设置为默认短信应用四个步骤

<!-- 具备短信默认应用条件 ① -->
<intent-filter>
<action android:name="android.intent.action.SEND" />
<action android:name="android.intent.action.SENDTO" />

<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />

<data android:scheme="sms" />
<data android:scheme="smsto" />
<data android:scheme="mms" />
<data android:scheme="mmsto" />
</intent-filter>

<!-- 具备短信默认应用条件 ②-->
<!-- BroadcastReceiver that listens for incoming SMS messages -->
<receiver
android:name=".SmsReceiver"
android:permission="android.permission.BROADCAST_SMS">
<intent-filter>
<action android:name="android.provider.Telephony.SMS_DELIVER" />
</intent-filter>
</receiver>

<!-- 具备短信默认应用条件 ③ -->
<!-- BroadcastReceiver that listens for incoming MMS messages -->
<receiver
android:name=".MmsReceiver"
android:permission="android.permission.BROADCAST_WAP_PUSH">
<intent-filter>
<action android:name="android.provider.Telephony.WAP_PUSH_DELIVER" />
<data android:mimeType="application/vnd.wap.mms-message" />
</intent-filter>
</receiver>

<!-- 具备短信默认应用条件 ④ -->
<!-- Service that delivers messages from the phone "quick response" -->
<service
android:name=".HeadlessSmsSendService"
android:exported="true"
android:permission="android.permission.SEND_RESPOND_VIA_MESSAGE">
<intent-filter>
<action android:name="android.intent.action.RESPOND_VIA_MESSAGE" />
<category android:name="android.intent.category.DEFAULT" />

<data android:scheme="sms" />
<data android:scheme="smsto" />
<data android:scheme="mms" />
<data android:scheme="mmsto" />
</intent-filter>
</service>