没有从 IGDB 接收到 Cover 的数据
Not receiving the data for Cover from IGDB
我在使用改造从 IGDB API 获取数据方面苦苦挣扎了几个星期。我正在尝试获取游戏封面的 URL 并想使用片段将其显示在 GridLayout 中。
但是我得到了 "attempt to invoke virtual method on a null object reference"。有人可以看看我的代码，看看我错过了什么吗？提前致谢！
Game.java:
import java.util.List;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Game {
@SerializedName("id")
@Expose
private Integer id;
@SerializedName("cover")
@Expose
private Cover cover;
@SerializedName("name")
@Expose
private String name;
@SerializedName("popularity")
@Expose
private Double popularity;
@SerializedName("summary")
@Expose
private String summary;
@SerializedName("genres")
@Expose
private List<Genre> genres = null;
@SerializedName("platforms")
@Expose
private List<Platform> platforms = null;
@SerializedName("rating")
@Expose
private Double rating;
@SerializedName("release_dates")
@Expose
private List<ReleaseDate> releaseDates = null;
@SerializedName("videos")
@Expose
private List<Video> videos = null;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Cover getCover() {
return cover;
}
public void setCover(Cover cover) {
this.cover = cover;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getPopularity() {
return popularity;
}
public void setPopularity(Double popularity) {
this.popularity = popularity;
}
public String getSummary() {
return summary;
}
public void setSummary(String summary) {
this.summary = summary;
}
public List<Genre> getGenres() {
return genres;
}
public void setGenres(List<Genre> genres) {
this.genres = genres;
}
public List<Platform> getPlatforms() {
return platforms;
}
public void setPlatforms(List<Platform> platforms) {
this.platforms = platforms;
}
public Double getRating() {
return rating;
}
public void setRating(Double rating) {
this.rating = rating;
}
public List<ReleaseDate> getReleaseDates() {
return releaseDates;
}
public void setReleaseDates(List<ReleaseDate> releaseDates) {
this.releaseDates = releaseDates;
}
public List<Video> getVideos() {
return videos;
}
public void setVideos(List<Video> videos) {
this.videos = videos;
}
}
Cover.java:
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Cover {
@SerializedName("id")
@Expose
private Integer id;
@SerializedName("url")
@Expose
private String url;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
GameAdapter.java
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.riceplant.capstoneproject.R;
import com.riceplant.capstoneproject.data.Game;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
public class GameAdapter extends RecyclerView.Adapter<GameAdapter.GameAdapterViewHolder> {
private ArrayList<Game> mGameData;
private Context mContext;
public GameAdapter(Context context, ArrayList<Game> gameData) {
mContext = context;
mGameData = gameData;
}
public class GameAdapterViewHolder extends RecyclerView.ViewHolder {
ImageView mGameCover;
public GameAdapterViewHolder(@NonNull View itemView) {
super(itemView);
mGameCover = itemView.findViewById(R.id.game_cover_image);
}
}
@NonNull
@Override
public GameAdapterViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
Context context = parent.getContext();
int layoutIdForListItem = R.layout.game_list_item;
LayoutInflater layoutInflater = LayoutInflater.from(context);
View view = layoutInflater.inflate(layoutIdForListItem, parent, false);
return new GameAdapterViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull GameAdapterViewHolder holder, int position) {
String currentGame = mGameData.get(position).getCover().getUrl();
Picasso.get()
.load(currentGame)
.placeholder(R.drawable.image_loading)
.error(R.drawable.image_not_found)
.into(holder.mGameCover);
}
@Override
public int getItemCount() {
if (mGameData == null) {
return 0;
}
return mGameData.size();
}
}
PopularGamesFragment.java
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.riceplant.capstoneproject.R;
import com.riceplant.capstoneproject.adapter.GameAdapter;
import com.riceplant.capstoneproject.data.Game;
import com.riceplant.capstoneproject.network.GameInstance;
import com.riceplant.capstoneproject.network.GetDataService;
import java.util.ArrayList;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class PopularGamesFragment extends Fragment {
private RecyclerView mRecyclerView;
private TextView mErrorTextMessage;
private GameAdapter mGameAdapter;
public static final String FIELDS = "fields name, platforms.name, cover.url, rating, release_dates.human, genres.name, summary, popularity, time_to_beat, videos.name, videos.video_id;";
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_popular_games, container, false);
GetDataService service = GameInstance.getGameInstance().create(GetDataService.class);
Call<ArrayList<Game>> call = service.getAllGames(FIELDS);
call.enqueue(new Callback<ArrayList<Game>>() {
@Override
public void onResponse(Call<ArrayList<Game>> call, Response<ArrayList<Game>> response) {
mRecyclerView = view.findViewById(R.id.recycler_view);
generateDataList(response.body());
}
@Override
public void onFailure(Call<ArrayList<Game>> call, Throwable t) {
mErrorTextMessage = view.findViewById(R.id.popular_games_error_message);
mErrorTextMessage.setText("Something went wrong. Try again!");
}
});
return view;
}
private void generateDataList(ArrayList<Game> gameList) {
mGameAdapter = new GameAdapter(getActivity(), gameList);
GridLayoutManager gridLayoutManager = new GridLayoutManager(getActivity(), 2);
mRecyclerView.setLayoutManager(gridLayoutManager);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setAdapter(mGameAdapter);
}
}
GameInstance.java
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
public class GameInstance {
private static Retrofit retrofit;
public static final String BASE_URL = "https://api-v3.igdb.com/";
public static Retrofit getGameInstance() {
if (retrofit == null) {
retrofit = new retrofit2.Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
}
获取数据服务
import com.riceplant.capstoneproject.data.Game;
import java.util.ArrayList;
import retrofit2.Call;
import retrofit2.http.Body;
import retrofit2.http.Headers;
import retrofit2.http.POST;
public interface GetDataService {
@Headers("user-key: 0d22adeb6cf3650dbefe7f8214537075")
@POST("games")
Call<ArrayList<Game>> getAllGames(@Body String fields);
}
堆栈跟踪：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.riceplant.capstoneproject, PID: 9882
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.riceplant.capstoneproject.data.Cover.getUrl()' on a null object reference
at com.riceplant.capstoneproject.adapter.GameAdapter.onBindViewHolder(GameAdapter.java:51)
at com.riceplant.capstoneproject.adapter.GameAdapter.onBindViewHolder(GameAdapter.java:19)
at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7065)
at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7107)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6012)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6279)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114)
at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2303)
at androidx.recyclerview.widget.GridLayoutManager.layoutChunk(GridLayoutManager.java:561)
at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587)
at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665)
at androidx.recyclerview.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:170)
at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
at androidx.recyclerview.widget.RecyclerView.onMeasure(RecyclerView.java:3540)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
at android.view.View.measure(View.java:24530)
at androidx.viewpager.widget.ViewPager.onMeasure(ViewPager.java:1638)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:742)
at android.view.View.measure(View.java:24530)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:3006)
E/AndroidRuntime: at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1833)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2122)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1721)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7598)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:966)
at android.view.Choreographer.doCallbacks(Choreographer.java:790)
at android.view.Choreographer.doFrame(Choreographer.java:725)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:951)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
I/Process: Sending signal. PID: 9882 SIG: 9
您的 API 调用是正确的。但是响应数组中的对象很少没有所有必需的字段或对象。
例如：
响应中的以下对象没有类型和封面。
{
"id": 91579,
"name": "Racing Live",
"popularity"：1.0
}
在这种情况下，您的代码将抛出 NullPointerException。
要解决此问题，请更新 GameAdapter 中的 onBindViewHolder 方法的代码 class。
@Override
public void onBindViewHolder(@NonNull GameAdapterViewHolder holder, int position) {
Cover cover = mGameData.get(position).getCover()
String currentGame = null
if(cover!=null)
currentGame = cover.getUrl();
Picasso.get()
.load(currentGame)
.placeholder(R.drawable.image_loading)
.error(R.drawable.image_not_found)
.into(holder.mGameCover);
}
我在使用改造从 IGDB API 获取数据方面苦苦挣扎了几个星期。我正在尝试获取游戏封面的 URL 并想使用片段将其显示在 GridLayout 中。 但是我得到了 "attempt to invoke virtual method on a null object reference"。有人可以看看我的代码，看看我错过了什么吗？提前致谢！
Game.java:
import java.util.List;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Game {
@SerializedName("id")
@Expose
private Integer id;
@SerializedName("cover")
@Expose
private Cover cover;
@SerializedName("name")
@Expose
private String name;
@SerializedName("popularity")
@Expose
private Double popularity;
@SerializedName("summary")
@Expose
private String summary;
@SerializedName("genres")
@Expose
private List<Genre> genres = null;
@SerializedName("platforms")
@Expose
private List<Platform> platforms = null;
@SerializedName("rating")
@Expose
private Double rating;
@SerializedName("release_dates")
@Expose
private List<ReleaseDate> releaseDates = null;
@SerializedName("videos")
@Expose
private List<Video> videos = null;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Cover getCover() {
return cover;
}
public void setCover(Cover cover) {
this.cover = cover;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getPopularity() {
return popularity;
}
public void setPopularity(Double popularity) {
this.popularity = popularity;
}
public String getSummary() {
return summary;
}
public void setSummary(String summary) {
this.summary = summary;
}
public List<Genre> getGenres() {
return genres;
}
public void setGenres(List<Genre> genres) {
this.genres = genres;
}
public List<Platform> getPlatforms() {
return platforms;
}
public void setPlatforms(List<Platform> platforms) {
this.platforms = platforms;
}
public Double getRating() {
return rating;
}
public void setRating(Double rating) {
this.rating = rating;
}
public List<ReleaseDate> getReleaseDates() {
return releaseDates;
}
public void setReleaseDates(List<ReleaseDate> releaseDates) {
this.releaseDates = releaseDates;
}
public List<Video> getVideos() {
return videos;
}
public void setVideos(List<Video> videos) {
this.videos = videos;
}
}
Cover.java:
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Cover {
@SerializedName("id")
@Expose
private Integer id;
@SerializedName("url")
@Expose
private String url;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
GameAdapter.java
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.riceplant.capstoneproject.R;
import com.riceplant.capstoneproject.data.Game;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
public class GameAdapter extends RecyclerView.Adapter<GameAdapter.GameAdapterViewHolder> {
private ArrayList<Game> mGameData;
private Context mContext;
public GameAdapter(Context context, ArrayList<Game> gameData) {
mContext = context;
mGameData = gameData;
}
public class GameAdapterViewHolder extends RecyclerView.ViewHolder {
ImageView mGameCover;
public GameAdapterViewHolder(@NonNull View itemView) {
super(itemView);
mGameCover = itemView.findViewById(R.id.game_cover_image);
}
}
@NonNull
@Override
public GameAdapterViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
Context context = parent.getContext();
int layoutIdForListItem = R.layout.game_list_item;
LayoutInflater layoutInflater = LayoutInflater.from(context);
View view = layoutInflater.inflate(layoutIdForListItem, parent, false);
return new GameAdapterViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull GameAdapterViewHolder holder, int position) {
String currentGame = mGameData.get(position).getCover().getUrl();
Picasso.get()
.load(currentGame)
.placeholder(R.drawable.image_loading)
.error(R.drawable.image_not_found)
.into(holder.mGameCover);
}
@Override
public int getItemCount() {
if (mGameData == null) {
return 0;
}
return mGameData.size();
}
}
PopularGamesFragment.java
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.riceplant.capstoneproject.R;
import com.riceplant.capstoneproject.adapter.GameAdapter;
import com.riceplant.capstoneproject.data.Game;
import com.riceplant.capstoneproject.network.GameInstance;
import com.riceplant.capstoneproject.network.GetDataService;
import java.util.ArrayList;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class PopularGamesFragment extends Fragment {
private RecyclerView mRecyclerView;
private TextView mErrorTextMessage;
private GameAdapter mGameAdapter;
public static final String FIELDS = "fields name, platforms.name, cover.url, rating, release_dates.human, genres.name, summary, popularity, time_to_beat, videos.name, videos.video_id;";
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_popular_games, container, false);
GetDataService service = GameInstance.getGameInstance().create(GetDataService.class);
Call<ArrayList<Game>> call = service.getAllGames(FIELDS);
call.enqueue(new Callback<ArrayList<Game>>() {
@Override
public void onResponse(Call<ArrayList<Game>> call, Response<ArrayList<Game>> response) {
mRecyclerView = view.findViewById(R.id.recycler_view);
generateDataList(response.body());
}
@Override
public void onFailure(Call<ArrayList<Game>> call, Throwable t) {
mErrorTextMessage = view.findViewById(R.id.popular_games_error_message);
mErrorTextMessage.setText("Something went wrong. Try again!");
}
});
return view;
}
private void generateDataList(ArrayList<Game> gameList) {
mGameAdapter = new GameAdapter(getActivity(), gameList);
GridLayoutManager gridLayoutManager = new GridLayoutManager(getActivity(), 2);
mRecyclerView.setLayoutManager(gridLayoutManager);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setAdapter(mGameAdapter);
}
}
GameInstance.java
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
public class GameInstance {
private static Retrofit retrofit;
public static final String BASE_URL = "https://api-v3.igdb.com/";
public static Retrofit getGameInstance() {
if (retrofit == null) {
retrofit = new retrofit2.Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
}
获取数据服务
import com.riceplant.capstoneproject.data.Game;
import java.util.ArrayList;
import retrofit2.Call;
import retrofit2.http.Body;
import retrofit2.http.Headers;
import retrofit2.http.POST;
public interface GetDataService {
@Headers("user-key: 0d22adeb6cf3650dbefe7f8214537075")
@POST("games")
Call<ArrayList<Game>> getAllGames(@Body String fields);
}
堆栈跟踪：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.riceplant.capstoneproject, PID: 9882
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.riceplant.capstoneproject.data.Cover.getUrl()' on a null object reference
at com.riceplant.capstoneproject.adapter.GameAdapter.onBindViewHolder(GameAdapter.java:51)
at com.riceplant.capstoneproject.adapter.GameAdapter.onBindViewHolder(GameAdapter.java:19)
at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7065)
at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7107)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6012)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6279)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114)
at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2303)
at androidx.recyclerview.widget.GridLayoutManager.layoutChunk(GridLayoutManager.java:561)
at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587)
at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665)
at androidx.recyclerview.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:170)
at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
at androidx.recyclerview.widget.RecyclerView.onMeasure(RecyclerView.java:3540)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
at android.view.View.measure(View.java:24530)
at androidx.viewpager.widget.ViewPager.onMeasure(ViewPager.java:1638)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
at android.view.View.measure(View.java:24530)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:742)
at android.view.View.measure(View.java:24530)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:3006)
E/AndroidRuntime: at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1833)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2122)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1721)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7598)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:966)
at android.view.Choreographer.doCallbacks(Choreographer.java:790)
at android.view.Choreographer.doFrame(Choreographer.java:725)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:951)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
I/Process: Sending signal. PID: 9882 SIG: 9
您的 API 调用是正确的。但是响应数组中的对象很少没有所有必需的字段或对象。
例如： 响应中的以下对象没有类型和封面。 { "id": 91579, "name": "Racing Live", "popularity"：1.0 }
在这种情况下，您的代码将抛出 NullPointerException。
要解决此问题，请更新 GameAdapter 中的 onBindViewHolder 方法的代码 class。
@Override
public void onBindViewHolder(@NonNull GameAdapterViewHolder holder, int position) {
Cover cover = mGameData.get(position).getCover()
String currentGame = null
if(cover!=null)
currentGame = cover.getUrl();
Picasso.get()
.load(currentGame)
.placeholder(R.drawable.image_loading)
.error(R.drawable.image_not_found)
.into(holder.mGameCover);
}