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package com.some.some;
 
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
 
import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.Rect;
import android.graphics.drawable.ColorDrawable;
import android.location.LocationManager;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore;
import android.provider.Settings;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.webkit.DownloadListener;
import android.webkit.GeolocationPermissions;
import android.webkit.PermissionRequest;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ProgressBar;
import android.widget.Toast;
 
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
 
import android.app.DownloadManager;
 
public class MainActivity extends AppCompatActivity {
 
    private WebView webview;
    ProgressBar progressBar;
    ProgressBar progressBar2;
    AlertDialog alertDialog;
    private SwipeRefreshLayout swipeRefreshLayout;
 
    String appurl= "https://x...content-available-to-author-only...o.com/home.php";
    String TELPREFIX = "tel:";
 
    private ValueCallback<Uri> mUploadMessage;
    private final static int FILECHOOSER_RESULTCODE=1;
    public ValueCallback<Uri[]> uploadMessage;
    private int LOCATION_PERMISSION_CODE = 1;
 
 
 
    public static final int INPUT_FILE_REQUEST_CODE = 1;
    public static final String EXTRA_FROM_NOTIFICATION = "EXTRA_FROM_NOTIFICATION";
    private ValueCallback<Uri[]> mFilePathCallback;
    private String mCameraPhotoPath;
 
    private static final int PERMISSION_REQUEST_CODE = 200;
 
    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        View decor = getWindow().getDecorView();
        decor.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);//SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
 
        FullScreencall();
 
        try { trimCache(this); }
        catch (Exception e){ }
 
        webview=(WebView)findViewById(R.id.webView);
        progressBar=findViewById(R.id.progressBar);
//        swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
//        swipeRefreshLayout.setOnRefreshListener(MainActivity.this);
 
        //webview.setWebChromeClient(new CustomChrome());
        webview.setWebViewClient(new WebViewClient());
        WebSettings webSettings = webview.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setAllowFileAccess(true);
        webSettings.setAppCacheEnabled(true);
 
        webview.getSettings().setDomStorageEnabled(true);
        webview.getSettings().setJavaScriptEnabled(true);
        webSettings.setJavaScriptEnabled(true);
        webview.getSettings().setUserAgentString(webview.getSettings().getUserAgentString());
        //webview.getSettings().setUserAgentString(webview.getSettings().getUserAgentString().replace("; wv", ""));
        String MyUA = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 " +
                "(KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36";
        webview.getSettings().setUserAgentString(MyUA);
        // for mute or unmute sound
        webSettings.setMediaPlaybackRequiresUserGesture(false);
 
//        webview.setWebChromeClient(new WebChromeClient(){
//            @Override
//            public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
//                callback.invoke(origin, true, true);
//                super.onGeolocationPermissionsShowPrompt(origin, callback);
//            }
//
//            @Override
//            public void onPermissionRequest(PermissionRequest request) {
//                super.onPermissionRequest(request);
//                request.grant(request.getResources());
//
//            }
//
//            @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
//            public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams)
//            {
//                if (uploadMessage != null) {
//                    uploadMessage.onReceiveValue(null);
//                    uploadMessage = null;
//                }
//
//                uploadMessage = filePathCallback;
//
//                Intent intent = fileChooserParams.createIntent();
//                try
//                {
//                    startActivityForResult(intent, 100);
//                } catch (ActivityNotFoundException e)
//                {
//                    uploadMessage = null;
//                    Toast.makeText(getApplicationContext(), "Cannot Open File Chooser", Toast.LENGTH_LONG).show();
//                    return false;
//                }
//                return true;
//            }
//
//    });
//
 
 
        webview.getSettings().setSupportMultipleWindows(true);
 
 
        webview.setDownloadListener(new DownloadListener() {
 
            @Override
            public void onDownloadStart(String url, String userAgent,
                                        String contentDisposition, String mimetype,
                                        long contentLength) {
                DownloadManager.Request request = new DownloadManager.Request(
                        Uri.parse(url));
 
                request.allowScanningByMediaScanner();
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed!
                request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "Name of your downloadble file goes here, example: Mathematics II ");
                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                dm.enqueue(request);
                Toast.makeText(getApplicationContext(), "Downloading File", //To notify the Client that the file is being downloaded
                        Toast.LENGTH_LONG).show();
 
            }
        });
 
 
        webview.setWebChromeClient(new WebChromeClient() {
            @Override
            public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
                callback.invoke(origin, true, true);
                super.onGeolocationPermissionsShowPrompt(origin, callback);
            }
 
 
            @Override
            public void onPermissionRequest(PermissionRequest request) {
                super.onPermissionRequest(request);
                request.grant(request.getResources());
 
            }
 
//            @Override
//            public boolean onCreateWindow(WebView view, boolean isDialog, boolean isUserGesture, Message resultMsg) {
//                //return super.onCreateWindow(view, isDialog, isUserGesture, resultMsg);
//                WebView.HitTestResult result = view.getHitTestResult();
//                String data = result.getExtra();
//                Context context = view.getContext();
//                if (data != null && data.contains("_blanks")) {
//                    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(data));
//                    browserIntent.setPackage("com.android.chrome");
//                    Toast.makeText(context, "create", Toast.LENGTH_SHORT).show();
//                    context.startActivity(browserIntent);
//                    return false;
//                }
//                return false;
//            }
 
            public boolean onShowFileChooser(
                    WebView webView, ValueCallback<Uri[]> filePathCallback,
                    WebChromeClient.FileChooserParams fileChooserParams) {
                if(mFilePathCallback != null) {
                    mFilePathCallback.onReceiveValue(null);
                }
                mFilePathCallback = filePathCallback;
 
                Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
                    // Create the File where the photo should go
                    File photoFile = null;
                    try {
                        photoFile = createImageFile();
                        takePictureIntent.putExtra("PhotoPath", mCameraPhotoPath);
                    } catch (IOException ex) {
                        // Error occurred while creating the File
                        Log.e("TAG", "Unable to create Image File", ex);
                    }
 
                    // Continue only if the File was successfully created
                    if (photoFile != null) {
                        mCameraPhotoPath = "file:" + photoFile.getAbsolutePath();
                        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                                Uri.fromFile(photoFile));
                    } else {
                        takePictureIntent = null;
                    }
                }
 
                Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
                contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
                contentSelectionIntent.setType("image/*");
 
                Intent[] intentArray;
                if(takePictureIntent != null) {
                    intentArray = new Intent[]{takePictureIntent};
                } else {
                    intentArray = new Intent[0];
                }
 
                Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
                chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
                chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
                chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
 
                startActivityForResult(chooserIntent, INPUT_FILE_REQUEST_CODE);
 
                return true;
            }
        });
 
 
 
        if ( Build.VERSION.SDK_INT >= 23){
            if (ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION) !=
                    PackageManager.PERMISSION_GRANTED  ){
//                requestPermissions(new String[]{
//                                android.Manifest.permission.ACCESS_FINE_LOCATION},
//                        LOCATION_PERMISSION_CODE);
//                ActivityCompat.requestPermissions(MainActivity.this,
//                        new String[] {android.Manifest.permission.ACCESS_FINE_LOCATION}, LOCATION_PERMISSION_CODE);
 
                ActivityCompat.requestPermissions(MainActivity.this,
                        new String[] {android.Manifest.permission.ACCESS_FINE_LOCATION}, LOCATION_PERMISSION_CODE);
 
 
 
                //return ;
            } else {
                if (canGetLocation()) {
                    //DO SOMETHING USEFUL HERE. ALL GPS PROVIDERS ARE CURRENTLY ENABLED
                } else {
                    //SHOW OUR SETTINGS ALERT, AND LET THE USE TURN ON ALL THE GPS PROVIDERS
                    Intent intent = new Intent(
                            Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                    startActivity(intent);
                }
            }
        }
 
        //  checkPermission();
 
        if (isConnected()){
            progressBar.setVisibility(View.VISIBLE);
            loadWeburl(appurl);
        } else {
            Toast.makeText(MainActivity.this, "No internet connection", Toast.LENGTH_SHORT).show();
            noInternetAlertDialog();
        }
 
    }
 
 
    // hide botoom navigation bar buttons
    public void FullScreencall() {
        if(Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { // lower api
            View v = this.getWindow().getDecorView();
            v.setSystemUiVisibility(View.GONE);
        } else if(Build.VERSION.SDK_INT >= 19) {
            //for new api versions.
            View decorView = getWindow().getDecorView();
            int uiOptions =  View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;// View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR | // View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
            decorView.setSystemUiVisibility(uiOptions);
        }
    }
 
 
 
    //////////////////////////////////// check internet connection ////////////////////////////////////
    public boolean isConnected() {
        boolean connected = false;
        try {
            ConnectivityManager cm = (ConnectivityManager)getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo nInfo = cm.getActiveNetworkInfo();
            connected = nInfo != null && nInfo.isAvailable() && nInfo.isConnected();
            return connected;
        } catch (Exception e) {
            Log.e("Connectivity Exception", e.getMessage());
        }
        return connected;
    }
 
 
    //////////////////////////////////// load Web url ////////////////////////////////////
    private void loadWeburl(String url){
 
        webview.setWebViewClient(new WebViewClient() {
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
 
                Log.i("TAG", "Processing webview url click...");
                progressBar.setVisibility(View.VISIBLE);
                // stopping swipe refresh
                //  swipeRefreshLayout.setRefreshing(false);
                // view.loadUrl(url);
 
                try { trimCache(getApplicationContext()); }
                catch (Exception e){ }
 
                if (url != null && url.startsWith("whatsapp://")) {
                    view.getContext().startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
                    return true;
                } else if (url.startsWith(TELPREFIX)) {
                    Intent intent = new Intent(Intent.ACTION_DIAL);
                    intent.setData(Uri.parse(url));
                    startActivity(intent);
                    return true;
                } else {
                    view.loadUrl(url);
                    appurl = url;
                }
 
 
 
                return true;
            }
 
            public void onPageFinished(WebView view, String url) {
                Log.i("TAG", "Finished loading URL: " + url);
                // stopping swipe refresh
                // swipeRefreshLayout.setRefreshing(false);
                // webview.loadUrl("javascript:MyApp.resize(document.body.getBoundingClientRect().height)");
 
                progressBar.setVisibility(View.GONE);
            }
 
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                Log.e("TAG", "Error: " + description);
                //Toast.makeText(Main.this, "Oh no! " + description, Toast.LENGTH_SHORT).show();
                progressBar.setVisibility(View.GONE);
                // stopping swipe refresh
                // swipeRefreshLayout.setRefreshing(false);
                if (!isConnected()){
                    Toast.makeText(MainActivity.this, "No internet connection", Toast.LENGTH_SHORT).show();
                    noInternetAlertDialog();
 
                }
 
            }
        });
        webview.loadUrl(url);
 
    }
 
 
    //////////////////////////////////// View no Internet AlertDialog ////////////////////////////////////
    private void noInternetAlertDialog() {
 
 
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this).setCancelable(false);
        dialogBuilder.setView(R.layout.nointernet_view);
        alertDialog = dialogBuilder.create();
        alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        alertDialog.show();
 
        Button tryAgainBtn = alertDialog.findViewById(R.id.tryagainBtn);
        progressBar2 = alertDialog.findViewById(R.id.progressBar2);
        progressBar2.setVisibility(View.GONE);
        tryAgainBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                progressBar2.setVisibility(View.VISIBLE);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        if (isConnected()){
 
                            progressBar2.setVisibility(View.GONE);
                            alertDialog.dismiss();
                            progressBar.setVisibility(View.VISIBLE);
                            loadWeburl(appurl);
                        } else {
                            Toast.makeText(MainActivity.this, "No internet connection", Toast.LENGTH_SHORT).show();
                            progressBar2.setVisibility(View.GONE);
                            alertDialog.dismiss();
                            noInternetAlertDialog();
                        }
                    }
                }, 10000);
 
 
            }
        });
 
 
        // Creating Dynamic
        Rect displayRectangle = new Rect();
        DisplayMetrics displayMetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
        int widthLcl = (int) (displayMetrics.widthPixels*1f);
        int heightLcl = (int) (displayMetrics.heightPixels*1f);
 
        Window window = getWindow();
        window.getDecorView().getWindowVisibleDisplayFrame(displayRectangle);    //(displayRectangle.width() * 0.9f
        alertDialog.getWindow().setLayout((int) (widthLcl), heightLcl);  //alertDialog.getWindow().getAttributes().height
 
    }
 
//    @SuppressLint("MissingSuperCall")
//    @Override
//    protected void onActivityResult(int requestCode, int resultCode,
//                                    Intent intent) {
//
//        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
//            if (requestCode == 100) {
//                if (uploadMessage == null)
//                    return;
//                uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, intent));
//                uploadMessage = null;
//            }
//        } else if (requestCode == FILECHOOSER_RESULTCODE) {
//            if (null == mUploadMessage)
//                return;
//
//            Uri result = intent == null || resultCode != MainActivity.RESULT_OK ? null : intent.getData();
//            mUploadMessage.onReceiveValue(result);
//            mUploadMessage = null;
//        } else
//            Toast.makeText(getApplicationContext(), "Failed to Upload Image", Toast.LENGTH_LONG).show();
//    }
 
 
    @Override
    public void onActivityResult (int requestCode, int resultCode, Intent data) {
        if(requestCode != INPUT_FILE_REQUEST_CODE || mFilePathCallback == null) {
            super.onActivityResult(requestCode, resultCode, data);
            return;
        }
 
        Uri[] results = null;
 
        // Check that the response is a good one
        if(resultCode == Activity.RESULT_OK) {
            if(data == null) {
                // If there is not data, then we may have taken a photo
                if(mCameraPhotoPath != null) {
                    results = new Uri[]{Uri.parse(mCameraPhotoPath)};
                }
            } else {
                String dataString = data.getDataString();
                if (dataString != null) {
                    results = new Uri[]{Uri.parse(dataString)};
                }
            }
        }
 
        mFilePathCallback.onReceiveValue(results);
        mFilePathCallback = null;
        return;
    }
 
 
    @Override
    public void onBackPressed() {
        if (webview.canGoBack()) {
            webview.goBack();
        } else {
            super.onBackPressed();
            finish();
        }
    }
 
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        webview.saveState(outState);
    }
 
    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        webview.restoreState(savedInstanceState);
    }
 
    private class CustomChrome extends WebChromeClient {
        private View mCustomView;
        private WebChromeClient.CustomViewCallback mCustomViewCallback;
 
        //protected FrameLayout mFullscreenContainer;
        //private int mOriginalOrientation;
        private int mOriginalSystemUiVisibility;
 
        CustomChrome() {
        }
 
        public Bitmap getDefaultVideoPoster() {
            if (mCustomView == null) {
                return null;
            }
            return BitmapFactory.decodeResource(getApplicationContext().getResources(), 2130837573);
        }
 
        @SuppressLint("SourceLockedOrientationActivity")
        public void onHideCustomView() {
            ((FrameLayout) getWindow().getDecorView()).removeView(this.mCustomView);
            this.mCustomView = null;
            getWindow().getDecorView().setSystemUiVisibility(this.mOriginalSystemUiVisibility);
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            this.mCustomViewCallback.onCustomViewHidden();
            this.mCustomViewCallback = null;
        }
 
        @SuppressLint("SourceLockedOrientationActivity")
        public void onShowCustomView(View paramView, WebChromeClient.CustomViewCallback paramCustomViewCallback) {
            if (this.mCustomView != null) {
                onHideCustomView();
                return;
            }
            this.mCustomView = paramView;
            this.mOriginalSystemUiVisibility = getWindow().getDecorView().getSystemUiVisibility();
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            //this.mOriginalOrientation = getRequestedOrientation();
            this.mCustomViewCallback = paramCustomViewCallback;
            ((FrameLayout) getWindow().getDecorView()).addView(this.mCustomView, new FrameLayout.LayoutParams(-1, -1));
            getWindow().getDecorView().setSystemUiVisibility(3846);
        }
 
    }
 
 
 
 
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == LOCATION_PERMISSION_CODE) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Toast.makeText(this, "Permission GRANTED", Toast.LENGTH_SHORT).show();
                if (canGetLocation()) {
                    //DO SOMETHING USEFUL HERE. ALL GPS PROVIDERS ARE CURRENTLY ENABLED
//                    if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA)
//                            != PackageManager.PERMISSION_GRANTED) {
//                       //  Permission is not granted
//                        ActivityCompat.requestPermissions(this,
//                                new String[]{android.Manifest.permission.CAMERA},
//                                PERMISSION_REQUEST_CODE);
//
//                    }
                } else {
                    //SHOW OUR SETTINGS ALERT, AND LET THE USE TURN ON ALL THE GPS PROVIDERS
                    Intent intent = new Intent(
                            Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                    startActivity(intent);
                }
 
//                if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA)
//                        != PackageManager.PERMISSION_GRANTED) {
//                    // Permission is not granted
//                    ActivityCompat.requestPermissions(this,
//                            new String[]{android.Manifest.permission.CAMERA},
//                            PERMISSION_REQUEST_CODE);
//
//                }
//
//            } else {
//                // Toast.makeText(this, "Permission DENIED", Toast.LENGTH_SHORT).show();
            } else if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_DENIED){
                finish();
            }
        }
 
        if (requestCode == PERMISSION_REQUEST_CODE) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                //  Toast.makeText(getApplicationContext(), "Permission Granted", Toast.LENGTH_SHORT).show();
 
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                        != PackageManager.PERMISSION_GRANTED) {
                    // Permission is not granted
                    ActivityCompat.requestPermissions(this,
                            new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
                            LOCATION_PERMISSION_CODE);
                }
 
                // main logic
            } else {
                //Toast.makeText(getApplicationContext(), "Permission Denied", Toast.LENGTH_SHORT).show();
            }
        }
 
    }
 
    public boolean canGetLocation() {
        boolean result = true;
        LocationManager lm;
        boolean gpsEnabled = false;
        boolean networkEnabled = false;
 
        lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
 
        // exceptions will be thrown if provider is not permitted.
        try {
            gpsEnabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
        } catch (Exception ex) {
        }
 
        try {
            networkEnabled = lm
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        } catch (Exception ex) {
        }
 
        return gpsEnabled && networkEnabled;
    }
 
 
 
    private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES);
        File imageFile = File.createTempFile(
                imageFileName,  /* prefix */
                ".jpg",         /* suffix */
                storageDir      /* directory */
        );
        return imageFile;
    }
 
    private void checkPermission() {
 
        if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED) {
            // Permission is not granted
            ActivityCompat.requestPermissions(this,
                    new String[]{android.Manifest.permission.CAMERA},
                    PERMISSION_REQUEST_CODE);
 
        }
//        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
//                != PackageManager.PERMISSION_GRANTED) {
//            // Permission is not granted
//            ActivityCompat.requestPermissions(this,
//                    new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
//                    LOCATION_PERMISSION_CODE);
//
//        }
 
    }
 
    private void requestPermission() {
 
        ActivityCompat.requestPermissions(this,
                new String[]{android.Manifest.permission.CAMERA},
                PERMISSION_REQUEST_CODE);
    }
 
 
 
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        try { trimCache(this); }
        catch (Exception e){ }
 
    }
 
    public static boolean trimCache(Context context) {
        try {
            File dir = context.getCacheDir();
            if (dir != null && dir.isDirectory()) {
                return deleteDir(dir);
            }
        } catch (Exception e) {
            // TODO: handle exception
        }
        return false;
    }
 
    public static boolean deleteDir(File dir) {
        if (dir != null && dir.isDirectory()) {
            String[] children = dir.list();
            for (int i = 0; i < children.length; i++) {
                boolean success = deleteDir(new File(dir, children[i]));
                if (!success) {
                    return false;
                }
            }
        }
        // The directory is now empty so delete it
        return dir.delete();
    }
 
 
 
}

Main.java:56: error: class MainActivity is public, should be declared in a file named MainActivity.java
public class MainActivity extends AppCompatActivity {
       ^
Main.java:3: error: package androidx.annotation does not exist
import androidx.annotation.NonNull;
                          ^
Main.java:4: error: package androidx.appcompat.app does not exist
import androidx.appcompat.app.AppCompatActivity;
                             ^
Main.java:5: error: package androidx.core.app does not exist
import androidx.core.app.ActivityCompat;
                        ^
Main.java:6: error: package androidx.core.content does not exist
import androidx.core.content.ContextCompat;
                            ^
Main.java:7: error: package androidx.swiperefreshlayout.widget does not exist
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
                                         ^
Main.java:9: error: package android does not exist
import android.Manifest;
              ^
Main.java:10: error: package android.annotation does not exist
import android.annotation.SuppressLint;
                         ^
Main.java:11: error: package android.app does not exist
import android.app.Activity;
                  ^
Main.java:12: error: package android.app does not exist
import android.app.AlertDialog;
                  ^
Main.java:13: error: package android.content does not exist
import android.content.Context;
                      ^
Main.java:14: error: package android.content does not exist
import android.content.Intent;
                      ^
Main.java:15: error: package android.content.pm does not exist
import android.content.pm.ActivityInfo;
                         ^
Main.java:16: error: package android.content.pm does not exist
import android.content.pm.PackageManager;
                         ^
Main.java:17: error: package android.graphics does not exist
import android.graphics.Bitmap;
                       ^
Main.java:18: error: package android.graphics does not exist
import android.graphics.BitmapFactory;
                       ^
Main.java:19: error: package android.graphics does not exist
import android.graphics.Color;
                       ^
Main.java:20: error: package android.graphics does not exist
import android.graphics.Rect;
                       ^
Main.java:21: error: package android.graphics.drawable does not exist
import android.graphics.drawable.ColorDrawable;
                                ^
Main.java:22: error: package android.location does not exist
import android.location.LocationManager;
                       ^
Main.java:23: error: package android.net does not exist
import android.net.ConnectivityManager;
                  ^
Main.java:24: error: package android.net does not exist
import android.net.NetworkInfo;
                  ^
Main.java:25: error: package android.net does not exist
import android.net.Uri;
                  ^
Main.java:26: error: package android.os does not exist
import android.os.Build;
                 ^
Main.java:27: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:28: error: package android.os does not exist
import android.os.Environment;
                 ^
Main.java:29: error: package android.os does not exist
import android.os.Handler;
                 ^
Main.java:30: error: package android.provider does not exist
import android.provider.MediaStore;
                       ^
Main.java:31: error: package android.provider does not exist
import android.provider.Settings;
                       ^
Main.java:32: error: package android.util does not exist
import android.util.DisplayMetrics;
                   ^
Main.java:33: error: package android.util does not exist
import android.util.Log;
                   ^
Main.java:34: error: package android.view does not exist
import android.view.View;
                   ^
Main.java:35: error: package android.view does not exist
import android.view.Window;
                   ^
Main.java:36: error: package android.webkit does not exist
import android.webkit.DownloadListener;
                     ^
Main.java:37: error: package android.webkit does not exist
import android.webkit.GeolocationPermissions;
                     ^
Main.java:38: error: package android.webkit does not exist
import android.webkit.PermissionRequest;
                     ^
Main.java:39: error: package android.webkit does not exist
import android.webkit.ValueCallback;
                     ^
Main.java:40: error: package android.webkit does not exist
import android.webkit.WebChromeClient;
                     ^
Main.java:41: error: package android.webkit does not exist
import android.webkit.WebSettings;
                     ^
Main.java:42: error: package android.webkit does not exist
import android.webkit.WebView;
                     ^
Main.java:43: error: package android.webkit does not exist
import android.webkit.WebViewClient;
                     ^
Main.java:44: error: package android.widget does not exist
import android.widget.Button;
                     ^
Main.java:45: error: package android.widget does not exist
import android.widget.FrameLayout;
                     ^
Main.java:46: error: package android.widget does not exist
import android.widget.ProgressBar;
                     ^
Main.java:47: error: package android.widget does not exist
import android.widget.Toast;
                     ^
Main.java:54: error: package android.app does not exist
import android.app.DownloadManager;
                  ^
Main.java:56: error: cannot find symbol
public class MainActivity extends AppCompatActivity {
                                  ^
  symbol: class AppCompatActivity
Main.java:58: error: cannot find symbol
    private WebView webview;
            ^
  symbol:   class WebView
  location: class MainActivity
Main.java:59: error: cannot find symbol
    ProgressBar progressBar;
    ^
  symbol:   class ProgressBar
  location: class MainActivity
Main.java:60: error: cannot find symbol
    ProgressBar progressBar2;
    ^
  symbol:   class ProgressBar
  location: class MainActivity
Main.java:61: error: cannot find symbol
    AlertDialog alertDialog;
    ^
  symbol:   class AlertDialog
  location: class MainActivity
Main.java:62: error: cannot find symbol
    private SwipeRefreshLayout swipeRefreshLayout;
            ^
  symbol:   class SwipeRefreshLayout
  location: class MainActivity
Main.java:67: error: cannot find symbol
    private ValueCallback<Uri> mUploadMessage;
            ^
  symbol:   class ValueCallback
  location: class MainActivity
Main.java:67: error: cannot find symbol
    private ValueCallback<Uri> mUploadMessage;
                          ^
  symbol:   class Uri
  location: class MainActivity
Main.java:69: error: cannot find symbol
    public ValueCallback<Uri[]> uploadMessage;
           ^
  symbol:   class ValueCallback
  location: class MainActivity
Main.java:69: error: cannot find symbol
    public ValueCallback<Uri[]> uploadMessage;
                         ^
  symbol:   class Uri
  location: class MainActivity
Main.java:76: error: cannot find symbol
    private ValueCallback<Uri[]> mFilePathCallback;
            ^
  symbol:   class ValueCallback
  location: class MainActivity
Main.java:76: error: cannot find symbol
    private ValueCallback<Uri[]> mFilePathCallback;
                          ^
  symbol:   class Uri
  location: class MainActivity
Main.java:83: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class MainActivity
Main.java:476: error: cannot find symbol
    public void onActivityResult (int requestCode, int resultCode, Intent data) {
                                                                   ^
  symbol:   class Intent
  location: class MainActivity
Main.java:516: error: cannot find symbol
    protected void onSaveInstanceState(Bundle outState) {
                                       ^
  symbol:   class Bundle
  location: class MainActivity
Main.java:522: error: cannot find symbol
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
                                          ^
  symbol:   class Bundle
  location: class MainActivity
Main.java:712: error: cannot find symbol
    public static boolean trimCache(Context context) {
                                    ^
  symbol:   class Context
  location: class MainActivity
Main.java:527: error: cannot find symbol
    private class CustomChrome extends WebChromeClient {
                                       ^
  symbol:   class WebChromeClient
  location: class MainActivity
Main.java:528: error: cannot find symbol
        private View mCustomView;
                ^
  symbol:   class View
  location: class MainActivity.CustomChrome
Main.java:529: error: package WebChromeClient does not exist
        private WebChromeClient.CustomViewCallback mCustomViewCallback;
                               ^
Main.java:538: error: cannot find symbol
        public Bitmap getDefaultVideoPoster() {
               ^
  symbol:   class Bitmap
  location: class MainActivity.CustomChrome
Main.java:556: error: cannot find symbol
        public void onShowCustomView(View paramView, WebChromeClient.CustomViewCallback paramCustomViewCallback) {
                                     ^
  symbol:   class View
  location: class MainActivity.CustomChrome
Main.java:556: error: package WebChromeClient does not exist
        public void onShowCustomView(View paramView, WebChromeClient.CustomViewCallback paramCustomViewCallback) {
                                                                    ^
Main.java:81: error: cannot find symbol
    @SuppressLint("SetJavaScriptEnabled")
     ^
  symbol:   class SuppressLint
  location: class MainActivity
Main.java:576: error: cannot find symbol
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
                                                             ^
  symbol:   class NonNull
  location: class MainActivity
Main.java:576: error: cannot find symbol
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
                                                                                            ^
  symbol:   class NonNull
  location: class MainActivity
Main.java:545: error: cannot find symbol
        @SuppressLint("SourceLockedOrientationActivity")
         ^
  symbol:   class SuppressLint
  location: class MainActivity.CustomChrome
Main.java:555: error: cannot find symbol
        @SuppressLint("SourceLockedOrientationActivity")
         ^
  symbol:   class SuppressLint
  location: class MainActivity.CustomChrome
Main.java:82: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:84: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class MainActivity
Main.java:85: error: package R does not exist
        setContentView(R.layout.activity_main);
                        ^
Main.java:86: error: cannot find symbol
        View decor = getWindow().getDecorView();
        ^
  symbol:   class View
  location: class MainActivity
Main.java:86: error: cannot find symbol
        View decor = getWindow().getDecorView();
                     ^
  symbol:   method getWindow()
  location: class MainActivity
Main.java:87: error: cannot find symbol
        decor.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);//SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
                                    ^
  symbol:   variable View
  location: class MainActivity
Main.java:94: error: cannot find symbol
        webview=(WebView)findViewById(R.id.webView);
                 ^
  symbol:   class WebView
  location: class MainActivity
Main.java:94: error: package R does not exist
        webview=(WebView)findViewById(R.id.webView);
                                       ^
Main.java:95: error: package R does not exist
        progressBar=findViewById(R.id.progressBar);
                                  ^
Main.java:100: error: cannot find symbol
        webview.setWebViewClient(new WebViewClient());
                                     ^
  symbol:   class WebViewClient
  location: class MainActivity
Main.java:101: error: cannot find symbol
        WebSettings webSettings = webview.getSettings();
        ^
  symbol:   class WebSettings
  location: class MainActivity
Main.java:161: error: cannot find symbol
        webview.setDownloadListener(new DownloadListener() {
                                        ^
  symbol:   class DownloadListener
  location: class MainActivity
Main.java:163: error: method does not override or implement a method from a supertype
            @Override
            ^
Main.java:167: error: package DownloadManager does not exist
                DownloadManager.Request request = new DownloadManager.Request(
                               ^
Main.java:167: error: package DownloadManager does not exist
                DownloadManager.Request request = new DownloadManager.Request(
                                                                     ^
Main.java:168: error: cannot find symbol
                        Uri.parse(url));
                        ^
  symbol: variable Uri
Main.java:171: error: package DownloadManager does not exist
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed!
                                                                 ^
Main.java:172: error: cannot find symbol
                request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "Name of your downloadble file goes here, example: Mathematics II ");
                                                          ^
  symbol: variable Environment
Main.java:173: error: cannot find symbol
                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                ^
  symbol: class DownloadManager
Main.java:173: error: cannot find symbol
                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                                      ^
  symbol: class DownloadManager
Main.java:173: error: cannot find symbol
                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                                                                        ^
  symbol: variable DOWNLOAD_SERVICE
Main.java:176: error: cannot find symbol
                        Toast.LENGTH_LONG).show();
                        ^
  symbol: variable Toast
Main.java:175: error: cannot find symbol
                Toast.makeText(getApplicationContext(), "Downloading File", //To notify the Client that the file is being downloaded
                ^
  symbol: variable Toast
Main.java:175: error: cannot find symbol
                Toast.makeText(getApplicationContext(), "Downloading File", //To notify the Client that the file is being downloaded
                               ^
  symbol: method getApplicationContext()
Main.java:182: error: cannot find symbol
        webview.setWebChromeClient(new WebChromeClient() {
                                       ^
  symbol:   class WebChromeClient
  location: class MainActivity
Main.java:184: error: package GeolocationPermissions does not exist
            public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
                                                                                                ^
100 errors

Standard output is empty