CONFIRMATION) {
                Snackbar
                        .make(findViewById(R.id.main_coordinator_layout),R.string.main_exit_snackbar,Snackbar.LENGTH_LONG)
                        .setAction(R.string.main_exit_confirm,view -> MainActivity.super.onBackpressed())
                        .show();
            } else {
                super.onBackpressed();
            }
        }
    }

    @Override
    public void onLoadUrl(String url) {
        boolean showInAppReviewDialog = ratingUtility.checkInAppReviewDialog(this);
        if (!showInAppReviewDialog) {
            mAdMobInterstitialHelper.checkAd(this);
        }
    }

    @Override
    public boolean isDraweropen() {
        return mDrawerLayout.isDrawerOpen(GravityCompat.START);
    }

    @Override
    public void onBackButtonpressed() {
        onBackpressed();
    }

    public void showInterstitialAd() {
        mAdMobInterstitialHelper.forceAd(this);
    }

    private void setupActionBar() {
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        ActionBar bar = getSupportActionBar();
        bar.setdisplayUselogoEnabled(false);
        bar.setdisplayShowTitleEnabled(true);
        bar.setdisplayShowHomeEnabled(true);
        bar.setdisplayHomeAsUpEnabled(WebViewAppConfig.NAVIGATION_DRAWER);
        bar.setHomeButtonEnabled(WebViewAppConfig.NAVIGATION_DRAWER);
        if (!WebViewAppConfig.ACTION_BAR) bar.hide();
    }

    private void setupDrawer(Bundle savedInstanceState) {
        // reference
        mDrawerLayout = findViewById(R.id.main_drawer_layout);
        mNavigationView = findViewById(R.id.main_drawer_navigation);

        // add menu items
        MenuItem firstItem = setupMenu(mNavigationView.getMenu());

        // menu icon tint
        if (!WebViewAppConfig.NAVIGATION_DRAWER_ICON_TINT) {
            mNavigationView.setItemIconTintList(null);
        }

        // navigation listener
        mNavigationView.setNavigationItemSelectedListener(item -> {
            // check in-app review dialog
            boolean showInAppReviewDialog = ratingUtility.checkInAppReviewDialog(this);
            if (!showInAppReviewDialog) {
                // check interstitial ad
                mAdMobInterstitialHelper.checkAd(this);
            }

            // select drawer item
            selectDrawerItem(item);
            return true;
        });

        // drawer toggle
        mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout,R.string.drawer_open,R.string.drawer_close) {
            @Override
            public void onDrawerClosed(View view) {
                supportInvalidateOptionsMenu();
            }

            @Override
            public void onDrawerOpened(View drawerView) {
                supportInvalidateOptionsMenu();
            }
        };
        mDrawerLayout.addDrawerListener(mDrawerToggle);

        // disable navigation drawer
        if (!WebViewAppConfig.NAVIGATION_DRAWER) {
            mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED,GravityCompat.START);
        }

        // show initial fragment
        if (savedInstanceState == null) {
            if (mUrl == null) {
                selectDrawerItem(firstItem);
            } else {
                selectDrawerItem(mUrl);
            }
        }
    }

    private MenuItem setupMenu(Menu menu) {
        // title list
        String[] titles = getResources().getStringArray(R.array.navigation_title_list);

        // url list
        String[] urls = getResources().getStringArray(R.array.navigation_url_list);

        // icon list
        TypedArray iconTypedArray = getResources().obtainTypedArray(R.array.navigation_icon_list);
        Integer[] icons = new Integer[iconTypedArray.length()];
        for (int i = 0; i < iconTypedArray.length(); i++) {
            icons[i] = iconTypedArray.getResourceId(i,-1);
        }
        iconTypedArray.recycle();

        // clear menu
        menu.clear();

        // add menu items
        Menu parent = menu;
        MenuItem firstItem = null;
        for (int i = 0; i < titles.length; i++) {
            if (urls[i].equals("")) {
                // category
                parent = menu.addSubMenu(Menu.NONE,i,titles[i]);
            } else {
                // item
                MenuItem item = parent.add(Menu.NONE,titles[i]);
                if (icons[i] != -1) item.setIcon(icons[i]);
                if (firstItem == null) firstItem = item;
            }
        }

        return firstItem;
    }

    private void selectDrawerItem(MenuItem item) {
        int position = item.getItemId();

        String[] urlList = getResources().getStringArray(R.array.navigation_url_list);
        String[] shareList = getResources().getStringArray(R.array.navigation_share_list);

        String url = urlList[position];
        if (IntentUtility.startIntentActivity(this,url)) return; // check for intent url

        Fragment fragment = MainFragment.newInstance(url,shareList[position]);
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.container_drawer_content,fragment).commitAllowingStateLoss();

        item.setCheckable(true);
        mNavigationView.setCheckedItem(position);
        getSupportActionBar().setTitle(item.getTitle());
        mDrawerLayout.closeDrawers();
    }

    private void selectDrawerItem(String url) {
        if (IntentUtility.startIntentActivity(this,"");
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.container_drawer_content,fragment).commitAllowingStateLoss();

        mNavigationView.setCheckedItem(-1);
        getSupportActionBar().setTitle(getString(R.string.app_name));
        mDrawerLayout.closeDrawers();
    }

    private void handleExtras(Bundle extras) {
        if (extras.containsKey(EXTRA_URL)) {
            mUrl = extras.getString(EXTRA_URL);
        }
    }

    private void handleData(String data) {
        mUrl = data;
    }

    private void setupView() {
        // reference
        NavigationView navigationView = findViewById(R.id.main_drawer_navigation);

        // inflate navigation header
        if (navigationView.getHeaderView(0) == null) {
            View headerView = getLayoutInflater().inflate(R.layout.navigation_header,navigationView,false);
            navigationView.addHeaderView(headerView);
        }

        // navigation header content
        if (navigationView.getHeaderView(0) != null) {
            // reference
            View headerView = navigationView.getHeaderView(0);

            // header background
            if (WebViewAppConfig.NAVIGATION_DRAWER_HEADER_IMAGE) {
                headerView.setBackgroundResource(R.drawable.navigation_header_bg);
            }
        }
    }
}

WebViewAppApplication.java

package com.robotemplates.webviewapp;

import android.content.Context;

import androidx.multidex.MultiDex;

import com.google.android.gms.ads.MobileAds;
import com.google.firebase.analytics.FirebaseAnalytics;
import com.onesignal.Onesignal;
import com.robotemplates.kozuza.BaseApplication;
import com.robotemplates.kozuza.Kozuza;
import com.robotemplates.webviewapp.ads.AdMobUtility;
import com.robotemplates.webviewapp.fcm.OnesignalNotificationopenedHandler;
import com.robotemplates.webviewapp.utility.Preferences;

import org.alfonz.utility.Logcat;

public class WebViewAppApplication extends BaseApplication {
    @Override
    public void onCreate() {
        super.onCreate();

        // init logcat
        Logcat.init(WebViewAppConfig.LOGS,"STUDENTPORTAL");

        // init analytics
        FirebaseAnalytics.getInstance(this).setAnalyticsCollectionEnabled(!WebViewAppConfig.DEV_ENVIRONMENT);

        // init AdMob
        MobileAds.initialize(this);
        MobileAds.setRequestConfiguration(AdMobUtility.createRequestConfiguration());

        // init Onesignal
        initOnesignal(getString(R.string.onesignal_app_id));
    }

    @Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(base);
        MultiDex.install(this);
    }

    @Override
    public String getPurchaseCode() {
        return WebViewAppConfig.PURCHASE_CODE;
    }

    @Override
    public String getProduct() {
        return Kozuza.PRODUCT_WEBVIEWAPP;
    }

    private void initOnesignal(String onesignalAppId) {
        if (!onesignalAppId.equals("")) {
            Onesignal.initWithContext(this);
            Onesignal.setAppId(onesignalAppId);
            Onesignal.setNotificationopenedHandler(new OnesignalNotificationopenedHandler());
            Onesignal.addSubscriptionObserver(stateChanges -> {
                if (stateChanges.getTo().isSubscribed()) {
                    String userId = stateChanges.getTo().getUserId();
                    saveOnesignalUserId(userId);
                }
            });
            saveOnesignalUserId(Onesignal.getDeviceState().getUserId());
        }
    }

    private void saveOnesignalUserId(String userId) {
        if (userId != null) {
            Logcat.d("userId = " + userId);
            Preferences preferences = new Preferences();
            preferences.setonesignalUserId(userId);
        }
    }
}

WebViewAppConfig.java

package com.robotemplates.webviewapp;

import com.robotemplates.webviewapp.view.PullToRefreshMode;

import static com.robotemplates.webviewapp.view.PullToRefreshMode.*;

public class WebViewAppConfig {
    // Envato purchase code
    public static final String PURCHASE_CODE = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX";

    // true for showing action bar
    public static final boolean ACTION_BAR = false;

    // true for showing html title rather than navigation title in the action bar
    public static final boolean ACTION_BAR_HTML_TITLE = false;

    // true for enabling navigation drawer menu
    public static final boolean NAVIGATION_DRAWER = false;

    // true for enabling background image in the header of the navigation drawer menu,// otherwise accent color will be used,// background image is stored in navigation_header_bg.png
    public static final boolean NAVIGATION_DRAWER_HEADER_IMAGE = false;

    // true for enabling icon tint in the navigation drawer menu,// note that only transparent PNG icons can be tinted,// tint color is defined in @color/navigation_icon_tint
    public static final boolean NAVIGATION_DRAWER_ICON_TINT = false;

    // true for enabling exit confirmation when back button is pressed
    public static final boolean EXIT_CONFIRMATION = true;

    // true for enabling geolocation
    public static final boolean GEOLOCATION = true;

    // true for enabling progress placeholder when loading a first page
    public static final boolean PROGRESS_PLACEHOLDER = true;

    // true for enabling javascript api
    public static final boolean JAVA_SCRIPT_API = true;

    // pull-to-refresh gesture for refreshing the content,// set ENABLED to enable the gesture,set disABLED to disable the gesture,// set PROGRESS to disable the gesture and show only progress indicator
    public static final PullToRefreshMode PULL_TO_REFRESH = ENABLED;

    // frequency of showing in-app review dialog,// review dialog will be shown after each x url loadings or clicks on navigation drawer menu,// set 0 if you do not want to show in-app review dialog
    public static final int INAPP_REVIEW_DIALOG_FREQUENCY = 30;

    // frequency of showing rate my app prompt,// prompt will be shown after each x launches of the app,// set 0 if you do not want to show rate my app prompt
    public static final int RATE_APP_PROMPT_FREQUENCY = 0;

    // duration of showing rate my app prompt in milliseconds
    public static final int RATE_APP_PROMPT_DURATION = 10000;

    // custom user agent string for the webview,// leave this constant empty if you do not want to set custom user agent string
    public static final String WEBVIEW_USER_AGENT = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/41.0.2228.0 Safari/537.36";

    // frequency of showing AdMob interstitial ad,// ad will be shown after each x url loadings or clicks on navigation drawer menu
    public static final int ADMOB_INTERSTITIAL_FREQUENCY = 50000000;

    // URL link to your privacy policy for GDPR consent form,// leave this constant empty if you do not want to show GDPR consent form
    public static final String GDPR_PRIVACY_POLICY_URL = "https://link.to/privacy-policy.html";

    // true for opening webview links in external web browser rather than directly in the webview
    public static final boolean OPEN_LINKS_IN_EXTERNAL_broWSER = false;

    // rules for opening links in external browser,// if URL link contains the string,it will be opened in external browser,// these rules have higher priority than OPEN_LINKS_IN_EXTERNAL_broWSER option
    public static final String[] LINKS_OPENED_IN_EXTERNAL_broWSER = {
            "target=blank","target=external","play.google.com/store","youtube.com/watch","facebook.com/sharer","twitter.com/share","t.me"
    };

    // rules for opening links in internal webview,it will be loaded in internal webview,// these rules have higher priority than OPEN_LINKS_IN_EXTERNAL_broWSER option
    public static final String[] LINKS_OPENED_IN_INTERNAL_WEBVIEW = {
            "target=webview","target=internal"
    };

    // list of file extensions or expressions for download,// if webview URL matches with this regular expression,the file will be downloaded via download manager,// leave this array empty if you do not want to use download manager
    public static final String[] DOWNLOAD_FILE_TYPES = {
            ".*zip$",".*rar$",".*pdf$",".*doc$",".*xls$",".*mp3$",".*wma$",".*ogg$",".*m4a$",".*wav$",".*avi$",".*mov$",".*mp4$",".*mpg$",".*3gp$",".*drive.google.com.*file.*",".*dropBox.com/s/.*"
    };

    // debug logs,value is set via build config in build.gradle
    public static final boolean LOGS = BuildConfig.LOGS;

    // development environment,value is set via build config in build.gradle
    public static final boolean DEV_ENVIRONMENT = BuildConfig.DEV_ENVIRONMENT;

    // AdMob test ads,value is set via build config in build.gradle
    public static final boolean TEST_ADS = BuildConfig.TEST_ADS;
}

当我们打开应用程序时，它会显示用谷歌登录，当你点击它时，它会带你到谷歌登录用户名和密码页面..一旦你输入正确的详细信息并按登录，它就会显示空白的白屏...... 请帮忙..