Android 4.4 kitkat以上及以下根据uri获取路径的方法

陶瀚玥
2023-12-01

今天我在做视频编辑的时候,遇到了这个问题,前后用了1个小时来发现并解决了这个问题,因为我一直认为是我记错了,后来发现,华为P6用的是Android4.4系统,然后我就恍然了。。。

首先说说我在做什么,我在弄一个拍摄完视频之后,编辑视频的一个东东,这个东东其实不难,源码里有,你们是不是不敢信?!在android源码android.media.videoeditor中有videoeditor这个类,这个其实就是谷歌写的编辑视频的东东,他底层调用了几个C++写的lib库,这些库谷歌也都写好了,我们调用下他即可,然后我在编辑视频的时候,要添加铃声,根据我写的uri获取路径的时候,一直返回null,好奇怪,最后发现华为P6用了4.4系统。。。下面不罗嗦了,直接上代码。

 

这里先看下4.4之前的uri的形式:

 

Uri : content://media/extenral/images/media/17766

 

是不是很熟悉?

再看4.4及以后的Uri形式:

 

content://com.android.providers.media.documents/document/image%2706
我打印出来当时就爆粗口了,这什么东西?!在看P6的系统,果然,4.4的。

 

这就好说了,然后翻了翻API,发现4.4以后的Uri还不唯一,并不是统一的一种格式,所以就来个通用方法好了

 

4.4以前通过Uri获取路径:

data是uri,filename是一个String的字符串,用来保存路径。

 

if (data.getScheme().toString().compareTo("content") == 0) {
									cursor = getContentResolver().query(data,
											new String[] {Audio.Media.DATA}, null, null, null);
									if (cursor.moveToFirst()) {
										filename = cursor.getString(0);
									}
								}else if (data.getScheme().toString().compareTo("file") == 0)         //file:///开头的uri
								{
									filename = data.toString();
									filename = data.toString().replace("file://", "");
									//替换file://
									if(!filename.startsWith("/mnt")){
										//加上"/mnt"头
										filename += "/mnt"; 
									}
								}

4.4以后根据Uri获取路径:

 

 

public class GetPathFromUri4kitkat {

	/**
	 * 专为Android4.4设计的从Uri获取文件绝对路径,以前的方法已不好使
     */
    @SuppressLint("NewApi")
	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());
    }
}

这部分代码借鉴了网上的一些例子,亲测可用,欢迎copy。


来源地址:

http://www.2cto.com/kf/201502/376975.html



 类似资料: