在Android中将文件路径转换为Uri

Posted

技术标签:

【中文标题】在Android中将文件路径转换为Uri【英文标题】:Convert a file path to Uri in Android 【发布时间】:2015-02-20 13:40:36 【问题描述】:

我有一个应用程序,我可以在其中使用相机拍摄视频。我可以获取视频的文件路径,但我需要它作为 Uri。

我得到的文件路径:

/storage/emulated/0/DCIM/Camera/20141219_133139.mp4

我需要的是这样的:

content//media/external/video/media/18576.

这是我的代码。

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
        // if the result is capturing Image

         if (requestCode == CAMERA_CAPTURE_VIDEO_REQUEST_CODE) 
            if (resultCode == RESULT_OK) 
                // video successfully recorded
                // preview the recorded video
                // selectedImageUri = data.getData();
                // Uri selectedImage = data.getData();
                previewVideo();

                tv1.setText(String.valueOf((fileUri.getPath())));
                String bedroom=String.valueOf((fileUri.getPath()));
                Intent i = new Intent();
                i.putExtra(bhk1.BEDROOM2, bedroom);
                setResult(RESULT_OK,i); 
                btnRecordVideo.setText("ReTake Video");

             else if (resultCode == RESULT_CANCELED) 
                // user cancelled recording
                Toast.makeText(getApplicationContext(),
                        "User cancelled video recording", Toast.LENGTH_SHORT)
                        .show();
             else 
                // failed to record video
                Toast.makeText(getApplicationContext(),
                        "Sorry! Failed to record video", Toast.LENGTH_SHORT)
                        .show();
            
        
    

我需要来自字符串变量 bedroom 的 Uri。

【问题讨论】:

Get content uri from file path in android的可能重复 // Uri selectedImage = data.getData();。嗯..那不是你的uri吗? fileUri.getPath()。什么是文件路径?你应该告诉/显示! I am getting the path is /storage/emulated/0/DCIM/Camera/20141219_133139.mp4。在哪里?我们必须猜测? 我录制视频后存储路径路径为/storage/emulated/0/DCIM/Camera/20141219_133139.mp4。我需要得到这样的内容//media/external/video/media/ 18576 【参考方案1】:

如果你想从字符串文件路径中获取 Uri 路径。这个代码也将在 androidQ 中工作。

String outputFile = context.getExternalFilesDir("DirName") + "/fileName.extension";

            File file = new File(outputFile);
            Log.e("OutPutFile",outputFile);
            Uri uri = FileProvider.getUriForFile(Activity.this,
                    BuildConfig.APPLICATION_ID + ".provider",file);

在应用程序标签清单中声明提供者

<provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="$applicationId.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths" />
        </provider>

在 res -> xml ->provider_paths.xml

<paths>
    <external-path name="external_files" path="."/>
</paths>

【讨论】:

【参考方案2】:

如果您真的想获得类似 content//media/external/video/media/18576 的信息(例如,对于您的视频 mp4 绝对路径),而不仅仅是 file///storage/emulated/0/DCIM/Camera/20141219_133139.mp4,则此问题的正常答案:

MediaScannerConnection.scanFile(this,
          new String[]  file.getAbsolutePath() , null,
          new MediaScannerConnection.OnScanCompletedListener() 
      public void onScanCompleted(String path, Uri uri) 
          Log.i("onScanCompleted", uri.getPath());
      
 );

接受的答案是错误的(因为它不会返回content//media/external/video/media/*

Uri.fromFile(file).toString() 只返回类似file///storage/emulated/0/* 的东西,它是sdcard 上文件的简单绝对路径,但带有file// 前缀(方案)

您也可以使用Android的MediaStore数据库获取content uri

测试(返回 Uri.fromFile 和返回 MediaScannerConnection):

File videoFile = new File("/storage/emulated/0/video.mp4");

Log.i(TAG, Uri.fromFile(videoFile).toString());

MediaScannerConnection.scanFile(this, new String[]  videoFile.getAbsolutePath() , null,
        (path, uri) -> Log.i(TAG, uri.toString()));

输出:

我/测试:file:///storage/emulated/0/video.mp4

我/测试:content://media/external/video/media/268927

【讨论】:

content//file/// 之间有什么区别,我问,因为两者都适用于我的情况 请提供一个获取路径并返回uri的函数。 @aryanknp 了解 MediaStore 这个答案是唯一有效的答案。以上接受的答案并不能解决问题。【参考方案3】:

请尝试以下代码

Uri.fromFile(new File("/sdcard/sample.jpg"))

【讨论】:

看看这里可能会有所帮助:***.com/questions/38200282/… Kotlin 可以使用file.toUri() @grrigore 我认为您的意思是 toURI() 属于 java.net 包。 @KMC developer.android.com/reference/kotlin/androidx/core/net/… 这是我说的那个【参考方案4】:

以下代码在 18 API 之前可以正常工作:-

public String getRealPathFromURI(Uri contentUri) 

        // can post image
        String [] proj=MediaStore.Images.Media.DATA;
        Cursor cursor = managedQuery( contentUri,
                        proj, // Which columns to return
                        null,       // WHERE clause; which rows to return (all rows)
                        null,       // WHERE clause selection arguments (none)
                        null); // Order-by clause (ascending by name)
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();

        return cursor.getString(column_index);

在 kitkat 上使用以下代码:-

public static 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);
            final String[] split = docId.split(":");
            final String type = split[0];

            if ("primary".equalsIgnoreCase(type)) 
                return Environment.getExternalStorageDirectory() + "/" + split[1];
            

            // TODO handle non-primary volumes
        
        // DownloadsProvider
        else if (isDownloadsDocument(uri)) 

            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)) 
            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())) 
        return getDataColumn(context, uri, null, null);
    
    // File
    else if ("file".equalsIgnoreCase(uri.getScheme())) 
        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 static 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;



/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is ExternalStorageProvider.
 */
public static boolean isExternalStorageDocument(Uri uri) 
    return "com.android.externalstorage.documents".equals(uri.getAuthority());


/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is DownloadsProvider.
 */
public static boolean isDownloadsDocument(Uri uri) 
    return "com.android.providers.downloads.documents".equals(uri.getAuthority());


/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is MediaProvider.
 */
public static boolean isMediaDocument(Uri uri) 
    return "com.android.providers.media.documents".equals(uri.getAuthority());

查看以下链接了解更多信息:-

https://github.com/iPaulPro/aFileChooser/blob/master/aFileChooser/src/com/ipaulpro/afilechooser/utils/FileUtils.java

【讨论】:

以上是关于在Android中将文件路径转换为Uri的主要内容,如果未能解决你的问题,请参考以下文章

在 Android 4.4 中将 content:// URI 转换为实际路径

使用 React-Native 将 content:// URI 转换为 Android 的实际路径

Android 文件绝对路径和Content开头的Uri互相转换

将content:// uri转换为文件路径

android图片文件的路径地址与Uri的相互转换

如何从 Uri xamarin android 获取实际路径