通过蓝牙共享文本/纯文本字符串将数据转换为HTML [英] Sharing text/plain String via Bluetooth converts data into HTML
问题描述
我正在尝试通过蓝牙发送纯文本，但是在某些地方将其转换为HTML.
I am trying to send plain text via Bluetooth, but it is converted to HTML somewhere.
我正在使用的代码基本上是这样的:
The code I'm using is basically this:
String content = "This is just a test";
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, content);
sendIntent.setType("text/plain");
String title = "Share with…";
startActivity(Intent.createChooser(sendIntent, title));
当我运行此代码并选择Bluetooth选项时，文件将以名称"bluetooth_content_share.html"和以下内容推送到远程系统:
When I run this code and choose the Bluetooth option, the file is pushed to the remote system with the name "bluetooth_content_share.html" and with these contents:
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/></head><body>This is just a test</body></html>
我尝试在添加EXTRA_TEXT之前调用setType，但症状没有改变.其他共享操作(例如，添加到Dropbox")以纯文本形式获取数据.而且我已经能够使用其他应用程序(例如"ES File Explorer")通过蓝牙成功发送纯文本文件.
I've tried calling setType before adding the EXTRA_TEXT with no change in symptoms. Other share actions ("Add to Dropbox", for example) get the data as plain text. And I have been able to use other applications ("ES File Explorer", for example) to successfully send plain text files via Bluetooth.
如何像我问的那样以纯文本形式发送数据?
How can I get the data to be sent as just plain text like I asked?
推荐答案
TL; DR::您必须创建文件或实现ContentProvider并将其作为EXTRA_STREAM发送，但这会中断其他想要通过EXTRA_TEXT以文本形式接收数据的应用程序.通过使用EXTRA_REPLACEMENT_EXTRAS，可以为蓝牙共享"应用实现例外.
TL;DR: You either have to create a file or implement a ContentProvider and send it as EXTRA_STREAM, but this breaks other apps that want to receive the data as text via EXTRA_TEXT. It's possible to implement an exception for the "Bluetooth Share" app by using EXTRA_REPLACEMENT_EXTRAS.
I was able to find this code in the source for the Android Bluetooth app (com/android/bluetooth/opp/BluetoothOppLauncherActivity.java):
if (action.equals(Intent.ACTION_SEND)) {
final String type = intent.getType();
final Uri stream = (Uri)intent.getParcelableExtra(Intent.EXTRA_STREAM);
CharSequence extra_text = intent.getCharSequenceExtra(Intent.EXTRA_TEXT);
if (stream != null && type != null) {
// clipped
} else if (extra_text != null && type != null) {
if (V) Log.v(TAG, "Get ACTION_SEND intent with Extra_text = "
+ extra_text.toString() + "; mimetype = " + type);
final Uri fileUri = creatFileForSharedContent(this, extra_text);
// clipped
} else {
Log.e(TAG, "type is null; or sending file URI is null");
finish();
return;
}
因此，如果有EXTRA_TEXT而没有EXTRA_STREAM，则将其发送到creatFileForSharedContent()，该文件又包含以下内容:
So if there's EXTRA_TEXT and no EXTRA_STREAM, then send it to creatFileForSharedContent(), which, in turn contains this:
String fileName = getString(R.string.bluetooth_share_file_name) + ".html";
context.deleteFile(fileName);
/*
* Convert the plain text to HTML
*/
StringBuffer sb = new StringBuffer("<html><head><meta http-equiv=\"Content-Type\""
+ " content=\"text/html; charset=UTF-8\"/></head><body>");
// Escape any inadvertent HTML in the text message
String text = escapeCharacterToDisplay(shareContent.toString());
// Regex that matches Web URL protocol part as case insensitive.
Pattern webUrlProtocol = Pattern.compile("(?i)(http|https)://");
Pattern pattern = Pattern.compile("("
+ Patterns.WEB_URL.pattern() + ")|("
+ Patterns.EMAIL_ADDRESS.pattern() + ")|("
+ Patterns.PHONE.pattern() + ")");
// Find any embedded URL's and linkify
Matcher m = pattern.matcher(text);
while (m.find()) {
//clipped
}
m.appendTail(sb);
sb.append("</body></html>");
换句话说，蓝牙应用程序将任何以文本形式发送的内容显式转换为HTML.谢谢，Android！
In other words, the Bluetooth app explicitly converts anything sent as text to HTML. Thanks, Android!
蓝牙应用程序将接受为EXTRA_STREAM的仅有两件事是内容:和文件:URI(
The only two things that the Bluetooth app will accept as an EXTRA_STREAM are content: and file: URIs (com/android/bluetooth/opp/BluetoothOppSendFileInfo.java):
if ("content".equals(scheme)) {
//clipped
} else if ("file".equals(scheme)) {
//clipped
} else {
// currently don't accept other scheme
return SEND_FILE_INFO_ERROR;
}
因此尝试发送数据:URI不起作用.
So trying to send a data: URI doesn't work.
这意味着您必须创建文件或实现ContentProvider. 只发送一些该死的纯文本！
This means you either have to create a file or implement a ContentProvider. Just to send some damned plain text!
但这可能会中断与其他希望通过EXTRA_TEXT方法接收数据的应用程序的共享.幸运的是，可以使用EXTRA_REPLACEMENT_EXTRAS创建一个仅提供给Bluetooth Share应用程序的EXTRA_STREAM:
But this has the potential to break sharing with other apps that want to receive the data via the EXTRA_TEXT method. Fortunately, it's possible to create an EXTRA_STREAM that is only provided to the Bluetooth Share app by using EXTRA_REPLACEMENT_EXTRAS:
String content = "This is just a test";
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, content);
sendIntent.setType("text/plain");
String title = "Share with…";
Intent shareChooser = Intent.createChooser(sendIntent, title);
// Add Bluetooth Share-specific data
try {
// Create file with text to share
final File contentFile = new File(getActivity().getExternalCacheDir(), "plain.txt");
FileWriter contentFileWriter = new FileWriter(contentFile, false);
BufferedWriter contentWriter = new BufferedWriter(contentFileWriter);
contentWriter.write(content);
contentWriter.close();
Uri contentUri = Uri.fromFile(contentFile);
Bundle replacements = new Bundle();
shareChooser.putExtra(Intent.EXTRA_REPLACEMENT_EXTRAS, replacements);
// Create Extras Bundle just for Bluetooth Share
Bundle bluetoothExtra = new Bundle(sendIntent.getExtras());
replacements.putBundle("com.android.bluetooth", bluetoothExtra);
// Add file to Bluetooth Share's Extras
bluetoothExtra.putParcelable(Intent.EXTRA_STREAM, contentUri);
} catch (IOException e) {
// Handle file creation error
}
startActivity(shareChooser);
但是，您仍然必须处理删除文件，当用户选择蓝牙以外的其他内容与之共享时，这将变得更加复杂，因为该文件将永远不会打开，这使得Juan回答中的FileObserver解决方案变得不完整.
You still have to handle deleting the file, though, which becomes more complicated when the user chooses something other than Bluetooth to share with, since the file will never be opened, making the FileObserver solution in Juan's answer become incomplete.
这篇关于通过蓝牙共享文本/纯文本字符串将数据转换为HTML的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
