来自媒体商店的 Android 视频文件路径为空 [英] Android video file path from media store is coming as null

问题描述

我正在尝试获取视频缩略图的视频文件路径.我不知道为什么我根据这里的一些解决方案修改后它仍然为空.安卓版本是6.0.1.

用户点击浮动操作按钮并召唤视频库.

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.addNote);fab.setOnClickListener(new View.OnClickListener() {@覆盖公共无效onClick(查看视图){意图意图=新意图()；intent.setType("video/*");Intent.setAction(Intent.ACTION_GET_CONTENT);startActivityForResult(Intent.createChooser(intent, "Select Video"), REQUEST_TAKE_GALLERY_VIDEO);}});

当用户从图库中选择一个想要的视频时，该视频会转到它会被整理出来的活动.

@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);如果(resultCode == RESULT_OK){uri uri = data.getData();Log.d(TAG, "Uri: " + uri);Log.d(TAG, "Uri 权限:" + uri.getAuthority());String filemanagerstring = uri.getPath();Log.d(TAG, "filemanagerstring:" + filemanagerstring);String selectedImagePath = getPath(uri);Log.d(TAG, "selectedImagePath: " + selectedImagePath);}}

获取视频文件路径的方法.

public String getPath(Uri uri) {Cursor cursor = this.getContentResolver().query(uri, null, null, null, null);int idx = 0;//来源不是来自设备捕获或选择如果(光标==空){返回 uri.getPath();} 别的 {cursor.moveToFirst();idx = cursor.getColumnIndex(MediaStore.Video.VideoColumns.DATA);如果(idx == -1){Log.d(TAG, "uri 路径:" + path);返回 uri.getPath();}}字符串路径 = cursor.getString(idx);Log.d(TAG, "路径:" + 路径);游标.关闭()；返回路径；}

结果:我得到了空值 (-1) 并得到了 uri 的路径，这不是正确的路径.我需要视频文件的完整路径.

Uri: content://com.android.providers.media.documents/document/video%3A6174Uri 权限:com.android.providers.media.documents文件管理器字符串:/document/video:6174**uri 路径:16842794**selectedImagePath:/document/video:6174

解决方案

并召唤视频库

不，它没有.它允许用户从任何支持 ACTION_GET_CONTENT 的 video/* 的 MIME 类型的活动中进行选择.您返回的 Uri 可以来自任何东西，不一定是图库"应用程序，也不一定是指向文件的应用程序.Uri 可以指向:

• 外部存储上的文件，您可能可以直接读取
• 可移动存储上的文件，您无法访问
• 某个其他应用程序的内部存储文件
• 数据库中BLOB列的内容
• 必须即时解密的东西
• 设备上尚不存在且需要下载的内容
• 等等

<块引用>

获取视频文件路径的方法

可靠地，您可以从 query() 返回的唯一值是 OpenableColumns，用于内容的大小和显示名称".

您需要:

• 使用接受 content Uri 作为参数的缩略图引擎，或者

• 使用 ContentResolver 和 openInputStream() 获取内容的 InputStream，然后使用一些接受 InputStream 的缩略图引擎code>InputStream 作为参数，或者

• 使用 ContentResolver 和 openInputStream() 获取内容的 InputStream，然后使用该流制作您自己的文件包含内容中字节的副本，因此您可以将自己的文件与一些需要文件的缩略图引擎一起使用，或者

• 不要使用 ACTION_GET_CONTENT，而是通过向 MediaStore 询问所有视频来呈现您自己的选择器"用户界面，因为您可以获得这些视频的缩略图来自 MediaStore(请参阅此示例应用)

I am trying to get the path of the video file for a video thumbnail. I'm not sure why it is still coming as null after I modified based on some solutions here. The version of android is 6.0.1.

The user clicks the floating action button and summons a gallery of videos.

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.addNote);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent();
            intent.setType("video/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent, "Select Video"), REQUEST_TAKE_GALLERY_VIDEO);
        }
    });

When the user selects a desired video from the gallery, the video goes to the activity which it'll be sorted out.

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {

        Uri uri = data.getData();
        Log.d(TAG, "Uri: " + uri);

        Log.d(TAG, "Uri authority: " + uri.getAuthority());

        String filemanagerstring = uri.getPath();
        Log.d(TAG, "filemanagerstring: " + filemanagerstring);

        String selectedImagePath = getPath(uri);
        Log.d(TAG, "selectedImagePath: " + selectedImagePath);
    }
}

The method to get the path of the video file.

public String getPath(Uri uri) {

    Cursor cursor = this.getContentResolver().query(uri, null, null, null, null);
    int idx = 0;

    //Source not from device capture or selection
    if (cursor == null) {
        return uri.getPath();
    } else {
        cursor.moveToFirst();
        idx = cursor.getColumnIndex(MediaStore.Video.VideoColumns.DATA);
        if (idx == -1) {
            Log.d(TAG, "uri path: " + path);
            return uri.getPath();
        }
    }
    String path =  cursor.getString(idx);
    Log.d(TAG, "path: " + path);
    cursor.close();
    return path;
}

Results: I got the null (-1) and got the uri's path, that's not the correct path. I need the full path of the video file.

Uri: content://com.android.providers.media.documents/document/video%3A6174
Uri authority: com.android.providers.media.documents
filemanagerstring: /document/video:6174
**uri path: 16842794**
selectedImagePath: /document/video:6174

解决方案

and summons a gallery of videos

No, it does not. It allows the user to choose from any activity that supports ACTION_GET_CONTENT for a MIME type of video/*. The Uri that you get back can be from anything, not necessarily a "gallery" app, and not necessarily one that points to a file. The Uri could point to:

• A file on external storage, one that you might be able to read directly
• A file on removable storage, which you cannot access
• A file on internal storage of some other app
• The contents of a BLOB column in a database
• Something that has to be decrypted on the fly
• Something that does not yet exist on the device and needs to be downloaded
• And so on

The method to get the path of the video file

The only values you can get back from that query(), reliably, are the OpenableColumns, for the size and "display name" of the content.

You need to either:

• Use a thumbnail engine that accepts a content Uri as a parameter, or

• Use ContentResolver and openInputStream() to get an InputStream on the content, then use some thumbnail engine that accepts an InputStream as a parameter, or

• Use ContentResolver and openInputStream() to get an InputStream on the content, then use that stream to make your own file that contains a copy of the bytes from the content, so you can use your own file with some thumbnail engine that requires a file, or

• Do not use ACTION_GET_CONTENT, but instead render your own "chooser" UI by asking the MediaStore for all videos, as you can get thumbnails of those videos from MediaStore (see this sample app)

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