我正在为大学献血项目构建一个应用程序，用户可以在其中使用Firebase身份验证电子邮件和密码进行注册，并可以发布对血液的请求，然后将其添加到Firebase数据库中，该信息显示在应用程序内的“回收”视图中 我能够完成那部分。
现在，我想添加一个按钮，该按钮将在回收视图中显示，并带有删除请求的选项，如果他希望他收到捐助者的来电或不再需要他的话。但是此按钮仅对已发布请求的用户可见，而对于回收适配器内的其他帮助发布将保持隐藏。
当他单击按钮时，它也应该从Firebase数据库中删除特定数据。
总结。 1.我需要仅对发布了帮助请求的用户可见的按钮，如果愿意，该按钮将删除该帖子
我正在使用Firebase身份验证输入电子邮件和密码。
这是Firebase数据库结构
此处是用户要上传帮助请求并添加到的代码 也可以火力扑灭数据
public class EnquiryActivity extends AppCompatActivity {
//UI
Button btnRequest;
EditText edtName,edtBlood,edtPlace,edtMobile,edtEmail;
//DB
DatabaseReference mHelper;
FirebaseAuth mAuth;
//progress
ProgressDialog mProgress;
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_enquiry);
//initialisation
edtBlood=(EditText)findViewById(R.id.enq_blood);
edtMobile=(EditText)findViewById(R.id.enq_mobile);
edtEmail=(EditText)findViewById(R.id.enq_email);
edtName=(EditText)findViewById(R.id.enq_name);
edtPlace=(EditText)findViewById(R.id.enq_place);
btnRequest=(Button)findViewById(R.id.button2);
//firebase
mHelper= FirebaseDatabase.getInstance().getReference();
final String mCurrentUser=FirebaseAuth.getInstance().getCurrentUser().getUid().toString();
mAuth=FirebaseAuth.getInstance();
//progress
mProgress=new ProgressDialog(this);
mProgress.setTitle("Loading");
mProgress.setMessage("Please wait..");
btnRequest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mProgress.show();
String blood=edtBlood.getText().toString();
String name=edtName.getText().toString();
String mobile=edtMobile.getText().toString();
String email=edtMobile.getText().toString();
String place=edtPlace.getText().toString();
String temp=blood.toUpperCase();
if(!TextUtils.isEmpty(blood)||!TextUtils.isEmpty(name)||!TextUtils.isEmpty(mobile)||
!TextUtils.isEmpty(place)){
HashMap<String, String> userMap = new HashMap<>();
userMap.put("name", name);
userMap.put("blood_group","Blood Group:- " + blood);
userMap.put("email", email);
userMap.put("mobile", mobile);
userMap.put("place","Location:- " + place);
mHelper.child("Help").child(mCurrentUser).setValue(userMap).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
mProgress.dismiss();
Toast.makeText(getApplicationContext(), "Registered Successfully..!", Toast.LENGTH_LONG).show();
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
});
}else{
Toast.makeText(getApplicationContext(),"Please enter the details in all fields",Toast.LENGTH_LONG).show();
}
}
});
}
}
此处是显示帮助帖子列表的代码，包括自己张贴的用户
* A simple {@link Fragment} subclass.
*/
public class NeedHelpFragment extends Fragment {
FloatingActionButton floatingActionButton;
private View mMainView;
private RecyclerView mHelpList;
private DatabaseReference mUsersDatabase;
private DatabaseReference mUsers;
private FirebaseAuth mAuth;
private String mCurrent_user_id;
public NeedHelpFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
mMainView = inflater.inflate(R.layout.fragment_need_help, container, false);
floatingActionButton = (FloatingActionButton) mMainView.findViewById(R.id.float_add);
floatingActionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(getActivity(), EnquiryActivity.class));
}
});
//init
mHelpList = (RecyclerView) mMainView.findViewById(R.id.need_recyclerview);
mAuth = FirebaseAuth.getInstance();
mUsersDatabase = FirebaseDatabase.getInstance().getReference().child("Help");
mUsers = FirebaseDatabase.getInstance().getReference().child("Users");
mCurrent_user_id = mAuth.getCurrentUser().getUid();
//
mHelpList.setHasFixedSize(true);
LinearLayoutManager linearVertical = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
mHelpList.setLayoutManager(linearVertical);
DividerItemDecoration mDividerItemDecoration = new DividerItemDecoration(
mHelpList.getContext(),
linearVertical.getOrientation()
);
mHelpList.addItemDecoration(mDividerItemDecoration);
return mMainView;
}
@Override
public void onStart() {
super.onStart();
FirebaseRecyclerAdapter<Help, HelpViewHolder> friendsRecyclerViewAdapter = new FirebaseRecyclerAdapter<Help, HelpViewHolder>(
Help.class,
R.layout.help_single_layout,
HelpViewHolder.class,
mUsersDatabase) {
@Override
protected void populateViewHolder(final HelpViewHolder helpViewHolder, Help help, int i) {
helpViewHolder.setDate(help.getDate());
final String list_user_id = getRef(i).getKey();
mUsersDatabase.child(list_user_id).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
final String userName = dataSnapshot.child("name").getValue().toString();
String blood = dataSnapshot.child("blood_group").getValue().toString();
final String phone = dataSnapshot.child("mobile").getValue().toString();
final String email = dataSnapshot.child("email").getValue().toString();
String address = dataSnapshot.child("place").getValue().toString();
helpViewHolder.setName(userName);
helpViewHolder.setBlood(blood);
helpViewHolder.setAddress(address);
helpViewHolder.setPhone(phone);
helpViewHolder.setEmail(email);
helpViewHolder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
CharSequence options[] = new CharSequence[]{"Email", "Call"};
final AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
builder.setTitle("Select Options");
builder.setItems(options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Click Event for each item.
if (i == 0) {
}
if (i == 1) {
String uri = phone;
if (ActivityCompat.checkSelfPermission(getActivity(), android.Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
}
}
}
});
builder.show();
}
});
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
};
mHelpList.setAdapter(friendsRecyclerViewAdapter);
}
// viewholder class..
public static class HelpViewHolder extends RecyclerView.ViewHolder {
View mView;
public HelpViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setBlood(String blood){
TextView userStatusView = (TextView) mView.findViewById(R.id.help_blood);
userStatusView.setText(blood.toUpperCase());
}
public void setName(String name){
TextView userNameView = (TextView) mView.findViewById(R.id.help_name);
userNameView.setText(name.toUpperCase());
}
public void setPhone(String phone){
TextView userNameView = (TextView) mView.findViewById(R.id.help_mobile);
userNameView.setText(phone);
}
public void setEmail(String name){
TextView userNameView = (TextView) mView.findViewById(R.id.help_email);
userNameView.setText(name.toUpperCase());
}
public void setAddress(String address) {
TextView userNameView = (TextView) mView.findViewById(R.id.help_place);
address.toUpperCase();
userNameView.setText(address.toUpperCase());
}
public void setDate(String date){
}
}
}
我们非常感谢您的帮助
谢谢。
答案 0 :(得分：0)
在 help_single_layout 中添加删除按钮。并在Firebase数据库中添加已发布的新密钥，以检查该用户是否已发布。在此基础上，您可以定义删除按钮的可见性。