一：布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android/apk/res/android"
    xmlns:tools="http://schemas.android/tools"
    xmlns:app="http://schemas.android/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".UrlActivity"
    android:gravity="center">

  <Button
      android:id="@+id/btn"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="打开百度"/>
</LinearLayout>

二：调用

package com.example.demo;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Toast;

public class UrlActivity extends AppCompatActivity implements View.OnClickListener {
    private Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_url);

        btn = findViewById(R.id.btn);
        btn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn:
                try {
                    // 核心代码
                    Uri uri = Uri.parse("https://www.baidu");
                    Intent intent = new Intent(Intent.ACTION_VIEW, uri);
                    startActivity(intent);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                break;
            default:
                break;
        }
    }
}

一：布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android/apk/res/android"
    xmlns:tools="http://schemas.android/tools"
    xmlns:app="http://schemas.android/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".UrlActivity"
    android:gravity="center">

  <Button
      android:id="@+id/btn"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="打开百度"/>
</LinearLayout>

二：调用

package com.example.demo;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Toast;

public class UrlActivity extends AppCompatActivity implements View.OnClickListener {
    private Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_url);

        btn = findViewById(R.id.btn);
        btn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn:
                try {
                    // 核心代码
                    Uri uri = Uri.parse("https://www.baidu");
                    Intent intent = new Intent(Intent.ACTION_VIEW, uri);
                    startActivity(intent);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                break;
            default:
                break;
        }
    }
}