我正在尝试在回收视图中向我的卡片添加onclick监听器，目的是在我点击卡片时转到新的页面/活动。不幸的是，我对Java很新，但仍然不太懂。我看过许多类似的问题，但无法弄清楚如何使用它。 这是我的RecycleView适配器，它还包含View Holder。
public class JobListRecyclerAdapter extends RecyclerView.Adapter<JobListRecyclerAdapter.jobViewHolder> {
private ArrayList<JobClass> jobClassList;
public JobListRecyclerAdapter(ArrayList<JobClass> rList) {
this.jobClassList = rList;
}
@Override
public int getItemCount() {
if(jobClassList == null){return 0;}
return jobClassList.size();
}
@Override
public jobViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View itemView = LayoutInflater.
from(viewGroup.getContext()).
inflate(R.layout.job_list_card, viewGroup, false);
return new jobViewHolder(itemView);
}
@Override
public void onBindViewHolder(jobViewHolder jobViewHolder, int position) {
JobClass ci = jobClassList.get(position);
jobViewHolder.jName.setText("Name: "+ci.getmJobNum());
jobViewHolder.jDate.setText("Quantity: "+ci.getmJobDate());
}
public static class jobViewHolder extends RecyclerView.ViewHolder {
protected TextView jName;
protected TextView jDate;
public jobViewHolder(View j) {
super(j);
jName = (TextView) j.findViewById(R.id.job_name);
jDate = (TextView) j.findViewById(R.id.job_due_date);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mClickListener.onItemClick(v, getAdapterPosition());
}
});
}
private jobViewHolder.ClickListener mClickListener;
//Intreface to send callbacks
public interface ClickListener{
public void onItemClick(View view, int position);
}
public void setOnClickListener(jobViewHolder.ClickListener clicklistener){
mClickListener = clicklistener;
}
}
}
这是一个名为Job List的活动，它是一个片段，这就是为什么我找不到相关的例子。这是我的主要问题，我不知道如何实现视图，并在点击卡片时进行活动。
public class JobList extends Fragment {
public JobList() {
}
public static JobList newInstance() {
JobList fragment = new JobList();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_job_list, container, false);
final RecyclerView recyclerView = (RecyclerView)rootView.findViewById(R.id.job_list_recycler_view);
LinearLayoutManager llm = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(llm);
final ArrayList<JobClass> joblistclass = new ArrayList<>();
/*
// Create a new Adapter
final ArrayAdapter<String> adapter = new ArrayAdapter<>(getActivity(),
android.R.layout.simple_list_item_1, android.R.id.text1);
*/
// Get a reference to the todoItems child items it the database
//String userPath = ((GlobalData) getActivity().getApplication()).getUserPath() +"JOBS";
//final DatabaseReference myRef = database.getReference(userPath);
// final DatabaseReference myRef = FirebaseDatabase.getInstance().getReference("USERS/04950F4AE53F80/JOBS");
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference jobsRef = rootRef
.child("USERS")
.child("04950F4AE53F80")
.child("JOBS");
// Assign a listener to detect changes to the child items
// of the database reference.
// myRef.addValueEventListener(new ValueEventListener() {
ValueEventListener eventListener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot ds : dataSnapshot.getChildren()) {
String jobDate = ds.child("JOBOVERVIEW").child("jobDate").getValue(String.class);
JobClass jblst = ds.child("JOBOVERVIEW").getValue(JobClass.class);
joblistclass.add(jblst);
Log.d("TAG", jobDate);
}
final JobListRecyclerAdapter adapterb = new JobListRecyclerAdapter(joblistclass);
recyclerView.setAdapter(adapterb);
}
@Override
public void onCancelled(DatabaseError databaseError) {}
};
jobsRef.addListenerForSingleValueEvent(eventListener);
///to send to next page
Button nextPage = (Button) rootView.findViewById(R.id.addNewJob);
// Capture button clicks
nextPage.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Start NewActivity.class
Intent myIntent = new Intent(getContext(), JobForm.class);
startActivity(myIntent);
}
});
// go to job page when clicked
recyclerView.setOnItemClickListener(new View.OnClickListener{
@Override
public void onClick(AdapterView<?> adapter, View view, int position, long id) {
String name = (String) listView.getItemAtPosition(position);
((GlobalData) getActivity().getApplication()).setJobId(name);
// use -((GlobalData) getActivity().getApplication()).getJobId() to refer to the job id
Intent goToJob = new Intent(getContext(), Main2Activity.class);
startActivity(goToJob);
}
});
return rootView;
}
}
Main2Activity是我需要访问的页面。
public class Main2Activity extends AppCompatActivity {
private TextView mTextMessage;
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Fragment selectedFragment2 = null;
switch (item.getItemId()) {
case R.id.navigation2_home://maybe edit so that it goes back to first activity
selectedFragment2 = HomePage.newInstance();
break;
case R.id.navigation_overview:
selectedFragment2 = Overview.newInstance();
break;
case R.id.navigation_safety:
selectedFragment2 = Safety.newInstance();
break;
case R.id.navigation_quality:
selectedFragment2 = Quality.newInstance();
break;
case R.id.navigation_instruction:
selectedFragment2 = Instructions.newInstance();
break;
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.content2, selectedFragment2);
transaction.commit();
return true;
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation2);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
}
}
上述所有代码中的一切都没问题，我需要帮助Pleeeeeaaaase。
答案 0 :(得分：1)
在您的JobListRecyclerAdapter班级中，将其更改为：
public static class jobViewHolder extends RecyclerView.ViewHolder {
protected TextView jName;
protected TextView jDate;
protected CardView cardView;
public jobViewHolder(View j) {
super(j);
jName = (TextView) j.findViewById(R.id.job_name);
jDate = (TextView) j.findViewById(R.id.job_due_date);
cardView = (CardView) j.findViewById(R.id.your_card_view_id);
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Your Code Here
}
});
}
希望这会有所帮助。