NanoHTTPDemo/app/src/main/java/me/yoqi/android/nanohttpdemo/MainActivity.java

package me.yoqi.android.nanohttpdemo;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;

import me.yoqi.android.nanohttpdemo.service.LocalService;

public class MainActivity extends AppCompatActivity {
    Button btnStart;
    WebView webView;
    Context mContext;
    boolean flag = false; //按钮 httpd 状态

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = this;
        initView();
    }

    void initView() {
        btnStart = findViewById(R.id.btn_starthttpd);
        webView = findViewById(R.id.wv_main);
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);

//设置自适应屏幕，两者合用
        webSettings.setUseWideViewPort(true); //将图片调整到适合webview的大小
        webSettings.setLoadWithOverviewMode(true); // 缩放至屏幕的大小

//缩放操作
        webSettings.setSupportZoom(true); //支持缩放，默认为true。是下面那个的前提。
        webSettings.setBuiltInZoomControls(true); //设置内置的缩放控件。若为false，则该WebView不可缩放
        webSettings.setDisplayZoomControls(false); //隐藏原生的缩放控件

//其他细节操作
        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


        btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!flag) {
                    startHttpd();
                    flag = true;
                    btnStart.setText("已启动");
                    webView.loadUrl("http://localhost:7600");
                    webView.setWebViewClient(new WebViewClient() {
                        @Override
                        public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
                            return super.shouldOverrideUrlLoading(view, request);
                        }
                    });
                } else {
                    stopHttpd();
                    flag = false;
                    btnStart.setText("已关闭");
                }
            }
        });
    }

    void startHttpd() {
        Intent intent = new Intent(mContext, LocalService.class);
        startService(intent);
    }

    void stopHttpd() {
        Intent intent = new Intent(mContext, LocalService.class);
        stopService(intent);
    }
}