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
日志一打印出来我就明白是什么原因啦。这什么东西在Android 4.4前后不一样，4.4之前content后面是文件全路径，4.4之后不再直接表示路径啦。这就好办啦，翻了翻API后发现4.4以后的Uri还不唯一，并不是统一的一种格式，所以就来个通用解决办法好啦：
插播一条
以下是4.2.2之后，4.4以前managedQuery方法被废弃后的解决方案：
public String getRealPathFromURI(Uri contentUri) {
String res = null;
String[] proj = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null);
if(cursor.moveToFirst()){;
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
res = cursor.getString(column_index);
}
cursor.close();
return res;
}
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。
public static String getPathByUri(Context context, Uri data) {
String filename=null;
if (data.getScheme().toString().compareTo("content") == 0) {
Cursor cursor = context.getContentResolver().query(data, new String[] { "_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";
}
}
return filename;
}
4.4以后根据Uri获取路径：
// 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 getPathByUri4kitkat(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
if (isExternalStorageDocument(uri)) {// ExternalStorageProvider
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];
}
} else if (isDownloadsDocument(uri)) {// DownloadsProvider
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);
} else if (isMediaDocument(uri)) {// MediaProvider
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);
}
} else if ("content".equalsIgnoreCase(uri.getScheme())) {// MediaStore
// (and
// general)
return getDataColumn(context, uri, null, null);
} else if ("file".equalsIgnoreCase(uri.getScheme())) {// File
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());
}
安卓2.3.3 & 4.0.4 & 4.4 & 5.1.1 & 6.0真机亲测都正常，欢迎拷贝！
最后，附上一个Video项目用到的相关函数供参考：
//return the id of URI
public static int getVideoUriByPath(Uri resultUri, Activity activity, String path){
resultUri= null;
int id=-1;
if(activity==null || path==null)
return id;
Uri preUri = Uri.parse("content://media/external/video/media/");
@SuppressWarnings("deprecation")
Cursor cursor = activity.managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Video.Media.DEFAULT_SORT_ORDER);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
String data = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));
if (path.equals(data)) {
id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID));
resultUri = Uri.withAppendedPath(preUri, "" + id);
break;
}
cursor.moveToNext();
}
return id;
}