构建电影应用程序时，错误的原因是，当另一个以相同的方式实现时，此回收视图无法显示任何内容。
有一个错误就是无法找到它.Been很长时间看着屏幕。在此先感谢!!
XML：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPrimaryDark"
tools:context="com.example.mrmohammad.movies4u.DetailActivity"
>
<LinearLayout
android:id="@+id/ad"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="10dp">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:showIn="@layout/activity_detail">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<TextView
android:id="@+id/tv_title_movie"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="@dimen/tv_title_movie_margin_top_content_detail"
android:background="@drawable/bg_rating"
android:padding="@dimen/tv_title_movie_padding_content_detail"
android:text="Harry Potter"
android:textColor="#fff"
android:textSize="21sp"
android:textStyle="bold"
app:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_creator="1"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/tv_release_year"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="@dimen/tv_release_year_content_detail_rating"
android:background="@drawable/bg_rating"
android:padding="@dimen/tv_title_movie_padding_content_detail"
android:text="2018"
android:textColor="#fff"
android:textSize="16sp"
app:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_creator="1"
app:layout_constraintTop_toBottomOf="@id/tv_title_movie" />
<TextView
android:id="@+id/tv_rating"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="@dimen/tv_release_year_content_detail_rating"
android:background="@drawable/bg_rating"
android:drawableLeft="@drawable/ic_star_black_24dp"
android:padding="@dimen/tv_title_movie_padding_content_detail"
android:paddingRight="5dp"
android:text="8.9"
android:textColor="#fff"
android:textSize="16sp"
android:textStyle="bold"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@id/tv_release_year" />
<RelativeLayout
android:id="@+id/llsynopsisbtn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="@dimen/tv_release_year_content_detail_rating"
android:orientation="horizontal"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@id/tv_rating">
<TextView
android:id="@+id/tv_synopsis_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/bg_rating"
android:padding="@dimen/tv_title_movie_padding_content_detail"
android:text="@string/synopsis"
android:textColor="#fff"
android:textSize="18sp" />
<View
android:id="@+id/emptyView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_toRightOf="@id/tv_synopsis_label"
android:layout_weight="1" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:gravity="end"
android:orientation="horizontal">
<ImageView
android:id="@+id/share"
android:layout_width="35dp"
android:layout_height="35dp"
android:contentDescription="Share..."
android:padding="4dp"
android:src="@drawable/ic_share_black_24dp" />
<ImageView
android:id="@+id/saveFav"
android:layout_width="35dp"
android:layout_height="35dp"
android:layout_below="@id/share"
android:contentDescription="Save in Favorites"
android:padding="4dp"
android:src="@drawable/thumbsup" />
<ImageView
android:id="@+id/deleteFav"
android:layout_width="35dp"
android:layout_height="35dp"
android:layout_toRightOf="@id/saveFav"
android:contentDescription="Delete from Favorites"
android:padding="4dp"
android:src="@drawable/delete" />
</LinearLayout>
</RelativeLayout>
<TextView
android:id="@+id/tv_synopsis"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/synopsis_margin_left"
android:layout_marginRight="@dimen/synopsis_margin_right"
android:layout_marginTop="@dimen/synopsis_margin_top"
android:text="Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitationlaboris nisi ut aliquip ex ea commodo consequat."
android:textColor="#fff"
android:textSize="15sp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@id/llsynopsisbtn" />
<TextView
android:id="@+id/thumbnailURL"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="invisible" />
<LinearLayout
android:id="@+id/linLayContentDetail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="4dp"
android:orientation="vertical"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@id/tv_synopsis">
<TextView
android:id="@+id/trailer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:background="@drawable/bg_rating"
android:padding="8dp"
android:text="Trailers"
android:textColor="#fff"
android:textSize="20sp"
/>
<android.support.v7.widget.RecyclerView
android:id="@+id/rvTrailers"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="3dp"
android:clipToPadding="false"
android:padding="12dp"
android:paddingBottom="25dp"
android:scrollbars="vertical"
>
</android.support.v7.widget.RecyclerView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="4dp"
android:orientation="vertical"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@id/linLayContentDetail">
<TextView
android:id="@+id/review"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:background="@drawable/bg_rating"
android:padding="8dp"
android:text="Reviews"
android:textColor="#fff"
android:textSize="20sp"
/>
<android.support.v7.widget.RecyclerView
android:id="@+id/rvReview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="3dp"
android:clipToPadding="false"
android:padding="12dp"
android:paddingBottom="25dp"
>
<!--HERE IS TEH RECYCLERVIEW THAT DONT DISPLAY-->
</android.support.v7.widget.RecyclerView>
</LinearLayout>
</android.support.constraint.ConstraintLayout>
</ScrollView>
</LinearLayout>
</RelativeLayout>
DetailActivity：
public class DetailActivity extends AppCompatActivity {
TextView movieName, releaseDate, userRating, synopsis;
int id;
ImageView iv, share, saveFav, deletFav;
private RecyclerView rvDetail, rvReview;
private TrailerAdapter adapter;
private ReviewAdapter reviewAdapter;
private List<Trailer> trailerList;
private List<Review> reviewList;
public static final String BASE_URL =
"https://image.tmdb.org/t/p/w500";
public static final String TAG = DetailActivity.class.getSimpleName();
public MovieDbHelper dbHelper;
private Movie favoriteMovie;
private AppCompatActivity activity = DetailActivity.this;
String poster, overview, rating, movieTitle, release;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
Stetho.initializeWithDefaults(this);
share = findViewById(R.id.share);
saveFav = findViewById(R.id.saveFav);
deletFav = findViewById(R.id.deleteFav);
final int movie_id = getIntent().getExtras().getInt("id");
if (checkFavoriteMovie(movie_id)) {
//Is a favorite
saveFav.setVisibility(View.GONE);
saveFav.setEnabled(false);
deletFav.setEnabled(true);
deletFav.setVisibility(View.VISIBLE);
} else {
deletFav.setVisibility(View.GONE);
deletFav.setEnabled(false);
saveFav.setEnabled(true);
saveFav.setVisibility(View.VISIBLE);
}
iv = findViewById(R.id.iv_detail);
movieName = findViewById(R.id.tv_title_movie);
releaseDate = findViewById(R.id.tv_release_year);
userRating = findViewById(R.id.tv_rating);
synopsis = findViewById(R.id.tv_synopsis);
Intent intentFromAdapter = getIntent();
if (intentFromAdapter.hasExtra("original_title")) {
poster =
intentFromAdapter.getExtras().getString("poster_path");
movieTitle =
intentFromAdapter.getExtras().getString("original_title");
overview = intentFromAdapter.getExtras().getString("overview");
rating =
intentFromAdapter.getExtras().getString("vote_average");
release =
intentFromAdapter.getExtras().getString("release_date");
Picasso.with(this).load(BASE_URL + poster).into(iv);
movieName.setText(movieTitle);
releaseDate.setText(release);
userRating.setText(rating);
synopsis.setText(overview);
} else {
Toast.makeText(this, "No Data...", Toast.LENGTH_SHORT).show();
}
SharedPreferences sharedPreferences =
PreferenceManager.getDefaultSharedPreferences(this);
saveFav.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (checkFavoriteMovie(movie_id)) {
Toast.makeText(activity, "Already added!",
Toast.LENGTH_SHORT).show();
} else {
SharedPreferences.Editor editor =
getSharedPreferences("com.example.mrmohammad.movies4u.DetailActivity", MODE_PRIVATE).edit();
editor.putBoolean("Favorite Added", true);
editor.commit();
addFavorites();
Toast.makeText(DetailActivity.this, "Movie Added successfully...", Toast.LENGTH_SHORT).show();
}
//
saveFav.setEnabled(false);
deletFav.setEnabled(true);
deletFav.setVisibility(View.VISIBLE);
saveFav.setVisibility(View.GONE);
//
}
});
deletFav.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences.Editor editor = getSharedPreferences("com.example.mrmohammad.movies4u.DetailActivity", MODE_PRIVATE).edit();
editor.putBoolean("Favorite Removed", true);
editor.commit();
removeFromFavorites(movie_id);
Toast.makeText(DetailActivity.this, "Movie Removed...", Toast.LENGTH_SHORT).show();
//
deletFav.setEnabled(false);
saveFav.setEnabled(true);
deletFav.setVisibility(View.GONE);
saveFav.setVisibility(View.VISIBLE);
//
}
});
share.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String d = movieName.getText().toString().trim();
String s = "http://www.youtube.com/watch?v=" + d;
s = s.replaceAll(" ", "%20");
String full = "CLICK LINK " + s;
Intent shareIntent = ShareCompat.IntentBuilder.from(DetailActivity.this)
.setType("text/plain")
.setText(full)
.getIntent();
startActivity(shareIntent);
}
});
initializeViews();
}
private void initializeViews() {
/////// Trailers
trailerList = new ArrayList<>();
adapter = new TrailerAdapter(this, trailerList);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
rvDetail = findViewById(R.id.rvTrailers);
rvDetail.setLayoutManager(layoutManager);
rvDetail.setAdapter(adapter);
adapter.notifyDataSetChanged();
////////// Reviews
reviewList = new ArrayList<>();
reviewAdapter = new ReviewAdapter(this, reviewList);
RecyclerView.LayoutManager lm = new LinearLayoutManager(getApplicationContext());
rvReview = findViewById(R.id.rvReview);
rvReview.setLayoutManager(lm);
rvReview.setAdapter(reviewAdapter);
reviewAdapter.notifyDataSetChanged();
loadJSONTrailers();
loadJSONReview();
}
private void loadJSONTrailers() {
int movie_id = getIntent().getExtras().getInt("id");
try {
if (BuildConfig.THE_MOVIE_DB_API_TOKEN.isEmpty()) {
Toast.makeText(this, "Please obtain API KEY", Toast.LENGTH_SHORT).show();
return;
}
Client Client = new Client();
Service apiService = Client.getClient().create(Service.class);
Call<TrailerResponse> call = apiService.getMovieTrailer(movie_id, BuildConfig.THE_MOVIE_DB_API_TOKEN);
call.enqueue(new Callback<TrailerResponse>() {
@Override
public void onResponse(Call<TrailerResponse> call, Response<TrailerResponse> response) {
List<Trailer> trailers = response.body().getResuts();
rvDetail.setAdapter(new TrailerAdapter(getApplicationContext(), trailers));
rvDetail.smoothScrollToPosition(0);
}
@Override
public void onFailure(Call<TrailerResponse> call, Throwable t) {
Log.d("Error", t.getMessage());
Toast.makeText(DetailActivity.this, "Error fetching Trailer", Toast.LENGTH_SHORT).show();
}
});
} catch (Exception e) {
Log.d("Error", e.getMessage());
Toast.makeText(this, e.toString(), Toast.LENGTH_SHORT).show();
}
}
private void loadJSONReview() {
int movie_id = getIntent().getExtras().getInt("id");
try {
if (BuildConfig.THE_MOVIE_DB_API_TOKEN.isEmpty()) {
Toast.makeText(this, "Please obtain API KEY", Toast.LENGTH_SHORT).show();
return;
}
Client Client = new Client();
Service apiService = Client.getClient().create(Service.class);
Call<ReviewResponse> call = apiService.getMovieReviews(movie_id, BuildConfig.THE_MOVIE_DB_API_TOKEN);
call.enqueue(new Callback<ReviewResponse>() {
@Override
public void onResponse(Call<ReviewResponse> call, Response<ReviewResponse> response) {
List<Review> reviews = response.body().getResults();
rvReview.setAdapter(new ReviewAdapter(getApplicationContext(), reviews));
rvReview.smoothScrollToPosition(0);
Log.d(TAG, "Here>>>>>>>>>>>>>>>>");
}
@Override
public void onFailure(Call<ReviewResponse> call, Throwable t) {
Log.d("Error", t.getMessage());
Toast.makeText(DetailActivity.this, "Error fetching Review", Toast.LENGTH_SHORT).show();
}
});
} catch (Exception e) {
Log.d("Error", e.getMessage());
Toast.makeText(this, e.toString(), Toast.LENGTH_SHORT).show();
}
}
public void addFavorites() {
int movie_id = getIntent().getExtras().getInt("id");
dbHelper = new MovieDbHelper(activity);
favoriteMovie = new Movie();
String rate = getIntent().getExtras().getString("vote_average");
String poster = getIntent().getExtras().getString("poster_path");
favoriteMovie.setId(movie_id);
favoriteMovie.setOriginalTitle(movieName.getText().toString().trim());
favoriteMovie.setPosterPath(poster);
favoriteMovie.setVoteAverage(Double.parseDouble(rate));
favoriteMovie.setOverview(synopsis.getText().toString().trim());
favoriteMovie.setReleaseDate(releaseDate.getText().toString().trim());
dbHelper.addFavorites(favoriteMovie);
Log.d(TAG, "Added fav.....");
}
private void removeFromFavorites(int id) {
getApplicationContext().getContentResolver().delete(MovieContract.MovieEntry.CONTENT_URI, MovieContract.MovieEntry.COLUMN_MOVIE_ID + " = ?",
new String[]{String.valueOf(id)});
}
private boolean checkFavoriteMovie(int id) {
Cursor cursor = activity.getContentResolver().query(MovieContract.MovieEntry.CONTENT_URI, null, MovieContract.MovieEntry.COLUMN_MOVIE_ID + " = " + id, null, null);
assert cursor != null;
if (cursor.getCount() <= 0) {
cursor.close();
return false;
}
cursor.close();
return true;
}
}
ReviewAdapter
public class ReviewAdapter extends
RecyclerView.Adapter<ReviewAdapter.MyViewHolder>{
private Context mContext;
private List<Review> reviewsList;
public ReviewAdapter(Context mContext, List<Review> reviewsList){
this.mContext = mContext;
this.reviewsList = reviewsList;
}
@Override
public ReviewAdapter.MyViewHolder onCreateViewHolder(ViewGroup viewGroup, int i){
View view = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.review, viewGroup, false);
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(final ReviewAdapter.MyViewHolder holder, int i){
holder.reviewAuthor.setText(reviewsList.get(i).getAuthor());
holder.reviewContent.setText(reviewsList.get(i).getContent());
}
@Override
public int getItemCount(){
return reviewsList.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder{
TextView reviewAuthor;
TextView reviewContent;
public MyViewHolder(View view){
super(view);
reviewAuthor = view.findViewById(R.id.review_author);
reviewContent = view.findViewById(R.id.review_content);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int pos = getAdapterPosition();
if(pos != RecyclerView.NO_POSITION){
String author = reviewsList.get(pos).getAuthor();
String content = reviewsList.get(pos).getContent();
reviewAuthor.setText(author);
reviewContent.setText(content);
}
}
});
}
}
}
任何建议都非常赞赏我的问题是recyclerview没有显示数据，但它确实显示了JSON中的端点。我可以链接我的github，但你需要得到another API KEY from here。
我的github链接是here
非常感谢。
答案 0 :(得分：1)
在 scrollview 或类似于scrollview的任何视图中放置 listView 或任何类似于listView的视图并不是一个好主意。
结果可能是只显示列表中的第一个元素。其余的将叠加在第一项之后。
答案 1 :(得分：1)
您的RecyclerView身高可能被评估为＆＃34;零＆＃34;。
为了对此进行调试，您可以将固定android:layout_height设置为更大的固定值。