Add textview to show the temperature parameter is in (abnormal, normal) and show notification to app user (firebase)

Question

left shown firebase database, right shows the data retrieve from firebase in android studio(want to implement the textView which can shown (abnormal,normal) condition when exceed 30 Celcius)

I am currently using firebase database to retrieve real time parameter in Android Studio. I want to use TextView to show the parameters meet the condition by displaying abnormal(once exceed 30) and normal(lower than 30) condition. Any way that can show this.Thanks

public class RealtimeData extends AppCompatActivity {

private DatabaseReference mDatebase;


private TextView mTempView;
private TextView mHumidView;
;

//CHANGE WIFISTATE STARTS
WifiManager wifiManager;
TextView wifiStatusTextView;

//start

//end

Switch wifiSwitch;
//CHANGE WIFISTATE ENDS

@Override
protected void onCreate(Bundle savedInstanceState) {
    //test dialog out start
    buildDialog(RealtimeData.this).show();
    //test dialog out end
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_realtime_data);
    Toolbar toolbar = (Toolbar) findViewById(R.id.app_bar);
    setSupportActionBar(toolbar);

    //CHANGE WIFISTATE STARTS
    Toast.makeText(RealtimeData.this,"Make sure device is connected to The internet for latest data", Toast.LENGTH_LONG).show();
    wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
    wifiStatusTextView = (TextView)findViewById(R.id.wifi_status);
    wifiSwitch = (Switch) findViewById(R.id.wifiswitch);

    if (wifiManager.isWifiEnabled()){
        wifiStatusTextView.setText("Wifi status: ON");
        wifiSwitch.setChecked(true);
    }else{
        wifiStatusTextView.setText("Wifi status: OFF");
        wifiSwitch.setChecked(false);
    }

    wifiSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
            if (isChecked){
                wifiManager.setWifiEnabled(true);
                wifiStatusTextView.setText("Wifi status: ON");
                Toast.makeText(RealtimeData.this,"WIFI may take a moment to turn on", Toast.LENGTH_LONG).show();
            }else{
                wifiManager.setWifiEnabled(false);
                wifiStatusTextView.setText("Wifi status: OFF");
            }
        }
    });
    //CHANGE WIFISTATE ENDS

    mDatebase = FirebaseDatabase.getInstance().getReference().child("Region 1").child("Parameter Reading");
    mTempView = (TextView) findViewById(R.id.tempvalue);

    mDatebase.addValueEventListener(new com.google.firebase.database.ValueEventListener() {
        @Override
        public void onDataChange(com.google.firebase.database.DataSnapshot dataSnapshot) {
            for (com.google.firebase.database.DataSnapshot datasnap: dataSnapshot.getChildren()){
                String temp = datasnap.child("airtemperature").getValue(String.class);
                mTempView.setText("Air Temperature: " + temp + " *C");
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            mTempView.setText("Air Temperature: Error");

        }
    });

and xml file here are

<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#9575CD"
tools:context="com.dropbox.core.examples.android.RealtimeData">


<!--make sure android:id="@+id/include are not appear(automatically) in this 
column below (<include layout)-->
<include
    layout="@layout/app_bar" />

<TextView
    android:id="@+id/datavalue"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="DATA VALUE"
    android:textAlignment="center"
    android:textColor="@android:color/black"
    android:textSize="36sp"
    android:textStyle="bold"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.193" />

<TextView
    android:id="@+id/lastupdate"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Last Update"
    android:textSize="30sp"
    android:textStyle="bold"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.283" />

<TextView
    android:id="@+id/watertempvalue"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:text="Water Temperature:"
    android:textSize="24sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="1.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.672" />

<TextView
    android:id="@+id/tempvalue"
    android:layout_width="294dp"
    android:layout_height="wrap_content"
    android:text="Air Temperature:"
    android:textColor="#5D4037"
    android:textSize="24sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toStartOf="@+id/textView2"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.54" />

<TextView
    android:id="@+id/humidvalue"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginBottom="54dp"
    android:text="Air Humidity:"
    android:textColor="#004D40"
    android:textSize="24sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="1.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.667" />

<TextView
    android:id="@+id/datevalue"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:text="Date: "
    android:textColor="#3E2723"
    android:textSize="30sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="1.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.385" />

<TextView
    android:id="@+id/timevalue"
    android:layout_width="0dp"
    android:layout_height="34dp"
    android:text="Time:"
    android:textColor="#3E2729"
    android:textSize="30sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.457" />

<TextView
    android:id="@+id/pHvalue"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:text="pH: "
    android:textColor="#795548"
    android:textSize="24sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.732" />

<TextView
    android:id="@+id/levelvalue"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:text="Water level: "
    android:textColor="#424242"
    android:textSize="24sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.927" />

<TextView
    android:id="@+id/CO2value"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:text="CO2 :"
    android:textAllCaps="false"
    android:textColor="#01579B"
    android:textSize="24sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.792" />

<TextView
    android:id="@+id/textView2"
    android:layout_width="128dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="32dp"
    android:text="Abnormal"
    android:textSize="24sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintStart_toEndOf="@+id/tempvalue"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.54" />

<TextView
    android:id="@+id/wifi_status"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Wi-Fi status:"
    android:textColor="@android:color/background_dark"
    android:textSize="18sp"
    android:textStyle="bold"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.807"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.104" />

<!-- Start of Text TVOC button
<TextView
    android:id="@+id/TVOCvalue"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:text="TVOC: "
    android:textColor="#3E2723"
    android:textSize="30sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.836" />

    End of Text TVOC button-->

<TextView
    android:id="@+id/TDSvalue"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="1dp"
    android:text="TDS :"
    android:textColor="#212121"
    android:textSize="24sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.867" />

<Switch
    android:id="@+id/wifiswitch"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="@android:color/background_dark"
    android:textSize="18sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="1.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.162" />

    </android.support.constraint.ConstraintLayout>

edited part shows here

if (Float.valueOf(temp) < 30) {
        mTempView.setText("Air Temperature: " + temp + " *C" + " Normal");
    } else {
        mTempView.setText("Air Temperature: " + temp + " *C" + " Abnormal");
        public void showNotification(View view)
        {

          NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
          builder.setSmallIcon(R.drawable.impressive);
          builder.setContentTitle("Notification Alert");
          builder.setContentText(" Air Temperature abnormal!!");
          Intent intent = new Intent(this,RealtimeData.class);
          TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
          stackBuilder.addParentStack(RealtimeData.class);
          stackBuilder.addNextIntent(intent);
          PendingIntent pendingIntent = stackBuilder.getPendingIntent(0,PendingIntent.FLAG_UPDATE_CURRENT);
          builder.setContentIntent(pendingIntent);
          NotificationManager NM = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
          NM.notify(0,builder.build());

        }
    }

Answer 1

To solve this, please use the following code:

@Override
public void onDataChange(com.google.firebase.database.DataSnapshot dataSnapshot) {
    for (com.google.firebase.database.DataSnapshot datasnap: dataSnapshot.getChildren()){
        String temp = datasnap.child("airtemperature").getValue(String.class);
        if (Float.valueOf(temp) < 30) {
            mTempView.setText("Air Temperature: " + temp + " *C" + " Normal");
        } else {
            mTempView.setText("Air Temperature: " + temp + " *C" + " Abnormal");
        }
    }
}