我正在尝试使用其他应用程序打开文件,即打开带有Gallery的.jpg,带有Acrobat的.pdf等.
我遇到的问题是,当我尝试在应用程序中打开文件时,它只会打开所选应用程序而不是在应用程序中打开文件.我尝试通过Intent跟随Android打开pdf文件,但我必须遗漏一些东西.
public String get_mime_type(String url) {
String ext = MimeTypeMap.getFileExtensionFromUrl(url);
String mime = null;
if (ext != null) {
mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(ext);
}
return mime;
}
public void open_file(String filename) {
File file = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DOWNLOADS), filename);
// Get URI and MIME type of file
Uri uri = Uri.fromFile(file).normalizeScheme();
String mime = get_mime_type(uri.toString());
// Open file with user selected app
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setData(uri);
intent.setType(mime);
context.startActivity(Intent.createChooser(intent, "Open file with"));
}
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据我所知,它返回正确的URI和MIME类型: …