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";
}
}
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