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

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="打电话"
        />
    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="发短信"
        />

</LinearLayout>

package com.example.myintentii;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button1 = (Button)findViewById(R.id.button1);
        Button button2 = (Button)findViewById(R.id.button2);
        //设置监听器对象
        button1.setOnClickListener(listener);
        button2.setOnClickListener(listener);
    }

    View.OnClickListener listener = new View.OnClickListener() {
        @Override//点了一下按钮的监听器
        public void onClick(View v) {
            Intent intent = new Intent();
            Button button = (Button)v;
            switch (button.getId()){
                case R.id.button1:  //打电话
                    intent.setAction(intent.ACTION_DIAL);//设置打电话ACTION
                    intent.setData(Uri.parse("tel:00000000"));//设置电话号
                    startActivity(intent);
                    break;
                case R.id.button2:  //发短信
                    intent.setAction(intent.ACTION_SENDTO);
                    intent.setData(Uri.parse("smsto:11111111"));
                    intent.putExtra("sms_body","Hello world");//编辑短信内容
                    startActivity(intent);
                    break;
            }
        }
    };
}