我使用asynctask https://jsonplaceholder.typicode.com/users，但我采用了pojo对象。
我应该在两者之间添加代码？我应该写什么行，我应该怎么写？
DataRetriever.java
public DataRetriever(Activity activity) {
activityWeakReference = new WeakReference<>(activity);
current_activity = activityWeakReference.get();
}
@Override
protected void onPreExecute() {
imageView = (ImageView) current_activity.findViewById(R.id.imageView);
if (current_activity != null) {
recyclerView = (RecyclerView) current_activity.findViewById(R.id.recyclerView);
swipeRefreshLayout = (SwipeRefreshLayout) current_activity.findViewById(R.id.swipe_container);
swipeRefreshLayout.setColorSchemeResources(
android.R.color.holo_blue_bright,
android.R.color.holo_green_light,
android.R.color.holo_orange_light,
android.R.color.holo_red_light);
recyclerView.setHasFixedSize(true);
} else {
Log.d(TAG, "unable to get current activity");
Toast.makeText(current_activity, "unable to get current activity", Toast.LENGTH_SHORT).show();
}
super.onPreExecute();
progressDialog = new ProgressDialog(current_activity);
progressDialog.setMessage("Loading...");
progressDialog.show();
}
@SafeVarargs
@Override
protected final Integer doInBackground(List<String>... integers) {
HttpURLConnection httpURLConnection = null;
URL url;
List<String> local_list = integers[0];
type = Integer.parseInt(local_list.get(0));
String jsonString, jsonData;
return_status = 0;
switch (type) {
case 1:
url_string = "https://jsonplaceholder.typicode.com/users";
break;
case 2:
url_string = "https://jsonplaceholder.typicode.com/albums";
recieved_id = Integer.parseInt(local_list.get(1));
title = local_list.get(2);
break;
case 3:
url_string = "https://jsonplaceholder.typicode.com/photos";
recieved_id = Integer.parseInt(local_list.get(1));
title = local_list.get(2);
break;
}
try {
url = new URL(url_string);
httpURLConnection = (HttpURLConnection) url.openConnection();
int statusCode = httpURLConnection.getResponseCode();
if (statusCode == 200) {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
StringBuilder stringBuilder = new StringBuilder();
while ((jsonData = bufferedReader.readLine()) != null) {
stringBuilder.append(jsonData);
}
jsonString = stringBuilder.toString();
jsonParser(jsonString);
return_status = 1;
} else {
Log.d(TAG, "Some error occurred could'nt fetch data");
Toast.makeText(current_activity, "Some error occurred could'nt fetch data", Toast.LENGTH_SHORT).show();
return_status = 0;
}
publishProgress(local_list);
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
} finally {
if (httpURLConnection != null) {
httpURLConnection.disconnect();
}
}
return return_status;
}
private void jsonParser(String jsonString) {
int names_count, id;
String name;
try {
JSONArray jsonArray = new JSONArray(jsonString);
names_count = jsonArray.length();
if (!listValues.isEmpty())
listValues.clear();
if (!pictureValues.isEmpty())
pictureValues.clear();
for (int i = 0; i < names_count; i++) {
JSONObject array_items = jsonArray.getJSONObject(i);
ListValues jsonValues, pictureValue;
switch (type) {
case 1:
id = array_items.optInt("id");
name = array_items.optString("name");
jsonValues = new ListValues(id, name);
listValues.add(jsonValues);
break;
case 2:
id = array_items.optInt("userId");
name = array_items.optString("title");
if (id == recieved_id) {
jsonValues = new ListValues(id, name);
listValues.add(jsonValues);
}
break;
case 3:
id = array_items.optInt("albumId");
name = array_items.optString("title");
String pictureURL = array_items.getString("url");
if (id == recieved_id) {
jsonValues = new ListValues(id, name);
pictureValue = new ListValues(id, pictureURL);
listValues.add(jsonValues);
pictureValues.add(pictureValue);
}
break;
}
}
} catch (JSONException e) {
Log.d(TAG, e.getLocalizedMessage());
}
}
@Override
protected void onProgressUpdate(final List<String>... values) {
List<String> progressList = values[0];
Log.d(TAG, progressList.get(0));
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
switch (type) {
case 1:
new DataRetriever(current_activity).execute(values[0]);
case 2:
new DataRetriever(current_activity).execute(values[0]);
case 3:
new DataRetriever(current_activity).execute(values[0]);
}
}
});
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(final Integer integer) {
if (integer != 0) {
recyclerAdapter = new RecyclerAdapter(listValues);
recyclerView.addItemDecoration(new ListItemDecorator(current_activity.getApplicationContext()));
recyclerView.setAdapter(recyclerAdapter);
// use a linear layout manager
mLayoutManager = new LinearLayoutManager(current_activity);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
if (swipeRefreshLayout.isRefreshing())
swipeRefreshLayout.setRefreshing(false);
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(current_activity.getApplicationContext(), recyclerView, new ClickListener() {
@Override
public void onClick(View view, int position) {
String pictureURL = null;
ListValues feed = listValues.get(position);
if (!pictureValues.isEmpty()) {
ListValues feed2 = pictureValues.get(position);
pictureURL = feed2.getValue();
}
String value = feed.getValue();
switch (type) {
case 1:
intent = new Intent(current_activity, AlbumActivity.class);
intent.putExtra("id", (position + 1));
intent.putExtra("value", value);
current_activity.startActivity(intent);
break;
case 2:
intent = new Intent(current_activity, PhotosActivity.class);
intent.putExtra("id", (position + 1));
intent.putExtra("value", value);
current_activity.startActivity(intent);
break;
case 3:
intent = new Intent(current_activity, ImageDisplay.class);
intent.putExtra("imageUrl", pictureURL);
current_activity.startActivity(intent);
break;
}
}
@Override
public void onLongClick(View view, int position) {
}
}));
} else {
// Log.d(TAG, "unable to get data");
if (swipeRefreshLayout.isRefreshing()) {
Toast.makeText(current_activity, "Unable to refresh data! Try opening application again", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(current_activity, "Failed to fetch data! try again", Toast.LENGTH_SHORT).show();
}
}
super.onPostExecute(integer);
progressDialog.dismiss();
}
public interface ClickListener {
void onClick(View view, int position);
void onLongClick(View view, int position);
}
public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {
private GestureDetector gestureDetector;
private ClickListener clickListener;
public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener clickListener) {
this.clickListener = clickListener;
gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
@Override
public void onLongPress(MotionEvent e) {
View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null) {
clickListener.onLongClick(child, recyclerView.getChildPosition(child));
}
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
clickListener.onClick(child, rv.getChildPosition(child));
}
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
}
Post.java
public class Post implements Serializable {
@SerializedName("userId")
private int userId;
@SerializedName("name")
@Expose
public String name;
@SerializedName("id")
private int id;
@SerializedName("title")
private String title;
@SerializedName("body")
private String body;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
}
您对我的重要建议
谢谢！
答案 0 :(得分：0)
您可以使用GSON和POJO轻松完成此操作
首先..你需要创建几个模型
Post.java
public class Post
{
private String id;
private String phone;
private String username;
private String website;
private Address address;
private String email;
private Company company;
private String name;
//setter and getter
}
Company.java
public class Company
{
private String catchPhrase;
private String name;
private String bs;
//setter and getter
}
Address.java
public class Address
{
private Geo geo;
private String zipcode;
private String street;
private String suite;
private String city;
//setter and getter
}
Geo.java
public class Geo
{
private String lng;
private String lat;
//setter and getter
}
之后，您将从API获得json字符串。用Gson解析它..
List<Post> post = new Gson().fromJson(YOUR_JSON_STRING,new TypeToken<List<Post>>() {}.getType());