将Firebase数据传输到Spinner [英] Firebase data to Spinner
本文介绍了将Firebase数据传输到Spinner的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
尝试访问的数据 Firebase数据库屏幕截图
我正在尝试将所有值存储到微调器中，但是似乎使用arraylist和许多其他函数甚至没有多大帮助.因此，我只是添加了没有微调器的代码. 最终结果应该是在微调器中显示所有值.
I'm trying to store all the values to a spinner but it seems like using arraylist and many other functions aren't even helping much. So, I'm just adding the code without spinner. Final result should be to show all values in a spinner.
SymptomActivity.java
package com.example.nishantsikri.microdoctor;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class SymptomActivity extends AppCompatActivity {
private DatabaseReference mFirebaseDatabase, spinnerDatabase;
private FirebaseDatabase mFirebaseInstance;
Button button;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_symptom);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
button = (Button) findViewById(R.id.button8);
textView = (TextView) findViewById(R.id.textView2);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
FirebaseDatabase.getInstance().setPersistenceEnabled(true);
// Write a message to the database
mFirebaseInstance = FirebaseDatabase.getInstance();
// store app title to 'app_title' node
mFirebaseInstance.getReference("app_title").setValue("microDoctor");
mFirebaseDatabase = mFirebaseInstance.getReference("symptomList");
spinnerDatabase = mFirebaseInstance.getReference("symptomView");
//mFirebaseDatabase.child("Headache").child("Some Value").setValue("Head");
//mFirebaseDatabase.setValue("Headache");
spinnerData();
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
}
private void readDataListener() {
mFirebaseDatabase.child("Abdominal Cramps").child("Diarrhea").child("Vomiting").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Symptom symptom = dataSnapshot.getValue(Symptom.class);
// Check for null
if (symptom == null) {
Log.e("Data", "Symptom data is null!");
return;
}
Log.e("Symptom Data", "User data is changed!"+symptom.getDisease());
// Display newly updated name and email
textView.setText(symptom.symptom1+"\n"+symptom.symptom2+"\n"+symptom.symptom3+"\n"+symptom.disease+"\n"+dataSnapshot.getKey());
}
@Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.e("Error", "Failed to read user", error.toException());
}
});
}
private void spinnerData() {
spinnerDatabase.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Log.e("Spinner Data", "Spinner data is changed!");
ArrayList<String> list = new ArrayList<>();
list.add(dataSnapshot.getValue().toString());
for (String lists : list){
Log.d("ddd","Array List: "+dataSnapshot.getValue().toString());
textView.setText(lists);
}
}
@Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.e("Error", "Failed to read user", error.toException());
}
});
}
}
content_symptom.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.nishantsikri.microdoctor.SymptomActivity"
tools:showIn="@layout/activity_symptom">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/button8"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button"
tools:layout_editor_absoluteX="70dp"
tools:layout_editor_absoluteY="16dp" />
<TextView
android:id="@+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView"
tools:layout_editor_absoluteX="127dp"
tools:layout_editor_absoluteY="170dp" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
推荐答案
您可以通过以下方式创建一种方法来设置微调器中的数据:
You can create a method to set the data in the spinner in the following way:
public void showDataInSpinner(ArrayList<String> data) {
ArrayAdapter<String> adapter = new ArrayAdapter<>(
this, android.R.layout.simple_spinner_item, data
); //Create the Adapter to set the data
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //Set the layout resource to create the drop down views.
youSpinner.setAdapter(adapter); //Set the data to your spinner
}
这篇关于将Firebase数据传输到Spinner的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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