Question

这是我的代码。我正在编写一个应用程序并使用firebase加载随机用户照片，但是在我对这个片段进行了多次操作之后，它会因内存泄漏而崩溃。我一直在寻找它。请帮助：）

我的应用如何运作：

创建用户
用户拍照
随机的其他用户（或相同的用户）照片上传
用户评价图片然后出现新照片

公共类RatingFragment扩展Fragment {

private TabLayout tabLayout;
private ImageView imageView;
private DatabaseReference databaseReference;
private FirebaseDatabase firebaseDatabase;
private DataSnapshot childSnapshot;
private User user, newUser;
private RatingBar ratingBar;
private Random random = new Random(System.currentTimeMillis());

public RatingFragment() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    final View view;
    view = inflater.inflate(R.layout.fragment_rating, container, false);

    tabLayout = view.findViewById(R.id.tabLayoutRating);
    tabLayout.setTabTextColors(ColorStateList.valueOf(Color.WHITE));
    tabLayout.setSelectedTabIndicatorColor(Color.WHITE);

    firebaseDatabase = FirebaseDatabase.getInstance();
    databaseReference = firebaseDatabase.getReference().child("users");

    imageView = view.findViewById(R.id.ivRandomPhoto);

    databaseReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            int userCount = (int) dataSnapshot.getChildrenCount();
            int rand = random.nextInt(userCount);
            Iterator itr = dataSnapshot.getChildren().iterator();

            for (int i = 0; i < rand; i++) {
                itr.next();
            }
            childSnapshot = (DataSnapshot) itr.next();
            user = childSnapshot.getValue(User.class);
            imageView.setImageURI(Uri.parse(user.getNewPhoto()));
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

    ratingBar = view.findViewById(R.id.ratingBar);

    ratingBar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() {
        @Override
        public void onRatingChanged(RatingBar ratingBar, float v, boolean b) {
            newUser = new User (user.getUserId(),user.getUsername(),user.getPhotos(),user.getAverageRating(),user.getPoints()+1,user.getNewPhoto());
            databaseReference.child(user.getUserId()).setValue(newUser);
            ratingBar.setRating(0);
        }
    });

    TabLayout.Tab tab = tabLayout.getTabAt(1);
    tab.select();

    tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            switch (tab.getPosition()) {
                case 0:
                    CropFragment cropFragment = new CropFragment();
                    FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
                    fragmentTransaction.replace(R.id.main_framelayout, cropFragment);
                    fragmentTransaction.commit();
                    break;
            }
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }
    });

    return view;
   }
 }

Answer 1

您正在onCreateView中添加ValueEventListener，但据我所知，您无法随时删除它。除此之外，我还没有看到任何其他内存泄漏源。

我有内存泄漏但找不到它

1 个答案: