//此系列博文是《第一行Android代码》的学习笔记，如有错漏，欢迎指正！

当手机接收到一条短信的时候， 系统会发出一条值为 android.provider.Telephony.SMS_RECEIVED 的广播， 这条广播里携带着与短信相关的所有数据。每个应用程序都可以在广播接收器里对它进行监听，收到广播时再从中解析出短信的内容即可。下面让我们一起来实践一下吧。

一、新建项目，构建布局文件：

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:orientation="vertical" >

     <LinearLayout

         android:layout_width="match_parent"

         android:layout_height="50dp" >

         <TextView

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical"

             android:padding="10dp"

             android:text="From:" />

         <TextView

             android:id="@+id/sender"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical" />

     </LinearLayout>

     <LinearLayout

     android:layout_width="match_parent"

     android:layout_height="50dp" >

         <TextView

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical"

             android:padding="10dp"

             android:text="Content:" />

         <TextView

             android:id="@+id/content"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical" />

     </LinearLayout>

 </LinearLayout>

在布局文件中，我们添加了两个 LinearLayout，用于显示两行数据。分别用于显示短信的发送方和短信的内容。

二、构建内部类MessageReceiver：

 class MessageReceiver extends BroadcastReceiver {

         @Override

         public void onReceive(Context context, Intent intent) {

             Bundle bundle = intent.getExtras();

             Object[] pdus = (Object[]) bundle.get("pdus"); //  提取短信消息

             SmsMessage[] messages = new SmsMessage[pdus.length];

             for (int i = 0; i < messages.length; i++) {

                 messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);

             }

             String address = messages[0].getOriginatingAddress(); //  获取发送方号码

             String fullMessage = "";

             for (SmsMessage message : messages) {

                 fullMessage += message.getMessageBody(); //  获 取短信内容

             }

             sender.setText(address);

             content.setText(fullMessage);

         }

     }

在 MainActivity中新建内部类MessageReceiver并使其继承于BroadcastReceiver类，我们从 Intent参数中取出了一个 Bundle 对象， 然后使用 pdu密钥来提取一个 SMS pdus 数组，其中每一个 pdu 都表示一条短信消息。接着使用 SmsMessage 的createFromPdu()方法将每一个 pdu 字节数组转换为 SmsMessage 对象，调用这个对象的getOriginatingAddress()方法就可以获取到短信的发送方号码，调用 getMessageBody()方法就可以获取到短信的内容，然后将每一个 SmsMessage 对象中的短信内容拼接起来，就组成了一条完整的短信。最后将获取到的发送方号码和短信内容显示在TextView上。

三、添加主活动逻辑：

 public class MainActivity extends AppCompatActivity {

     private TextView sender;

     private TextView content;

     private IntentFilter receiveFilter;

     private MessageReceiver messageReceiver;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         sender = (TextView) findViewById(R.id.sender);

         content = (TextView) findViewById(R.id.content);

         receiveFilter = new IntentFilter();

         receiveFilter.addAction("android.provider.Telephony.SMS_RECEIVED");

         messageReceiver = new MessageReceiver();

         registerReceiver(messageReceiver, receiveFilter);

     }

     @Override

     protected void onDestroy() {

         super.onDestroy();

         unregisterReceiver(messageReceiver);

     }

     class MessageReceiver extends BroadcastReceiver {

         @Override

         public void onReceive(Context context, Intent intent) {

             Bundle bundle = intent.getExtras();

             Object[] pdus = (Object[]) bundle.get("pdus"); //  提取短信消息

             SmsMessage[] messages = new SmsMessage[pdus.length];

             for (int i = 0; i < messages.length; i++) {

                 messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);

             }

             String address = messages[0].getOriginatingAddress(); //  获取发送方号码

             String fullMessage = "";

             for (SmsMessage message : messages) {

                 fullMessage += message.getMessageBody(); //  获 取短信内容

             }

             sender.setText(address);

             content.setText(fullMessage);

         }

     }

 }

主活动中运用了动态注册广播的技术。在 onCreate()方法中我们先对 MessageReceiver 进行注册，然后在 onDestroy()方法中再对它取消注册。

四、权限的声明：

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

我们想要程序接收到系统短信是需要取得系统权限的。

最后程序的运行效果如图：

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" alt="" width="256" height="456" />

既然已经能够接收短信了，我们顺便天添加发送短信的功能。

五、修改布局文件：

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:orientation="vertical" >

     <LinearLayout

         android:layout_width="match_parent"

         android:layout_height="50dp" >

         <TextView

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical"

             android:padding="10dp"

             android:text="From:" />

         <TextView

             android:id="@+id/sender"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical" />

     </LinearLayout>

     <LinearLayout

     android:layout_width="match_parent"

     android:layout_height="50dp" >

         <TextView

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical"

             android:padding="10dp"

             android:text="Content:" />

         <TextView

             android:id="@+id/content"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical" />

     </LinearLayout>

     <LinearLayout

         android:layout_width="match_parent"

         android:layout_height="50dp" >

         <TextView

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical"

             android:padding="10dp"

             android:text="To:" />

         <EditText

             android:id="@+id/to"

             android:layout_width="0dp"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical"

             android:layout_weight="1" />

     </LinearLayout>

     <LinearLayout

         android:layout_width="match_parent"

         android:layout_height="50dp" >

         <EditText

             android:id="@+id/msg_input"

             android:layout_width="0dp"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical"

             android:layout_weight="1" />

         <Button

             android:id="@+id/send"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="center_vertical"

             android:text="Send" />

     </LinearLayout>

 </LinearLayout>

我们又新增了两个 LinearLayout，分别用于手机号码和内容。

六、修改主活动代码：

 package com.mycompany.notificationtest;

 import android.app.Notification;

 import android.app.NotificationManager;

 import android.app.PendingIntent;

 import android.content.BroadcastReceiver;

 import android.content.Context;

 import android.content.Intent;

 import android.content.IntentFilter;

 import android.support.v7.app.AppCompatActivity;

 import android.os.Bundle;

 import android.telephony.SmsManager;

 import android.telephony.SmsMessage;

 import android.view.View;

 import android.widget.Button;

 import android.widget.EditText;

 import android.widget.TextView;

 import android.widget.Toast;

 public class MainActivity extends AppCompatActivity {

     private TextView sender;

     private TextView content;

     private IntentFilter receiveFilter;

     private MessageReceiver messageReceiver;

     private EditText to;

     private EditText msgInput;

     private Button send;

     private IntentFilter sendFilter;

     private SendStatusReceiver sendStatusReceiver;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         sender = (TextView) findViewById(R.id.sender);

         content = (TextView) findViewById(R.id.content);

         receiveFilter = new IntentFilter();

         receiveFilter.addAction("android.provider.Telephony.SMS_RECEIVED");

         messageReceiver = new MessageReceiver();

         registerReceiver(messageReceiver, receiveFilter);

         to = (EditText)findViewById(R.id.to);

         msgInput = (EditText)findViewById(R.id.msg_input);

         send = (Button)findViewById(R.id.send);

         send.setOnClickListener(new View.OnClickListener() {

             @Override

             public void onClick(View v) {

                 SmsManager smsManager = SmsManager.getDefault();

                 Intent sentIntent = new Intent("SENT_SMS_ACTION");

                 PendingIntent pi = PendingIntent.getBroadcast

                         (MainActivity.this, 0, sentIntent, 0);

                 smsManager.sendTextMessage(to.getText().toString(), null,

                         msgInput.getText().toString(), pi, null);

             }

         });

         sendFilter = new IntentFilter();

         sendFilter.addAction("SENT_SMS_ACTION");

         sendStatusReceiver = new SendStatusReceiver();

         registerReceiver(sendStatusReceiver, sendFilter);

     }

     @Override

     protected void onDestroy() {

         super.onDestroy();

         unregisterReceiver(messageReceiver);

         unregisterReceiver(sendStatusReceiver);

     }

     class MessageReceiver extends BroadcastReceiver {

         @Override

         public void onReceive(Context context, Intent intent) {

             Bundle bundle = intent.getExtras();

             Object[] pdus = (Object[]) bundle.get("pdus"); //  提取短信消息

             SmsMessage[] messages = new SmsMessage[pdus.length];

             for (int i = 0; i < messages.length; i++) {

                 messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);

             }

             String address = messages[0].getOriginatingAddress(); //  获取发送方号码

             String fullMessage = "";

             for (SmsMessage message : messages) {

                 fullMessage += message.getMessageBody(); //  获 取短信内容

             }

             sender.setText(address);

             content.setText(fullMessage);

         }

     }

     class SendStatusReceiver extends BroadcastReceiver {

         @Override

         public void onReceive(Context context, Intent intent) {

             if (getResultCode() == RESULT_OK) {

 //  短信发送成功

                 Toast.makeText(context, "Send succeeded", Toast.LENGTH_LONG).show();

             } else {

 //  短信发送失败

                 Toast.makeText(context, "Send failed", Toast.LENGTH_LONG).show();

             }

         }

     }

 }

我们先获取到了布局文件中新增控件的实例，然后在 Send 按钮的点击事件里面处理了发送短信的具体逻辑。当 Send 按钮被点击时，会先调用 SmsManager 的getDefault()方法获取到 SmsManager的实例，然后再调用它的 sendTextMessage()方法就可以去发送短信了。sendTextMessage()方法接收五个参数，其中第一个参数用于指定接收人的手机号码，第三个参数用于指定短信的内容，其他的几个参数我们暂时用不到，直接传入 null就可以了。

七、修改权限:

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

在manifest文件中加入上述发送短信的权限声明就大功告成了。

　　 //End.

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