我发布了一个关于将数据从活动传递到片段的问题。我已经了解到将Parcelable实现到POJO类是一种正确的方法。经过一些研究后我也明白，为了将数据传递给片段，应该使用Bundle而不是Intent。
我之前的问题 - ＆gt; Using same fragments but different content in Android
但现在，我的问题是，在点击cardview时，如何使用set方法显示详细信息列表（姓名，地址，电话）？
要清楚，我想要的是
当点击两个不同的餐厅cardview时，有人可以通过向我展示两组不同细节的代码来指导我吗？
我想在onClick下使用if else语句，以便在点击不同的cardview时显示不同的详细信息
public class RestaurantListAdapter extends RecyclerView.Adapter<RestaurantListAdapter.ViewHolder> {
List<RestaurantList_Item> items;
private static ClickListener clickListener;
private Context context;
public RestaurantListAdapter(){
super();
items = new ArrayList<RestaurantList_Item>();
// POSITION 1
RestaurantList_Item restaurant = new RestaurantList_Item();
restaurant.setrImage(R.mipmap.img_anjappar);
restaurant.setrName("Anjappar Indian Chettinad Restaurant");
restaurant.setrCuisine("Indian");
items.add(restaurant);
// POSITION 2
restaurant = new RestaurantList_Item();
restaurant.setrImage(R.mipmap.img_morganfield);
restaurant.setrName("Morganfield");
restaurant.setrCuisine("Western");
items.add(restaurant);
// POSITION 3
restaurant = new RestaurantList_Item();
restaurant.setrImage(R.mipmap.img_nandos);
restaurant.setrName("Nando's");
restaurant.setrCuisine("Western");
items.add(restaurant);
// POSITION 4
restaurant = new RestaurantList_Item();
restaurant.setrImage(R.mipmap.img_shellout);
restaurant.setrName("Shellout");
restaurant.setrCuisine("Seafood");
items.add(restaurant);
// POSITION 5
restaurant = new RestaurantList_Item();
restaurant.setrImage(R.mipmap.img_beyond);
restaurant.setrName("Beyond Veggie");
restaurant.setrCuisine("Vegetarian");
items.add(restaurant);
// POSITION 6
restaurant = new RestaurantList_Item();
restaurant.setrImage(R.mipmap.img_myelephant);
restaurant.setrName("My Elephant");
restaurant.setrCuisine("Thai");
items.add(restaurant);
// POSITION 7
restaurant = new RestaurantList_Item();
restaurant.setrImage(R.mipmap.img_padangkota);
restaurant.setrName("Nasi Kandar Padang Kota");
restaurant.setrCuisine("Mamak");
items.add(restaurant);
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View v = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.cardview_restaurant, viewGroup, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(final ViewHolder viewHolder, final int position) {
final RestaurantList_Item restaurant = items.get(position);
viewHolder.resImage.setImageResource(restaurant.getrImage());
viewHolder.restaurantName.setText(restaurant.getrName());
viewHolder.cuisine.setText(restaurant.getrCuisine());
viewHolder.itemView.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
Context context = v.getContext();
// Toast.makeText(context, "Item clicked with position " +position, Toast.LENGTH_LONG).show();
if(position == 0){
Intent i = new Intent(context, Restaurant.class);
context.startActivity(i);
}
}
});
}
@Override
public int getItemCount() {
return items.size();
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public ImageView resImage;
public TextView restaurantName;
public TextView cuisine;
public ViewHolder(final View itemView) {
super(itemView);
resImage = (ImageView) itemView.findViewById(R.id.resImage);
restaurantName = (TextView) itemView.findViewById(R.id.restaurantName);
cuisine = (TextView) itemView.findViewById(R.id.cuisine);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
clickListener.onItemClick(getAdapterPosition(), v);
}
}
public void setOnItemClickListener (ClickListener clickListener){
RestaurantListAdapter.clickListener = clickListener;
}
public interface ClickListener{
void onItemClick (int position, View v);
}
}
这是包含get set方法的POJO类，我想使用set方法显示餐厅详细信息
public class RestaurantModel implements Parcelable{
//empty constructor
public RestaurantModel(){}
//A constructor that initializes the Restaurant object
public RestaurantModel(String resName, String resAddress, String resPhone, String resCuisine, String resPriceRange){
this.resName = resName;
this.resAddress =resAddress;
this.resPhone = resPhone;
this.resCuisine = resCuisine;
this.resPriceRange = resPriceRange;
}
//Parcelling the object
public RestaurantModel(Parcel in){
String[] data = new String [5];
in.readStringArray(data);
this.resName = data[0];
this.resAddress = data[1];
this.resPhone = data[2];
this.resCuisine = data[3];
this.resPriceRange = data[4];
}
// variable main photo
private int mainImage;
//variables for details fragment
private String resName, resAddress, resPhone, resCuisine, resPriceRange;
//variables for menu fragment
private int foodPhoto;
private String foodPrice, foodDescription;
/*get set methods*/
public int getMainImage(){
return mainImage;
}
public void setMainImage(int mainImage){
this.mainImage = mainImage;
}
public String getResName(){
return resName;
}
public void setResName(String resName){
this.resName = resName;
}
public String getResAddress(){return resAddress;}
public void setResAddress(String resAddress){this.resAddress = resAddress;}
public String getResPhone(){return resPhone;}
public void setResPhone(String resPhone){this.resPhone = resPhone;}
public String getResCuisine(){return resCuisine;}
public void setResCuisine(String resCuisine){this.resCuisine = resCuisine;}
public String getResPriceRange(){return resPriceRange;}
public void setResPriceRange(String resPriceRange){this.resPriceRange = resPriceRange;}
public int getFoodPhoto(){return foodPhoto;}
public void setFoodPhoto(int foodPhoto){this.foodPhoto = foodPhoto;}
public String getFoodDescription(){return foodDescription;}
public void setFoodDescription(String foodDescription){this.foodDescription = foodDescription;}
public String getFoodPrice(){return foodPrice;}
public void setFoodPrice(String foodPrice){this.foodPrice = foodPrice;}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeStringArray(new String[]{
this.resName,this.resAddress,this.resPhone, this.resCuisine, this.resPriceRange
});
}
// Creator
public static final Parcelable.Creator<RestaurantModel> CREATOR = new Parcelable.Creator<RestaurantModel>(){
@Override
public RestaurantModel createFromParcel(Parcel source) {
return new RestaurantModel(source);
}
@Override
public RestaurantModel[] newArray(int size) {
return new RestaurantModel[size];
}
};
}
此活动包含点击cardview时将显示的片段
public class Restaurant extends AppCompatActivity {
private TabLayout tabLayout;
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_restaurant);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager){
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new details(), "Details");
adapter.addFragment(new menu(), "Menu");
adapter.addFragment(new tableBooking(), "Table booking");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter{
private final List<Fragment> fragmentList = new ArrayList<>();
private final List<String> fragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager){
super(manager);
}
@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
@Override
public int getCount() {
return fragmentList.size();
}
public void addFragment (Fragment fragment, String title){
fragmentList.add(fragment);
fragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return fragmentTitleList.get(position);
}
}
}
此类扩展包含餐馆详细信息的片段，例如姓名，地址和电话
public class details extends Fragment {
private TextView resName, resAddress, resPhone, resCuisine, resPriceRange;
public details() {
// Required empty public constructor
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/* resName = (TextView) getView().findViewById (R.id.resName);
resAddress = (TextView) getView().findViewById (R.id.resAddress);
resPhone = (TextView) getView().findViewById (R.id.resPhone);
resCuisine = (TextView) getView().findViewById (R.id.resCuisine);
resPriceRange = (TextView) getView().findViewById (R.id.resPriceRange);*/
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_details, container, false);
}
}
public class Homepage extends Activity {
RecyclerView recyclerView;
RecyclerView.LayoutManager llm;
RecyclerView.Adapter adapter;
private static final String TAG = Homepage.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//super.onCreateDrawer(R.layout.activity_homepage);
setContentView(R.layout.activity_homepage);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
llm = new LinearLayoutManager(Homepage.this);
recyclerView.setLayoutManager(llm);
adapter = new RestaurantListAdapter();
recyclerView.setAdapter(adapter);
}
}
编辑：我不确定我是否正确这样做。我创建了多个arraylist，描述了不同餐厅的不同细节。我把代码放在了RestaurantListAdapter中的onClick方法。
@Override
public void onBindViewHolder(final ViewHolder viewHolder, final int position) {
final RestaurantList_Item restaurant = items.get(position);
viewHolder.resImage.setImageResource(restaurant.getrImage());
viewHolder.restaurantName.setText(restaurant.getrName());
viewHolder.cuisine.setText(restaurant.getrCuisine());
viewHolder.itemView.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
Context context = v.getContext();
RestaurantModel rAnjappar = new RestaurantModel();
details fragment = new details();
Intent i = new Intent(context, Restaurant.class);
// Array List
ArrayList<RestaurantModel> a1 = new ArrayList<RestaurantModel>();
rAnjappar.setResName("Anjappar");
rAnjappar.setResAddress("Bandar Kinrara");
rAnjappar.setResPhone("03-80807362");
rAnjappar.setResCuisine("Mamak");
rAnjappar.setResPriceRange("RM 30 for 2 person");
ArrayList<RestaurantModel> a2 = new ArrayList<RestaurantModel>();
rAnjappar.setResName("Morganfield");
rAnjappar.setResAddress("Bandar Utama");
rAnjappar.setResPhone("03-80807362");
rAnjappar.setResCuisine("Western");
rAnjappar.setResPriceRange("RM 60 for 2 person");
// action when card view is clicked
if(position == 0){
Bundle b1 = new Bundle();
b1.putParcelableArrayList("anjappar", a1);
fragment.setArguments(b1);
context.startActivity(i);
}
}
});
}
如果这是可以接受的，我接下来要做的就是在我的片段代码中检索包吗？但由于我将有多个捆绑包，我应该如何以正确的方式检索所有捆绑包？
答案 0 :(得分：1)
您可以使用片段的setArguments()方法将您的餐厅模型类传递给新片段，同时创建它的新实例。您可以在新创建的片段{{1}中使用getArguments()将其取回}} 方法。您必须使您的resturantModel.java类可序列化。
onCreate()添加数据： -
public class RestaurantModel implements Serializable{
...
}
获取数据：
Bundle bundle = new Bundle();
bundle.putSerializable("restaurant", restaurant);
Fragment1 frag1 = new Fragment1();
frag1.setArguments(bundle);
FYI： Parcelable和Serializable之间的区别：https://stackoverflow.com/a/3323554/4690731
答案 1 :(得分：1)
好的，据我所知，你可以做以下事情
1在适配器
中添加此方法public RestaurantList_Item getItem(int pos) {
return items.get(pos);
}
<强> 2。主页是您的clicklistner活动（希望如此）
public void onItemClick(int position, view v) {
RestaurantList_Item row_object = adapter.getItem(position);
Intent i = new Intent(context, Restaurant.class);
i.putExtra(Common.Data_Object, row_object);
startActivity(i);
}
第3。替换餐厅类的代码
public class Restaurant extends AppCompatActivity {
private TabLayout tabLayout;
private ViewPager viewPager;
private RestaurantList_Item row_object;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_restaurant);
getIntentData(getIntent());
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
private void getIntentData(Intent i) {
if (i != null) {
row_object = i.getParcelableExtra(Common.Data_Object);
}
}
private void setupViewPager(ViewPager viewPager){
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
Fragment f = new details();
Bundle arguments = new Bundle();
arguments.putParcelable(Common.Data_Object, row_object);
f.setArguments(arguments);
adapter.addFragment(f, "Details");
adapter.addFragment(new menu(), "Menu");
adapter.addFragment(new tableBooking(), "Table booking");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter{
private final List<Fragment> fragmentList = new ArrayList<>();
private final List<String> fragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager){
super(manager);
}
@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
@Override
public int getCount() {
return fragmentList.size();
}
public void addFragment (Fragment fragment, String title){
fragmentList.add(fragment);
fragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return fragmentTitleList.get(position);
}
}
}
<强> 4。从详细信息片段中的包中获取对象
private void getIntentData(Bundle b)
{
if (b != null)
{
detailObject = b.getParcelable(Common.Data_Object);
}
}
希望它会有所帮助。