Android WebView First Project

import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends AppCompatActivity {

    private WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // requestWindowFeature(Window.FEATURE_NO_TITLE); //隐藏标题栏
        setContentView(R.layout.activity_main);

        //ActionBar: https://blog.csdn.net/qq_42018605/article/details/105890115
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.hide();
        }

        // 修改状态栏背景颜色
        Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
        // window.setStatusBarColor(Color.parseColor("#ffffff"));
        window.setStatusBarColor(Color.TRANSPARENT);

        // 设置状态栏字体颜色
        View stateView = getWindow().getDecorView();
        if (stateView != null) {
            int vis = stateView.getSystemUiVisibility();
            vis |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR; //黑色
            //vis &= ~View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;  //白色
            stateView.setSystemUiVisibility(vis);
        }

        // getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        //         WindowManager.LayoutParams.FLAG_FULLSCREEN); //隐藏状态栏

        webView = (WebView) findViewById(R.id.wv_webview);

        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        webSettings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK); //关闭webview中缓存
        webSettings.setAllowFileAccess(true); //设置可以访问文件
        webSettings.setJavaScriptCanOpenWindowsAutomatically(true); //支持通过JS打开新窗口
        webSettings.setLoadsImagesAutomatically(true); //支持自动加载图片
        webSettings.setDefaultTextEncodingName("utf-8");//设置编码格式

        webView.loadUrl("https://jxva.com");
        webView.setWebViewClient(new WebViewClient() {

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                    view.loadUrl(request.getUrl().toString());
                } else {
                    view.loadUrl(request.toString());
                }
                return true;
            }

            @Override
            public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
                switch (error.getErrorCode()) {
                    case 404:
                        view.loadUrl("file:///android_assets/404.html");
                        break;
                    default:
                        view.loadUrl("file:///android_assets/50x.html");
                        break;
                }

            }

            /*
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            } */
        });

        webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public void onReceivedTitle(WebView view, String title) {
                //   actionBar.setTitle(title);
            }
        });
    }

    //点击返回上一页面而不是退出浏览器
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()) {
            webView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    //销毁Webview
    @Override
    protected void onDestroy() {
        if (webView != null) {
            webView.loadDataWithBaseURL(null, "", "text/html", "utf-8", null);
            webView.clearHistory();
            ((ViewGroup) webView.getParent()).removeView(webView);
            webView.destroy();
            webView = null;
        }
        super.onDestroy();
    }

}

AndroidManifest.xml

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

activity_main.xml

 <WebView
        android:id="@+id/wv_webview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />