android 实现发送彩信方法 (MMS),非调用系统界面
在Android平台上，发送彩信（Multimedia Messaging Service，MMS）是通过编程接口实现的，而非直接调用系统界面。这种技术允许开发者在应用程序中集成彩信功能，为用户提供无打扰的服务，例如自动发送带有图片、音频或视频的多媒体消息。下面我们将详细探讨如何在Android中实现这个功能。
发送彩信需要使用`SmsManager`类，这是Android SDK提供的一个接口，用于处理短信和彩信的发送。在Android 2.2及以上版本中，`SmsManager`支持MMS功能。以下是一段基础的代码示例：
```java
SmsManager smsManager = SmsManager.getDefault();
smsManager.sendMultipartTextMessage(
destinationAddress, // 接收方电话号码
null, // 发送者端口号，一般为null
createMultipartTextArrayList(), // 创建多媒体内容的ArrayList
null, // 成功回调PendingIntent
null // 失败回调PendingIntent
);
```
在`createMultipartTextArrayList()`方法中，你需要构建一个`ArrayList`，包含`MmsPart`对象，每个`MmsPart`代表一条消息的组成部分，如文本、图片、音频或视频。`MmsPart`可以通过`MimePart`类进行包装，如下所示：
```java
ArrayList parts = new ArrayList<>();
parts.add(new MmsPart("text/plain", "你好，这是一条彩信")); // 文本部分
parts.add(new MmsPart("image/jpeg", getBitmapFromAsset("image.jpg"))); // 图片部分
// ... 添加其他多媒体部分
```
`getBitmapFromAsset()`方法用于从应用资源中获取Bitmap图像，对于音频和视频，你可能需要使用`MediaRecorder`或`MediaPlayer`来准备数据。
发送彩信时还需要注意权限问题，确保在`AndroidManifest.xml`中添加了以下权限：
```xml
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