我正在尝试在RecyclerView中显示数据。我已经创建了一个适配器来处理来自不同活动的RecyclerView。我面临的问题是适当地显示数据。到目前为止，我只能显示列表中的最后一个元素。在这种情况下，每个ContestedOffice的最后一个候选人。我已经为活动和适配器附加了我的代码以及输出的屏幕截图。
我的适配器类
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final String LOGCAT = RecyclerAdapter.class.getSimpleName();
private static final int VIEW_TYPE_VOTE = 0;
private static final int VIEW_TYPE_PREVIEW = 1;
private List candidatesList;
private LinearLayout checkBoxParent;
private VoteActivity voteActivity;
private Context context;
public RecyclerAdapter(List candidatesList) //Generic List
{
this.candidatesList = candidatesList;
}
@Override
public int getItemViewType(int position) {
if (candidatesList.get(position) instanceof Candidate) {
return VIEW_TYPE_PREVIEW;
} else {
return VIEW_TYPE_VOTE;
}
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
context = parent.getContext();
if (viewType == VIEW_TYPE_PREVIEW) {
View preview = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_candidate_recycler, parent, false);
return new CandidateViewHolder(preview); // view holder for candidates items
} else if (viewType == VIEW_TYPE_VOTE) {
View ballot = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_ballot_view, parent, false); //false too
return new BallotViewHolder(ballot); // view holder for ContestedOffice items
}
return null;
}
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
final int itemType = getItemViewType(position);
if (itemType == VIEW_TYPE_PREVIEW) {
CandidateViewHolder.class.cast(holder).bindData((Candidate)
candidatesList.get(position));
} else if (itemType == VIEW_TYPE_VOTE) {
BallotViewHolder.class.cast(holder).bindData((ContestedOffice)
candidatesList.get(position));
}
}
@Override
public int getItemCount() {
Log.d(LOGCAT, " Size: " + candidatesList.size());
return candidatesList.size();
}
/**
* ViewHolder class
*/
private class BallotViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private AppCompatTextView vote_candidate_name;
private AppCompatTextView vote_candidate_details;
private AppCompatTextView vote_candidate_party;
BallotViewHolder(View view) {
super(view);
checkBoxParent = (LinearLayout) view.findViewById(R.id.checkbox_layout_parent);
vote_candidate_name = (AppCompatTextView) view.findViewById(R.id.vote_candidate_name)
vote_candidate_party = (AppCompatTextView) view.findViewById(R.id.vote_candidate_party);
vote_candidate_details = (AppCompatTextView) view.findViewById(R.id.vote_candidate_details);
}
void bindData(ContestedOffice candidate)
{
int length = candidate.getList().size();
Log.d(LOGCAT, "BallotList size:" + length);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
RecyclerView.LayoutParams.WRAP_CONTENT, RecyclerView.LayoutParams.WRAP_CONTENT);
//params.setMargins(10, 10, 10, 10);
params.gravity = Gravity.END;
CheckBox checkBox = null;
for (int i = 0; i < length; i++)
{
vote_candidate_name.setText(candidate.getList().get(i).getCandidateName());
vote_candidate_party.setText(candidate.getList().get(i).getParty());
vote_candidate_details.setText(candidate.getList().get(i).getDetails());
//Create checkboxes for each recycler view created
checkBox = new CheckBox(context);
checkBox.setTag(candidate.getList().get(i).getCandidateID());
checkBox.setId(candidate.getList().get(i).getCandidateID());
//checkBox.setText(R.string.checkBox_message);
checkBox.setText(String.valueOf(candidate.getList().get(i).getCandidateID()));
checkBox.setBackgroundColor(Color.RED);
Log.d(LOGCAT, "TAGS: " + checkBox.getTag() + " id: " + checkBox.getId());
}
if (checkBox != null) {
checkBox.setOnClickListener(this);
}
checkBoxParent.addView(checkBox, params);
}
@Override
public void onClick(View v) {
// Is the view now checked?
boolean checked = ((CheckBox) v).isChecked();
// Check which checkbox was clicked
switch (v.getId()) {
case 31:
if (checked) {
Log.d(LOGCAT, "Here:" + v.getTag().toString());
} else
break;
case 30:
if (checked) {
Log.d(LOGCAT, "Here:" + v.getTag().toString());
} else
break;
}
}
}
/**
* ViewHolder class
*/
private class CandidateViewHolder extends RecyclerView.ViewHolder {
private AppCompatTextView candidate_name;
private AppCompatTextView candidate_details;
private AppCompatTextView candidate_party;
private AppCompatTextView candidate_position;
// private AppCompatImageView candidate_image;
CandidateViewHolder(View view) {
super(view);
candidate_name = (AppCompatTextView) view.findViewById(R.id.candidate_name);
// candidate_image = (AppCompatImageView) view.findViewById(R.id.candidate_image);
candidate_position = (AppCompatTextView) view.findViewById(R.id.candidate_position);
candidate_party = (AppCompatTextView) view.findViewById(R.id.candidate_party);
candidate_details = (AppCompatTextView) view.findViewById(R.id.candidate_details);
}
void bindData(Candidate candidate)//Candidate
{
candidate_name.setText(candidate.getCandidateName());
candidate_position.setText(candidate.getPosition());
candidate_details.setText(candidate.getDetails());
candidate_party.setText(candidate.getParty());
// candidate_image.setImageBitmap(candidate.getCandidatePhoto());
}
}
}
我的VoteActivity Class
public class VoteActivity extends AppCompatActivity implements View.OnClickListener
{
private static final String LOGCAT = VoteActivity.class.getSimpleName();
private AppCompatActivity activity = VoteActivity.this;
private RecyclerView vote_recycler_view;
private LinearLayout checkBoxParent;
private CheckBox vote_candidate_checkBox;
private AppCompatButton appCompatButtonVote;
private RecyclerAdapter recyclerAdapter;
RecyclerView.LayoutManager layoutManager;
private Ballot ballot;
private List <ContestedOffice> ballotList = new ArrayList<>();
private List<Candidate> candidateList = new ArrayList<>();
private DatabaseHelper databaseHelper;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_vote);
getSupportActionBar().setTitle("");
initViews();
initObjects();
initListeners();
}
private void initListeners()
{
appCompatButtonVote.setOnClickListener(this);
}
private void initObjects()
{
recyclerAdapter = new RecyclerAdapter(ballotList);
databaseHelper = new DatabaseHelper(this);
layoutManager = new LinearLayoutManager(activity);
vote_recycler_view.setLayoutManager(layoutManager);
vote_recycler_view.setItemAnimator(new DefaultItemAnimator());
vote_recycler_view.setHasFixedSize(true);
vote_recycler_view.setAdapter(recyclerAdapter);
getCandidates();
}
private void getCandidates()
{
new AsyncTask<Void, Void, Void>()
{
@Override
protected Void doInBackground(Void... params)
{
ballotList.clear();
candidateList.clear();
candidateList.addAll(databaseHelper.getAllCandidates());
createBallot();
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
recyclerAdapter.notifyDataSetChanged();
}
}.execute();
}
private void initViews()
{
checkBoxParent = (LinearLayout) findViewById(R.id.checkbox_layout_parent);
vote_recycler_view = (RecyclerView) findViewById(R.id.vote_recycler_view);
//vote_candidate_checkBox = (CheckBox) findViewById(R.id.vote_candidate_checkBox);
appCompatButtonVote = (AppCompatButton) findViewById(R.id.appCompatButtonVote);
}
public List<ContestedOffice> createBallot()
{
int candidateListSize = candidateList.size();
String position;
ArrayList<String> positionArray = new ArrayList<>();
ContestedOffice office;
//Looping through the candidates list and add all the positions being contested for
// to an array list.
for (int i = 0; i< candidateListSize; i++)
{
position = candidateList.get(i).getPosition();
positionArray.add(position);
}
//Create a set to remove all duplicate positions
Set<String> noDuplicates = new HashSet<>();
noDuplicates.addAll(positionArray);
positionArray.clear();
positionArray.addAll(noDuplicates);
Log.d(LOGCAT, "Contested Offices and Candidates: " + positionArray.size() + " "+ candidateListSize);
//Create the Contested Office according to the size of the position array
//and make sure the names are added.
int noOfContestedOffice = positionArray.size();
for(int i = 0; i<noOfContestedOffice; i++)
{
office = new ContestedOffice(positionArray.get(i));
Log.d(LOGCAT, "New Contested Office Created:" + office.getName());
Candidate c = new Candidate();
for(int j = 0; j < candidateListSize; j++)
{
//All the Seats/Position being Contested For
String candidatePosition = candidateList.get(j).getPosition();
String contestedOfficeName = office.getName();
if(candidatePosition.equals(contestedOfficeName)) {
c = candidateList.get(j);
//Add the candidate to the Contested Office
office.add(c);
}
Log.d(LOGCAT, "Added Candidate: "+ candidateList.get(j) +" to: "+ office.getName());
}
//Add offices to ballot and ballot List
ballot = new Ballot();
ballot.add(office);
//Ideally Ballot into BallotList
ballotList.add(office);
Log.d(LOGCAT, "Office definitely added to ballotList: " + ballotList.size());
}
return ballotList;
}
}
我的VoteActivity XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:background="@color/colorBackground"
android:orientation="vertical"
tools:context=".activities.VoteActivity">
<android.support.v7.widget.LinearLayoutCompat
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="@color/colorPrimary"
android:gravity="center"
android:orientation="vertical">
<android.support.v7.widget.AppCompatTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/dashboard_vote_message"
android:textAlignment="center"
android:textSize="20sp" />
<android.support.v7.widget.AppCompatTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:textAlignment="center"
android:id="@+id/vote_message_placeholder"
android:text="@string/vote_message" />
</android.support.v7.widget.LinearLayoutCompat>
<include layout="@layout/fragment_ballot_layout"/>
<include layout="@layout/footer_vote_button" />
</LinearLayout>
RecyclerView XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="@+id/recycler_layout_parent"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_marginTop="5dp">
<android.support.v7.widget.RecyclerView
android:layout_weight="1"
android:id="@+id/vote_recycler_view"
android:layout_width="match_parent"
android:layout_height="0dp"/>
</LinearLayout>
</LinearLayout>
CardView XML
<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
xmlns:tools="http://schemas.android.com/tools"
card_view:cardCornerRadius="4dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:orientation="horizontal">
<android.support.v7.widget.AppCompatImageView
android:id="@+id/vote_candidate_image"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_gravity="center_vertical"
android:fontFamily="sans-serif-medium"
android:gravity="center"
android:src = "@drawable/btn_ballot"
android:textColor="@android:color/white"
android:textSize="16sp"
tools:text="8.9"
android:contentDescription="@string/candidate_photo" />
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_weight="1"
android:orientation="vertical">
<android.support.v7.widget.AppCompatTextView
android:id="@+id/vote_candidate_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:fontFamily="sans-serif-medium"
android:maxLines="1"
android:textAllCaps="true"
android:textColor="@color/textColorCandidateName"
android:textSize="12sp"
tools:text="CANDIDATE NAME" />
<android.support.v7.widget.AppCompatTextView
android:id="@+id/vote_candidate_party"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/textColorPartyDetails"
android:textSize="12sp"
android:ellipsize="end"
tools:text="PARTY NAME" />
<android.support.v7.widget.AppCompatTextView
android:id="@+id/vote_candidate_details"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:maxLines="2"
android:textColor="@color/textColorDetails"
android:textSize="16sp"
tools:text="Long placeholder for candidate details. 2 Lines Max" />
</LinearLayout>
<LinearLayout
android:id="@+id/checkbox_layout_parent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:orientation="vertical">
<!--Dynamic Checkboxes here-->
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
答案 0 :(得分：0)
我认为你每次都在创建候选人的对象，因为它会解决你的问题，它会解决你的问题
Candidate c = new Candidate();
ballot = new Ballot();
for(int i = 0; i<noOfContestedOffice; i++)
{
office = new ContestedOffice(positionArray.get(i));
Log.d(LOGCAT, "New Contested Office Created:" + office.getName());
for(int j = 0; j < candidateListSize; j++)
{
//All the Seats/Position being Contested For
String candidatePosition = candidateList.get(j).getPosition();
String contestedOfficeName = office.getName();
if(candidatePosition.equals(contestedOfficeName)) {
c = candidateList.get(j);
//Add the candidate to the Contested Office
office.add(c);
}
Log.d(LOGCAT, "Added Candidate: "+ candidateList.get(j) +" to: "+ office.getName());
}
//Add offices to ballot and ballot List
ballot.add(office);
//Ideally Ballot into BallotList
ballotList.add(office);
Log.d(LOGCAT, "Office definitely added to ballotList: " + ballotList.size());
}
只需检查一次即可解决问题。
我在
下面更新了xml <android.support.v7.widget.RecyclerView
android:layout_weight="1"
android:id="@+id/vote_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
检查一下Recyclerview的高度。