获得空指针异常。知道错误的位置，但不知道如何解决这个问题
package com.lukaut.android.fragments;
import android.Manifest;
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.MimeTypeMap;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.bumptech.glide.Glide;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.SetOptions;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.OnProgressListener;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;
import com.lukaut.android.Model.UserModel;
import com.lukaut.android.R;
import com.squareup.picasso.Picasso;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import static android.app.Activity.RESULT_OK;
/**
* A simple {@link Fragment} subclass.
*/
public class EditProfileFragment extends Fragment {
private static final int STORAGE_PERMISSION_CODE = 23;
private FirebaseAuth mAuth;
UploadTask uploadTask;
public static final int PICK_IMAGE = 1;
ProgressBar progressBar;
FirebaseFirestore firestore;
private static final String TAG = "Editprofile";
@BindView(R.id.edit_fullname)EditText edit_user_fullname;
@BindView(R.id.edit_email)EditText edit_user_email;
@BindView(R.id.edit_mobile)EditText edit_user_phoneno;
@BindView(R.id.edit_age)EditText edit_user_age;
@BindView(R.id.edit_e_fullname_1)EditText edit_e_fullname_1;
@BindView(R.id.edit_e_fullname_2)EditText edit_e_fullname_2;
@BindView(R.id.edit_e_fullname_3)EditText edit_e_fullname_3;
@BindView(R.id.edit_e_number_1)EditText edit_e_number_1;
@BindView(R.id.edit_e_number_2)EditText edit_e_number_2;
@BindView(R.id.edit_e_number_3)EditText edit_e_number_3;
private static final int GALLERY_INTENT = 2;
private StorageReference storageReference,imageRef;
ProgressDialog progressDialog;
Uri selectedImage;
@BindView(R.id.img_user_profile_pic)
ImageView img_user_profile_pic;
public EditProfileFragment() {
// Required empty public constructor
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(false);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_edit_profile, container, false);
ButterKnife.bind(this,v);
getActivity().setTitle("Edit your profile");
firestore = FirebaseFirestore.getInstance();
mAuth = FirebaseAuth.getInstance();
storageReference = FirebaseStorage.getInstance().getReference();
getUserDetails(mAuth.getUid());
return v;
}
private void getUserDetails(String uid) {
firestore.collection("Users").document(mAuth.getUid()).get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
@Override
public void onSuccess(DocumentSnapshot documentSnapshot) {
try {
UserModel userModel = documentSnapshot.toObject(UserModel.class);
//if (!userModel.getUserEmail().isEmpty() || !userModel.getUserEmail().equals("")) {
// loadHomeFragment();
//} else {
edit_user_fullname.setText(userModel.getUserFullName());
edit_user_email.setText(userModel.getUserEmail());
edit_user_age.setText(userModel.getUserAge());
edit_user_phoneno.setText(userModel.getUserPhoneNo());
edit_e_fullname_1.setText(userModel.getEmergency_UserFullName_1());
edit_e_fullname_2.setText(userModel.getEmergency_UserFullName_2());
edit_e_fullname_3.setText(userModel.getEmergency_UserFullName_3());
edit_e_number_1.setText(userModel.getEmergency_UserPhoneNo_1());
edit_e_number_2.setText(userModel.getEmergency_UserPhoneNo_2());
edit_e_number_3.setText(userModel.getEmergency_UserPhoneNo_3());
if (!userModel.getUserProfilePic().equals("") ||!userModel.getUserProfilePic().isEmpty()){
// Glide.with(getActivity()).load(userModel.getUserProfilePic()).into(img_user_profile_pic);
面对下面的错误
Picasso.with(getActivity()).load(userModel.getUserProfilePic()).placeholde r(R.drawable.placeholder).into(img_user_profile_pic);
}
//}
}catch(Exception e){
e.printStackTrace();
Log.d(TAG, "user details " + e.getMessage());
}
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
e.printStackTrace();
}
});
}
@OnClick(R.id.button_save_details)public void saveDetails() {
final String userFullNameText = edit_user_fullname.getText().toString();
final String userEmailText = edit_user_email.getText().toString();
final String userPhoneNoText = edit_user_phoneno.getText().toString();
final String userAgeText = edit_user_age.getText().toString();
final String euserFullName_1 = edit_e_fullname_1.getText().toString();
final String euserFullName_2 = edit_e_fullname_2.getText().toString();
final String euserFullName_3 = edit_e_fullname_3.getText().toString();
final String euserPhoneno_1 = edit_e_number_1.getText().toString();
final String euserPhoneno_2 = edit_e_number_2.getText().toString();
final String euserPhoneno_3 = edit_e_number_3.getText().toString();
String regx = "^[\\p{L} .'-]+$";
CharSequence inputStr = edit_user_fullname.getText().toString();
Pattern pattern = Pattern.compile(regx);
Matcher matcher = pattern.matcher(inputStr);
if (!matcher.matches()) {
Toast.makeText(getActivity(), "Plz enter valid full name", Toast.LENGTH_SHORT).show();
return;
}
if (selectedImage != null) {
imageRef = storageReference.child("profile/" + System.currentTimeMillis() + "." + GetFileExtension(selectedImage));
progressDialog = new ProgressDialog(getActivity());
progressDialog.setMax(100);
progressDialog.setMessage("Uploading...");
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.show();
progressDialog.setCancelable(false);
//starting upload
uploadTask = imageRef.putFile(selectedImage);
// Observe state change events such as progress, pause, and resume
uploadTask.addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
@Override
public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
double progress = (100.0 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();
//sets and increments value of progressbar
progressDialog.incrementProgressBy((int) progress);
}
});
uploadTask.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(getActivity(), "Error in uploading!", Toast.LENGTH_SHORT).show();
progressDialog.dismiss();
}
}).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
// taskSnapshot.getMetadata() contains file metadata such as size, content-type, and download URL.
Uri downloadUrl = taskSnapshot.getDownloadUrl();
Log.d(TAG, "image uploaded at :" + downloadUrl);
final UserModel userModel = new UserModel(mAuth.getUid(), userFullNameText, userEmailText, userPhoneNoText, userAgeText, euserFullName_1, euserFullName_2, euserFullName_3, euserPhoneno_1, euserPhoneno_2, euserPhoneno_3,downloadUrl.toString());
firestore.collection("Users").document(mAuth.getUid()).set(userModel, SetOptions.merge()).addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
Log.d(TAG, "DocumentSnapshot successfully written!" + userModel.toString());
Toast.makeText(getActivity(), "Successfully Saved", Toast.LENGTH_SHORT).show();
// loadHomeFragment();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.w(TAG, "Error writing document", e);
}
});
Toast.makeText(getActivity(), "Upload successful", Toast.LENGTH_SHORT).show();
progressDialog.dismiss();
//showing the uploaded image in ImageView using the download url
//Picasso.with(UploadActivity.this).load(downloadUrl).into(img_user_profile_pic);
}
});
} else {
final UserModel userModel = new UserModel(mAuth.getUid(), userFullNameText, userEmailText, userPhoneNoText, userAgeText, euserFullName_1, euserFullName_2, euserFullName_3, euserPhoneno_1, euserPhoneno_2, euserPhoneno_3);
firestore.collection("Users").document(mAuth.getUid()).set(userModel, SetOptions.merge()).addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
Log.d(TAG, "DocumentSnapshot successfully written!" + userModel.toString());
Toast.makeText(getActivity(), "Successfully Saved", Toast.LENGTH_SHORT).show();
// loadHomeFragment();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.w(TAG, "Error writing document", e);
}
});
}
}
public String GetFileExtension(Uri uri) {
ContentResolver contentResolver = getActivity().getContentResolver();
MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
// Returning the file Extension.
return mimeTypeMap.getExtensionFromMimeType(contentResolver.getType(uri)) ;
}
private void loadHomeFragment() {
Fragment homef = new MapsFragment();
FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
ft.setCustomAnimations(R.anim.fragment_slide_left_enter, R.anim.fragment_slide_left_exit, R.anim.fragment_slide_right_enter, R.anim.fragment_slide_right_exit);
ft.replace(R.id.container, homef);
ft.commit();
}
@OnClick(R.id.img_user_profile_pic)
public void uploadImage(){
if (isReadStorageAllowed()){
// Intent i = new Intent(Intent.ACTION_PICK);
// i.setType("image/*");
// startActivityForResult(i,GALLERY_INTENT);
Intent getIntent = new Intent(Intent.ACTION_GET_CONTENT);
getIntent.setType("image/*");
Intent pickIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
pickIntent.setType("image/*");
Intent chooserIntent = Intent.createChooser(getIntent, "Select image to upload");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[] {pickIntent});
startActivityForResult(chooserIntent,GALLERY_INTENT);
}else {
requestStoragePermission();
}
}
// private void pickImage(){
// Intent getIntent = new Intent(Intent.ACTION_GET_CONTENT);
// getIntent.setType("image/*");
//
// Intent pickIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
// pickIntent.setType("image/*");
//
// Intent chooserIntent = Intent.createChooser(getIntent, "Select image to upload");
// chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[] {pickIntent});
//
// startActivityForResult(chooserIntent, PICK_IMAGE);
// }
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == GALLERY_INTENT && resultCode== RESULT_OK ){
Uri uri = data.getData();
// selectedImage = storageReference.child("profile").child(uri.getd);
selectedImage = uri;
Bitmap bitmap = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(),uri);
img_user_profile_pic.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
}
private boolean isReadStorageAllowed() {
//Getting the permission status
int result = ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE);
//If permission is granted returning true
if (result == PackageManager.PERMISSION_GRANTED)
return true;
//If permission is not granted returning false
return false;
}
private void requestStoragePermission(){
if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),Manifest.permission.READ_EXTERNAL_STORAGE)){
//If the user has denied the permission previously your code will come to this block
//Here you can explain why you need this permission
//Explain here why you need this permission
}
//And finally ask for the permission
ActivityCompat.requestPermissions(getActivity(),new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},STORAGE_PERMISSION_CODE);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
//Checking the request code of our request
if(requestCode == STORAGE_PERMISSION_CODE){
//If permission is granted
if(grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
//Displaying a toast
//Toast.makeText(this,"Permission granted now you can read the storage",Toast.LENGTH_LONG).show();
}else{
//Displaying another toast if permission is not granted
//CustomDialogClass.showAlert(CreateActivity.this,"Oops you just denied the permission\n Allow permission to upload pics");
Toast.makeText(getActivity(), "Allow storage permission to upload image", Toast.LENGTH_SHORT).show();
}
}
}
}
W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
03-25 03:06:50.762 10269-10269/com.lukaut.android W/System.err: at com.lukaut.android.fragments.EditProfileFragment$2.onSuccess(EditProfileFragment.java:132)
03-25 03:06:50.762 10269-10269/com.lukaut.android W/System.err: at com.lukaut.android.fragments.EditProfileFragment$2.onSuccess(EditProfileFragment.java:114)
03-25 03:06:50.762 10269-10269/com.lukaut.android W/System.err: at com.google.android.gms.tasks.zzj.run(Unknown Source)
03-25 03:06:50.762 10269-10269/com.lukaut.android W/System.err: at android.os.Handler.handleCallback(Handler.java:751)
03-25 03:06:50.762 10269-10269/com.lukaut.android W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
03-25 03:06:50.762 10269-10269/com.lukaut.android W/System.err: at android.os.Looper.loop(Looper.java:154)
03-25 03:06:50.762 10269-10269/com.lukaut.android W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6123)
03-25 03:06:50.762 10269-10269/com.lukaut.android W/System.err: at java.lang.reflect.Method.invoke(Native Method)
03-25 03:06:50.762 10269-10269/com.lukaut.android W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
03-25 03:06:50.762 10269-10269/com.lukaut.android W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
1 个答案:
答案 0 :(得分：2)
从堆栈跟踪看起来你的错误就是抛出：
if (!userModel.getUserProfilePic().equals("") ||!userModel.getUserProfilePic().isEmpty()){
在第一个代码片段中。
我猜你的userModel不是从同一代码片段
中的上一行创建的UserModel userModel = documentSnapshot.toObject(UserModel.class);
您可能想要调查为什么会发生这种情况，但与此同时，您可以通过添加空指针检查来防止崩溃：
if ( userModel != null && (!userModel.getUserProfilePic().equals("") ||!userModel.getUserProfilePic().isEmpty())) {
额外的“userModel！= null”将确保usermodel不为null，使用“＆amp;＆amp;”然后，如果它为null，则会阻止评估以下条件。
这有时被称为“快捷布尔评估”。一旦知道布尔表达式的结果，执行程序（在这种情况下为Java虚拟机）将不会打扰评估表达式的任何其他部分。
因为任何带有false的“anded”只能是false（userModel！= null，当userModel为null时将返回false），将不会执行附加检查（!userModel.getUserProfilePic().equals("") ||!userModel.getUserProfilePic().isEmpty()），因此不会出现空指针异常。 / p>
对于长时间的解释感到抱歉，但是一些新的程序员可能会觉得它很有趣。
希望这会有所帮助。 CJ
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