回收视图加载列表，并通过mList.add（0，actor）到达顶部，但我想反转该列表。
我也这样修改我的代码
mLayoutManager.setReverseLayout(true);
mList.add(0,actor);
这是我的recycleview信息，这是我的recycleview api代码InfoJson（）：
public class GatekeeperInfoActivity extends BaseActivity implements View.OnClickListener , MyComplaintListner {
private RecyclerView mRecyclerView;
private GateInfoAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private List<GateInfoPojo> mList;
Context ctx;
String visitor_id,id,cid;
M_Shared_Pref m_shared_pref;
ImageView back_button, img;
private MyDialog dialog;
TextView complaint,subject,msg,from_name_txt;
ImageView attach;
String from_id,from_name,from_mobile;
String id_rwa,new_id;
public static final int DISMISS_TIMEOUT = 2000;
LinearLayout ll_no_data;
int limit =0;
int limit_refresh;
static int nums;
private appconfig.EndlessRecyclerOnScrollListener scrollListener;
LinearLayoutManager linearLayoutManager;
public int overallXScrol = 0;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.rwa_view_info);
ctx = GatekeeperInfoActivity.this;
dialog = new MyDialog(this);
m_shared_pref = new M_Shared_Pref(GatekeeperInfoActivity.this);
visitor_id = m_shared_pref.getPrefranceStringValue(App_Info.Visitor_ID);
id = m_shared_pref.getPrefranceStringValue(App_Info.Flat_User_Id);
cid = m_shared_pref.getPrefranceStringValue(App_Info.Flat_User_Id_cid);
Bundle bundle = this.getIntent().getExtras();
from_id = bundle.getString("id");
from_name = bundle.getString("name");
from_mobile = bundle.getString("mobile");
id_rwa = getIntent().getStringExtra("id_rwa");
if (from_id != null && !from_id.isEmpty() && !from_id.equals("null"))
{ new_id = from_id; }
else{ new_id = id_rwa; }
System.out.println("check:check"+from_id+":"+id_rwa);
///// using this new_id
mList = new ArrayList<GateInfoPojo>();
mRecyclerView = findViewById(R.id.my_recycler_view);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mAdapter = new GateInfoAdapter(mList, ctx);
ll_no_data = findViewById(R.id.ll_no_data);
mAdapter.setMyClickListener(this);
/* button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
limit_refresh = nums+limit;
limit = limit_refresh;
if(nums>=20){
// item_progress_bar.setVisibility(View.VISIBLE);
InfoJson();
}
}
});*/
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (!recyclerView.canScrollVertically(-1)) {
// Toast.makeText(GatekeeperInfoActivity.this, "Last", Toast.LENGTH_LONG).show();
limit_refresh = nums+limit;
limit = limit_refresh;
if(nums>=20){
// item_progress_bar.setVisibility(View.VISIBLE);
InfoJson();
}
}
}
});
img = findViewById(R.id.pic);
from_name_txt = findViewById(R.id.from_name_txt);
attach = findViewById(R.id.attach);
msg = findViewById(R.id.msg);
complaint = findViewById(R.id.complaint);
subject = findViewById(R.id.subject);
back_button = findViewById(R.id.back_button);
back_button.setOnClickListener(this);
attach.setOnClickListener(this);
if(NetWorkCheck.checkConnection(GatekeeperInfoActivity.this)){
mList.clear();
InfoJson();
}
else{
TastyToast.makeText(getApplicationContext(), "Internet connection is disable", TastyToast.LENGTH_LONG, TastyToast.WARNING);
}
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.back_button:
finish();
break;
case R.id.attach:
if(msg.getText().toString().length()>0){
submitReply(msg.getText().toString(),new_id);
}
else{
TastyToast.makeText(getApplicationContext(), "Enter Message", TastyToast.LENGTH_LONG, TastyToast.INFO);
}
break;
}
}
public void InfoJson() {
dialog.ShowProgressDialog();
RequestQueue requestQueue = Volley.newRequestQueue(this);
StringRequest stringRequest = new StringRequest(Request.Method.POST, Constant.Base_Url+"AllChatWithUser.php?", new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
dialog.CancelProgressDialog();
JSONObject obj = new JSONObject(response);
String error = obj.getString("error");
nums = obj.getInt("nums");
System.out.println("limit_limit_num"+nums);
if(nums>=1) {
if (error.equals("true")) {
from_name_txt.setText("GateKeeper : " + obj.getString("names"));
JSONArray tower = obj.getJSONArray("Flat");
for (int i = 0; i < tower.length(); i++) {
JSONObject jsonnew = tower.getJSONObject(i);
GateInfoPojo actor = new GateInfoPojo();
String id = jsonnew.getString("id");
String Reply_From = jsonnew.getString("reply_from");
String message = jsonnew.getString("message");
String reply_date = jsonnew.getString("send_time");
String usertype = jsonnew.getString("usertype");
actor.setId(id);
actor.setReply_from(Reply_From);
actor.setMessage(message);
actor.setSend_time(reply_date);
actor.setUsertype(usertype);
if(limit==0){
mList.add(actor);
}
else{
mList.add(0,actor);
}
mAdapter.notifyDataSetChanged();
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.getLayoutManager().scrollToPosition(nums - 1);
}
}
}
else
{
mRecyclerView.setVisibility(View.GONE);
ll_no_data.setVisibility(View.VISIBLE);
// TastyToast.makeText(getApplicationContext(), obj.getString("msg"), TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
dialog.CancelProgressDialog();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<>();
params.put("empid", new_id);
params.put("fid", id);
params.put("usertype", "FlatUser");
params.put("limit", String.valueOf(limit));
Log.e("params", String.valueOf(params));
return params;
}
};
requestQueue.add(stringRequest);
}
@Override
public void onItemClick(View v, Object bean, String feed, String rating,String comp_spinner) {
String complaint_id = ((GateInfoPojo) bean).getId();
// submitComplaintInfo(complaint_id,feed,rating,comp_spinner);
}
@Override
public void onItemClickActivity(View v, Object bean) {
String complaint_id = ((GateInfoPojo) bean).getId();
}
public void submitReply(final String msg1,final String new_id) {
dialog.ShowProgressDialog();
RequestQueue requestQueue = Volley.newRequestQueue(this);
StringRequest stringRequest = new StringRequest(Request.Method.POST, Constant.Base_Url+"ChatWithUser.php?", new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
dialog.CancelProgressDialog();
JSONObject obj = new JSONObject(response);
String error = obj.getString("error");
if (error.equals("true"))
{
// TastyToast.makeText(getApplicationContext(), obj.getString("msg"), TastyToast.LENGTH_LONG, TastyToast.SUCCESS);
msg.setText("");
InfoJson();
mList.clear();
}
else
{
TastyToast.makeText(getApplicationContext(), obj.getString("msg"), TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
dialog.CancelProgressDialog();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<>();
params.put("fid", id);
params.put("empid", new_id);
params.put("usertype", "FlatUser");
params.put("message", msg1);
Log.e("params", String.valueOf(params));
return params;
}
};
requestQueue.add(stringRequest);
}
}
但这无法正常工作，但不能将api数据自下而上反转。 任何帮助将不胜感激。
答案 0 :(得分：0)
您可以通过-
反转阵列列表Collections.reverse(mList);
之后，根据您的要求setAdapter()或notifyDataSetChanged()。
public void InfoJson() {
dialog.ShowProgressDialog();
RequestQueue requestQueue = Volley.newRequestQueue(this);
StringRequest stringRequest = new StringRequest(Request.Method.POST, Constant.Base_Url+"AllChatWithUser.php?", new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
dialog.CancelProgressDialog();
JSONObject obj = new JSONObject(response);
String error = obj.getString("error");
nums = obj.getInt("nums");
System.out.println("limit_limit_num"+nums);
if(nums>=1) {
if (error.equals("true")) {
from_name_txt.setText("GateKeeper : " + obj.getString("names"));
JSONArray tower = obj.getJSONArray("Flat");
for (int i = 0; i < tower.length(); i++) {
JSONObject jsonnew = tower.getJSONObject(i);
GateInfoPojo actor = new GateInfoPojo();
String id = jsonnew.getString("id");
String Reply_From = jsonnew.getString("reply_from");
String message = jsonnew.getString("message");
String reply_date = jsonnew.getString("send_time");
String usertype = jsonnew.getString("usertype");
actor.setId(id);
actor.setReply_from(Reply_From);
actor.setMessage(message);
actor.setSend_time(reply_date);
actor.setUsertype(usertype);
if(limit==0){
mList.add(actor);
}
else{
mList.add(0,actor);
}
}
Collections.reverse(mList);
mAdapter.notifyDataSetChanged();
mRecyclerView.setAdapter(mAdapter);
// mRecyclerView.getLayoutManager().scrollToPosition(nums - 1);
}
}
else
{
mRecyclerView.setVisibility(View.GONE);
ll_no_data.setVisibility(View.VISIBLE);
// TastyToast.makeText(getApplicationContext(), obj.getString("msg"), TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
dialog.CancelProgressDialog();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<>();
params.put("empid", new_id);
params.put("fid", id);
params.put("usertype", "FlatUser");
params.put("limit", String.valueOf(limit));
Log.e("params", String.valueOf(params));
return params;
}
};
requestQueue.add(stringRequest);
}
答案 1 :(得分：0)
尝试添加以下代码，这两个代码都必须为真。
mLayoutManager.setStackFromEnd(true);
mLayoutManager.setReverseLayout(true);
答案 2 :(得分：0)
由于您的列表尚无数据，因此从OnCreate()中删除您的setadapter。
，然后在您的onResponse()中反转列表数据，然后对其进行设置
Collections.reverse(mList);
mAdapter = new GateInfoAdapter(mList, ctx);
mRecyclerView.setAdapter(mAdapter);