编程建立一个短信发送界面。提供输入手机号码和短信内容，利用系统服务，
发送短信内容到另一个模拟器。

效果：

 

代码

布局文件

<?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">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="请输入手机号"
        android:id="@+id/text"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/edit"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="请输入短信内容"
        android:id="@+id/text1"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/edit1"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="发送"
        android:id="@+id/button"/>

</LinearLayout>

activity文件

package com.example.lab4exam02;

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

import android.Manifest;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private Button mButton1;
    private EditText mEditText1;
    private EditText mEditText2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        /*ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.SEND_SMS} , 1);*/
        checkPermission();
            //获取资源
            mEditText1 = (EditText)findViewById(R.id.edit);
            mEditText2 = (EditText)findViewById(R.id.edit1);
            mButton1 = (Button)findViewById(R.id.button);
            //发送短信的响应
            mButton1.setOnClickListener(new Button.OnClickListener(){

                public void onClick(View v) {
                    //获取发送地址和发送内容
                    String messageAddress = mEditText1.getText().toString();
                    String messageContent = mEditText2.getText().toString();

                    //构建一取得default instance的SmsManager对象

                    SmsManager smsManager = SmsManager.getDefault();
                    //检查输入内容是否为空,这里为了简单就没有判断是否是号码,短信内容长度的限制也没有做
                    if(messageAddress.trim().length()!=0 && messageContent.trim().length()!=0)
                    {
                        //设置短信长度
                        if(messageContent.length() > 70){
                            ArrayList<String> texts=smsManager.divideMessage(messageContent);
                            for (String text:texts){
                                smsManager.sendTextMessage(messageAddress, null, text, null, null);
                            }
                        }else {
                            smsManager.sendTextMessage(messageAddress, null, messageContent, null, null);
                        }



                        //提示发送成功
                        Toast.makeText(MainActivity.this, "发送成功", Toast.LENGTH_LONG).show();
                    }
                    else{
                        Toast.makeText(MainActivity.this, "发送地址或者内容不能为空", Toast.LENGTH_SHORT).show();
                    }
                }

            });
    }

    String[] permissions = new String[]{Manifest.permission.SEND_SMS};
    List<String> mPermissionList = new ArrayList<>();

    // private ImageView welcomeImg = null;
    private static final int PERMISSION_REQUEST = 1;

// 检查权限

    private void checkPermission() {
        mPermissionList.clear();
        //判断哪些权限未授予
        for (int i = 0; i < permissions.length; i++) {
            if (ContextCompat.checkSelfPermission(this, permissions[i]) != PackageManager.PERMISSION_GRANTED) {
                mPermissionList.add(permissions[i]);
            }
        }
        /**
         * 判断是否为空
         */
        if (mPermissionList.isEmpty()) {//未授予的权限为空，表示都授予了
        } else {//请求权限方法
            String[] permissions = mPermissionList.toArray(new String[mPermissionList.size()]);//将List转为数组
            ActivityCompat.requestPermissions(this, permissions, PERMISSION_REQUEST);
        }
    }

    /**
     * 响应授权
     * 这里不管用户是否拒绝，都进入首页，不再重复申请权限
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case PERMISSION_REQUEST:
                break;
            default:
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);
                break;
        }
    }
}

androidManifest配置文件

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

问题解析

动态权限申请

在配置文件中申请权限还是会报无权限问题，这里我们采用动态申请权限

方法一：练习时直接在oncreate里面添加该语句

ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.SEND_SMS} , 1);

方法二：对方法一的完善

 String[] permissions = new String[]{Manifest.permission.SEND_SMS};
    List<String> mPermissionList = new ArrayList<>();

    // private ImageView welcomeImg = null;
    private static final int PERMISSION_REQUEST = 1;

    // 检查权限
    private void checkPermission() {
        mPermissionList.clear();
        //判断哪些权限未授予
        for (int i = 0; i < permissions.length; i++) {
            if (ContextCompat.checkSelfPermission(this, permissions[i]) != PackageManager.PERMISSION_GRANTED) {
                mPermissionList.add(permissions[i]);
            }
        }
        /**
         * 判断是否为空
         */
        if (mPermissionList.isEmpty()) {//未授予的权限为空，表示都授予了
        } else {//请求权限方法
            String[] permissions = mPermissionList.toArray(new String[mPermissionList.size()]);//将List转为数组
            ActivityCompat.requestPermissions(this, permissions, PERMISSION_REQUEST);
        }
    }

    /**
     * 响应授权
     * 这里不管用户是否拒绝，都进入首页，不再重复申请权限
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case PERMISSION_REQUEST:
                break;
            default:
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);
                break;
        }
    }

短信发送

在这里需要控制短信的发送长度，如果长度大于70就分开发送

//获取发送地址和发送内容
                String messageAddress = mEditText1.getText().toString();
                String messageContent = mEditText2.getText().toString();

                //构建一取得default instance的SmsManager对象

                SmsManager smsManager = SmsManager.getDefault();
                //检查输入内容是否为空
                if (messageAddress.trim().length() != 0 && messageContent.trim().length() != 0) {
                    //设置短信长度
                    if (messageContent.length() > 70) {
                        ArrayList<String> texts = smsManager.divideMessage(messageContent);
                        for (String text : texts) {
                            smsManager.sendTextMessage(messageAddress, null, text, null, null);
                        }
                    } else {
                        smsManager.sendTextMessage(messageAddress, null, messageContent, null, null);
                    }


                    //提示发送成功
                    Toast.makeText(MainActivity.this, "发送成功", Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(MainActivity.this, "发送地址或者内容不能为空", Toast.LENGTH_SHORT).show();
                }
            }