安卓短信源码
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在安卓平台上,短信服务是应用程序与用户沟通的重要方式之一。然而,系统默认的短信发送机制有时并不能满足开发者的所有需求,特别是在处理长文本消息时。标题“安卓短信源码”所涉及的知识点主要集中在如何自定义短信发送逻辑,尤其是当短信内容超过70个汉字时,需要进行分包发送。描述中提到的源码详细步骤说明,将帮助我们理解这一过程。 我们需要了解Android中的SmsManager类,它是处理短信的核心API。在Android SDK中,`android.telephony.SmsManager`提供了发送短信、分段短信以及批量发送短信的功能。当我们需要发送超过70个字符(一个短信段)的短信时,SmsManager会自动进行短信分段。然而,如果我们希望自定义这个过程,比如在特定字符位置断开,就需要自己实现。 在源码中,通常会有以下关键步骤: 1. **获取SmsManager实例**:通过`SmsManager.getDefault()`方法获取系统提供的SmsManager对象。 2. **编写分包逻辑**:由于短信长度限制,我们需要先计算出短信内容需要分成多少个短信段。这可以通过遍历文本,每70个字符(或者更少,因为某些特殊字符可能占用多个短信段)作为一段,将内容分割成字符串数组。 3. **使用SmsManager发送短信**:对于每个短信段,使用`SmsManager.sendTextMessage()`方法。这个方法接受电话号码、短信内容和回调接口作为参数。如果短信需要发送到多个号码,可以多次调用此方法。 4. **处理发送结果**:为了确保短信发送成功,我们需要实现`SmsManager.Default_sms_callback`接口,处理发送状态回调。在`onStatusChanged()`或`onSendComplete()`方法中,我们可以检查短信发送的状态,如成功、失败或部分成功。 5. **权限处理**:发送短信需要在AndroidManifest.xml中声明`<uses-permission android:name="android.permission.SEND_SMS" />`权限,并且在Android 6.0及以上版本,还需要在运行时请求用户授权。 在`SmsManagerSendTest`这个文件中,很可能是包含了一个测试用例或者示例代码,用于演示上述步骤的实现。通过分析和运行这段代码,开发者可以更好地理解和掌握自定义短信分包发送的逻辑。 自定义短信发送涉及到对SmsManager的深入理解,以及对短信分段规则的掌握。通过源码学习,开发者可以创建更灵活、更符合需求的短信发送功能,尤其在处理长文本时,能够保证消息的完整性和发送效果。
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