我有一个与
Android Wear集成的消息传递应用程序.与环聊类似,在Android Wear智能手表中选择通知时,您可以滑动到显示与所选消息对应的对话的第二张卡.我使用BigTextStyle通知实现它,但我需要知道BigTextStyle支持的最大字符数,这样我就可以在对话太大而无法完全适应时正确修剪对话.我在文档上找不到这个信息.
经过一些调查,max chars大约是5000,至少在Android Wear模拟器中是这样.因此,我可以这样做：
// scroll to the bottom of the notification card NotificationCompat.WearableExtender extender = new NotificationCompat.WearableExtender().setStartScrollBottom(true); // get conversation messages in a big single text CharSequence text = getConversationText(); // trim text to its last 5000 chars int start = Math.max(0,text.length() - 5000); text = text.subSequence(start,text.length()); // set text into the big text style NotificationCompat.BigTextStyle style = new NotificationCompat.BigTextStyle().bigText(text); // build notification Notification notification = new NotificationCompat.Builder(context).setStyle(style).extend(extender).build();
有谁知道适合BigTextStyle通知的确切字符数？它是否在不同设备之间变化？
解决方法
简答
限制为5120个字符(5KB),但您无需限制邮件.这是在构建器上为您完成的.
限制为5120个字符(5KB),但您无需限制邮件.这是在构建器上为您完成的.
详细解答
在您的代码中,您使用的是内部使用NotificationCompat.Builder的NotificationCompat.BigTextStyle.
当你调用setBigContentTitle时会发生这种情况
/**
* Overrides ContentTitle in the big form of the template.
* This defaults to the value passed to setContentTitle().
*/
public BigTextStyle setBigContentTitle(CharSequence title) {
mBigContentTitle = Builder.limitCharSequenceLength(title);
return this;
}
功能limitCharSequenceLength执行此操作
protected static CharSequence limitCharSequenceLength(CharSequence cs) {
if (cs == null) return cs;
if (cs.length() > MAX_CHARSEQUENCE_LENGTH) {
cs = cs.subSequence(0,MAX_CHARSEQUENCE_LENGTH);
}
return cs;
}
如果我们检查常量声明,我们发现了这一点
/**
* Maximum length of CharSequences accepted by Builder and friends.
*
* <p>
* Avoids spamming the system with overly large strings such as full e-mails.
*/
private static final int MAX_CHARSEQUENCE_LENGTH = 5 * 1024;
