Uploading file using Android web View App Error at MainActivity.java

Question

I m trying to create an webapp with file upload possibility.

I have gone through some queries listed in StackOverflow as well for solution no this like

File Upload in WebView

However when applied the same in my mainactivity, couldn't resolve some errors showing with red underlines.

Here's my MainActivity.java:

package com.pack.packname;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;


import android.widget.Toast;
import android.os.Handler;


public class MainActivity extends AppCompatActivity {

    private WebView webView;

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

        webView = findViewById(R.id.webviewid);
        webView.setWebViewClient(new WebViewClient());
        webView.loadUrl("http://google.com/");

                webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        webView.getSettings().setDomStorageEnabled(true);
    }





    private boolean doubleBackToExitPressedOnce = false;

    @Override
    protected void onResume() {
        super.onResume();
        // .... other stuff in my onResume ....
        this.doubleBackToExitPressedOnce = false;
    }

    @Override
    public void onBackPressed() {
        if (doubleBackToExitPressedOnce) {
            super.onBackPressed();
            return;
        }

        if(webView.canGoBack()){
            webView.goBack();
        }

        this.doubleBackToExitPressedOnce = true;
        Toast.makeText(this, "Press again to exit", Toast.LENGTH_SHORT).show();

        new Handler().postDelayed(new Runnable() {

            @Override
            public void run() {
                doubleBackToExitPressedOnce=false;
            }
        }, 2000);
    }


    public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
        protected class CustomWebChromeClient extends WebChromeClient {
            // For Android 3.0+
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
                context.mUploadMessage = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("image/*");
                context.startActivityForResult(Intent.createChooser(i, "File Chooser"), MainActivity.FILECHOOSER_RESULTCODE);
            }

            // For Android < 3.0
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                openFileChooser(uploadMsg, "");
            }
        }
    }

}

I have added an image as well to check the errors that are causing as well.

Any help is greatly appreciated..

Answer 1

package com.pack.packname;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;


import android.widget.Toast;
import android.os.Handler;


public class MainActivity extends AppCompatActivity {
    private static final int REQUEST_SELECT_FILE = 100;
    private final static int FILE_CHOOSER_RESULT_CODE = 1;
    private ValueCallback<Uri> mUploadMessage;
    private ValueCallback<Uri[]> uploadMessage;
    private WebView webView;

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

        webView = findViewById(R.id.webviewid);
        webView.setWebViewClient(new WebViewClient());
        webView.loadUrl("http://google.com/");
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        webView.getSettings().setDomStorageEnabled(true);
webView..setWebChromeClient(new WebChromeClient() {
           @TargetApi(Build.VERSION_CODES.LOLLIPOP)
            public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
                if (uploadMessage != null) {
                    uploadMessage.onReceiveValue(null);
                    uploadMessage = null;
                }
                uploadMessage = filePathCallback;
                Intent intent = fileChooserParams.createIntent();
                try {
                    startActivityForResult(intent, REQUEST_SELECT_FILE);
                } catch (ActivityNotFoundException e) {
                    uploadMessage = null;
                    Toast.makeText(getApplicationContext(), "Cannot Open File Chooser", Toast.LENGTH_LONG).show();
                    return false;
                }
                return true;
            }
        });
    }

    private boolean doubleBackToExitPressedOnce = false;

    @Override
    protected void onResume() {
        super.onResume();
        // .... other stuff in my onResume ....
        this.doubleBackToExitPressedOnce = false;
    }

    @Override
    public void onBackPressed() {
        if (doubleBackToExitPressedOnce) {
            super.onBackPressed();
            return;
        }

        if(webView.canGoBack()){
            webView.goBack();
        }

        this.doubleBackToExitPressedOnce = true;
        Toast.makeText(this, "Press again to exit", Toast.LENGTH_SHORT).show();

        new Handler().postDelayed(new Runnable() {

            @Override
            public void run() {
                doubleBackToExitPressedOnce=false;
            }
        }, 2000);
    }

           
        
    

}

try this code