重新打开应用程序后,可以从URI播放视频
我让用户从画廊中选择一个视频,然后保存视频的URI供将来使用。但是,在我关闭应用程序并重新打开它之后,视频不再播放了 这是我用于从画廊中选择的视频使用的目的
private void pickVideoFromGallery() {
Intent opengalleryIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
opengalleryIntent.addCategory(Intent.CATEGORY_OPENABLE);
opengalleryIntent.setType("video/*");
opengalleryIntent.setFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
| Intent.FLAG_GRANT_READ_URI_PERMISSION
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
startActivityForResult(opengalleryIntent, RESULT_LOAD_VIDEO);
}
,我将视频UI作为字符串
String videoPath = data.getData().toString();
使用:
String videoPath= getIntent().getStringExtra("videoPath"); //From PendingIntent in ForegroundService
viFriendCall.setVideoURI(Uri.parse(videoPath));
viFriendCall.setOnPreparedListener(mp -> mp.setLooping(true));
viFriendCall.start();
这是错误消息,我得到的
E/MediaPlayerNative: Unable to create media player
W/VideoView: Unable to open content: content://com.android.providers.media.documents/document/video%3A9922
java.io.IOException: setDataSource failed.: status=0x80000000
at android.media.MediaPlayer.nativeSetDataSource(Native Method)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1209)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1196)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1107)
I let the user select a video from the gallery then I save the uri of the video for future use. But after I close the app and reopen it, the video can't play anymore
This is intent i use for select video from gallery
private void pickVideoFromGallery() {
Intent opengalleryIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
opengalleryIntent.addCategory(Intent.CATEGORY_OPENABLE);
opengalleryIntent.setType("video/*");
opengalleryIntent.setFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
| Intent.FLAG_GRANT_READ_URI_PERMISSION
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
startActivityForResult(opengalleryIntent, RESULT_LOAD_VIDEO);
}
I save the video uri as a string
String videoPath = data.getData().toString();
Use:
String videoPath= getIntent().getStringExtra("videoPath"); //From PendingIntent in ForegroundService
viFriendCall.setVideoURI(Uri.parse(videoPath));
viFriendCall.setOnPreparedListener(mp -> mp.setLooping(true));
viFriendCall.start();
And this is the error message i get
E/MediaPlayerNative: Unable to create media player
W/VideoView: Unable to open content: content://com.android.providers.media.documents/document/video%3A9922
java.io.IOException: setDataSource failed.: status=0x80000000
at android.media.MediaPlayer.nativeSetDataSource(Native Method)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1209)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1196)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1107)
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此错误出现在Android 11及更高版本上。最初承认关闭应用程序后,您的URI将不再可以访问该文件。这是Android 11版本的新更新,您可以读取它在这里
有一个简单的解决方案。如果要访问该文件以供以后在应用中使用,则该条目将其从原始位置复制到应用程序的缓存或文件目录。
您会发现很多文档。当您首先获取文件的URI时,只需将文件保存到文件目录中即可。
This error appears on devices android 11 and above. Originally admitted that after closing the app your uri no longer has access to the file.This is a new update from android 11 version, you can read it here
There's one simple solution to it. If you want to access the file for later use in your app, the entry copying it from the original location to your app's cache or files directory.
You'll find plenty of documents on it. Just save your file into the files directory when you first get the URI of your files.
您必须在Android中使用缓存来保存数据以备将来使用
房间数据(可以用于复杂数据,例如对象,类): https://developer.android.com/training/data-storage/room
数据存储(可用于存储原始数据类型)
https://developer.android.com/主题/库/架构/datastore?gclsrc = aw.ds& gclid = cj0kcqjwmpssbhcnarisah3cygakcy6vvbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj7wdk8ebvtk8ebvtk8ebvtffpwsbo3ffpwsbo3funjym6funjym6funjym6uc2gkfygkfygkfygeamurealalealwcbb
初始化将从内存中清除,当用户返回时到该应用程序所有变量将从新鲜初始化
You have to use caching in Android to save your data for future use
Room data (can be use for complex data such as object, classes): https://developer.android.com/training/data-storage/room
Data store (can be use to store the primitive data types)
https://developer.android.com/topic/libraries/architecture/datastore?gclsrc=aw.ds&gclid=Cj0KCQjwmPSSBhCNARIsAH3cYgaKcy6vvBjj2320H6OSog7Wdk8eBVtFrpwsBO3fuNJYm6uc2GKFYGEaAmUrEALw_wcB
And the problem with your code is when user close the app, all variable that you initialized will be cleared from the memory and when user comes back to the app all variable will be initialized from fresh