目的的Android - 火力地堡 - 从X节点检索数据并将其发送到节点Y
允许用户发送到当局报告。报告将被保存并在新的报告是由同一个用户输入
图片当前数据库不会被覆盖
在签订当前用户能够存储“事件报告”进入数据库,但显然当用户提交另一个“事件报告”时,新提交的“事件报告”将覆盖先前的“事件报告”的数据。
Desired数据库
的黄色突出显示数据应该是从“用户”子“名”,这是红色圆圈数据
例如检索到的数据,如果数据在红色圆圈数据是“安倍长”,黄色突出显示的数据也将是“安倍长”。
除此之外,当用户签署的当前提交“事件报告”时,每创建一个新的创建一个新的唯一密钥。这意味着它不会覆盖以前提交的数据。
报告片段类
import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import java.util.Date;
import java.util.HashMap;
public class ReportFragment extends Fragment {
private EditText jReportDatePick;
private EditText jReportTimeEnt;
private EditText jReportLocationEnt;
private EditText jReportDescriptionEnt;
private Button jReportSendBtn;
private FirebaseUser jReportCurrentUserID;
private DatabaseReference jReportByUserDatabase;
private ProgressDialog jReportLoad;
public ReportFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View viewRoot = inflater.inflate(R.layout.fragment_report, container, false);
jReportDatePick = viewRoot.findViewById(R.id.reportDatePick);
jReportTimeEnt = viewRoot.findViewById(R.id.reportTimeEnt);
jReportLocationEnt = viewRoot.findViewById(R.id.reportLocationEnt);
jReportDescriptionEnt = viewRoot.findViewById(R.id.reportDescriptionEnt);
jReportSendBtn = viewRoot.findViewById(R.id.reportSendBtn);
jReportLoad = new ProgressDialog(getActivity());
jReportSendBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String userReportDate = jReportDatePick.getText().toString();
String userReportTime = jReportTimeEnt.getText().toString();
String userReportLocation = jReportLocationEnt.getText().toString();
String userReportDescription = jReportDescriptionEnt.getText().toString();
if(!TextUtils.isEmpty(userReportDate)&&
!TextUtils.isEmpty(userReportTime)&&
!TextUtils.isEmpty(userReportLocation)&&
!TextUtils.isEmpty(userReportDescription)){
submitReport(userReportDate, userReportTime, userReportLocation, userReportDescription);
jReportLoad.setTitle("Sending Report");
jReportLoad.setMessage("Please wait while the report is being sent");
jReportLoad.setCanceledOnTouchOutside(false);
jReportLoad.show();
}else{
jReportLoad.dismiss();
Toast.makeText(getActivity(), "Report failed to be sent due to empty inputs", Toast.LENGTH_SHORT).show();
}
}
});
return viewRoot;
}
private void submitReport(final String userReportDate,final String userReportTime,
final String userReportLocation,final String userReportDescription) {
jReportCurrentUserID = FirebaseAuth.getInstance().getCurrentUser();
final String reportUserID = jReportCurrentUserID.getUid();
jReportByUserDatabase = FirebaseDatabase.getInstance().getReference().child("Incident Reports").child(reportUserID);
HashMap<String, String> incidentReportUser = new HashMap<>();
incidentReportUser.put("date", userReportDate);
incidentReportUser.put("time", userReportTime);
incidentReportUser.put("location", userReportLocation);
incidentReportUser.put("description", userReportDescription);
jReportByUserDatabase.setValue(incidentReportUser).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if(task.isSuccessful()){
jReportLoad.dismiss();
Toast.makeText(getActivity(), "Report was Sent", Toast.LENGTH_SHORT).show();
jReportDatePick.setText("");
jReportTimeEnt.setText("");
jReportLocationEnt.setText("");
jReportDescriptionEnt.setText("");
}else{
jReportLoad.dismiss();
Toast.makeText(getActivity(), "Report failed to be sent", Toast.LENGTH_SHORT).show();
}
}
});
}
}
附加评论
- 报告片段是如何工作的
我不打算为当前登录的用户能够提交他们的名字,这将创建一个宝用户将其他人的姓名输入到“事件报告”中。我打算检索“当前用户已登录”名称并自动将其输入到“事件报告”中。
- 如何报告片段编码
而不是把jReportByUserDatabase.setValue(incidentReportUser)
同时使用Map<String, Object>
我试图把.updateChildren
的。问题是,每个数据是下一个“唯一ID”,将“事故报告”下保存不进入数据树
解决方案中的问题
的帮助下由Cadet和JavaBanana编写
实现“For循环DataSnapshot”以遍历数据并检索所需的数据,同样使用“用户级”,其中包含了姓名,地址,状态等
private void submitReport(final String userReportDate,final String userReportTime,
final String userReportLocation,final String userReportDescription) {
DatabaseReference dbRef = FirebaseDatabase.getInstance().getReference();
dbRef.child("Users").addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
Users user = snapshot.getValue(Users.class);
HashMap<String, String> incidentReportUser = new HashMap<>();
incidentReportUser.put("name", user.name);
incidentReportUser.put("date", userReportDate);
incidentReportUser.put("time", userReportTime);
incidentReportUser.put("location", userReportLocation);
incidentReportUser.put("description", userReportDescription);
jReportCurrentUserID = FirebaseAuth.getInstance().getCurrentUser();
final String reportUserID = jReportCurrentUserID.getUid();
jReportByUserDatabase = FirebaseDatabase.getInstance().getReference().child("Incident Reports").child(reportUserID);
jReportByUserDatabase.push().setValue(incidentReportUser).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if(task.isSuccessful()){
jReportLoad.dismiss();
Toast.makeText(getActivity(), "Report was Sent", Toast.LENGTH_SHORT).show();
jReportDatePick.setText("");
jReportTimeEnt.setText("");
jReportLocationEnt.setText("");
jReportDescriptionEnt.setText("");
}else{
jReportLoad.dismiss();
Toast.makeText(getActivity(), "Report failed to be sent", Toast.LENGTH_SHORT).show();
}
}
});
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
谢谢你的回答!感谢您向我展示生成新密钥的方式:String reportId = dbRef.push()。getKey(); '但是如果我想从**红色圆圈**数据中检索“名称”怎么办? – Student
“用户”节点或“事件报告”节点中的用户名? – JavaBanana
“用户”节点中的用户名。当前数据库的**图片是我目前使用的图片**,我希望生成**图片的期望数据库**。用户的“姓名”不是由当前用户输入,而是当他/她提交“事件报告”时从当前用户检索到的 – Student