проблема, когда мое приложение android-tv webview открывается в симуляторе, оно закрывается в одиночку

Question

У меня проблема уже несколько дней.Мое приложение для Android-TV закрывает WebView.он открывает SplashScreen, но когда он входит в MainActivity, который закрывает код WebView, кто-то может мне помочь, пожалуйста.если вы можете прислать мне учебник WebView для Android-TV.

Я использую Android Studio

здесь 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"
    package="com.bartelegacorp.testetv">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <uses-feature
        android:name="android.hardware.touchscreen"
        android:required="false" />
    <uses-feature
        android:name="android.software.leanback"
        android:required="true" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        tools:ignore="GoogleAppIndexingWarning"
        android:banner="@drawable/app_icon_your_company">

        <activity android:name=".Splashscreen"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name=".MainActivity"
            android:banner="@drawable/app_icon_your_company"
            android:icon="@drawable/app_icon_your_company"
            android:label="@string/app_name"
            android:logo="@drawable/app_icon_your_company"
            android:screenOrientation="landscape"
            android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Вот MainActivity.java

    package com.bartelegacorp.testetv;

        import android.annotation.SuppressLint;
        import android.content.Context;
        import android.content.res.Configuration;
        import android.graphics.Bitmap;
        import android.graphics.BitmapFactory;
        import android.net.ConnectivityManager;
        import android.net.NetworkInfo;
        import android.os.Bundle;
        import android.support.v7.app.AppCompatActivity;
        import android.view.View;
        import android.webkit.WebChromeClient;
        import android.webkit.WebSettings;
        import android.webkit.WebView;
        import android.webkit.WebViewClient;
        import android.widget.FrameLayout;
        import android.widget.ProgressBar;

    public class MainActivity extends AppCompatActivity {

        WebView mWebView;
        ProgressBar progressBar;

        @SuppressLint("SetJavaScriptEnabled")
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            progressBar = findViewById(R.id.progressbar);
            mWebView = findViewById(R.id.webView);

            progressBar.setVisibility(View.VISIBLE);
            mWebView.setWebViewClient(new Browser_home());
            mWebView.setWebChromeClient(new MyChrome());
            WebSettings webSettings = mWebView.getSettings();
            webSettings.setJavaScriptEnabled(true);
            webSettings.setAllowFileAccess(true);
            webSettings.setAppCacheEnabled(true);


            if(savedInstanceState==null){
                mWebView.post(new Runnable() {
                    @Override
                    public void run() {
                        loadWebsite();
                    }
                });
            }
        }

        @Override
        public void onConfigurationChanged(Configuration newConfig) {
            super.onConfigurationChanged(newConfig);
        }

        @Override
        protected void onSaveInstanceState(Bundle outState )
        {
            super.onSaveInstanceState(outState);
            mWebView.saveState(outState);
        }

        @Override
        protected void onRestoreInstanceState(Bundle savedInstanceState)
        {
            super.onRestoreInstanceState(savedInstanceState);
            mWebView.restoreState(savedInstanceState);
        }

        private void loadWebsite() {
            ConnectivityManager cm = (ConnectivityManager) getApplication().getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo netInfo = cm.getActiveNetworkInfo();
            if (netInfo != null && netInfo.isConnectedOrConnecting()) {
                mWebView.loadUrl("https://www.novatvvale.com/mobile");
            } else {
                mWebView.setVisibility(View.GONE);
            }
        }

        class Browser_home extends WebViewClient {

            Browser_home() {
            }

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

            }

            @Override
            public void onPageFinished(WebView view, String url) {
                setTitle(view.getTitle());
                progressBar.setVisibility(View.GONE);
                super.onPageFinished(view, url);

            }
        }

        private class MyChrome extends WebChromeClient {

            private View mCustomView;
            private WebChromeClient.CustomViewCallback mCustomViewCallback;
            private int mOriginalOrientation;
            private int mOriginalSystemUiVisibility;

            MyChrome() {}

            public Bitmap getDefaultVideoPoster()
            {
                if (mCustomView == null) {
                    return null;
                }
                return BitmapFactory.decodeResource(getApplicationContext().getResources(), 2130837573);
            }

            public void onHideCustomView()
            {
                ((FrameLayout)getWindow().getDecorView()).removeView(this.mCustomView);
                this.mCustomView = null;
                getWindow().getDecorView().setSystemUiVisibility(this.mOriginalSystemUiVisibility);
                setRequestedOrientation(this.mOriginalOrientation);
                this.mCustomViewCallback.onCustomViewHidden();
                this.mCustomViewCallback = null;
            }

            public void onShowCustomView(View paramView, WebChromeClient.CustomViewCallback paramCustomViewCallback)
            {
                if (this.mCustomView != null)
                {
                    onHideCustomView();
                    return;
                }
                this.mCustomView = paramView;
                this.mOriginalSystemUiVisibility = getWindow().getDecorView().getSystemUiVisibility();
                this.mOriginalOrientation = getRequestedOrientation();
                this.mCustomViewCallback = paramCustomViewCallback;
                ((FrameLayout)getWindow().getDecorView()).addView(this.mCustomView, new FrameLayout.LayoutParams(-1, -1));
                getWindow().getDecorView().setSystemUiVisibility(3846);
            }
        }
    }

здесь - activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <WebView
        android:id="@+id/webView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true" />
    <ProgressBar
        android:id="@+id/progressbar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"/>
</RelativeLayout>