Android 如何从图库中获取视频文件的缩略图
Android how can i get thumb image of video file from gallery
我需要在我的列表视图中显示从图库中选择的视频文件。
我已成功获取视频文件的 uri,但无法获取视频文件的缩略图。这是我用于从 uri 获取视频文件图像的代码,但会导致应用程序崩溃。有没有其他方法可以获取视频文件的图像..?如果可以通过任何其他方式实现,请帮助我....
public static String getFileMetaData(Context context,String uri){
Uri queryUri = Uri.parse(uri);
// Get relevant columns for use later.
String[] projection = {
MediaStore.Files.FileColumns._ID,
MediaStore.Files.FileColumns.DATA,
MediaStore.Files.FileColumns.DATE_ADDED,
MediaStore.Files.FileColumns.MEDIA_TYPE,
MediaStore.Files.FileColumns.MIME_TYPE,
MediaStore.Files.FileColumns.TITLE
};
// Return only video and image metadata.
String selection = MediaStore.Files.FileColumns.MEDIA_TYPE + "="
+ MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE
+ " OR "
+ MediaStore.Files.FileColumns.MEDIA_TYPE + "="
+ MediaStore.Files.FileColumns.MEDIA_TYPE_VIDEO;
CursorLoader cursorLoader = new CursorLoader(
context,
queryUri,
projection,
selection,
null, // Selection args (none).
MediaStore.Files.FileColumns.DATE_ADDED + " DESC" // Sort order.
);
Cursor cursor = cursorLoader.loadInBackground();
int columnIndex = cursor.getColumnIndex(MediaStore.Video.Thumbnails.DATA);
Log.d("MyTag","***************** : " + cursor.getString(columnIndex));
cursor.close();
return null;
}
首先您必须从视频文件 uri 中获取视频文件的文件路径,然后从文件路径中您可以生成视频缩略图。
您可以像这样使用 ThumbnailUtils class 的 createVideoThumbnail 方法获取缩略图。
video_imageview.setImageBitmap(ThumbnailUtils.createVideoThumbnail(selectedVideoFilePath, MediaStore.Video.Thumbnails.FULL_SCREEN_KIND));
其中selectedVideoFilePath为视频文件路径。您可以使用此获取文件路径。
String selectedVideoFilePath = GetFilePathFromDevice.getPath(this, videoFileUri);
您可以使用 GetFilePathFromDevice class 从给定的 Uri 获取文件路径。
GetFilePathFromDevice.java
@SuppressLint("NewApi")
public final class GetFilePathFromDevice {
/**
* Get file path from URI
*
* @param context context of Activity
* @param uri uri of file
* @return path of given URI
*/
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];
}
}
// 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 the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
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 index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
}
希望对您有所帮助!
通过一些更改解决了这个问题。实际上我的问题是我给出的文件路径是 wrong.I 一直在给出从画廊获得的 Uri,
现在我已经更改了从 Uri 获取真实路径的代码,并且
然后将它们应用到 ThumbnailUtils 以创建缩略图。
Uri uri = Uri.parse(uri);
String mUri = AppUtils.getRealPathFromURI(mActivity,uri,"VIDEO");
mImageSend.setImageBitmap(ThumbnailUtils.createVideoThumbnail(
mUri, MediaStore.Video.Thumbnails.FULL_SCREEN_KIND));
public static String getRealPathFromURI(Context context,Uri contentURI,String type) {
String result = null;
try {
Cursor cursor = context.getContentResolver().query(contentURI, null, null, null, null);
if (cursor == null) { // Source is Dropbox or other similar local file path
result = contentURI.getPath();
Log.d("TAG", "result******************" + result);
} else {
cursor.moveToFirst();
int idx = 0;
if(type.equalsIgnoreCase("IMAGE")){
idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
}else if(type.equalsIgnoreCase("VIDEO")){
idx = cursor.getColumnIndex(MediaStore.Video.VideoColumns.DATA);
}else if(type.equalsIgnoreCase("AUDIO")){
idx = cursor.getColumnIndex(MediaStore.Audio.AudioColumns.DATA);
}
result = cursor.getString(idx);
Log.d("TAG", "result*************else*****" + result);
cursor.close();
}
} catch (Exception e){
Log.e("TAG", "Exception ",e);
}
return result;
}
我需要在我的列表视图中显示从图库中选择的视频文件。 我已成功获取视频文件的 uri,但无法获取视频文件的缩略图。这是我用于从 uri 获取视频文件图像的代码,但会导致应用程序崩溃。有没有其他方法可以获取视频文件的图像..?如果可以通过任何其他方式实现,请帮助我....
public static String getFileMetaData(Context context,String uri){
Uri queryUri = Uri.parse(uri);
// Get relevant columns for use later.
String[] projection = {
MediaStore.Files.FileColumns._ID,
MediaStore.Files.FileColumns.DATA,
MediaStore.Files.FileColumns.DATE_ADDED,
MediaStore.Files.FileColumns.MEDIA_TYPE,
MediaStore.Files.FileColumns.MIME_TYPE,
MediaStore.Files.FileColumns.TITLE
};
// Return only video and image metadata.
String selection = MediaStore.Files.FileColumns.MEDIA_TYPE + "="
+ MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE
+ " OR "
+ MediaStore.Files.FileColumns.MEDIA_TYPE + "="
+ MediaStore.Files.FileColumns.MEDIA_TYPE_VIDEO;
CursorLoader cursorLoader = new CursorLoader(
context,
queryUri,
projection,
selection,
null, // Selection args (none).
MediaStore.Files.FileColumns.DATE_ADDED + " DESC" // Sort order.
);
Cursor cursor = cursorLoader.loadInBackground();
int columnIndex = cursor.getColumnIndex(MediaStore.Video.Thumbnails.DATA);
Log.d("MyTag","***************** : " + cursor.getString(columnIndex));
cursor.close();
return null;
}
首先您必须从视频文件 uri 中获取视频文件的文件路径,然后从文件路径中您可以生成视频缩略图。
您可以像这样使用 ThumbnailUtils class 的 createVideoThumbnail 方法获取缩略图。
video_imageview.setImageBitmap(ThumbnailUtils.createVideoThumbnail(selectedVideoFilePath, MediaStore.Video.Thumbnails.FULL_SCREEN_KIND));
其中selectedVideoFilePath为视频文件路径。您可以使用此获取文件路径。
String selectedVideoFilePath = GetFilePathFromDevice.getPath(this, videoFileUri);
您可以使用 GetFilePathFromDevice class 从给定的 Uri 获取文件路径。
GetFilePathFromDevice.java
@SuppressLint("NewApi")
public final class GetFilePathFromDevice {
/**
* Get file path from URI
*
* @param context context of Activity
* @param uri uri of file
* @return path of given URI
*/
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];
}
}
// 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 the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
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 index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
}
希望对您有所帮助!
通过一些更改解决了这个问题。实际上我的问题是我给出的文件路径是 wrong.I 一直在给出从画廊获得的 Uri, 现在我已经更改了从 Uri 获取真实路径的代码,并且 然后将它们应用到 ThumbnailUtils 以创建缩略图。
Uri uri = Uri.parse(uri);
String mUri = AppUtils.getRealPathFromURI(mActivity,uri,"VIDEO");
mImageSend.setImageBitmap(ThumbnailUtils.createVideoThumbnail(
mUri, MediaStore.Video.Thumbnails.FULL_SCREEN_KIND));
public static String getRealPathFromURI(Context context,Uri contentURI,String type) {
String result = null;
try {
Cursor cursor = context.getContentResolver().query(contentURI, null, null, null, null);
if (cursor == null) { // Source is Dropbox or other similar local file path
result = contentURI.getPath();
Log.d("TAG", "result******************" + result);
} else {
cursor.moveToFirst();
int idx = 0;
if(type.equalsIgnoreCase("IMAGE")){
idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
}else if(type.equalsIgnoreCase("VIDEO")){
idx = cursor.getColumnIndex(MediaStore.Video.VideoColumns.DATA);
}else if(type.equalsIgnoreCase("AUDIO")){
idx = cursor.getColumnIndex(MediaStore.Audio.AudioColumns.DATA);
}
result = cursor.getString(idx);
Log.d("TAG", "result*************else*****" + result);
cursor.close();
}
} catch (Exception e){
Log.e("TAG", "Exception ",e);
}
return result;
}