android应用发短信

首选在AndroidManifest.xml 申请权限

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

SMSActivity.java

package com.example.a20200712;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import java.util.ArrayList;

public class SMSActivity extends AppCompatActivity {

    private static final int SEND_SMS = 100;

    private EditText sms_layout_content;
    private EditText sms_layout_number;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sms_layout);
        sms_layout_number = findViewById(R.id.sms_layout_number);
        sms_layout_content = findViewById(R.id.sms_layout_content);
    }

    public void sendBtn(View view) {
        //判断Android版本是否大于23
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            int checkCallPhonePermission = ContextCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE);
            if (checkCallPhonePermission != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.SEND_SMS}, SEND_SMS);
                return;
            } else {
                sendSMSS();
                //已有权限
            }
        } else {
            //API 版本在23以下
        }


    }



    /**
     * 注册权限申请回调
     *
     * @param requestCode  申请码
     * @param permissions  申请的权限
     * @param grantResults 结果
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case SEND_SMS:
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    sendSMSS();
                } else {
                    // Permission Denied
                    Toast.makeText(SMSActivity.this, "CALL_PHONE Denied", Toast.LENGTH_SHORT).show();
                }
                break;
            default:
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }



    //发送短信
    private void sendSMSS() {

        String content = sms_layout_content.getText().toString().trim();
        String phone = sms_layout_number.getText().toString().trim();
        if (!TextUtils.isEmpty(content) && !TextUtils.isEmpty(phone)) {
            SmsManager manager = SmsManager.getDefault();
            ArrayList<String> strings = manager.divideMessage(content);
            for (int i = 0; i < strings.size(); i++) {
                manager.sendTextMessage(phone, null, content, null, null);
            }
            Toast.makeText(SMSActivity.this, "发送成功", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "手机号或内容不能为空", Toast.LENGTH_SHORT).show();
        }

    }

}

sms_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:id="@+id/sms_layout_number"
        android:hint="请输入手机号">
    </EditText>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/sms_layout_content"
        android:inputType="textMultiLine"
        android:minLines="7"
        android:hint="短信内容">
    </EditText>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:onClick="sendBtn"
        android:text="发送短信"></Button>

</LinearLayout>