How to play a video in SDCard or other storage in Android

Development Platform & Builds Mobile
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1

I have tried days to play a Video that been put in SDCard or somewhere user can access by the File Browser. I made a UMG with a TextBox and Button. When the button is clicked, I use “Open File” node to play the video that the path is from TextBox. But it always return False. No matter what Path I give.

I look into LogCat There is an log “Failed to set data source for file /…/DCIM/Camera/test.mp4”. I flow the code and find in file “AndroidMediaPlayer.cpp” line 312.

if (!JavaMediaPlayer->SetDataSource(FileRootPath, FileOffset, FileSize))
			{
				UE_LOG(LogAndroidMedia, Warning, TEXT("Failed to set data source for file %s"), *FilePath);
				return false;
			}

And I find it call a Java Function in file “Mediaplayer14.java” named “setDataSource” and got a false.

	public boolean setDataSource(
		String moviePath, long offset, long size)
		throws IOException,
			java.lang.InterruptedException,
			java.util.concurrent.ExecutionException
	{
		audioTracks.clear();
		videoTracks.clear();

		try
		{
			File f = new File(moviePath);
			if (!f.exists() || !f.isFile()) 
			{
				return false;
			}
			RandomAccessFile data = new RandomAccessFile(f, "r");
			setDataSource(data.getFD(), offset, size);
			releaseBitmapRenderer();

			if (android.os.Build.VERSION.SDK_INT >= 16)
			{
				MediaExtractor extractor = new MediaExtractor();
				if (extractor != null)
				{
					extractor.setDataSource(data.getFD(), offset, size);
					updateTrackInfo(extractor);
					extractor.release();
					extractor = null;
				}
			}
		}
		catch(IOException e)
		{
			GameActivity.Log.debug("setDataSource (file): Exception = " + e);
			return false;
		}
		return true;
	}

It seems that only to place to return a False. One is line 205.

			if (!f.exists() || !f.isFile()) 
			{
				return false;
			}

and

		catch(IOException e)
		{
			GameActivity.Log.debug("setDataSource (file): Exception = " + e);
			return false;
		}

By the Logcat I am sure is some thing wrong with “!f.exists() || !f.isFile()”. But I tried to use LE File Manager plugin to see this folrd. I can see the file right here and it dose exists. I really don’t know where I did wrong. T_T

All I want to do is a media player that can find and play videos in the storage. It seams that my game can only play videos in “Movies” folder.