如何在Android中的片段中加载JSON数据
作者：互联网
我想在我的活动中显示3个片段,并从json中的任何片段加载数据！我想将每个json数据显示为一个片段,但在我的应用程序中显示所有片段中的所有数据！
例如：我想将文章数据显示为文章片段,将音乐数据显示为音乐片段等等.但现在显示所有片段中的所有数据(文章,音乐,视频)！
在我的应用程序中,我使用EventBus发送数据,并使用一个DataModel将json数据保存到其中.
片段1：
public class free_fragment extends Fragment {
private RecyclerView mRecyclerView;
private free_recycler_adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private List<DataModel> dataModels = new ArrayList<DataModel>();
private Context context;
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_free_layout, container, false);
context = getContext();
if (!EventBus.getDefault().isRegistered(this)) {
EventBus.getDefault().register(this);
}
LoadData();
///----- RecyclerView -----
mRecyclerView = (RecyclerView) view.findViewById(R.id.pdf_RecyclerView);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
mAdapter = new free_recycler_adapter(context, dataModels);
mRecyclerView.setAdapter(mAdapter);
return view;
}
@Subscribe
public void onEvent(List<DataModel> mainInfoModels) {
/* if (dataModels.size() > 0) {
dataModels.remove(dataModels.size() - 1);
mAdapter.notifyItemRemoved(dataModels.size());
//mAdapter.setLoaded();
}*/
mAdapter.add(mainInfoModels);
mAdapter.notifyDataSetChanged();
}
private void LoadData() {
freeDataInfo dataInfo = new freeDataInfo();
// here getMainDataInfo() should return the server response
dataInfo.getFreeDataInfo(context);
}
片段2：
public class paid_fragment extends Fragment {
private RecyclerView mRecyclerView;
private paid_recycler_adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private List<DataModel> dataModels = new ArrayList<DataModel>();
private Context context;
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_paid_layout, container, false);
context = getContext();
if (!EventBus.getDefault().isRegistered(this)) {
EventBus.getDefault().register(this);
}
LoadData();
///----- RecyclerView -----
mRecyclerView = (RecyclerView) view.findViewById(R.id.voice_RecyclerView);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
mAdapter = new paid_recycler_adapter(context, dataModels);
mRecyclerView.setAdapter(mAdapter);
return view;
}
@Subscribe
public void onEvent(List<DataModel> mainInfoModels) {
/* if (dataModels.size() > 0) {
dataModels.remove(dataModels.size() - 1);
mAdapter.notifyItemRemoved(dataModels.size());
//mAdapter.setLoaded();
}*/
mAdapter.add(mainInfoModels);
mAdapter.notifyDataSetChanged();
}
private void LoadData() {
paidDataInfo dataInfo = new paidDataInfo();
// here getMainDataInfo() should return the server response
dataInfo.getPaidDataInfo(context);
}
片段1的AsyncTask代码：
public class freeDataInfo {
private Context mContext ;
private String ServerAddress = freeServer_IP.getFreeIP();
public void getFreeDataInfo(Context context) {
mContext = context;
new getInfo().execute(ServerAddress + "limit=10");
}
private class getInfo extends AsyncTask<String, Void, String> {
EventBus bus = EventBus.getDefault();
private String ou_response;
private List<DataModel> infoModels;
@Override
protected void onPreExecute() {
CustomProcessDialog.createAndShow(mContext);
infoModels = new ArrayList<>();
}
@Override
protected String doInBackground(String... params) {
OkHttpClient client = new OkHttpClient();
//String url = (String) params[0];
Request request = new Request.Builder()
.url(ServerAddress + "limit=10")
.cacheControl(CacheControl.FORCE_NETWORK)
.build();
Response response;
try {
response = client.newCall(request).execute();
ou_response = response.body().string();
response.body().close();
if (ou_response != null) {
try {
JSONObject postObj = new JSONObject(ou_response);
JSONArray postsArray = postObj.optJSONArray("result");
infoModels = new ArrayList<>();
for (int i = 0; i <= infoModels.size(); i++) {
JSONObject postObject = (JSONObject) postsArray.get(i);
int id = postObject.getInt("id");
Log.d("id", String.valueOf(id));
String title = postObject.getString("title");
String description = postObject.getString("description");
String image = postObject.getString("image");
String category = postObject.getString("categoryName");
String date = postObject.getString("publishDate");
Log.d("Data", "Post ID: " + id);
Log.d("Data", "Post title: " + title);
Log.d("Data", "Post image: " + image);
Log.d("Data", "---------------------------------");
//Use the title and id as per your requirement
infoModels.add(new DataModel(id, title, description, category, date, image));
}
} catch (JSONException e) {
e.printStackTrace();
Log.e("error", String.valueOf(e));
}
}
} catch (IOException e) {
e.printStackTrace();
Log.e("error2", String.valueOf(e));
}
return ou_response;
}
@Override
protected void onPostExecute(String result) {
CustomProcessDialog.dissmis();
if (result != null) {
bus.post(infoModels);
} else {
Toast.makeText(mContext, "Empty", Toast.LENGTH_SHORT).show();
}
}
}
}
片段2的AsyncTask代码：
public class paidDataInfo {
private Context mContext;
private String ServerAddress = paidServer_IP.getPaidIP();
public void getPaidDataInfo(Context context) {
mContext = context;
new getInfo().execute(ServerAddress + "limit=10");
}
private class getInfo extends AsyncTask<String, Void, String> {
EventBus bus = EventBus.getDefault();
private String ou_response;
private List<DataModel> infoModels;
@Override
protected void onPreExecute() {
CustomProcessDialog.createAndShow(mContext);
infoModels = new ArrayList<>();
}
@Override
protected String doInBackground(String... params) {
OkHttpClient client = new OkHttpClient();
//String url = (String) params[0];
Request request = new Request.Builder()
.url(ServerAddress + "limit=10")
.cacheControl(CacheControl.FORCE_NETWORK)
.build();
Response response;
try {
response = client.newCall(request).execute();
ou_response = response.body().string();
response.body().close();
if (ou_response != null) {
try {
JSONObject postObj = new JSONObject(ou_response);
JSONArray postsArray = postObj.optJSONArray("result");
infoModels = new ArrayList<>();
for (int i = 0; i <= infoModels.size(); i++) {
JSONObject postObject = (JSONObject) postsArray.get(i);
int id = postObject.getInt("id");
Log.d("id", String.valueOf(id));
String title = postObject.getString("title");
String description = postObject.getString("description");
String image = postObject.getString("image");
String category = postObject.getString("categoryName");
String date = postObject.getString("publishDate");
Log.d("Data", "Post ID: " + id);
Log.d("Data", "Post title: " + title);
Log.d("Data", "Post image: " + image);
Log.d("Data", "---------------------------------");
//Use the title and id as per your requirement
infoModels.add(new DataModel(id, title, description, category, date, image));
}
} catch (JSONException e) {
e.printStackTrace();
Log.e("error", String.valueOf(e));
}
}
} catch (IOException e) {
e.printStackTrace();
Log.e("error2", String.valueOf(e));
}
return ou_response;
}
@Override
protected void onPostExecute(String result) {
CustomProcessDialog.dissmis();
if (result != null) {
bus.post(infoModels);
} else {
Toast.makeText(mContext, "Empty", Toast.LENGTH_SHORT).show();
}
}
}
}
我该如何解决这个问题？
解决方法:
您总是为每个片段发布相同的事件,然后获得所有片段中的所有项目.
发布EventBus时需要一个类：
public class MyEvent {
private String fragmentTag ;
private ArrayList<DataModel> infoModels ;
public MyEvent (String tag,ArrayList<DataModel> models){
this.fragmentTag = tag;
this.infoModels = models;
}
}
然后像这样发布：
bus.post(new MyEvent ("forfragment1",infoModels) );
然后在您的Fragment1中：
@Subscribe
public void onEvent(MyEvent event) {
if(event.fragmentTag.equals("forfragment1"))
{
//populate your view , do something
}
}
private void LoadData() {
freeDataInfo dataInfo = new freeDataInfo();
// here getMainDataInfo() should return the server response
dataInfo.getFreeDataInfo(context);
}
标签：android-json,android-fragments,android-asynctask,android 来源： https://codeday.me/bug/20191118/2029126.html