从firebase存储下载图片失败：android [英] Downloading an Image from firebase storage fails: android
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问题描述
此代码用于将图片上传到Firebase存储。
//获取照片上存储文件的引用/< FILENAME>
StorageReference photoRef = mPhotosStorageReference.child（selectedImageUri.getLastPathSegment（））;
//将文件上传到Firebase存储
photoRef.putFile（selectedImageUri）.addOnSuccessListener（this，new OnSuccessListener< UploadTask.TaskSnapshot>（）{
@Override
public void onSuccess（UploadTask.TaskSnapshot taskSnapshot）{
Log.d（TAG，成功上传文件的方法）;
//当图片成功上传时，下载URL
@SuppressWarnings（VisibleForTests）
Uri downloadUrl = taskSnapshot.getDownloadUrl（）;
//将下载URL设置为消息框，以便用户可以将它发送给数据库
Message message = new Message（null，userName，downloadUrl.toString（））;
messagesDatabaseReference.push（）。setValue（message）;
mProgressBar.setVisibility .GONE）;
Toast.makeText（MainActivity.this，Upload Successful，Toast.LENGTH_SHORT）.show（）;
}
}）;
请注意，我使用以下方法创建本地图像文件：
文件localFile = null;
try {
localFile = File.createTempFile（images，jpg，getExternalFilesDir（null））;
Log.d（TAG，local file：+ localFile.getAbsolutePath（））;
} catch（IOException e）{
e.printStackTrace（）;
$ / code> 这里我采用了相同的 photoRef 来下载用户上传的特定图片。这是一个正确的方式吗？
photoRef.getFile（localFile）.addOnSuccessListener（new OnSuccessListener< FileDownloadTask.TaskSnapshot> （）{
@Override
public void onSuccess（FileDownloadTask.TaskSnapshot taskSnapshot）{
//创建了本地临时文件
Log.d（TAG，Entered onSuccess在下载文件*）;
Toast.makeText（MainActivity.this，Download Success，Toast.LENGTH_SHORT）.show（）;
}
}）。addOnFailureListener（new OnFailureListener ）{
@Override
public void onFailure（@NonNull异常异常）{
//处理任何错误
Log.d（TAG，Entered onFailure in Download File * ）;
Toast.makeText（MainActivity.this，Download Failed，Toast.LENGTH_SHORT）.show（）;
}
}）;
我记录了 photoRef 和本地文件。这显示在我的 LogCat 上。
Photoref：gs：//wecare-8a15d.appspot.com / photos / image：27410
本地文件：/storage/emulated/0/Android/data/com.pc.wecare/files/images2116155570jpg
这是我在使用exception.getMessage（）时得到的异常;
Excecption消息：对象在位置不存在。
这是 LogCat 的详细信息。它显示从从图库中提取照片并将其上传到Firebase存储：
05-03 11：25：11.600 8577- 8577 / com.pc.wecare D / TAG：在主要活动中暂停方法
05-03 11：25：20.277 8577-8577 / com.pc.wecare D / TAG：输入OnActivity照片选取器方法
05-03 11：25：20.277 8577-8577 / com.pc.wecare D / TAG：onActivityResult，requestCode：2，resultCode：-1
05-03 11：25：20.278 8577-8577 / com.pc .wecare D / TAG：onActivityResult，RC_PHOTO_PICKER：2，RESULT_OK：-1
05-03 11：25：20.310 8577-8577 / com.pc.wecare D / TAG：本地文件：/ storage / emulated / 0 /Android/data/com.pc.wecare/files/images306346474jpg
05-03 11：25：20.310 8577-8577 / com.pc.wecare D / TAG：Photoref：gs：//wecare-8a15d.appspot /主要活动简历方法
05-03 12：58：14.730 31570-31570 / com.pc.wecare D / TAG：输入失败下载文件*
05-03 12：58：17.234 31570-31570 / com.pc.wecare D / TAG：in Success meth上传文件
解决方案
-
File.createTempFile（fileName，null，context.getCacheDir（））;
这不是文件扩展名
请检查您的文件路径
/storage/emulated/0/Android/data/com.pc.wecare/files/ images2116155570jpg
images211615557 0.jpg
Downloading the image and storing it on SD card doesn't work. I don't know where I'm going wrong.
This code is for uploading an Image to Firebase Storage.
// Get a reference to store file at photos/<FILENAME>
StorageReference photoRef = mPhotosStorageReference.child(selectedImageUri.getLastPathSegment());
//Upload file to Firebase Storage
photoRef.putFile(selectedImageUri).addOnSuccessListener(this, new OnSuccessListener < UploadTask.TaskSnapshot > () {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Log.d("TAG", "in Success method of Uploading file");
// When the image has successfully uploaded, we get its download URL
@SuppressWarnings("VisibleForTests")
Uri downloadUrl = taskSnapshot.getDownloadUrl();
// Set the download URL to the message box, so that the user can send it to the database
Message message = new Message(null, userName, downloadUrl.toString());
messagesDatabaseReference.push().setValue(message);
mProgressBar.setVisibility(View.GONE);
Toast.makeText(MainActivity.this, "Upload Successful", Toast.LENGTH_SHORT).show();
}
});
Note that, I used the following for creating the local image file:
File localFile = null;
try {
localFile = File.createTempFile("images", "jpg", getExternalFilesDir(null));
Log.d("TAG", "local file: " + localFile.getAbsolutePath());
} catch (IOException e) {
e.printStackTrace();
}
Here I'm taking the same photoRef to download that particular image the user uploads. Is this a right way of doing?
photoRef.getFile(localFile).addOnSuccessListener(new OnSuccessListener < FileDownloadTask.TaskSnapshot > () {
@Override
public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
// Local temp file has been created
Log.d("TAG", "Entered onSuccess in Download File*");
Toast.makeText(MainActivity.this, "Download Success", Toast.LENGTH_SHORT).show();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
// Handle any errors
Log.d("TAG", "Entered onFailure in Download File*");
Toast.makeText(MainActivity.this, "Download Failed", Toast.LENGTH_SHORT).show();
}
});
I logged the value of photoRef and local file. This showed on my LogCat.
Photoref: gs://wecare-8a15d.appspot.com/photos/image:27410
local file: /storage/emulated/0/Android/data/com.pc.wecare/files/images2116155570jpg
This is the exception that I got when i used exception.getMessage();
Excecption message: Object does not exist at location.
This are the details from LogCat. It shows from picking up a photo from gallery and uploading it to Firebase Storage:
05-03 11:25:11.600 8577-8577/com.pc.wecare D/TAG: In Main Activity Pause Method
05-03 11:25:20.277 8577-8577/com.pc.wecare D/TAG: Entered OnActivity photo picker method
05-03 11:25:20.277 8577-8577/com.pc.wecare D/TAG: onActivityResult, requestCode: 2, resultCode: -1
05-03 11:25:20.278 8577-8577/com.pc.wecare D/TAG: onActivityResult, RC_PHOTO_PICKER: 2, RESULT_OK: -1
05-03 11:25:20.310 8577-8577/com.pc.wecare D/TAG: local file: /storage/emulated/0/Android/data/com.pc.wecare/files/images306346474jpg
05-03 11:25:20.310 8577-8577/com.pc.wecare D/TAG: Photoref: gs://wecare-8a15d.appspot.com/photos/image:27301
05-03 11:25:20.313 8577-8577/com.pc.wecare D/TAG: In Main Activity Resume Method
05-03 12:58:14.730 31570-31570/com.pc.wecare D/TAG: Entered onFailure in Download File*
05-03 12:58:17.234 31570-31570/com.pc.wecare D/TAG: in Success method of Uploading file
解决方案
please check your permission in manifest
File.createTempFile( fileName, null, context.getCacheDir());
This is not file extension
please check your file path
/storage/emulated/0/Android/data/com.pc.wecare/files/images2116155570jpg images2116155570.jpg
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