将 fileChooserParams 中的 mime 类型转换为 Intent.setType 的正确格式 [英] Convert mime types in fileChooserParams to the right format for Intent.setType
问题描述
我正在尝试使用 Android 中的 WebView 上传文件.
I am trying to upload a file using a WebView in Android.
这是正在使用的代码:
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public boolean onShowFileChooser(WebView webView, final ValueCallback<Uri[]> filePathsCallback, final WebChromeClient.FileChooserParams fileChooserParams) {
Intent intent = fileChooserParams.createIntent();
LOG.d(LOG_TAG, "mime types: " + Arrays.toString(fileChooserParams.getAcceptTypes()));
// PRINTS [.jpg,.png,.tiff,.jpeg,.tif,.pdf] !!
try {
parentEngine.cordova.startActivityForResult(new CordovaPlugin() {
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
// ...
}
}, intent, FILECHOOSER_RESULTCODE);
} catch (ActivityNotFoundException e) {
// ...
}
return true;
}
问题是当我必须使用的外部库(ng-file-upload
)触发了这个方法的执行时,在 fileChooserParams 中作为参数传递的 mime 类型是:[.jpg,.png,.tiff,.jpeg,.tif,.pdf]
.我在 允许的 mime 列表中没有看到其中的大部分内容类型.
The problem is that when the external library that I must use (ng-file-upload
) triggers the execution of this method, the mime types passed as argument in fileChooserParams are: [.jpg,.png,.tiff,.jpeg,.tif,.pdf]
. I don't see most of these in the list of allowed mime types.
因此,我在 LogCat 中发现了这个错误:没有找到处理文件选择器意图的活动.:android.content.ActivityNotFoundException:没有找到处理意图的活动{ act=android.intent.action.GET_CONTENT cat=[android.intent.category.OPENABLE] typ=.jpg,.png,.tiff,.jpeg,.tif,.pdf }
As a consequence I find this error in LogCat:
No activity found to handle file chooser intent.: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.GET_CONTENT cat=[android.intent.category.OPENABLE] typ=.jpg,.png,.tiff,.jpeg,.tif,.pdf }
如果我只是添加 intent.setType("image/* application/pdf");
一切都按预期工作!
If I simply add intent.setType("image/* application/pdf");
everything works as expected!
现在问题是:在合并请求 我想提交给 cordova-android 的贡献者如何我如何安全地将 fileChooserParams 转换为正确的格式?
Now the question is: in the Merge Request that I want to submit to cordova-android's contributors how do I safely transform the fileChooserParams to the correct format?
推荐答案
我使用以下代码改进了解决方案:
I improved the solution using this code:
// Validation utility for mime types
private List<String> extractValidMimeTypes(String[] mimeTypes) {
List<String> results = new ArrayList<String>();
List<String> mimes;
if (mimeTypes.length() == 1 && mimeTypes[0].contains(",")) {
mimes = Arrays.asList(mimeTypes[0].split(","));
} else {
mimes = Arrays.asList(mimeTypes);
}
MimeTypeMap mtm = MimeTypeMap.getSingleton();
for (String mime : mimes) {
if (mime != null && mime.trim().startsWith(".")) {
String extensionWithoutDot = mime.trim().substring(1, mime.trim().length());
String derivedMime = mtm.getMimeTypeFromExtension(extensionWithoutDot);
if (derivedMime != null && !results.contains(derivedMime)) {
// adds valid mime type derived from the file extension
results.add(derivedMime);
}
} else if (mtm.getExtensionFromMimeType(mime) != null && !results.contains(mime)) {
// adds valid mime type checked agains file extensions mappings
results.add(mime);
}
}
return results;
}
public boolean onShowFileChooser(WebView webView, final ValueCallback<Uri[]> filePathsCallback, final WebChromeClient.FileChooserParams fileChooserParams) {
Intent intent = fileChooserParams.createIntent();
List<String> validMimeTypes = extractValidMimeTypes(fileChooserParams.getAcceptTypes());
if (validMimeTypes.isEmpty()) {
intent.setType(DEFAULT_MIME_TYPE);
} else {
intent.setType(String.join(" ", validMimeTypes));
}
...
查看我的拉取请求了解更多详情.
See my Pull Request for more details.
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