<!-- BroadcastReceiver that listens for incoming SMS messages --><receiver android:name=".demo.SmsReceiver"android:permission="android.permission.BROADCAST_SMS"><intent-filter><action android:name="android.provider.Telephony.SMS_DELIVER" /></intent-filter></receiver><!-- BroadcastReceiver that listens for incoming MMS messages --><receiver android:name=".demo.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><!-- Activity that allows the user to send new SMS/MMS messages --><activity android:name=".demo.ComposeSmsActivity" ><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></activity><!-- Service that delivers messages from the phone "quick response" --><service android:name=".demo.HeadlessSmsSendService"android:permission="android.permission.SEND_RESPOND_VIA_MESSAGE"android:exported="true" ><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>

 <activity android:name=".demo.MainActivity"><intent-filter><action android:name="android.intent.action.MAIN"/><category android:name="android.intent.category.LAUNCHER"/><action android:name="android.intent.action.SEND" /><action android:name="android.intent.action.SENDTO" /><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>
</activity>

 @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main2);

        String defaultSmsApp = null;     　　String currentPn = getPackageName();//获取当前程序包名if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT){    defaultSmsApp = Telephony.Sms.getDefaultSmsPackage(this);//获取手机当前设置的默认短信应用的包名}if (!defaultSmsApp.equals(currentPn)) {    Intent intent = new Intent(Telephony.Sms.Intents.ACTION_CHANGE_DEFAULT);    intent.putExtra(Telephony.Sms.Intents.EXTRA_PACKAGE_NAME, currentPn);    startActivity(intent);}

 }