为什么图像上传在 Firebase 存储中失败？ [复制]

Question

可以通过单击“选择图像”按钮来选择图像，它将显示在图像视图中 单击“保存图像”后将上传到 Firebase 存储。如果成功，则有关该图像的数据将上传到实时 Firebase 数据库。但是单击“保存图像”按钮后没有任何反应。那里有什么问题？

这些是我的代码：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button chooseButton,saveButton,displayButton;
    private EditText imagenameEdittext;
    private ImageView imageView;
    private ProgressBar progressBar;
    private Uri imageUri;
    private StorageReference storageReference;
    private DatabaseReference  databaseReference;
    private StorageTask uploadTask;

    private static final int IMAGE_REQUEST = 1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        databaseReference = FirebaseDatabase.getInstance().getReference("Upload");
        storageReference = FirebaseStorage.getInstance().getReference("Upload");

        chooseButton = findViewById(R.id.chooseImageButtonid);
        saveButton = findViewById(R.id.saveImageButtonid);
        displayButton = findViewById(R.id.displayImageButtonid);
        progressBar = findViewById(R.id.progressbarid);

        imageView = findViewById(R.id.imageviewid);
        imagenameEdittext = findViewById(R.id.imagenameEdittextid);

        chooseButton.setOnClickListener(this);
        saveButton.setOnClickListener(this);
        displayButton.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {

        switch(view.getId()){

            case R.id.chooseImageButtonid:
                openFileChooser();
                break;
            case R.id.saveImageButtonid:
                if(uploadTask!=null && uploadTask.isInProgress()){
                    Toast.makeText(this, "Uploading in progress", Toast.LENGTH_SHORT).show();
                }
                else{
                    saveData();
                }
                saveData();
                break;
            case R.id.displayImageButtonid:

                break;
        }
    }
    public void openFileChooser(){
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(intent,IMAGE_REQUEST);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode==IMAGE_REQUEST && resultCode==RESULT_OK && data!=null && data.getData()!=null){
            imageUri = data.getData();
            Picasso.get().load(imageUri).into(imageView);
        }
    }

    public String getFileExtension(Uri imageUri){
        ContentResolver contentResolver = getContentResolver();
        MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
        return mimeTypeMap.getExtensionFromMimeType(contentResolver.getType(imageUri));
    }

    private void saveData(){
        final String imageName = imagenameEdittext.getText().toString().trim();
        if(imageName.isEmpty()){
            imagenameEdittext.setError("Enter the image name");
            imagenameEdittext.requestFocus();
            return;
        }
        StorageReference ref = storageReference.child(System.currentTimeMillis()+"."+getFileExtension(imageUri));
        ref.putFile(imageUri)
                .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                        // Get a URL to the uploaded content
                        Toast.makeText(MainActivity.this, "Image is stored Successfully", Toast.LENGTH_SHORT).show();

                        Upload upload = new Upload(imageName,taskSnapshot.getStorage().getDownloadUrl().toString());
                        String uploadId = databaseReference.push().getKey();
                        databaseReference.child(uploadId).setValue(upload);
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception exception) {
                        // Handle unsuccessful uploads
                        Toast.makeText(MainActivity.this, "Image store failed", Toast.LENGTH_SHORT).show();
                    }
                });
    }
}

Answer 1

如果 imageuri 不为空，你能告诉我吗？ 尝试在日志中打印 imageuri 以检查它是否不为空。