unity+android：打开安卓文件浏览器，并获取选择文件真实路径

忘是亡心i 2022-05-09 10:56 405阅读 0赞

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

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