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我想实现RecyclerView，显示来自JSONArray的数据。解析工作是完美的，但RecyclerView在每个项目中显示必须仅在最后一项中的信息。 There is the screenshot to make it clear.RecyclerView显示相同的项目
这里是我的代码：
MainActivity.java
public class MainActivity extends AppCompatActivity {
RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
protected void onCreate(Bundle savedInstanceState) {
setTheme(R.style.AppTheme);
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
new parseTask().execute();
}
private class parseTask extends AsyncTask<Void, Void, String> {
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
String resultJson = "";
ProgressDialog pdLoading = new ProgressDialog(MainActivity.this, R.style.MyDialogStyle);
@Override
protected void onPreExecute() {
super.onPreExecute();
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
@Override
protected String doInBackground(Void... params) {
try {
URL url = new URL("http://songo.eu.pn/db_GetFromSongs.php");
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();
InputStream inputStream = urlConnection.getInputStream();
StringBuffer buffer = new StringBuffer();
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
resultJson = buffer.toString();
} catch (Exception e) {
e.printStackTrace();
}
return resultJson;
}
@Override
protected void onPostExecute(String strJson) {
super.onPostExecute(strJson);
List<DataSongs> data = new ArrayList<>();
JSONObject dataJsonObj = null;
try {
dataJsonObj = new JSONObject(strJson);
JSONArray songs = dataJsonObj.getJSONArray("Songs");
DataSongs songData = new DataSongs();
for (int i = 0; i < songs.length(); i++) {
JSONObject song = songs.getJSONObject(i);
songData.songName = song.getString("song");
songData.songGenreID = song.getString("GenreID");
songData.songUserID = song.getString("UserID");
data.add(songData);
Log.e("songo", "SongName: " + data.get(i).songName);
}
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
mAdapter = new RecyclerAdapter(MainActivity.this, data, mRecyclerView);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(MainActivity.this);
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setLayoutManager(mLayoutManager);
} catch (JSONException e) {
e.printStackTrace();
}
pdLoading.dismiss();
}
}
RecyclerAdapter.java
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private Context context;
private LayoutInflater inflater;
List<DataSongs> data = Collections.emptyList();
public RecyclerAdapter(Context context, List<DataSongs> data, RecyclerView recyclerView) {
this.context = context;
inflater = LayoutInflater.from(context);
this.data = data;
this.recyclerView = recyclerView;
}
class ViewHolder extends RecyclerView.ViewHolder{
TextView tv_songName;
TextView tv_songGenreID;
TextView tv_songUserID;
public ViewHolder(View itemView) {
super(itemView);
tv_songName = (TextView) itemView.findViewById(R.id.tv_songName);
tv_songGenreID = (TextView) itemView.findViewById(R.id.tv_songGenreID);
tv_songUserID = (TextView) itemView.findViewById(R.id.tv_songUserID);
}
}
// Создает новые views (вызывается layout manager-ом)
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v=inflater.inflate(R.layout.recycler_item, parent,false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
DataSongs current = data.get(position);
holder.tv_songName.setText(current.songName);
holder.tv_songGenreID.setText(current.songGenreID);
holder.tv_songUserID.setText(current.songUserID);
Log.e("songo", "SongName: " + data.get(position).songName);
}
@Override
public int getItemCount() {
return data.size();
}
从MainActivity日志显示，它应该是信息（不等于线）。
来自RecyclerAdapter的日志显示每个songName都是一样的。
我觉得大部分的答案下面是有帮助的，但一个建议，可以用凌空抽射从服务器获取异步输入反应是，你的代码将不断获取复杂当你建立更多的功能。 Vollwy更清洁 –
添加此行（DataSongs songData = new DataSongs（）;）inside for循环 – Ragini
添加适配器后使用'mRecyclerView.setHasFixedSize（true）;'。 – Goran