Opening big files above 30 mb app gets stuck in android - xamarin.forms

Question

When I open big files(document) in third party app above 30 mb file app gets stuck - can anyone help me out of this?
I use dependency service from Xamarin.Forms for opening the file and in Android I have implemented this code:
public void OpenFile(File fileToOpen)
{
var uri = Android.Net.Uri.FromFile(fileToOpen);
var intent = new Intent();
var mime = IOUtil.GetMimeType(uri.ToString());
intent.SetAction(Intent.ActionView);
intent.SetDataAndType(uri, mime);
intent.SetFlags(ActivityFlags.NewTask);
_context.StartActivity(intent);
}

Answer 1

If your android phone's system version is android 7.0.
You need to notice that,in 7.0, Android has enhanced access to files. File access must be fileProvider.
fileType = fileType.toLowerCase();
Uri uri = null;
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
uri = FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID + ".fileProvider", new File(filePath));
}else {
uri = Uri.fromFile(new File(filePath));
}
intent.setDataAndType(uri, getMap(fileType));
context.startActivity(intent);
However,if your three party app does not support the way file permissions are turned on 7.0, it still will error.
So,you can try this rogue method(^-^).Skip its verification and continue using the 6.0 method
public static void openFileEx(String filePath, String fileType, Context context) {
Intent intent = new Intent(Intent.ACTION_VIEW);
// Judging the version is greater than or equal to 7.0
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
StrictMode.setVmPolicy(builder.build());
}
Uri data = Uri.fromFile(new File(filePath));
intent.setDataAndType(data, getMap(fileType));
Toast.makeText(context, "uri:" + data.toString(), Toast.LENGTH_SHORT).show();
context.startActivity(intent);
}
More info about code's getMap method
public static String getMap(String key) {
Map<String, String> map = new HashMap<String, String>();
map.put("rar", "application/x-rar-compressed");
map.put("jpg", "image/jpeg");
map.put("zip", "application/zip");
map.put("pdf", "application/pdf");
map.put("doc", "application/msword");
map.put("docx", "application/msword");
map.put("wps", "application/msword");
map.put("xls", "application/vnd.ms-excel");
map.put("et", "application/vnd.ms-excel");
map.put("xlsx", "application/vnd.ms-excel");
map.put("ppt", "application/vnd.ms-powerpoint");
map.put("html", "text/html");
map.put("htm", "text/html");
map.put("txt", "text/html");
map.put("mp3", "audio/mpeg");
map.put("mp4", "video/mp4");
map.put("3gp", "video/3gpp");
map.put("wav", "audio/x-wav");
map.put("avi", "video/x-msvideo");
map.put("flv", "flv-application/octet-stream");
map.put("", "*/*");
return map.get(key.toLowerCase());
}