unity+android：打开安卓文件浏览器，并获取选择文件真实路径

java代码

package com.luo.yikun.getfilepath;


import android.app.Activity;
import android.app.Fragment;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;

import android.provider.DocumentsContract;
import android.provider.MediaStore;


import com.unity3d.player.UnityPlayer;


import java.io.File;




public class GetFilePath extends Fragment {
    String m_gameObjectName;
    String m_funcName;

    private Context unityContext;
    private Activity unityActivity;

    private static final String TAG = "GetFilePath";

    public void UnityFunc(String gameObjectName, String funcName)
    {
        m_gameObjectName = gameObjectName;
        m_funcName = funcName;
    }

    private static GetFilePath Instance = null;
    //private String gameObjectName;

    public static GetFilePath GetInstance()
    {
        if(Instance == null)
        {
            Instance = new GetFilePath();
            //Instance.gameObjectName = gameObject;
            Instance.unityActivity = UnityPlayer.currentActivity;
            if (Instance.unityActivity == null)
            {
                Instance.CallUnity("Instance.unityActivity == null");
            }
            Instance.unityContext = Instance.unityActivity.getBaseContext();
            if (Instance.unityContext == null)
            {
                Instance.CallUnity("Instance.unityContext == null");
            }
            UnityPlayer.currentActivity.getFragmentManager().beginTransaction().add(Instance, TAG).commit();

        }
        return Instance;
    }

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setRetainInstance(true);  // 这一句很重要，保存对该Fragment的引用，防止在旋转屏幕等操作时时丢失引用（Fragment隶属于Activity）
    }

    // 调用 Unity
    // gameObjectName 为接受消息的Unity 中 GameObject 的名字
    // functionName   为接受消息的GameObject 挂载 C# 脚本中的函数名
    // _content       为发送给Unity 的内容
    public void CallUnity( String _content)
    {
        UnityPlayer.UnitySendMessage(m_gameObjectName, m_funcName, _content);
    }

    public void fileBrower()
    {
        Intent myintent = new Intent(Intent.ACTION_GET_CONTENT);
        myintent.setType("*/*");
        myintent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(Intent.createChooser(myintent, "选择文件"), 1);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        if (resultCode != Activity.RESULT_OK) {
            super.onActivityResult(requestCode, resultCode, data);
            return;
        }
        if (requestCode == 1) {
            Uri uri = data.getData();
            String path = getPath(unityContext, uri);
            if (path != null) {
                File file = new File(path);
                if (file.exists()) {
                    String upLoadFilePath = file.toString();
                    String upLoadFileName = file.getName();
                    CallUnity(upLoadFilePath);
                }
            }

        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    public String getPath(final Context context, final Uri uri) {

        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
//                Log.i(TAG,"isExternalStorageDocument***"+uri.toString());
//                Log.i(TAG,"docId***"+docId);
//                以下是打印示例：
//                isExternalStorageDocument***content://com.android.externalstorage.documents/document/primary%3ATset%2FROC2018421103253.wav
//                docId***primary:Test/ROC2018421103253.wav
                final String[] split = docId.split(":");
                final String type = split[0];

                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {
//                Log.i(TAG,"isDownloadsDocument***"+uri.toString());
                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

                return getDataColumn(context, contentUri, null, null);
            }
            // MediaProvider
            else if (isMediaDocument(uri)) {
//                Log.i(TAG,"isMediaDocument***"+uri.toString());
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }

                final String selection = "_id=?";
                final String[] selectionArgs = new String[]{split[1]};

                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        }
        // MediaStore (and general)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {
//            Log.i(TAG,"content***"+uri.toString());
            return getDataColumn(context, uri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
//            Log.i(TAG,"file***"+uri.toString());
            return uri.getPath();
        }
        return null;
    }

    /**
     * Get the value of the data column for this Uri. This is useful for
     * MediaStore Uris, and other file-based ContentProviders.
     *
     * @param context       The context.
     * @param uri           The Uri to query.
     * @param selection     (Optional) Filter used in the query.
     * @param selectionArgs (Optional) Selection arguments used in the query.
     * @return The value of the _data column, which is typically a file path.
     */
    public String getDataColumn(Context context, Uri uri, String selection,
                                String[] selectionArgs) {

        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {column};

        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                    null);
            if (cursor != null && cursor.moveToFirst()) {
                final int column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }


    public boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    public boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    public boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }
}

AndroidMainfest文件增加权限

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.luo.yikun.getfilepath">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
</manifest>

demo下载
https://pan.baidu.com/s/16KOk1Nt7Eri4JPsXsHwm7A
demo是早期的，可能跟上面的不同，但是测试过unity打包出apk能浏览到文件的真实路径