Android App 打开 H5 页面（使用 Android WebView 打开网址） 代码示例

activity_main.xml

MainActivity.java

package com.example.visualizedh5app;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.wang.avi.AVLoadingIndicatorView;



public class MainActivity extends AppCompatActivity {
    private WebView webView;
    private boolean isSuccess = false;
    private boolean isError = false;
    private Button tab1buttonConnect;
    private LinearLayout main;
    public EditText ip;
    private SharedPreferences mSps;
    private AVLoadingIndicatorView avi;
    private long time =0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        avi = (AVLoadingIndicatorView) findViewById(R.id.load);
        avi.hide();
        tab1buttonConnect = (Button) findViewById(R.id.tab1buttonConnect);
        main = (LinearLayout) findViewById(R.id.main);
        ip = (EditText) findViewById(R.id.tab1editTextIP);
        mSps = MainActivity.this.getSharedPreferences("share", MODE_PRIVATE);
        String strIp = mSps.getString("ip", "192.168.1.12");
        ip.setText(strIp);
        ip.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
            }
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                                          int after) {
            }
            @Override
            public void afterTextChanged(Editable s) {
                SharedPreferences.Editor editor = mSps.edit();
                editor.putString("ip", ip.getText().toString());
                editor.commit();
            }
        });


        //连接按钮点击事件
        tab1buttonConnect.setonClickListener(new View.onClickListener() {
            @Override
            public void onClick(View v) {
                main.setVisibility(View.GONE);//隐藏
                //main.setVisibility(View.VISIBLE);显示
                avi.show();
                String url = "http://" + ip.getText().toString();
                System.out.println("--------------" + url);
                setUpView(url);
                //加载h5页面结束
            }
        });
    }


    @SuppressLint("SetJavascriptEnabled")
    public void setUpView(String url) {
        //加载需要显示的网页
        webView = new WebView(this);
        WebSettings webSettings = webView.getSettings();
        webView.loadUrl(url);
        webSettings.setJavascriptEnabled(true);  //设置WebView属性,运行执行js脚本
        webSettings.setDomStorageEnabled(true);
        webSettings.setUseWideViewPort(true);//设定支持viewport
        webSettings.setLoadWithOverviewMode(true);   //自适应屏幕
        webSettings.setBuiltInZoomControls(true);
        webSettings.setDisplayZoomControls(false);
        webSettings.setSupportZoom(true);//设定支持缩放
        webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);//不读取缓存     
    webView.setBackgroundColor(ContextCompat.getColor(this,android.R.color.transparent));
        webView.setBackgroundResource(R.color.black);
        webView.setWebViewClient(webClient);  //设置Web视图
    }

    //        webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);不读取缓存
    WebViewClient webClient = new WebViewClient() {
        //设置打开网页时，不调用系统浏览器进行打开，而是在本WebView中直接显示。
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
//            Toast.makeText(MainActivity.this, "开始加载", Toast.LENGTH_SHORT).show();
            return true;
        }

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
        }

        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);
            if (!isError) {
                isSuccess = true;
                System.out.println("网页打开成功");
                setContentView(webView);
                //回调成功后的相关操作
            } else {
                isSuccess = false;
                System.out.println("网页打开失败");
                startActivity(new Intent(MainActivity.this, MainActivity.class));// 留在当前页面
                Toast.makeText(MainActivity.this, "提示：连接失败，请检查地址及网络设置后重试。", Toast.LENGTH_LONG).show();
            }
            avi.hide();
        }

        public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
            super.onReceivedError(view, request, error);
            isError = true;
            System.out.println("网页回调失败");
            //回调失败的相关操作
        }
    };

    
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if ((System.currentTimeMillis() - time > 1000)) {
                if(isSuccess){
                    Toast.makeText(this, "再按一次断开连接并返回连接页面", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();
                }
                time = System.currentTimeMillis();
            } else {
                if(isSuccess){
                    webView.destroy();
                    startActivity(new Intent(MainActivity.this, MainActivity.class));
                } else {
//                    finish();
                    Intent intent = new Intent(Intent.ACTION_MAIN);
                    intent.addCategory(Intent.CATEGORY_HOME);
                    startActivity(intent);
                }
            }
            return true;
        } else {
            return super.onKeyDown(keyCode, event);
        }

    }
}

AndroidManifest.xml

https://blog.csdn.net/weixin_40438421/article/details/85700109