Android Studio中两个模拟器互发短信的解决方案

折腾了半天，查资料后发现是由于当前版本较高，危险权限即使申明了也不能用造成的。

网上许多资料都有误导性，其实只需要多加几行代码就解决了，先把成功的代码贴上来：

（1）主活动代码：

import android.Manifest;import android.app.Activity;import android.content.pm.PackageManager;import android.os.Bundle;import android.support.v4.app.ActivityCompat;import android.support.v4.content.ContextCompat;import android.widget.EditText;import android.widget.Toast;import android.telephony.SmsManager;import android.view.View;import android.widget.Button;import java.util.List;public class MainActivity extends Activity implements ActivityCompat.OnRequestPermissionsResultCallback{    /*数据成员*/    private Button snd;//发送键    private EditText tel;//电话号码    private EditText txt;//要发送的文本    /*活动被创建时调用的方法：onCreate()*/    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        snd = findViewById(R.id.Button01);        tel = findViewById(R.id.EditText01);        txt = findViewById(R.id.EditText02);        snd.setOnClickListener(new View.OnClickListener() {            public void onClick(View view) {                sendShortMessage();//点击之后调用sendShortMessage()方法            }        });    }    /*发送信息的函数*/    protected void sendShortMessage() {        String phoneNo = tel.getText().toString();        String message = txt.getText().toString();        int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE);        if (permissionCheck != PackageManager.PERMISSION_GRANTED) {            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_PHONE_STATE}, 0);        }        try {            SmsManager smsManager = SmsManager.getDefault();            List<String> texts = smsManager.divideMessage(message);            for (String text : texts) {                smsManager.sendTextMessage(phoneNo, null, text, null, null);            }            Toast.makeText(getApplicationContext(), "发送成功",                    Toast.LENGTH_LONG).show();        }        catch (Exception e) {            Toast.makeText(getApplicationContext(),                    "发送失败",                    Toast.LENGTH_LONG).show();            e.printStackTrace();        }    }}

（2）布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="vertical"    >    <EditText        android:id="@+id/EditText01"        android:layout_width="match_parent"        android:layout_height="wrap_content"        />    <EditText        android:id="@+id/EditText02"        android:layout_width="match_parent"        android:layout_height="wrap_content"        />    <Button        android:id="@+id/Button01"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="发送"        /></LinearLayout>

（3）Manifest文件：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.wuyusong.exp05">    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>    <uses-permission android:name="android.permission.SEND_SMS"/>    <uses-permission android:name="android.permission.READ_SMS"/>    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:roundIcon="@mipmap/ic_launcher_round"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />    </intent-filter>    </activity>    </application>    </manifest>

运行效果：

在运行之前需要检查权限，然后授权以后才能拿到READ_PHONE_STATE。关键代码：

public class MainActivity extends Activity implements ActivityCompat.OnRequestPermissionsResultCallback{...}

以及：

        int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE);        if (permissionCheck != PackageManager.PERMISSION_GRANTED) {            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_PHONE_STATE}, 0);        }