安卓工作室:点击图片而不是整个项目

Question

我的应用程序中有一个RecyclerView，它显示了项目列表，现在我可以点击整个项目(图片+旁边的detalis(，并在一个新的活动中打开它。我正试图实现另一种情况——我只希望图像是"；可点击的"；而不是整个项目。这是我的ItemsActivity类，它实现了我的适配器(下一个类(：

public class ItemsActivity extends AppCompatActivity implements ImageAdapter.OnItemClickListener {
private int mDate, mMonth, mYear;
Date date2;
SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyy-MM-dd",java.util.Locale.getDefault());
private RecyclerView mRecyclerView;
private ImageAdapter mAdapter;
private FirebaseStorage mStorage;
private DatabaseReference mDatabaseRef;
private ValueEventListener mDBListener;
private List<Item> mItem;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_items);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mRecyclerView=findViewById(R.id.mRecyclerView);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mItem=new ArrayList<>();
mAdapter=new ImageAdapter(ItemsActivity.this,mItem);
mRecyclerView.setAdapter(mAdapter);
mAdapter.setOnItemClickListener(ItemsActivity.this);
mStorage=FirebaseStorage.getInstance();
mDatabaseRef= FirebaseDatabase.getInstance().getReference("Item");
mDBListener = mDatabaseRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
mItem.clear();
for(DataSnapshot postSnapshot: snapshot.getChildren()){
Item item = postSnapshot.getValue(Item.class);
item.setKey(postSnapshot.getKey());
mItem.add(item);
}
mAdapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
Toast.makeText(ItemsActivity.this, error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onItemClick(int position) {
Intent fullScreenIntent = new Intent(this,FullScreenActivity.class);
Item selecteditem=mItem.get(position);
if(selecteditem.getUri()!=null){
fullScreenIntent.setData(Uri.parse(selecteditem.getUri()));
startActivity(fullScreenIntent);
}
else{
Toast.makeText(ItemsActivity.this,"אין תמונה להצגה",Toast.LENGTH_SHORT).show();
}
}
@Override
public void onDeleteClick(int position){
Item selectedItem=mItem.get(position);
String selectedKey= selectedItem.getKey();
StorageReference imageref;
if(selectedItem.getUri()!=null){
imageref=mStorage.getReferenceFromUrl(selectedItem.getUri());
imageref.delete().addOnSuccessListener(aVoid -> {
mDatabaseRef.child(selectedKey).removeValue();
Toast.makeText(ItemsActivity.this, "פריט נמחק", Toast.LENGTH_SHORT).show();
});
}
else{
Toast.makeText(ItemsActivity.this, "פריט נמחק", Toast.LENGTH_SHORT).show();
mDatabaseRef.child(selectedKey).removeValue();
}
}
@Override
public void onUpdateClick(int position){
Item selecteditem=mItem.get(position);
final DialogPlus dialogPlus=DialogPlus.newDialog(ItemsActivity.this)
.setContentHolder(new ViewHolder(R.layout.dialogcontent))
.setExpanded(true,1300) // was 1200
.create();
View myview=dialogPlus.getHolderView();
EditText price=myview.findViewById(R.id.price);
EditText supp=myview.findViewById(R.id.usupplier);
EditText invoice=myview.findViewById(R.id.uinvoice);
EditText date=myview.findViewById(R.id.udatecreate);
EditText exgroup=myview.findViewById(R.id.uexpensegroup);
EditText extype=myview.findViewById(R.id.uexpensetype);
Button update=myview.findViewById(R.id.usubmit);
price.setText(String.valueOf(selecteditem.getPrice()));
supp.setText(selecteditem.getNameOfSupplier());
invoice.setText(selecteditem.getInvoiceNumber());
date.setText(selecteditem.getDateOfCreate());
date.setOnClickListener(view -> {
final Calendar Cal=Calendar.getInstance();
mDate=Cal.get(Calendar.DAY_OF_MONTH);
mMonth=Cal.get(Calendar.MONTH);
mYear=Cal.get(Calendar.YEAR);
DatePickerDialog datePickerDialog=new DatePickerDialog(ItemsActivity.this, (datePicker, year, month, dayOfMonth) -> {
Cal.set(year, month, dayOfMonth);
date.setText(simpleDateFormat.format(Cal.getTime()));
date2=Cal.getTime();
},mYear,mMonth,mDate);
datePickerDialog.getDatePicker().setMaxDate(System.currentTimeMillis()-1000);
datePickerDialog.show();
});
exgroup.setText(selecteditem.getExpenseGroup());
extype.setText(selecteditem.getExpenseType());
dialogPlus.show();
update.setOnClickListener(view -> {
Map<String,Object> map=new HashMap<>();
map.put("price",Double.parseDouble(price.getText().toString()));
map.put("nameOfSupplier",supp.getText().toString());
map.put("invoiceNumber",invoice.getText().toString());
map.put("dateOfCreate",date.getText().toString());
map.put("expenseGroup",exgroup.getText().toString());
map.put("expenseType",extype.getText().toString());
FirebaseDatabase.getInstance().getReference().child("Item")
.child(selecteditem.getKey()).updateChildren(map)
.addOnSuccessListener(unused -> dialogPlus.dismiss())
.addOnFailureListener(e -> dialogPlus.dismiss());
Toast.makeText(ItemsActivity.this, "נתוני פריט עודכנו", Toast.LENGTH_SHORT).show();
});
}
@Override
protected void onDestroy() {
super.onDestroy();
mDatabaseRef.removeEventListener(mDBListener);
}}

这是我的ImageAdapter类：

public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ImageViewHolder> {
private Context mContext;
private List<Item> mItems;
private OnItemClickListener mListener;
public ImageAdapter(Context context, List<Item> items){
mContext=context;
mItems=items;
}
@NonNull
@Override
public ImageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v= LayoutInflater.from(mContext).inflate(R.layout.row_item,parent,false);
return new ImageViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull ImageViewHolder holder, int position) {
Item current = mItems.get(position);
//holder.ViewDate.setText(changeDateFormat(current.getDateOfCreate()));
holder.ViewDate.setText(current.getDateOfCreate());
holder.ViewInvoice.setText(current.getInvoiceNumber());
holder.ViewPrice.setText("₪"+String.valueOf(current.getPrice()));
Glide.with(this.mContext)
.load(current.getUri())
.placeholder(R.drawable.unnamed)
.error(R.drawable.unnamed)
.fitCenter()
.centerCrop()
.into(holder.imageView);
}
@Override
public int getItemCount() {
return mItems.size();
}
public class ImageViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener,
View.OnCreateContextMenuListener, MenuItem.OnMenuItemClickListener {
public TextView ViewDate;
public TextView ViewInvoice;
public TextView ViewPrice;
public ImageView imageView;
public ImageViewHolder(@NonNull View itemView) {
super(itemView);
ViewDate = itemView.findViewById(R.id.DateTextView);
ViewPrice = itemView.findViewById(R.id.PriceTextView);
ViewInvoice=itemView.findViewById(R.id.InvoiceTextView);
imageView=itemView.findViewById(R.id.ItemImageView);
itemView.setOnClickListener(this);
itemView.setOnCreateContextMenuListener(this);
}
@Override
public void onClick(View view) {
if(mListener!=null){
int position=getAdapterPosition();
if(position!=RecyclerView.NO_POSITION){
mListener.onItemClick(position);
}
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo contextMenuInfo) {
menu.setHeaderTitle("בחר פעולה");
MenuItem delete=menu.add(Menu.NONE,1,1,"מחק");
MenuItem update=menu.add(Menu.NONE,2,2,"עדכן נתוני פריט");
delete.setOnMenuItemClickListener(this);
update.setOnMenuItemClickListener(this);
}
@Override
public boolean onMenuItemClick(MenuItem item) {
if(mListener!=null){
int position=getAdapterPosition();
if(position!=RecyclerView.NO_POSITION){
switch (item.getItemId()){
case 1:
mListener.onDeleteClick(position);
return true;
case 2:
mListener.onUpdateClick(position);
return true;
}
}
}
return false;
}
}
public interface OnItemClickListener{
void onItemClick(int position);
void onDeleteClick(int position);
void onUpdateClick(int position);
}
public void setOnItemClickListener(OnItemClickListener listener){
mListener=listener;
}}

谢谢！

Answer 1

假设您想在单击imageView时触发回调，在此行之后：imageView=itemView.findViewById(R.id.ItemImageView(；添加以下内容：

imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//startActivity(intent);
}
});

Answer 2

我不经常看到这种情况，但Fragment观察到的Adapter中可能有LiveData对象。

然后你就可以拥有"；命令"；其与所接收的CCD_ 4配对。

@Retention(RetentionPolicy.SOURCE)
@IntDef({
ImageCommand.DELETE,
ImageCommand.UPDATE,
ImageCommand.DETAILS,
ImageCommand.IMAGE,
})
public @interface ImageCommand {
int DELETE = 1;
int UPDATE = 2;
int DETAILS = 3;
int IMAGE = 4;
}

适配器内部

public MutableLiveData<Pair<Integer,Item>> commandPair = new MutableLiveData<>();
//When you need to delete the image
commandPair.setValue(new Pair<Integer,Item>(ImageCommand.DELETE,mItems.get(position)))
//When you need to update the image
commandPair.setValue(new Pair<Integer,Item>(ImageCommand.UPDATE ,mItems.get(position)))
//When you need to do something when the details is clicked
commandPair.setValue(new Pair<Integer,Item>(ImageCommand.DETAILS,mItems.get(position)))
//When you need to do something when the image is clicked
commandPair.setValue(new Pair<Integer,Item>(ImageCommand.IMAGE,mItems.get(position)))

片段/活动内部

adapter.commandPair.observe(getLifecycleOwner(),(command)->{
if(command == null)
return;
switch(command.first){
case ImageCommand.DELETE:
//Delete the image
//-> Image is here command.second;
break;
case ImageCommand.UPDATE:
//Update the image
//-> Image is here command.second;
break;
case ImageCommand.DETAILS:
//User click the image details.
//-> Image is here command.second;
break;
case ImageCommand.IMAGE:
//User click the image itself.
//-> Image is here command.second;
break;
}

});