编辑：模拟器没有互联网：/如果您遇到此问题，请尝试转到AVD管理器并擦除模拟器。
在我添加适配器之前，我的代码正在工作，但我已经三重检查了它，我的 asynhttprequest 仍然不起作用(在它返回状态代码 200 以及结果和电影变量之前(。 任何想法都值得赞赏，我已经尝试了模拟器和手机，所以我知道互联网不是问题。
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.flixster">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
MainActivity.java:
public class MainActivity extends AppCompatActivity {
public static final String NOW_PLAYING_URL = "https://api.themoviedb.org/3/movie/now_playing?api_key=a07e22bc18f5cb106bfe4cc1f83ad8ed";
public static final String TAG = "MainActivity";
List<Movie> movies;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView rvMovies = findViewById(R.id.rvMovies);
movies = new ArrayList<>();
// Create the adapter
final MovieAdapter movieAdapter = new MovieAdapter(this, movies);
// Set the adapter on the recycler view
rvMovies.setAdapter(movieAdapter);
// Set a Layout Manager on the recycler view
rvMovies.setLayoutManager(new LinearLayoutManager(this));
AsyncHttpClient client = new AsyncHttpClient();
client.get(NOW_PLAYING_URL, new JsonHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Headers headers, JSON json) {
Log.d(TAG, "onSuccess");
JSONObject jsonObject = json.jsonObject;
try {
JSONArray results = jsonObject.getJSONArray("results");
Log.i(TAG, "Results: " + results.toString());
movies.addAll(Movie.fromJsonArray(results));
// whenever data changes, rerender recycler view
//movieAdapter.notifyDataSetChanged();
Log.i(TAG, "Movies: " + movies.size());
} catch (JSONException e) {
Log.e(TAG, "Hit json exception", e);
e.printStackTrace();
}
}
@Override
public void onFailure(int statusCode, Headers headers, String response, Throwable throwable) {
Log.d(TAG, "onFailure");
}
});
}}
Movie.java
public class Movie {
String posterPath;
String title;
String overview;
public Movie (JSONObject jsonObject) throws JSONException {
posterPath = jsonObject.getString("poster_path");
title = jsonObject.getString("title");
overview = jsonObject.getString("overview");
}
// Iterates through data from results array returned by MainActivity.java into individual movie objects
public static List<Movie> fromJsonArray(JSONArray movieJsonArray) throws JSONException {
List<Movie> movies = new ArrayList<>();
for (int i = 0; i < movieJsonArray.length(); i++){
movies.add(new Movie(movieJsonArray.getJSONObject(i)));
}
return movies;
}
// TODO: figure out what sizes are available and then append to url before posterPath
public String getPosterPath() {
return String.format("https://image.tmdb.org/t/p/w342/%s", posterPath);
}
public String getTitle() {
return title;
}
public String getOverview() {
return overview;
}
}
MovieAdapter.java
public class MovieAdapter extends RecyclerView.Adapter<MovieAdapter.ViewHolder> {
Context context;
List<Movie> movies;
public MovieAdapter (Context context, List<Movie>movies) {
this.context = context;
this.movies = movies;
}
// Usually involves inflating a layout from XML and returning the holder
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View movieView = LayoutInflater.from(context).inflate(R.layout.item_movie, parent, false);
return new ViewHolder(movieView);
}
// Involves populating data into the item through holder
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
// Get the movie at the passed in position
Movie movie = movies.get(position);
// Bind the movie data into the viewholder
holder.bind(movie);
}
// Returns the total count of items in the list
@Override
public int getItemCount() {
return movies.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView tvTitle;
TextView tvOverview;
ImageView ivPoster;
public ViewHolder(@NonNull View itemView) {
super(itemView);
tvTitle = itemView.findViewById(R.id.tvTitle);
tvOverview = itemView.findViewById(R.id.tvOverview);
ivPoster= itemView.findViewById(R.id.ivPoster);
}
public void bind(Movie movie) {
tvTitle.setText(movie.getTitle());
tvOverview.setText(movie.getOverview());
Glide.with(context).load(movie.getPosterPath()).into(ivPoster);
}
}
}
StackTrace
2020-02-11 22:47:53.186 28424-28424/? I/xample.flixste: Not late-enabling -Xcheck:jni (already on)
2020-02-11 22:47:53.444 28424-28424/? E/xample.flixste: Unknown bits set in runtime_flags: 0x8000
2020-02-11 22:47:53.539 28424-28424/? W/xample.flixste: Unexpected CPU variant for X86 using defaults: x86
2020-02-11 22:47:55.018 28424-28462/com.example.flixster D/libEGL: Emulator has host GPU support, qemu.gles is set to 1.
2020-02-11 22:47:55.012 28424-28424/com.example.flixster W/RenderThread: type=1400 audit(0.0:168): avc: denied { write } for name="property_service" dev="tmpfs" ino=274 scontext=u:r:untrusted_app:s0:c134,c256,c512,c768 tcontext=u:object_r:property_socket:s0 tclass=sock_file permissive=0
2020-02-11 22:47:55.022 28424-28462/com.example.flixster W/libc: Unable to set property "qemu.gles" to "1": connection failed; errno=13 (Permission denied)
2020-02-11 22:47:55.082 28424-28462/com.example.flixster D/libEGL: loaded /vendor/lib/egl/libEGL_emulation.so
2020-02-11 22:47:55.114 28424-28462/com.example.flixster D/libEGL: loaded /vendor/lib/egl/libGLESv1_CM_emulation.so
2020-02-11 22:47:55.133 28424-28462/com.example.flixster D/libEGL: loaded /vendor/lib/egl/libGLESv2_emulation.so
2020-02-11 22:47:55.769 28424-28424/com.example.flixster W/xample.flixste: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed)
2020-02-11 22:47:55.770 28424-28424/com.example.flixster W/xample.flixste: Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed)
2020-02-11 22:47:56.241 28424-28424/com.example.flixster W/xample.flixste: Accessing hidden method Lcom/android/org/conscrypt/OpenSSLSocketImpl;->setUseSessionTickets(Z)V (greylist,core-platform-api, reflection, allowed)
2020-02-11 22:47:56.241 28424-28424/com.example.flixster W/xample.flixste: Accessing hidden method Lcom/android/org/conscrypt/OpenSSLSocketImpl;->setHostname(Ljava/lang/String;)V (greylist,core-platform-api, reflection, allowed)
2020-02-11 22:47:56.241 28424-28424/com.example.flixster W/xample.flixste: Accessing hidden method Lcom/android/org/conscrypt/OpenSSLSocketImpl;->getAlpnSelectedProtocol()[B (greylist,core-platform-api, reflection, allowed)
2020-02-11 22:47:56.241 28424-28424/com.example.flixster W/xample.flixste: Accessing hidden method Lcom/android/org/conscrypt/OpenSSLSocketImpl;->setAlpnProtocols([B)V (greylist,core-platform-api, reflection, allowed)
2020-02-11 22:47:56.241 28424-28424/com.example.flixster W/xample.flixste: Accessing hidden method Ldalvik/system/CloseGuard;->get()Ldalvik/system/CloseGuard; (greylist,core-platform-api, reflection, allowed)
2020-02-11 22:47:56.241 28424-28424/com.example.flixster W/xample.flixste: Accessing hidden method Ldalvik/system/CloseGuard;->open(Ljava/lang/String;)V (greylist,core-platform-api, reflection, allowed)
2020-02-11 22:47:56.241 28424-28424/com.example.flixster W/xample.flixste: Accessing hidden method Ldalvik/system/CloseGuard;->warnIfOpen()V (greylist,core-platform-api, reflection, allowed)
2020-02-11 22:47:56.242 28424-28424/com.example.flixster D/NetworkSecurityConfig: No Network Security Config specified, using platform default
2020-02-11 22:47:56.473 28424-28459/com.example.flixster D/HostConnection: HostConnection::get() New Host Connection established 0xe1632190, tid 28459
2020-02-11 22:47:56.491 28424-28459/com.example.flixster D/HostConnection: HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache ANDROID_EMU_async_unmap_buffer GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_gles_max_version_3_0
2020-02-11 22:47:56.597 28424-28459/com.example.flixster W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
2020-02-11 22:47:56.604 28424-28459/com.example.flixster D/eglCodecCommon: setVertexArrayObject: set vao to 0 (0) 0 0
2020-02-11 22:47:56.604 28424-28459/com.example.flixster D/EGL_emulation: eglCreateContext: 0xe161a120: maj 3 min 0 rcv 3
2020-02-11 22:47:56.609 28424-28459/com.example.flixster D/EGL_emulation: eglMakeCurrent: 0xe161a120: ver 3 0 (tinfo 0xe160f700)
2020-02-11 22:47:56.629 28424-28459/com.example.flixster W/Gralloc3: mapper 3.x is not supported
2020-02-11 22:47:56.633 28424-28459/com.example.flixster D/HostConnection: createUnique: call
2020-02-11 22:47:56.638 28424-28459/com.example.flixster D/HostConnection: HostConnection::get() New Host Connection established 0xe16322d0, tid 28459
2020-02-11 22:47:56.640 28424-28459/com.example.flixster D/HostConnection: HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache ANDROID_EMU_async_unmap_buffer GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_gles_max_version_3_0
2020-02-11 22:47:56.641 28424-28459/com.example.flixster D/eglCodecCommon: allocate: Ask for block of size 0x1000
2020-02-11 22:47:56.641 28424-28459/com.
example.flixster D/eglCodecCommon: allocate: ioctl allocate returned offset 0x3ff801000 size 0x2000
2020-02-11 22:47:56.666 28424-28459/com.example.flixster D/EGL_emulation: eglMakeCurrent: 0xe161a120: ver 3 0 (tinfo 0xe160f700)
2020-02-11 22:47:56.669 28424-28459/com.example.flixster D/eglCodecCommon: setVertexArrayObject: set vao to 0 (0) 1 0
2020-02-11 22:47:56.872 28424-28464/com.example.flixster D/MainActivity: onFailure
有两种方法
1.将以下属性添加到您的 AndroidManifest.xml 文件中。
android:usesCleartextTraffic="true"
原因
打算仅使用安全连接连接到目标的应用程序可以选择不支持明文(使用未加密的 HTTP 协议而不是 HTTPS(到这些目标。此选项有助于防止由于后端服务器等外部源提供的 URL 发生更改而导致应用中的意外回归
2.将 DNS 添加到您的 okhttp 客户端。
return OkHttpClient.Builder()
.dns(Dns.SYSTEM)
.connectTimeout(60, TimeUnit.SECONDS)
.readTimeout(60, TimeUnit.SECONDS)
.build()