HelpActivity.java

package com.android.launcher3;

import android.os.Bundle;
import android.view.View;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ImageView;

import androidx.annotation.Nullable;

public class HelpActivity extends BaseActivity {

    ImageView back;
    WebView webView;

    String url;

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

        url = getIntent().getStringExtra("url");
        back = findViewById(R.id.iv_onback);
        webView = findViewById(R.id.webview);


        webView.setWebChromeClient(new WebChromeClient());

        webView.setWebViewClient(new WebViewClient() {

        });

        back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

        webView.loadUrl(url);
    }
}