Java 如何在单击时将数据更新到recylerview
我正在开发一个应用程序,其中我获取JSON数据,并将其显示在recylcer视图中。现在单击recycler视图,根据单击的项目,我需要从服务器获取JSON数据,并将其显示在相同的recycler视图中。它是一种递归函数。我什么也找不到 在Java 如何在单击时将数据更新到recylerview,java,android,android-recyclerview,Java,Android,Android Recyclerview,我正在开发一个应用程序,其中我获取JSON数据,并将其显示在recylcer视图中。现在单击recycler视图,根据单击的项目,我需要从服务器获取JSON数据,并将其显示在相同的recycler视图中。它是一种递归函数。我什么也找不到 在main活动中,我创建了一个用于执行网络任务的内部类 new LauncherLoadThread(rootView).execute(appUsername, appPassword, loadURL, path); class LauncherLoa
main活动中
,我创建了一个用于执行网络任务的内部类
new LauncherLoadThread(rootView).execute(appUsername, appPassword, loadURL, path);
class LauncherLoadThread extends AsyncTask<String, Integer, String[]> {
private View rootView;
public LauncherLoadThread(View rootView) {
this.rootView = rootView;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
progressBar.setVisibility(View.VISIBLE);
}
@Override
protected void onPostExecute(String[] strings) {
super.onPostExecute(strings);
progressBar.setVisibility(View.GONE);
if (strings != null) {
if (strings[0].contentEquals("200")) {
try {
String data = strings[1];
Log.d("Data", data);
JSONArray allData = new JSONArray(data);
for (int i = 0; i < allData.length(); i++) {
JSONObject jsonObject = allData.getJSONObject(i);
String id = jsonObject.getString("id");
String name = jsonObject.getString("name");
String path = jsonObject.getString("path");
String leaf = jsonObject.getString("leaf");
Log.d("Loaded Data: ", "Id: " + id + ". name: " + name + ". Path: " + path);
LauncherModel launcherModel=new LauncherModel(id,name,leaf,path);
launcherModelList.add(launcherModel);
}
adapter=new LauncherAdapter(launcherModelList,getContext());
launcherRecyclerView.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Snackbar snackbar = Snackbar.make(rootView, strings[0] + " Something broke down.", Snackbar.LENGTH_LONG);
View snackBarView = snackbar.getView();
TextView tv = (TextView) snackBarView.findViewById(android.support.design.R.id.snackbar_text);
snackbar.show();
}
} else {
Snackbar snackbar = Snackbar.make(rootView, "Oops something went wrong.", Snackbar.LENGTH_LONG);
View snackBarView = snackbar.getView();
TextView tv = (TextView) snackBarView.findViewById(android.support.design.R.id.snackbar_text);
snackbar.show();
}
}
@Override
protected String[] doInBackground(String... strings) {
String username = strings[0];
String password = strings[1];
String url = strings[2];
String path=strings[3];
String processURL="";
if(path.equals("")) {
processURL=url+"?path=Library";
}else {
processURL=url+"?path=" + path;
}
Log.d("doInBackURL", url);
String credential = Credentials.basic(username, password);
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(url)
.get()
.addHeader("authorization", credential)
.addHeader("content-type", "application/json")
.build();
try {
Response response = client.newCall(request).execute();
if (response.isSuccessful()) {
String body = response.body().string();
Log.d("Body--->",body);
String code = response.code() + "";
Log.d("Code--->",code);
String[] output = {code, body};
return output;
} else {
String body = "Error: 404";
String code = response.code() + "";
String[] output = {code, body};
return output;
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
根据您使用的体系结构,这里有许多选项。基本上,您可以创建类似于
MyCustomItemClickListener
的界面:
interface MyCustomItemClickListener {
void onClick();
}
然后通过与RecyclerView相关的活动扩展MyCustomItemClickListener
,并覆盖其方法:
@Override
public void onClick(){
// basically, here goes the logic you want on click
}
由于我假设您在适配器中已经有ViewHolder
,因此简单的选择是将Activity
作为自定义Listener
传递到适配器中。然后,如果我们选择此选项,其工作原理如下:
//adapter's inner
class SomeClassViewHolder(val view: View) extends RecyclerView.ViewHolder(view) {
//here can be view initializing, like
txtHeader = (TextView) view.findViewById(R.id.audio_subtitle);
void bind(int position){
// all view binding logic goes here, for example:
txtHeader.setText("someText");
// AND here is also your listener working:
view.setOnClickListener{
listener.onItemClick(item)
}
}
}
//and then in adapter
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
holder.bind(values.get(position));
}
这里唯一的技巧是将视图(活动或片段)作为侦听器传递给自定义适配器,它应该可以工作
编辑:当然,使用这种方法,您只需使用自己的逻辑从活动中重新加载数据,如发出另一个异步请求。您只需调用notifyDataSetChanged()适配器类的函数。onClick中需要哪些数据?在onClick
中,使用新数据创建LauncherAdapter
的新实例,并将其设置为RecycleWits,如递归文件和文件夹,单击文件夹后,该文件夹中的文件和文件夹应在回收器视图Folder1 Folder1.1 Folder1.1.1 Folder1.1.2 Folder1.1.3 File1.1中填充。清除列表中的数据后,按list.cler()datanotifyetchanged()再次添加所需的数据notifyDataSetChanged()像冠军一样工作:)
//adapter's inner
class SomeClassViewHolder(val view: View) extends RecyclerView.ViewHolder(view) {
//here can be view initializing, like
txtHeader = (TextView) view.findViewById(R.id.audio_subtitle);
void bind(int position){
// all view binding logic goes here, for example:
txtHeader.setText("someText");
// AND here is also your listener working:
view.setOnClickListener{
listener.onItemClick(item)
}
}
}
//and then in adapter
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
holder.bind(values.get(position));
}