recyclelerview，单击突出显示并使其他人不突出显示
我有信用卡的回收视图，如果你点击一个，我希望它改变那个的背景资源，并使所有其他的恢复到默认，由于某种原因，我已经打了大约5个小时，不能正确。
这是失败的班级
public class CheckOutCardRecycler extends RecyclerView.Adapter<CheckOutCardRecycler.CardViewHolder>{
private List<Card> checkOutCard;
private int screenWidth;
private int selected;
public CheckOutCardRecycler(Activity activity, List<Card> checkOutCard){
Display display = activity.getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
this.screenWidth = size.x;
this.checkOutCard = checkOutCard;
selected=-1;
}
public static class CardViewHolder extends RecyclerView.ViewHolder {
CardView card;
LinearLayout row;
static TextView etCardNumber;
static TextView etName;
static TextView etDate;
static LinearLayout creditCard;
CardViewHolder(View itemView) {
super(itemView);
card = (CardView)itemView.findViewById(R.id.card_view);
etCardNumber = (TextView)itemView.findViewById(R.id.etCardNumber);
etName = (TextView)itemView.findViewById(R.id.etName);
etDate = (TextView)itemView.findViewById(R.id.etDate);
creditCard = (LinearLayout) itemView.findViewById(R.id.creditCard);
}
}
@Override
public int getItemCount() {
return checkOutCard.size();
}
public int getSelected() {
return selected;
}
public int getPaymentMethod(int i) {
return Integer.parseInt(checkOutCard.get(i).getId());
}
@Override
public CardViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row_checkout_cards, viewGroup, false);
CardViewHolder pvh = new CardViewHolder(v);
return pvh;
}
@Override
public void onBindViewHolder(final CardViewHolder cardViewHolder, final int i) {
CardViewHolder.etCardNumber.setText("**** **** **** " + checkOutCard.get(i).getLast_four_digits());
CardViewHolder.etName.setText(checkOutCard.get(i).getName());
CardViewHolder.etDate.setText(checkOutCard.get(i).getExpiry_month() +"/"+checkOutCard.get(i).getExpiry_year().substring(2,4));
if (selected<0)
if (checkOutCard.get(i).getDefaultcard()==1){
selected=i;
}
CardViewHolder.creditCard.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
if (i!=selected) {
checkOutCard.get(selected).setDefaultcard(0);
checkOutCard.get(i).setDefaultcard(1);
selected=-1;
notifyDataSetChanged();
}
}
});
if (selected==i){
if (checkOutCard.get(i).getBrand().toLowerCase().equals("visa"))
CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreenvisaselected);
else if (checkOutCard.get(i).getBrand().toLowerCase().equals("mastercard"))
CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreenmastercardselected);
else
CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreenselected);
}
else {
if (checkOutCard.get(i).getBrand().toLowerCase().equals("visa"))
CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreenvisa);
else if (checkOutCard.get(i).getBrand().toLowerCase().equals("mastercard"))
CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreenmastercard);
else
CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreen);
}
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
}
3 个答案:
答案 0 :(得分：1)
你的适配器应该看起来像这样：
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.CardViewHolder> {
private Context context;
private List<Card> checkOutCard;
private int screenWidth; // I really think you shouldn't calculate your width in the adapter but before your create it.
private Card selected;
public CardAdapter(Context context, List<Card> checkOutCard, int screenWidth) {
this.context = context;
this.screenWidth = screenWidth;
this.checkOutCard = checkOutCard;
}
protected Context getContext() {
return context;
}
protected Card getItem(int position){
}
public Card getSelected() {
return selected;
}
public void setSelected(Card selected) {
this.selected = selected;
}
@Override
public CardViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new CardViewHolder(LayoutInflater.from(getContext()).inflate(R.layout.row_checkout_cards, parent, false));
}
@Override
public void onBindViewHolder(CardViewHolder holder, int position) {
Card currentCard = getItem(position);
holder.bind(currentCard, currentCard == selected);
}
@Override
public int getItemCount() {
return 0;
}
public static class CardViewHolder extends RecyclerView.ViewHolder {
CardView card;
LinearLayout row;
static TextView etCardNumber;
static TextView etName;
static TextView etDate;
static LinearLayout creditCard;
CardViewHolder(View itemView) {
super(itemView);
card = (CardView)itemView.findViewById(R.id.card_view);
etCardNumber = (TextView)itemView.findViewById(R.id.etCardNumber);
etName = (TextView)itemView.findViewById(R.id.etName);
etDate = (TextView)itemView.findViewById(R.id.etDate);
creditCard = (LinearLayout) itemView.findViewById(R.id.creditCard);
}
public void bind(Card card, boolean isSelected){
etCardNumber.setText("**** **** **** " + card.getLast_four_digits());
etName.setText(card.getName());
etDate.setText(card.getExpiry_month() +"/"+card.getExpiry_year().substring(2,4));
if (isSelected)
if (card.getDefaultcard()==1){
selected=i;
}
creditCard.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
if (i!=selected) {
checkOutCard.get(selected).setDefaultcard(0);
card.setDefaultcard(1);
selected=-1;
notifyDataSetChanged();
}
}
});
if (selected==i){
if (card.getBrand().toLowerCase().equals("visa"))
creditCard.setBackgroundResource(R.drawable.paymentscreenvisaselected);
else if (card.getBrand().toLowerCase().equals("mastercard"))
creditCard.setBackgroundResource(R.drawable.paymentscreenmastercardselected);
else
creditCard.setBackgroundResource(R.drawable.paymentscreenselected);
}
else {
if (card.getBrand().toLowerCase().equals("visa"))
creditCard.setBackgroundResource(R.drawable.paymentscreenvisa);
else if (card.getBrand().toLowerCase().equals("mastercard"))
creditCard.setBackgroundResource(R.drawable.paymentscreenmastercard);
else
creditCard.setBackgroundResource(R.drawable.paymentscreen);
}
}
}
}
答案 1 :(得分：1)
这是一个有效的例子：
适配器：
public class TestAdapter extends RecyclerView.Adapter<TestAdapter.TestViewHolder> {
private List<String> mData;
Context mContext;
RecyclerView mRecyclerView;
public class TestViewHolder extends RecyclerView.ViewHolder{
LinearLayout mListItemLayout;
TextView mTextView;
int mPosition;
public TestViewHolder(final View itemView) {
super(itemView);
mListItemLayout = (LinearLayout) itemView.findViewById(R.id.list_item);
mTextView = (TextView) itemView.findViewById(R.id.list_item_text);
mListItemLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
itemView.setBackgroundColor(Color.RED);
grayBackgroundOfOtherItems();
}
});
}
public void setPosition(int position){
mPosition = position;
}
private void grayBackgroundOfOtherItems(){
int size = mData.size();
for(int i=0; i<size; i++){
if(i != mPosition){
TestViewHolder viewHolder = (TestViewHolder) mRecyclerView.findViewHolderForAdapterPosition(i);
((TestViewHolder) mRecyclerView.findViewHolderForAdapterPosition(i)).
mListItemLayout.setBackgroundColor(Color.LTGRAY);
}
}
}
}
public TestAdapter(Context context, RecyclerView recyclerView){
this.mContext = context;
this.mRecyclerView = recyclerView;
initData();
}
private void initData(){
mData = new ArrayList<String>();
mData.add("Africa");
mData.add("Antartica");
mData.add("Asia");
mData.add("Australia");
mData.add("Europe");
mData.add("North America");
mData.add("South America");
}
@Override
public TestViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item, parent, false);
TestViewHolder viewHolder = new TestViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(TestViewHolder holder, int position) {
holder.mTextView.setText(mData.get(position));
holder.setPosition(position);
}
@Override
public int getItemCount() {
return mData.size();
}
}
活动：
public class CardViewActivity extends AppCompatActivity{
RecyclerView mRecyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_card_view);
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.setAdapter(new TestAdapter(this,mRecyclerView));
}
}
活动的布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".stack_overflow_cardview.CardViewActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
每个列表项的布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id = "@+id/list_item"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dp">
<TextView
android:id = "@+id/list_item_text"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content" />
</LinearLayout>
截图：
希望这很有用。
编辑：如果您不熟悉在您的适配器中引用它的ReclerView，您可以使用您的活动/片段必须实现的接口并将该位置传递给接口方法。
答案 2 :(得分：-1)
感谢大家的回答，最后几天尝试了所有的解决方案，但没有一个工作，也没有解决为什么我最终想出来，我有一个愚蠢的语法问题，让我头疼。
我所要做的就是在onBindViewHolder里面我必须将所有的CardViewHolder更改为cardViewHolder。我想这使得这个问题对其他人来说毫无意义，所以我的虔诚和再次感谢所有其他人做出长篇答案的努力
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