设备脱机时，StorageReference.getFile（）会崩溃
当我尝试使用方法StorageReference.getFile(File)从Firebase Storage下载文件时，它在设备处于脱机状态并达到超时时崩溃。 Logcat在DynamicModulesC中显示NPE：
java.lang.NullPointerException: null reference
at asn.a(:com.google.android.gms.DynamiteModulesC:27)
当互联网连接可用时，相同的代码正常工作并下载文件。 我已经使用Android 4.1和6.0在设备和模拟器上测试过它。 Firebase SDK版本9.6.1。 这是一个在Firebase SDK中的错误吗？ 我错过了什么？
代码简单：
FirebaseStorage firebaseStorage = FirebaseStorage.getInstance();
//firebaseStorage.setMaxDownloadRetryTimeMillis(15 * 1000);
StorageReference remoteDir= firebaseStorage.getReference().child("dir-with-files");
File destinationFile= new File("file-in-app-internal-storage");
StorageReference fileRef = remoteDir.child("file-from-firebase");
fileRef.getFile(destinationFile);
完整的崩溃日志：
10-02 10:49:57.577 9429-9464/com.github.lecho.mobilization W/System: ClassLoader referenced unknown path: /system/priv-app/PrebuiltGmsCore/lib/x86_64
10-02 10:49:57.610 9429-9464/com.github.lecho.mobilization I/DynamiteModule: Considering local module com.google.android.gms.firebasestorage:0 and remote module com.google.android.gms.firebasestorage:1
10-02 10:49:57.610 9429-9464/com.github.lecho.mobilization I/DynamiteModule: Selected remote version of com.google.android.gms.firebasestorage, version >= 1
10-02 10:49:57.628 9429-9464/com.github.lecho.mobilization W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_chimera/m/00000002/n/x86_64
10-02 10:50:11.599 9429-9462/com.github.lecho.mobilization W/ExponenentialBackoff: network unavailable, sleeping.
10-02 10:50:11.599 9429-9462/com.github.lecho.mobilization E/StorageUtil: error getting token java.util.concurrent.ExecutionException: com.google.firebase.FirebaseApiNotAvailableException: firebase-auth is not linked, please fall back to unauthenticated mode.
10-02 10:50:12.234 9429-9464/com.github.lecho.mobilization W/ExponenentialBackoff: network unavailable, sleeping.
10-02 10:50:12.234 9429-9464/com.github.lecho.mobilization E/StorageUtil: error getting token java.util.concurrent.ExecutionException: com.google.firebase.FirebaseApiNotAvailableException: firebase-auth is not linked, please fall back to unauthenticated mode.
--------- beginning of crash
10-02 10:50:12.236 9429-9464/com.github.lecho.mobilization E/AndroidRuntime: FATAL EXCEPTION: FirebaseStorage-Download-3
Process: com.github.lecho.mobilization, PID: 9429
java.lang.NullPointerException: null reference
at asn.a(:com.google.android.gms.DynamiteModulesC:27)
at bul.d(:com.google.android.gms.DynamiteModulesC:261)
at buf.onTransact(:com.google.android.gms.DynamiteModulesC:76)
at android.os.Binder.transact(Binder.java:387)
at com.google.android.gms.internal.zzans$zza$zza.aE(Unknown Source)
at com.google.android.gms.internal.zzanv.aE(Unknown Source)
at com.google.firebase.storage.FileDownloadTask.run(Unknown Source)
at com.google.firebase.storage.StorageTask$5.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
10-02 10:50:12.237 1540-1997/system_process W/ActivityManager: Force finishing activity com.github.lecho.mobilization/.ui.MainActivity
[ 10-02 10:50:12.246 1540: 1997 D/ ]
HostConnection::get() New Host Connection established 0x7f39f896fc00, tid 1997
原来是Google Play服务中的一个错误。 Firebase团队已经修复了它。 该修补程序在Google Play服务的9.8.77版本中提供。
现在，当设备处于脱机状态时， StorageReference.getFile(File)不会使应用程序崩溃。 相反，您会收到以下回复：
E/StorageException: StorageException has occurred.
The operation retry limit has been exceeded.
Code: -13030 HttpResult: -2
尝试这个：
try{
fileRef.getFile(destinationFile).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
@Override
public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
// Local temp file has been created
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
// Handle any errors
}
});
} catch (Exception e){
// Error
}
另外，我们可以做以下事情：1.添加try catch块来处理在下载文件时被调用的任何异常。 2.将存储引用保存为onSaveInstanceState中的引用。 稍后，我们可以调用RestoreInstanceState。
StorageReference mStorageRef; //mStorageRef was previously used to transfer data.
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// If there's a download in progress, save the reference so you can query it later
if (mStorageRef != null) {
outState.putString("reference", mStorageRef.toString());
}
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
// If there was a download in progress, get its reference and create a new StorageReference
final String stringRef = savedInstanceState.getString("reference");
if (stringRef == null) {
return;
}
mStorageRef = FirebaseStorage.getInstance().getReferenceFromUrl(stringRef);
// Find all DownloadTasks under this StorageReference (in this example, there should be one)
List tasks = mStorageRef.getActiveDownloadTasks();
if (tasks.size() > 0) {
// Get the task monitoring the download
DownloadTask task = tasks.get(0);
// Add new listeners to the task using an Activity scope
task.addOnSuccessListener(this, new OnSuccessListener() {
@Override
public void onSuccess(DownloadTask.TaskSnapshot state) {
handleSuccess(state); //call a user defined function to handle the event.
}
});
}
}
您需要使用getFile（）方法在线下载文件并在本地保存文件。 然后在离线后使用本地保存的文件。 脱机时，无法使用getFile（）方法下载文件。 请阅读文档：https://firebase.google.com/docs/storage/android/download-files
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