如何expandableView在 RecyclerView 中添加一个？我在以下代码中实现可扩展视图时遇到问题。在图片中，我从json. 如何在 RecyclerView 中实现展开和折叠？我被这段代码困了很长时间。
public class MainActivity extends AppCompatActivity {
private String url = "http://mantras.happylife.in/mantras_api";
private RecyclerView mList;
private LinearLayoutManager linearLayoutManager;
private DividerItemDecoration dividerItemDecoration;
private List<Mantras> mantraList;
private RecyclerView.Adapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mList = findViewById(R.id.main_list);
mantraList = new ArrayList<>();
adapter = new MantraAdapter(getApplicationContext(),mantraList);
linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
dividerItemDecoration = new DividerItemDecoration(mList.getContext(), linearLayoutManager.getOrientation());
mList.setHasFixedSize(true);
mList.setLayoutManager(linearLayoutManager);
mList.addItemDecoration(dividerItemDecoration);
mList.setAdapter(adapter);
mList.addOnItemTouchListener(
new RecyclerItemClickListener(this, mList ,new RecyclerItemClickListener.OnItemClickListener() {
@Override public void onItemClick(View view, int position) {
ViewGroup vg = (ViewGroup) view;
TextView ti = (TextView) vg.findViewById(R.id.title);
TextView de = (TextView) vg.findViewById(R.id.desc);
String selected = ti.getText().toString() + de.getText().toString();
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TEXT, selected);
startActivity(Intent.createChooser(intent, "Share via"));
}
})
);
getData();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menus,menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id==R.id.sync_data)
{
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading...");
progressDialog.show();
adapter.notifyDataSetChanged();
progressDialog.dismiss();
if (isNetworkAvailable()) {
Toast.makeText(this, "sync", Toast.LENGTH_SHORT).show();
Toast.makeText(this, "woohoo!", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "no internet connection..", Toast.LENGTH_SHORT).show();
}
}
return super.onOptionsItemSelected(item);
}
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager
= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
private void getData() {
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading...");
progressDialog.show();
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(url, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jsonObject = response.getJSONObject(i);
Mantras mantra = new Mantras();
String lineSep = System.getProperty("line.separator");
mantra.setTitle(jsonObject.getString("title"));
mantra.setDesc(jsonObject.getString("desc"));
mantra.desc= mantra.desc.replace("<br />", lineSep);
mantra.desc= mantra.desc.replace("<p>", lineSep);
mantra.desc= mantra.desc.replace("</p>", lineSep);
mantra.desc= mantra.desc.replace("<li>", lineSep);
mantra.desc= mantra.desc.replace("</li>", lineSep);
mantra.desc= mantra.desc.replace("<ol>", lineSep);
mantra.desc= mantra.desc.replace("</ol>", lineSep);
mantra.desc= mantra.desc.replace("<ul>", lineSep);
mantra.desc= mantra.desc.replace("</ul>", lineSep);
mantraList.add(mantra);
} catch (JSONException e) {
e.printStackTrace();
progressDialog.dismiss();
}
}
adapter.notifyDataSetChanged();
progressDialog.dismiss();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("Volley", error.toString());
progressDialog.dismiss();
}
}) {
@Override
protected Response<JSONArray> parseNetworkResponse(NetworkResponse response) {
try {
Cache.Entry cacheEntry = HttpHeaderParser.parseCacheHeaders(response);
if (cacheEntry == null) {
cacheEntry = new Cache.Entry();
}
final long cacheHitButRefreshed = 3 * 60 * 1000; // in 3 minutes cache will be hit, but also refreshed on background
final long cacheExpired = 24 * 60 * 60 * 1000; // in 24 hours this cache entry expires completely
long now = System.currentTimeMillis();
final long softExpire = now + cacheHitButRefreshed;
final long ttl = now + cacheExpired;
cacheEntry.data = response.data;
cacheEntry.softTtl = softExpire;
cacheEntry.ttl = ttl;
String headerValue;
headerValue = response.headers.get("Date");
if (headerValue != null) {
cacheEntry.serverDate = HttpHeaderParser.parseDateAsEpoch(headerValue);
}
headerValue = response.headers.get("Last-Modified");
if (headerValue != null) {
cacheEntry.lastModified = HttpHeaderParser.parseDateAsEpoch(headerValue);
}
cacheEntry.responseHeaders = response.headers;
final String jsonString = new String(response.data,
HttpHeaderParser.parseCharset(response.headers));
return Response.success(new JSONArray(jsonString), cacheEntry);
} catch (UnsupportedEncodingException | JSONException e) {
return Response.error(new ParseError(e));
}
}
@Override
protected void deliverResponse(JSONArray response) {
super.deliverResponse(response);
}
@Override
public void deliverError(VolleyError error) {
super.deliverError(error);
}
@Override
protected VolleyError parseNetworkError(VolleyError volleyError) {
return super.parseNetworkError(volleyError);
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonArrayRequest);
}
}
Below is the `Mantra Adapter`:
package happy.life.mantras;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.List;
public class MantraAdapter extends RecyclerView.Adapter<MantraAdapter.ViewHolder>{
private Context context;
private List<Mantras> list;
boolean isPlay = false;
public MantraAdapter(Context context, List<Mantras> list) {
this.context = context;
this.list = list;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(context).inflate(R.layout.single_item, parent, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
Mantras movie = list.get(position);
holder.textTitle.setText(movie.getTitle());
holder.textDesc.setText(String.valueOf(movie.getDesc()));
holder.textTitle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(isPlay){
holder.textDesc.setVisibility(View.GONE);
}else{
holder.textDesc.setVisibility(View.VISIBLE);
}
isPlay = !isPlay;
}
});
}
@Override
public int getItemCount() {
return list.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView textTitle, textDesc;
public ViewHolder(View itemView) {
super(itemView);
textTitle = itemView.findViewById(R.id.title);
textDesc = itemView.findViewById(R.id.desc);
}
}
}