我正在开发一个应用程序，它允许我创建用户帐户并搜索我的数据库中的其他用户，以便“熟悉”他们。搜索的用户在RecyclerView中的CardView中可见。如果用户尚未作为朋友连接到我的帐户，则应该在卡上显示“添加好友”按钮。如果用户与我的帐户以朋友身份连接，则卡上的添加好友按钮不应该是可见的。根据是否可以添加此人，将一个int值发送到Adapter类，描述是否显示该按钮。问题是它不会立即起作用。如果我搜索某人如何已经是朋友，该按钮将不会出现。如果我然后搜索不是朋友的人，则该按钮不会在第一时间出现。我将不得不再次搜索用户以使按钮可见。反过来也是这样。
我可以得到任何帮助。感谢??
卡的XML布局
<pre><code>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto">
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/cv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:background="@color/colorPrimary"
card_view:cardCornerRadius="10dp"
card_view:cardElevation="2dp">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:padding="16dp"
android:paddingBottom="16dp">
<ImageView
android:id="@+id/search_person_photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginEnd="16dp"
android:contentDescription="@string/contentDescr_searchImage" />
<TextView
android:id="@+id/search_person_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toEndOf="@+id/search_person_photo"
android:textColor="@color/white"
android:textSize="40sp" />
<TextView
android:id="@+id/search_person_email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/search_person_name"
android:layout_toEndOf="@+id/search_person_photo"
android:textColor="@color/colorPrimaryDark"
android:textSize="20sp" />
<TextView
android:id="@+id/search_person_username"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/search_person_email"
android:layout_toEndOf="@+id/search_person_photo"
android:textColor="@color/colorPrimaryDark"
android:textSize="20sp" />
<Button
android:id="@+id/addFriendButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_below="@+id/search_person_email"
android:layout_marginBottom="16dp"
android:background="@drawable/btn_default"
android:text="@string/addFriendButton"
android:textColor="@color/colorPrimary"/>
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
</pre></code>
Card.java
<pre><code>
public class Card {
public Card (String name, String email, String username) {
this.name = name;
this.email = email;
this.username = username;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail (String email) {
this.email = email;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
</pre></code>
**AddFriendActivity**
<pre><code>
public class AddFriendActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_addfriend);
db = new SQLiteHandler(getApplicationContext());
search = (EditText) findViewById(R.id.inputSearch);
pDialog = new ProgressDialog(this);
pDialog.setCancelable(false);
context = this;
searchButton = (Button) findViewById(R.id.searchButton);
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
title = "Add Friend";
getSupportActionBar().setTitle(title);
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
// Fetching current user details from sqlite
currentUser = db.getUserDetails();
currentUserUsername = currentUser.get("user_name").toString();
currentUserEmail = currentUser.get("email").toString();
searchButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
searchString = search.getText().toString();
searchUser(searchString);
}
});
}
private void searchUser(final String username) {
// Tag used to cancel the request
String tag_string_req = "req_search";
pDialog.setMessage("Searching User");
pDialog.show();
StringRequest strReq = new StringRequest(Request.Method.POST,
AppConfig.URL_SEARCH_USER, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, "Search Response: " + response.toString());
pDialog.hide();
try {
JSONObject jObj = new JSONObject(response);
boolean error = jObj.getBoolean("error");
// Check for error node in json
if (!error) {
//get User details from Json Response
JSONObject user = jObj.getJSONObject("user");
String JOBname = user.getString("name");
String JOBemail = user.getString("email");
String JOBusername = user.getString("user_name");
//add user details to cardView
List<Card> friendRequests = new ArrayList<Card>();
Card requestCard = new Card(JOBname, JOBemail, JOBusername);
friendRequests.add(requestCard);
//check if user isnt already a friend or our own self
friendshipExists(currentUserUsername, JOBusername);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
UnscrollableLayoutManager layoutManager = new UnscrollableLayoutManager
(AddFriendActivity.this);
recyclerView.setLayoutManager(layoutManager);
SearchCardAdapter adapter = new SearchCardAdapter(friendRequests,
currentUserUsername, AddFriendActivity.this, canAdd);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(adapter);
} else {
// Error in login. Get the error message
String errorMsg = jObj.getString("error_msg");
Log.i(TAG, errorMsg);
Toast.makeText(getApplicationContext(),
errorMsg, Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
// JSON error
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Json error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Search Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_LONG).show();
pDialog.hide();
}
}) {
@Override
protected Map<String, String> getParams() {
// Posting parameters to login url
Map<String, String> params = new HashMap<String, String>();
params.put("user_name", username);
return params;
}
};
// Adding request to request queue
AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
}
private void friendshipExists(final String currentUser, final String friendToAdd) {
String tag_string_req = "req_checkFriendship";
StringRequest strReq = new StringRequest(Request.Method.POST,
AppConfig.URL_CHECK_FRIENDSHIP, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jObj = new JSONObject(response);
boolean error = jObj.getBoolean("error");
Log.i(TAG, "Friendship response: " + String.valueOf(error));
if (error) {
canAdd = 0; //0 means we cannot add searched person, button shouldnt be visible
} else {
canAdd = 1; // we can add, button should be visible
}
} catch (JSONException e) {
// JSON error
e.printStackTrace();
Toast.makeText(context, "Json error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
Log.d(TAG, "Friendship Error: " + e.getMessage());
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Error: " + error.getMessage());
Toast.makeText(context,
error.getMessage(), Toast.LENGTH_LONG).show();
Log.i(TAG, "Friendship Error: " + error.getMessage());
}
}) {
@Override
protected Map<String, String> getParams() {
// Posting parameters to login url
Map<String, String> params = new HashMap<String, String>();
params.put("friend_one", currentUser);
params.put("friend_two", friendToAdd);
return params;
}
};
// Adding request to request queue
AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
}
}
</pre></code>
SearchCardAdapter
<pre><code>
public class SearchCardAdapter extends RecyclerView.Adapter<SearchCardAdapter.ViewHolder> {
public SearchCardAdapter(List<Card> searchResult, String currentUserUsername,
Context context, int canAdd) {
this.searchResult = searchResult;
this.context = context;
this.currentUserUsername = currentUserUsername;
this.canAdd = canAdd;
}
@Override
public SearchCardAdapter.ViewHolder onCreateViewHolder(final ViewGroup parent,
final int viewType) {
final View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.search_card_view,
parent, false);
final ViewHolder viewHolder = new ViewHolder(view);
pDialog = new ProgressDialog(parent.getContext());
pDialog.setCancelable(false);
return viewHolder;
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
holder.textViewName.setText(searchResult.get(position).getName());
holder.textViewEmail.setText(searchResult.get(position).getEmail());
holder.textViewUsername.setText(searchResult.get(position).getUsername());
friendToAddUsername = searchResult.get(position).getUsername();
if (canAdd == 0) {
sendRequestButton.setVisibility(View.INVISIBLE);
} else {
sendRequestButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sendRequest(currentUserUsername, friendToAddUsername);
}
});
}
}
@Override
public int getItemCount() {
return searchResult.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private TextView textViewName;
private TextView textViewEmail;
private TextView textViewUsername;
//private Button sendRequestButton;
private CardView cardView;
public ViewHolder(View itemView) {
super(itemView);
cardView = (CardView) itemView.findViewById(R.id.cv);
textViewName = (TextView) itemView.findViewById(R.id.search_person_name);
textViewEmail = (TextView) itemView.findViewById(R.id.search_person_email);
textViewUsername = (TextView) itemView.findViewById(R.id.search_person_username);
sendRequestButton = (Button) itemView.findViewById(R.id.addFriendButton);
}
}
private void sendRequest(final String currentUser, final String friendToAdd) {
String tag_string_req = "req_sendRequest";
final String status = "0";
pDialog.setMessage("Sending Friend Request");
pDialog.show();
StringRequest strReq = new StringRequest(Request.Method.POST,
AppConfig.URL_SEND_FRIEND_REQUEST, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, "Friend Request Response: " + response.toString());
pDialog.hide();
try {
JSONObject jObj = new JSONObject(response);
boolean error = jObj.getBoolean("error");
// Check for error node in json
if (!error) {
Toast.makeText(context,
"Friend request sent!", Toast.LENGTH_LONG).show();
} else {
// Error in login. Get the error message
String errorMsg = jObj.getString("error_msg");
Toast.makeText(context,
errorMsg, Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
// JSON error
e.printStackTrace();
Toast.makeText(context, "Json error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Friend Request Error: " + error.getMessage());
Toast.makeText(context,
error.getMessage(), Toast.LENGTH_LONG).show();
pDialog.hide();
}
}) {
@Override
protected Map<String, String> getParams() {
// Posting parameters to login url
Map<String, String> params = new HashMap<String, String>();
params.put("friend_one", currentUser);
params.put("friend_two", friendToAdd);
params.put("status", status);
return params;
}
};
// Adding request to request queue
AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
}
}
</pre></code>
答案 0 :(得分：0)
在按钮标记内添加以下行。
android:focusable="false"