java - com.google.firebase.database.DatabaseException : Can't convert object of type java. lang.String 键入 com.example.bottary.Movie

Question

我尝试在 recyclerview 中显示图像和 TextView ，但找不到问题，我将照片和文本放在 firebase 中的“”中，有什么问题吗？

Java

    MoviesRv.setLayoutManager(new LinearLayoutManager(HomeActivity.this, LinearLayout.HORIZONTAL,false));
    reference = FirebaseDatabase.getInstance().getReference("Data");
    reference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            List<Movie> first_tMovie = new ArrayList<>();
            for(DataSnapshot dataSnapshot1: dataSnapshot.getChildren())
            {
                Movie p = dataSnapshot1.getValue(Movie.class);
                first_tMovie.add(p);
            }
            MovieAdapter movieAdapter = new MovieAdapter(HomeActivity.this,first_tMovie);
            MoviesRv.setAdapter(movieAdapter)

有模型类

Java

public class Movie {
private String title;
private String description;
private int thumbnail;
private String studio;
private String Rating;
private String streaminglink;

public Movie(String title , int thumbnail) {
    this.title = title;
    this.thumbnail = thumbnail;

}

public Movie(String title, int thumbnail) {
    this.title = title;
    this.thumbnail = thumbnail;
}

public String getTitle() {
    return title;
}



public int getThumbnail() {
    return thumbnail;
}

Answer 1

这是因为你无法将 Movie.class 的参数传递到 value 参数中:

改为更改此:

  Movie p = dataSnapshot1.getValue(Movie.class);

对此:

Movie p = (Movie)dataSnapshot1.getValue();

或者正确传递参数，即

Movie p = new Movie(datasnapshot1.child("x").getValue(),datasnapshot1.child("thumbnail").getValue());