java.lang.NullPointerException：尝试调用虚拟方法'com.google.firebase.storage.StorageReference com.google.firebase.storage.StorageReference.child（java.lang.String）' 在null对象上引用java.lang.NullPointerException：尝试 调用虚拟方法'com.google.firebase.storage.StorageReference com.google.firebase.storage.StorageReference.child（java.lang.String）' 在空对象引用上
SendingData.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sending_data);
try {
FirebaseOptions options = new FirebaseOptions.Builder()
.setApplicationId("-----")
.setApiKey("-------")
.setDatabaseUrl("-------")
.build();
FirebaseApp.initializeApp(this, options, "second_database_name");
FirebaseApp secondApp = FirebaseApp.getInstance("second_database_name");
FirebaseStorage storage = FirebaseStorage.getInstance(secondApp, "---------");
mDatabaseRef = FirebaseDatabase.getInstance(secondApp).getReference("Data");
mStorageRef = storage.getReference("DataStorage");
} catch (Exception e) {
}
try {
textInputName = findViewById(R.id.input_layout_name);
textInputJop = findViewById(R.id.input_layout_jop);
textInputPhone = findViewById(R.id.input_layout_phone);
textInputPlace = findViewById(R.id.input_layout_place);
edit_name = findViewById(R.id.edit_name);
edit_jop = findViewById(R.id.edit_jop);
edit_phone = findViewById(R.id.edit_phone);
edit_place = findViewById(R.id.edit_place);
button = findViewById(R.id.btn_save);
mImageView = findViewById(R.id.profile_image_card);
mImageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
SetImage();
}
});
} catch (Exception e) {
}
try {
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (!validateJop() | !validateName() | !validatePhone() | !validatePlace()) {
return;
}
uploadFile();
}
});
} catch (Exception e) {
}
}
private void SetImage() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, REQUEST_CODE_PROFILE);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_CODE_PROFILE && resultCode == RESULT_OK && data != null && data.getData() != null) {
filePath = data.getData();
Picasso.get().load(filePath).into(mImageView);
}
}
private boolean validateName() {
String name = edit_name.getText().toString().trim();
if (name.isEmpty()) {
textInputName.setError("يرجى ادخال البيانات");
return false;
} else if (name.length() > 20) {
textInputName.setError("لا تتجاوز الحد المسموح");
return false;
} else {
textInputName.setError(null);
return true;
}
}
private boolean validateJop() {
String Jop = edit_jop.getText().toString().trim();
if (Jop.isEmpty()) {
textInputJop.setError("يرجى ادخال البيانات");
return false;
} else {
textInputJop.setError(null);
return true;
}
}
private boolean validatePhone() {
String Phone = edit_phone.getText().toString().trim();
if (Phone.isEmpty()) {
textInputPhone.setError("يرجى ادخال البيانات");
return false;
} else {
textInputPhone.setError(null);
return true;
}
}
private boolean validatePlace() {
String Place = edit_place.getText().toString().trim();
if (Place.isEmpty()) {
textInputPlace.setError("يرجى ادخال البيانات");
return false;
} else {
textInputPlace.setError(null);
return true;
}
}
private String getFileExtension(Uri filePath) {
ContentResolver cR = getContentResolver();
MimeTypeMap mam = MimeTypeMap.getSingleton();
return mam.getExtensionFromMimeType(cR.getType(filePath));
}
private void uploadFile() {
if (filePath != null) {
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.show();
final StorageReference fileReference = mStorageRef.child("DiskStorage").child(filePath.getLastPathSegment());
fileReference.putFile(filePath).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
progressDialog.dismiss();
}
}).addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
@Override
public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
double progress = (100.0 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();
//displaying percentage in progress dialog
progressDialog.setMessage("يتم ارسال البيانات %" + "..." + " " + ((int) progress));
}
}).continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
@Override
public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
if (!task.isSuccessful()) {
throw task.getException();
}
return fileReference.getDownloadUrl();
}
}).addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(@NonNull Uri downloadUri) {
progressDialog.dismiss();
Toast.makeText(SendingData.this, "تم ارسال البيانات بنجاح", Toast.LENGTH_SHORT).show();
Worker_Item upload = new Worker_Item(downloadUri.toString(),
edit_name.getText().toString().trim(),
edit_jop.getText().toString().trim()
, edit_phone.getText().toString().trim(),
edit_place.getText().toString().trim());
String uploadId = mDatabaseRef.push().getKey();
assert uploadId != null;
mDatabaseRef.child(uploadId).setValue(upload);
}
});
}
}
}