我正在学习 RxJava (Observable) 和 Retrofit2。我遇到了 Picasso 没有从 URL 加载图像的情况。详情如下:
public class IntentKeys {
public static final long INTERCEPTOR_TIMEOUT = 15;
public static final String POPULAR_MOVIES_SERVICE_ENDPOINT = "http://api.themoviedb.org/3/";
public static final String POPULAR_MOVIES_POSTER_ENDPOINT = "http://image.tmdb.org/t/p/w300/";
public static final String POPULAR_MOVIES_API_KEY = "key";
}
Recyclerview 适配器:
public class GridViewAdapter extends RecyclerView.Adapter<GridViewAdapter.GridVieHolder> {
private static final String TAG = GridViewAdapter.class.getSimpleName();
private static final int SPAN_COUNT = 2;
private static final float THUMBNAIL_RATIO = 1.5f;
private List<Result> movies = new ArrayList<>();
private Context context;
public GridViewAdapter(List<Result> movies, Context context) {
this.movies = movies;
this.context = context;
}
@Override
public GridVieHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.movies_grid_view, parent, false);
// view.getLayoutParams().height = (int) (parent.getWidth() / SPAN_COUNT * THUMBNAIL_RATIO);
return new GridVieHolder(view);
}
@Override
public void onBindViewHolder(GridVieHolder holder, int position) {
GridVieHolder posterHolder = (GridVieHolder) holder;
posterHolder.bind(movies.get(position));
/* Result popularMovies = movies.get(position);
String moviePoster = popularMovies.getPosterPath();
String moviePosterUrl = IntentKeys.POPULAR_MOVIES_POSTER_ENDPOINT + moviePoster;
Picasso.with(context).load(moviePosterUrl.trim())
.config(Bitmap.Config.RGB_565)
.into(posters);*/
}
@Override
public int getItemCount() {
return movies.size();
}
public class GridVieHolder extends RecyclerView.ViewHolder {
ImageView posters;
public GridVieHolder(View itemView) {
super(itemView);
posters = (ImageView) itemView.findViewById(R.id.movies_poster_grid_view);
}
public void bind(final Result result) {
Uri uri = Uri.parse(IntentKeys.POPULAR_MOVIES_POSTER_ENDPOINT).buildUpon()
.appendPath(ImageSize.w185.getValue())
.appendPath(result.getPosterPath().replace("/", ""))
.build();
Picasso.with(itemView.getContext()).load(uri).into(posters);
}
}
}
下面是我定义服务和改造管理器的方式:
public interface PopularMoviesService {
@GET("movie/popular")
Observable<Result> getPopularMovies(@Query("api_key") String apiKey);
}
public class PopularMoviesRetrofitManager {
private PopularMoviesService service;
private static Retrofit retrofit = null;
private static HttpLoggingInterceptor getLoggingInterceptor() {
HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
return interceptor;
}
private static OkHttpClient getOkHttpClient(HttpLoggingInterceptor loggingInterceptor) {
return new OkHttpClient.Builder()
.addInterceptor(loggingInterceptor)
.connectTimeout(IntentKeys.INTERCEPTOR_TIMEOUT, TimeUnit.SECONDS)
.readTimeout(IntentKeys.INTERCEPTOR_TIMEOUT, TimeUnit.SECONDS)
.build();
}
public static Retrofit getMoviesClient() {
OkHttpClient client = getOkHttpClient(getLoggingInterceptor());
if (retrofit == null) {
retrofit = new Retrofit.Builder()
.baseUrl(IntentKeys.POPULAR_MOVIES_SERVICE_ENDPOINT)
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.client(client)
.build();
}
return retrofit;
}
}
最后是适配器和 fragment 类。在 Activity 类中，我有 getSupportFragmentManager() 来加载 fragment 。
public class GridViewAdapter extends RecyclerView.Adapter<GridViewAdapter.GridVieHolder> {
private static final String TAG = GridViewAdapter.class.getSimpleName();
private static final int SPAN_COUNT = 2;
private static final float THUMBNAIL_RATIO = 1.5f;
private List<Result> movies = new ArrayList<>();
private Context context;
public GridViewAdapter(List<Result> movies, Context context) {
this.movies = movies;
this.context = context;
}
@Override
public GridVieHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.movies_grid_view, parent, false);
// view.getLayoutParams().height = (int) (parent.getWidth() / SPAN_COUNT * THUMBNAIL_RATIO);
return new GridVieHolder(view);
}
@Override
public void onBindViewHolder(GridVieHolder holder, int position) {
GridVieHolder posterHolder = (GridVieHolder) holder;
posterHolder.bind(movies.get(position));
/* Result popularMovies = movies.get(position);
String moviePoster = popularMovies.getPosterPath();
String moviePosterUrl = IntentKeys.POPULAR_MOVIES_POSTER_ENDPOINT + moviePoster;
Picasso.with(context).load(moviePosterUrl.trim())
.config(Bitmap.Config.RGB_565)
.into(posters);*/
}
@Override
public int getItemCount() {
return movies.size();
}
public class GridVieHolder extends RecyclerView.ViewHolder {
ImageView posters;
public GridVieHolder(View itemView) {
super(itemView);
posters = (ImageView) itemView.findViewById(R.id.movies_poster_grid_view);
}
public void bind(final Result result) {
Uri uri = Uri.parse(IntentKeys.POPULAR_MOVIES_POSTER_ENDPOINT).buildUpon()
.appendPath(ImageSize.w185.getValue())
.appendPath(result.getPosterPath().replace("/", ""))
.build();
Picasso.with(itemView.getContext()).load(uri).into(posters);
}
}
}
public class PopularMoviesFragment extends Fragment {
private static final String TAG = PopularMoviesFragment.class.getCanonicalName();
private GridViewAdapter gridViewAdapter;
private List<Result> resultItems = new ArrayList<>();;
private Subscription movieSubscription;
private RecyclerView recyclerView;
private PopularMoviesService service
= PopularMoviesRetrofitManager.getMoviesClient().create(PopularMoviesService.class);
public PopularMoviesFragment() {
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_popular_movies, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.popular_movies_recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getContext(), 2);
recyclerView.setLayoutManager(layoutManager);
gridViewAdapter = new GridViewAdapter(resultItems, getContext());
recyclerView.setAdapter(gridViewAdapter);
return (view);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public void onStart() {
super.onStart();
getMoviesSubscription();
}
private void getMoviesSubscription() {
movieSubscription = service.getPopularMovies(IntentKeys.POPULAR_MOVIES_API_KEY)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
new Action1<Result>() {
@Override
public void call(Result popularMovies) {
}
}, new Action1<Throwable>() {
@Override
public void call(Throwable throwable) {
}
}, new Action0() {
@Override
public void call() {
displayPosters();
Log.i(TAG, "getMoviesSubscription: Completed");
}
}
);
}
@Override
public void onDestroyView() {
super.onDestroyView();
if (movieSubscription != null && movieSubscription.isUnsubscribed()) {
movieSubscription.unsubscribe();
}
}
private void displayPosters() {
gridViewAdapter = new GridViewAdapter(resultItems, getContext());
recyclerView.setAdapter(gridViewAdapter);
recyclerView.invalidate();
}
}
问题是，Picasso 没有通过 API 调用将图像加载到 GridView 中。任何人都将不胜感激。
这是 JSON 格式:
{
"page":1,
"results":[
{
"poster_path":"\/5N20rQURev5CNDcMjHVUZhpoCNC.jpg",
"adult":false,
"overview":"Following the events of Age of Ultron, the collective governments of the world pass an act designed to regulate all superhuman activity. This polarizes opinion amongst the Avengers, causing two factions to side with Iron Man or Captain America, which causes an epic battle between former allies.",
"release_date":"2016-04-27",
"genre_ids":[
28,
53,
878
],
"id":271110,
"original_title":"Captain America: Civil War",
"original_language":"en",
"title":"Captain America: Civil War",
"backdrop_path":"\/rqAHkvXldb9tHlnbQDwOzRi0yVD.jpg",
"popularity":49.819238,
"vote_count":2787,
"video":false,
"vote_average":6.93
},
{
"poster_path":"\/e1mjopzAS2KNsvpbpahQ1a6SkSn.jpg",
在这里，poster_path 是我应该从中获取图像的地方。
最后，我有以下控制台输出。我确实看到我收到了响应及其 200。此外，我确实收到了响应中的所有数据。以下是控制台输出。
在此先感谢您为我解决此问题提供的所有支持。
抱歉，我差点忘了布局:movies_grid_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/transparent"
android:orientation="vertical">
<ImageView
android:id="@+id/movies_poster_grid_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
这是日志:
D: ClassLoader referenced unknown path: /data/app/com.example.mchapagai-2/lib/x86_64
W: ClassLoader referenced unknown path: /data/app/com.example.mchapagai-2/lib/x86_64
W: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
D: --> GET http://api.themoviedb.org/3/discover/movie?api_key=api_key http/1.1
D: --> END GET
D: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
[ 09-13 04:50:41.940 9654: 9654 D/ ]
HostConnection::get() New Host Connection established 0x7f16976bf100, tid 9654
D: <-- 200 OK http://api.themoviedb.org/3/discover/movie?api_key=api_key (239ms)
D: Access-Control-Allow-Origin: *
D: Cache-Control: public, max-age=21600
D: Content-Type: application/json;charset=utf-8
D: Date: Tue, 13 Sep 2016 15:17:15 GMT
D: Server: openresty
D: Vary: Accept-Encoding
D: X-RateLimit-Limit: 40
D: X-RateLimit-Remaining: 39
D: X-RateLimit-Reset: 1473779845
D: Connection: keep-alive
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D: ith fearless reporter April and her wise-cracking cameraman Vern Fenwick to save the city and unravel Shredder's diabolical plan.","release_date":"2014-08-07","genre_ids":[878,28,12,14,35],"id":98566,"original_title":"Teenage Mutant Ninja Turtles","original_language":"en","title":"Teenage Mutant Ninja Turtles","backdrop_path":"\/OqCXGt5nl1cHPeotxCDvXLLe6p.jpg","popularity":13.480196,"vote_count":1660,"video":false,"vote_average":5.9}],"total_results":279563,"total_pages":13979}
D: <-- END HTTP (12492-byte body)
I: getMoviesSubscription: Completed
[ 09-13 04:50:42.309 9654: 9699 D/ ]
HostConnection::get() New Host Connection established 0x7f16a00bffc0, tid 9699
I: Initialized EGL, version 1.4
W: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
D: Poster URL: http://image.tmdb.org/t/p/w185/null
D: Dispatcher enqueued [R0]+108ms
D: Hunter executing [R0]+156ms
D: Dispatcher batched [R0]+320ms for error
D: Dispatcher delivered [R0]+560ms
D: Main errored [R0]+560ms
最佳答案
我现在明白了，至少我知道我错过了 onBindViewHolder: http://image.tmdb.org/t/p/w300/null这是没有得到 posterPath 的 Picasso URL .我将不得不找出为什么我得到的是 null 而不是图像。至少，这意味着订阅工作正常。
我将致力于 Picasso URL 修复。
我遗漏了什么:我忘记在 Action1<> 中添加数组列表Subscription的来电.这是我对订阅方法所做的更改:
private void getMoviesSubscription() {
movieSubscription = service.getPopularMovies(IntentKeys.POPULAR_MOVIES_API_KEY)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
new Action1<Result>() {
@Override
public void call(Result popularMovies) {
resultItems.add(popularMovies);
}
}, new Action1<Throwable>() {
@Override
public void call(Throwable throwable) {
}
}, new Action0() {
@Override
public void call() {
displayPosters();
Log.i(TAG, "getMoviesSubscription: Completed");
}
}
);
}
关于android - 图像未使用 Rx Observable 和 Retrofit2 加载 Picasso，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39461958/