oncreate() for MC 08/30

activity_main.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:layout_width="wrap_content"
    android:layout_height="match_parent"
    tools:context="com.healthmonitor.khann.healthmonitor.MainActivity">

    <Button
        android:id="@+id/run"
        style="@style/Widget.AppCompat.Button.Borderless"
        android:layout_width="89dp"
        android:layout_height="40dp"
        android:layout_marginLeft="387dp"
        android:layout_marginStart="387dp"
        android:layout_marginTop="16dp"
        android:background="@android:color/holo_green_light"
        android:text="Run"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/stop"
        android:layout_width="87dp"
        android:layout_height="40dp"
        android:layout_marginTop="16dp"
        android:background="@android:color/holo_red_light"
        android:text="Stop"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/run"
        android:layout_marginLeft="8dp" />

    <com.jjoe64.graphview.GraphView
        android:id="@+id/graph"
        android:layout_width="558dp"
        android:layout_height="204dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="67dp"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="60dp"
        android:layout_height="42dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="P Name"
        android:textSize="12sp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp"
        app:layout_constraintLeft_toRightOf="@+id/editText5"
        android:layout_marginLeft="8dp" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="45dp"
        android:layout_height="42dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="P ID:"
        android:textSize="12sp"
        tools:layout_editor_absoluteX="16dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp" />

    <EditText
        android:id="@+id/editText5"
        android:layout_width="50dp"
        android:layout_height="42dp"
        android:ems="10"
        android:inputType="number"
        android:text="Age"
        android:textSize="12sp"
        app:layout_constraintLeft_toRightOf="@+id/editText2"
        android:layout_marginLeft="9dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp" />

    <TextView
        android:id="@+id/textView6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Sex:"
        android:textSize="12sp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="34dp"
        app:layout_constraintLeft_toRightOf="@+id/editText"
        android:layout_marginLeft="12dp" />

    <RadioGroup
        android:id="@+id/radioSex"
        android:layout_width="159dp"
        android:layout_height="57dp"
        android:layout_marginLeft="12dp"
        android:layout_marginTop="-1dp"
        android:checkedButton="@+id/radioButton"
        android:orientation='horizontal'
        app:layout_constraintLeft_toRightOf="@+id/editText"
        app:layout_constraintTop_toTopOf="parent">>

        <RadioButton
            android:id="@+id/radioButton"
            android:layout_width="75dp"
            android:layout_height="26dp"
            android:layout_marginLeft="14dp"
            android:layout_marginTop="30dp"
            android:scaleX="0.5"
            android:scaleY="0.5"
            android:text="Female"
            android:textSize="12sp"
            app:layout_constraintLeft_toRightOf="@+id/radioButton2"
            app:layout_constraintTop_toTopOf="parent" />

        <RadioButton
            android:id="@+id/radioButton2"
            android:layout_width="64dp"
            android:layout_height="27dp"
            android:layout_marginLeft="14dp"
            android:layout_marginTop="29dp"
            android:scaleX="0.5"
            android:scaleY="0.5"
            android:text="Male"
            android:textSize="12sp"
            app:layout_constraintLeft_toRightOf="@+id/editText"
            app:layout_constraintTop_toTopOf="parent" />
    </RadioGroup>


</android.support.constraint.ConstraintLayout>

MainActivity.java

package com.healthmonitor.khann.healthmonitor;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.LineGraphSeries;
import com.jjoe64.graphview.Viewport;
import java.util.Random;
import android.widget.Button;
import android.view.View.OnClickListener;
import android.util.Log;

public class MainActivity extends AppCompatActivity implements OnClickListener {
    // Declare all the private variables for this class
    private LineGraphSeries mSeries1 = new LineGraphSeries<>();

    Random rand = new Random();
    int x_value = 0;
    Button runButton, stopButton;
    GraphView graphView;
    boolean firstRun = true;

// Reference to implement own Runnable class:
// https://www.tutorialspoint.com/java/java_thread_control.htm
    class RunnableDemo implements Runnable {
        public Thread thread;
        public boolean suspended = false;

        RunnableDemo() {
        }

        public void run() {
        // we add 5000 new entries
                for (int i = 0; i < 5000; i++) {
                    runOnUiThread(new RunnableDemo() {
                        @Override
                        public void run() {
                            addEntry();
                        }
                    });

                    // sleep to slow down the add of entries
                    try {
                        Thread.sleep(500);
                        synchronized (this) {
                            while (suspended) {
                                wait();
                            }
                        }
                    } catch (InterruptedException e) {
                        // manage error ...
                    }
                }
        }

         void start () {
            if (thread == null) {
                thread = new Thread (this);
                thread.start ();
            }
        }

        void suspend() {
            suspended = true;
        }

        synchronized void resume() {
            suspended = false;
            notify();
        }
    }

    RunnableDemo R1 = new RunnableDemo();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // All initializations should go here
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        runButton = (Button) findViewById(R.id.run);
        runButton.setOnClickListener(this);
        stopButton = (Button) findViewById(R.id.stop);
        stopButton.setOnClickListener(this);
        graphView = (GraphView) findViewById(R.id.graph);
        Viewport viewport = graphView.getViewport();
        viewport.setYAxisBoundsManual(true);
        viewport.setMinY(0);
        viewport.setMaxY(2000);
        viewport.setScrollable(true);
        viewport.setBackgroundColor(-16777216);
        viewport.setDrawBorder(true);
        viewport.setXAxisBoundsManual(true);
        viewport.setMinX(0);
        viewport.setMaxX(40);
        viewport.setScalable(true);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.run:
                Log.d("MR.bool", "Run was clicked ");
                runButton.setEnabled(false);
                stopButton.setEnabled(true);
                graphView.addSeries(mSeries1);
                if (firstRun) {
                    R1.start();
                } else {
                    R1.resume();
                }
                break;
            case R.id.stop:
                // TODO Need to write function for stop by adding wait() to the thread
                Log.d("MR.bool", "Stop was clicked ");
                GraphView graph = (GraphView) findViewById(R.id.graph);
                graph.removeAllSeries();
                runButton.setEnabled(true);
                stopButton.setEnabled(false);
                firstRun = false;
                R1.suspend();
                break;
        }
    }
    
    private void addEntry() {
        float y = rand.nextFloat() * (2000 - 20) + 20;
        mSeries1.appendData(new DataPoint(x_value, y), true, 500);
        x_value += 1;
    }
}

Go to activity_main.xml and then change button names to "run" and "stop"

<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.healthmonitor.khann.healthmonitor.MainActivity">

<com.jjoe64.graphview.GraphView
    android:id="@+id/graph"
    android:layout_width="match_parent"
    android:layout_height="204dp"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="65dp"
    app:layout_constraintHorizontal_bias="0.265"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/run"
    style="@style/Widget.AppCompat.Button.Borderless"
    android:layout_width="78dp"
    android:layout_height="36dp"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="16dp"
    android:background="@android:color/holo_green_light"
    android:text="Run"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    tools:layout_editor_absoluteX="10dp"
    tools:layout_editor_absoluteY="26dp" />

<Button
    android:id="@+id/stop"
    android:layout_width="84dp"
    android:layout_height="36dp"
    android:layout_marginLeft="27dp"
    android:layout_marginTop="16dp"
    android:background="@android:color/holo_red_light"
    android:text="Stop"
    app:layout_constraintLeft_toRightOf="@+id/run"
    app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

Copy paste the above file in activity_main.xml

package com.healthmonitor.khann.healthmonitor;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.LineGraphSeries;
import com.jjoe64.graphview.Viewport;
import java.util.Random;
import android.widget.Button;
import android.view.View.OnClickListener;
import android.util.Log;

public class MainActivity extends AppCompatActivity implements OnClickListener {
// Declare all the private variables for this class
private LineGraphSeries mSeries1 = new LineGraphSeries<>();

Random rand = new Random();
int x_value=0;
Thread thread = new Thread();
@Override
protected void onCreate(Bundle savedInstanceState) {
    // All initializations should go here
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button runButton = (Button) findViewById(R.id.run);
    runButton.setOnClickListener(this);
    Button stopButton = (Button) findViewById(R.id.stop);
    stopButton.setOnClickListener(this);
    GraphView graphView = (GraphView) findViewById(R.id.graph);
    graphView.addSeries(mSeries1);

    Viewport viewport = graphView.getViewport();
    viewport.setBackgroundColor(-16777216);
    viewport.setDrawBorder(true);
    viewport.setXAxisBoundsManual(true);
    viewport.setYAxisBoundsManual(true);
    viewport.setMinX(0);
    viewport.setMaxX(400);
    viewport.setMinY(0);
    viewport.setMaxY(2000);
    viewport.setScrollable(true);
    viewport.setScalable(true);
}

@Override
public void onClick(View view) {
    switch (view.getId()) {
        case R.id.run:
            thread = new Thread(new Runnable() {
                @Override
                public void run() {
                    // we add 100 new entries
                    for (int i = 0; i < 5000; i++) {
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                addEntry();
                            }
                        });

                        // sleep to slow down the add of entries
                        try {
                            Thread.sleep(100);
                        } catch (InterruptedException e) {
                            // manage error ...
                        }
                    }
                }
            });
            thread.start();
        case R.id.stop:
            // TODO Need to write function for stop by adding wait() to the thread
            Log.d("MR.bool", "Stop was clicked ");
            /* Following is NOT the correct way to implement stop.
            GraphView graph = (GraphView) findViewById(R.id.graph);
            //graph.removeAllSeries();
            */
    }
}



private void addEntry() {
    float y = rand.nextFloat()* (2000 - 20) + 20;
    mSeries1.appendData(new DataPoint(x_value, y), true, 500);
    x_value+=1;
}

}

Above file is updated view file. Keep the number of data points added to series greater than the number of data points desired to view.
There is an issue with RUNbutton, multiple clicks are making the activity run faster (Try n see).

Check how to pause a thread:

https://stackoverflow.com/questions/1520887/how-to-pause-sleep-thread-or-process-in-android
https://stackoverflow.com/questions/6776327/how-to-pause-resume-thread-in-android
https://stackoverflow.com/questions/30223215/runnable-pause-and-resume-thread

<?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="wrap_content"
    android:layout_height="match_parent"
    tools:context="com.healthmonitor.khann.healthmonitor.MainActivity">

    <Button
        android:id="@+id/run"
        style="@style/Widget.AppCompat.Button.Borderless"
        android:layout_width="89dp"
        android:layout_height="40dp"
        android:layout_marginLeft="387dp"
        android:layout_marginStart="387dp"
        android:layout_marginTop="16dp"
        android:background="@android:color/holo_green_light"
        android:text="Run"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/stop"
        android:layout_width="87dp"
        android:layout_height="40dp"
        android:layout_marginTop="16dp"
        android:background="@android:color/holo_red_light"
        android:text="Stop"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/run"
        android:layout_marginLeft="8dp" />

    <com.jjoe64.graphview.GraphView
        android:id="@+id/graph"
        android:layout_width="558dp"
        android:layout_height="204dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="67dp"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="60dp"
        android:layout_height="42dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="P Name"
        android:textSize="12sp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp"
        app:layout_constraintLeft_toRightOf="@+id/editText5"
        android:layout_marginLeft="8dp" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="45dp"
        android:layout_height="42dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="P ID:"
        android:textSize="12sp"
        tools:layout_editor_absoluteX="16dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp" />

    <EditText
        android:id="@+id/editText5"
        android:layout_width="50dp"
        android:layout_height="42dp"
        android:ems="10"
        android:inputType="number"
        android:text="Age"
        android:textSize="12sp"
        app:layout_constraintLeft_toRightOf="@+id/editText2"
        android:layout_marginLeft="9dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp" />

    <TextView
        android:id="@+id/textView6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Sex:"
        android:textSize="12sp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="34dp"
        app:layout_constraintLeft_toRightOf="@+id/editText"
        android:layout_marginLeft="12dp" />

    <RadioGroup
        android:id="@+id/radioSex"
        android:layout_width="159dp"
        android:layout_height="57dp"
        android:layout_marginLeft="12dp"
        android:layout_marginTop="-1dp"
        android:checkedButton="@+id/radioButton"
        android:orientation='horizontal'
        app:layout_constraintLeft_toRightOf="@+id/editText"
        app:layout_constraintTop_toTopOf="parent">>

        <RadioButton
            android:id="@+id/radioButton"
            android:layout_width="75dp"
            android:layout_height="26dp"
            android:layout_marginLeft="14dp"
            android:layout_marginTop="30dp"
            android:scaleX="0.5"
            android:scaleY="0.5"
            android:text="Female"
            android:textSize="12sp"
            app:layout_constraintLeft_toRightOf="@+id/radioButton2"
            app:layout_constraintTop_toTopOf="parent" />

        <RadioButton
            android:id="@+id/radioButton2"
            android:layout_width="64dp"
            android:layout_height="27dp"
            android:layout_marginLeft="14dp"
            android:layout_marginTop="29dp"
            android:scaleX="0.5"
            android:scaleY="0.5"
            android:text="Male"
            android:textSize="12sp"
            app:layout_constraintLeft_toRightOf="@+id/editText"
            app:layout_constraintTop_toTopOf="parent" />
    </RadioGroup>


</android.support.constraint.ConstraintLayout>

<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="wrap_content"
android:layout_height="match_parent"
tools:context="com.healthmonitor.khann.healthmonitor.MainActivity">

<Button
    android:id="@+id/run"
    style="@style/Widget.AppCompat.Button.Borderless"
    android:layout_width="89dp"
    android:layout_height="40dp"
    android:layout_marginLeft="387dp"
    android:layout_marginStart="387dp"
    android:layout_marginTop="16dp"
    android:background="@android:color/holo_green_light"
    android:text="Run"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/stop"
    android:layout_width="87dp"
    android:layout_height="40dp"
    android:layout_marginTop="16dp"
    android:background="@android:color/holo_red_light"
    android:text="Stop"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintLeft_toRightOf="@+id/run"
    android:layout_marginLeft="8dp" />

<com.jjoe64.graphview.GraphView
    android:id="@+id/graph"
    android:layout_width="558dp"
    android:layout_height="204dp"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="16dp"
    android:layout_marginTop="67dp"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<EditText
    android:id="@+id/editText"
    android:layout_width="60dp"
    android:layout_height="42dp"
    android:ems="10"
    android:inputType="textPersonName"
    android:hint="P Name"
    android:textSize="12sp"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="16dp"
    app:layout_constraintLeft_toRightOf="@+id/editText5"
    android:layout_marginLeft="8dp" />

<EditText
    android:id="@+id/editText2"
    android:layout_width="45dp"
    android:layout_height="42dp"
    android:ems="10"
    android:inputType="textPersonName"
    android:hint="P ID:"
    android:textSize="12sp"
    tools:layout_editor_absoluteX="16dp"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="16dp" />

<EditText
    android:id="@+id/editText5"
    android:layout_width="50dp"
    android:layout_height="42dp"
    android:ems="10"
    android:inputType="number"
    android:hint="Age"
    android:textSize="12sp"
    app:layout_constraintLeft_toRightOf="@+id/editText2"
    android:layout_marginLeft="9dp"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="16dp" />

<TextView
    android:id="@+id/textView6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Sex:"
    android:textSize="12sp"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="34dp"
    app:layout_constraintLeft_toRightOf="@+id/editText"
    android:layout_marginLeft="12dp" />

<RadioGroup
    android:id="@+id/radioSex"
    android:layout_width="159dp"
    android:layout_height="57dp"
    android:layout_marginLeft="12dp"
    android:layout_marginTop="-1dp"
    android:checkedButton="@+id/radioButton"
    android:orientation='horizontal'
    app:layout_constraintLeft_toRightOf="@+id/editText"
    app:layout_constraintTop_toTopOf="parent">>

    <RadioButton
        android:id="@+id/radioButton"
        android:layout_width="75dp"
        android:layout_height="26dp"
        android:layout_marginLeft="14dp"
        android:layout_marginTop="30dp"
        android:scaleX="0.5"
        android:scaleY="0.5"
        android:text="Female"
        android:textSize="12sp"
        app:layout_constraintLeft_toRightOf="@+id/radioButton2"
        app:layout_constraintTop_toTopOf="parent" />

    <RadioButton
        android:id="@+id/radioButton2"
        android:layout_width="64dp"
        android:layout_height="27dp"
        android:layout_marginLeft="14dp"
        android:layout_marginTop="29dp"
        android:scaleX="0.5"
        android:scaleY="0.5"
        android:text="Male"
        android:textSize="12sp"
        app:layout_constraintLeft_toRightOf="@+id/editText"
        app:layout_constraintTop_toTopOf="parent" />
</RadioGroup>

</android.support.constraint.ConstraintLayout>

Minor change in xml

package com.healthmonitor.khann.healthmonitor;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.LineGraphSeries;
import com.jjoe64.graphview.Viewport;
import java.util.Random;
import android.widget.Button;
import android.view.View.OnClickListener;
import android.util.Log;

public class MainActivity extends AppCompatActivity implements OnClickListener {
// Declare all the private variables for this class
private LineGraphSeries mSeries1 = new LineGraphSeries<>();

Random rand = new Random();
int x_value = 0;
//Thread thread = new Thread();
Button runButton, stopButton;
GraphView graphView;
boolean firstRun = true;
//Handler handler;
//boolean suspended = false;

class RunnableDemo implements Runnable {
    public Thread thread;
    //private String threadName;
    public boolean suspended = false;

    RunnableDemo() {
        //threadName = name;
        //System.out.println("Creating " +  threadName );
    }

    public void run() {

// while (true) {
//
// synchronized (this) {
// while (suspended) {
// try {
// wait();
// } catch (InterruptedException e) {
// e.printStackTrace();
// }
// }
//
// runOnUiThread(new Runnable() {
// @OverRide
// public void run() {
// addEntry();
// }
// });
// try {
// Thread.sleep(500);
// } catch (InterruptedException e) {
//
// }
// }
// }
// }
//System.out.println("Running " + threadName );
// we add 100 new entries
for (int i = 0; i < 5000; i++) {
runOnUiThread(new RunnableDemo() {
@OverRide
public void run() {
addEntry();
}
});

                // sleep to slow down the add of entries
                try {
                    Thread.sleep(500);
                    synchronized (this) {
                        while (suspended) {
                            wait();
                        }
                    }
                } catch (InterruptedException e) {
                    // manage error ...
                }
            }
    }

     void start () {
        if (thread == null) {
            thread = new Thread (this);
            thread.start ();
        }
    }

    void suspend() {
        System.out.print("Suspending the thread");
        suspended = true;
    }

    synchronized void resume() {
        System.out.print("Resuming the thread");
        suspended = false;
        notify();
    }
}

RunnableDemo R1 = new RunnableDemo();
@Override
protected void onCreate(Bundle savedInstanceState) {
    // All initializations should go here
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    runButton = (Button) findViewById(R.id.run);
    runButton.setOnClickListener(this);
    stopButton = (Button) findViewById(R.id.stop);
    stopButton.setOnClickListener(this);
    graphView = (GraphView) findViewById(R.id.graph);
    Viewport viewport = graphView.getViewport();
    viewport.setYAxisBoundsManual(true);
    viewport.setMinY(0);
    viewport.setMaxY(2000);
    viewport.setScrollable(true);
    viewport.setBackgroundColor(-16777216);
    viewport.setDrawBorder(true);
    viewport.setXAxisBoundsManual(true);
    viewport.setMinX(0);
    viewport.setMaxX(40);
    viewport.setScalable(true);
}

@Override
public void onClick(View view) {
    switch (view.getId()) {
        case R.id.run:
            Log.d("MR.bool", "Run was clicked ");
            runButton.setEnabled(false);
            stopButton.setEnabled(true);
            graphView.addSeries(mSeries1);
            if (firstRun) {
                R1.start();
            } else {
                R1.resume();

// try {
// R1.thread.join();
// } catch (InterruptedException e) {
// //pass
// }
}
// if (firstRun) {
// firstRun = false;
// thread = new Thread(new Runnable() {
// @OverRide
// public void run() {
// // we add 100 new entries
// for (int i = 0; i < 5000; i++) {
// runOnUiThread(new Runnable() {
// @OverRide
// public void run() {
// addEntry();
// }
// });
//
// // sleep to slow down the add of entries
// try {
// Thread.sleep(500);
// synchronized (this) {
// while (suspended) {
// System.out.println("suspended");
// }
// }
// } catch (InterruptedException e) {
// // manage error ...
// }
// }
// }
// });
// thread.start();
break;
case R.id.stop:
// TODO Need to write function for stop by adding wait() to the thread
Log.d("MR.bool", "Stop was clicked ");
GraphView graph = (GraphView) findViewById(R.id.graph);
graph.removeAllSeries();
runButton.setEnabled(true);
stopButton.setEnabled(false);
firstRun = false;
R1.suspend();
break;
}
}

// synchronized void suspend() {
// suspended = true;
// }
//
// synchronized void resume() {
// suspended = false;
// notify();
// }

private void addEntry() {
    float y = rand.nextFloat() * (2000 - 20) + 20;
    mSeries1.appendData(new DataPoint(x_value, y), true, 500);
    x_value += 1;
}

}

`package com.healthmonitor.khann.healthmonitor;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.LineGraphSeries;
import com.jjoe64.graphview.Viewport;
import java.util.Random;
import android.widget.Button;
import android.view.View.OnClickListener;
import android.util.Log;

// Wherever not marked as reference, is our code.
public class MainActivity extends AppCompatActivity implements OnClickListener {
// Declare all the private variables for this class
private LineGraphSeries mSeries1 = new LineGraphSeries<>();

Random rand = new Random();
int x_value = 0;
Button runButton, stopButton;
GraphView graphView;
boolean firstRun = true;

// Reference to implement own Runnable class:
// https://www.tutorialspoint.com/java/java_thread_control.htm
class RunnableDemo implements Runnable {
    public Thread thread;
    public boolean suspended = false;

    public void run() {
        // we add 5000 new entries
        for (int i = 0; i < 5000; i++) {
            runOnUiThread(new RunnableDemo() {
                @Override
                public void run() {
                    addEntry();
                }
            });

            // sleep to slow down the add of entries

            try {
                Thread.sleep(500);
                synchronized (this) {
                    while (suspended) {
                        wait();
                    }
                }
            } catch (InterruptedException e) {
                System.out.println("Exception caught: " + e);
            }
        }
    }

    void start () {
        if (thread == null) {
            thread = new Thread (this);
            thread.start ();
        }
    }

    void suspend() {
        suspended = true;
    }

    synchronized void resume() {
        suspended = false;
        notify();
    }
}


RunnableDemo R1 = new RunnableDemo();
@Override
protected void onCreate(Bundle savedInstanceState) {
    // All initializations should go here
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    runButton = (Button) findViewById(R.id.run);
    runButton.setOnClickListener(this);
    stopButton = (Button) findViewById(R.id.stop);
    stopButton.setOnClickListener(this);
    graphView = (GraphView) findViewById(R.id.graph);
    Viewport viewport = graphView.getViewport();
    viewport.setYAxisBoundsManual(true);
    viewport.setMinY(0);
    viewport.setMaxY(2000);
    viewport.setScrollable(true);
    viewport.setBackgroundColor(-16777216);
    viewport.setDrawBorder(true);
    viewport.setXAxisBoundsManual(true);
    viewport.setMinX(0);
    viewport.setMaxX(40);
    viewport.setScalable(true);
}

@Override
public void onClick(View view) {
    switch (view.getId()) {
        case R.id.run:
            // Triggered when run is clicked
            Log.d("MR.bool", "Run was clicked ");
           // runButton.setEnabled(false);
           // stopButton.setEnabled(true);
            graphView.addSeries(mSeries1);
            if (firstRun) {
                R1.start();
            } else {
                R1.resume();
            }
            break;
        case R.id.stop:
            //Triggered when stop is clicked
            Log.d("MR.bool", "Stop was clicked ");
            GraphView graph = (GraphView) findViewById(R.id.graph);
            graph.removeAllSeries();
            //runButton.setEnabled(true);
           // stopButton.setEnabled(false);
            firstRun = false;
            R1.suspend();
            break;
    }
}

// Appends series objects to list after sleep in thread.
// http://www.ssaurel.com/blog/create-a-real-time-line-graph-in-android-with-graphview/
private void addEntry() {
    float y = rand.nextFloat() * (2000 - 20) + 20;
    mSeries1.appendData(new DataPoint(x_value, y), true, 500);
    x_value += 1;
}

}`

package com.healthmonitor.khann.healthmonitor;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.LineGraphSeries;
import com.jjoe64.graphview.Viewport;
import java.util.Random;
import android.widget.Button;
import android.view.View.OnClickListener;
import android.util.Log;

// Wherever not marked as reference, is our code.
public class MainActivity extends AppCompatActivity implements OnClickListener {
    // Declare all the private variables for this class
    private LineGraphSeries mSeries1 = new LineGraphSeries<>();

    Random rand = new Random();
    int x_value = 0;
    Button runButton, stopButton;
    GraphView graphView;
    boolean firstRun = true;

    // Reference to implement own Runnable class:
    // https://www.tutorialspoint.com/java/java_thread_control.htm
    class RunnableDemo implements Runnable {
        public Thread thread;
        public boolean suspended = false;

        public void run() {
            // we add 5000 new entries
            for (int i = 0; i < 5000; i++) {
                runOnUiThread(new RunnableDemo() {
                    @Override
                    public void run() {
                        addEntry();
                    }
                });

                // sleep to slow down the add of entries

                try {
                    Thread.sleep(500);
                    synchronized (this) {
                        while (suspended) {
                            wait();
                        }
                    }
                } catch (InterruptedException e) {
                    System.out.println("Exception caught: " + e);
                }
            }
        }

        void start () {
            if (thread == null) {
                thread = new Thread (this);
                thread.start ();
            }
        }

        void suspend() {
            suspended = true;
        }

        synchronized void resume() {
            suspended = false;
            notify();
        }
    }


    RunnableDemo R1 = new RunnableDemo();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // All initializations should go here
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        runButton = (Button) findViewById(R.id.run);
        runButton.setOnClickListener(this);
        stopButton = (Button) findViewById(R.id.stop);
        stopButton.setOnClickListener(this);
        graphView = (GraphView) findViewById(R.id.graph);
        Viewport viewport = graphView.getViewport();
        viewport.setYAxisBoundsManual(true);
        viewport.setMinY(0);
        viewport.setMaxY(2000);
        viewport.setScrollable(true);
        viewport.setBackgroundColor(-16777216);
        viewport.setDrawBorder(true);
        viewport.setXAxisBoundsManual(true);
        viewport.setMinX(0);
        viewport.setMaxX(40);
        viewport.setScalable(true);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.run:
                // Triggered when run is clicked
                Log.d("MR.bool", "Run was clicked ");
               // runButton.setEnabled(false);
               // stopButton.setEnabled(true);
                graphView.addSeries(mSeries1);
                if (firstRun) {
                    R1.start();
                } else {
                    R1.resume();
                }
                break;
            case R.id.stop:
                //Triggered when stop is clicked
                Log.d("MR.bool", "Stop was clicked ");
                GraphView graph = (GraphView) findViewById(R.id.graph);
                graph.removeAllSeries();
                //runButton.setEnabled(true);
               // stopButton.setEnabled(false);
                firstRun = false;
                R1.suspend();
                break;
        }
    }

    // Appends series objects to list after sleep in thread.
    // http://www.ssaurel.com/blog/create-a-real-time-line-graph-in-android-with-graphview/
    private void addEntry() {
        float y = rand.nextFloat() * (2000 - 20) + 20;
        mSeries1.appendData(new DataPoint(x_value, y), true, 500);
        x_value += 1;
    }
}

<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="wrap_content"
    android:layout_height="match_parent"
    tools:context="com.healthmonitor.khann.healthmonitor.MainActivity">

    <Button
        android:id="@+id/run"
        style="@style/Widget.AppCompat.Button.Borderless"
        android:layout_width="114dp"
        android:layout_height="57dp"
        android:background="@android:color/holo_green_light"
        android:text="Run"
        android:layout_marginLeft="61dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="76dp" />

    <Button
        android:id="@+id/stop"
        android:layout_width="114dp"
        android:layout_height="57dp"
        android:background="@android:color/holo_red_light"
        android:text="Stop"
        app:layout_constraintLeft_toRightOf="@+id/run"
        android:layout_marginLeft="13dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="76dp" />

    <com.jjoe64.graphview.GraphView
        android:id="@+id/graph"
        android:layout_width="327dp"
        android:layout_height="328dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="158dp"
        app:layout_constraintHorizontal_bias="0.166"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="60dp"
        android:layout_height="42dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:hint="P Name"
        android:textSize="12sp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp"
        app:layout_constraintLeft_toRightOf="@+id/editText5"
        android:layout_marginLeft="8dp" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="45dp"
        android:layout_height="42dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:hint="P ID:"
        android:textSize="12sp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp"
        android:layout_marginLeft="8dp"
        app:layout_constraintLeft_toLeftOf="parent" />

    <EditText
        android:id="@+id/editText5"
        android:layout_width="50dp"
        android:layout_height="42dp"
        android:ems="10"
        android:inputType="number"
        android:hint="Age"
        android:textSize="12sp"
        app:layout_constraintLeft_toRightOf="@+id/editText2"
        android:layout_marginLeft="17dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp" />

    <TextView
        android:id="@+id/textView6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Sex:"
        android:textSize="12sp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="34dp"
        app:layout_constraintLeft_toRightOf="@+id/editText"
        android:layout_marginLeft="12dp" />

    <RadioGroup
        android:id="@+id/radioSex"
        android:layout_width="159dp"
        android:layout_height="57dp"
        android:layout_marginLeft="12dp"
        android:layout_marginTop="-1dp"
        android:checkedButton="@+id/radioButton"
        android:orientation='horizontal'
        app:layout_constraintLeft_toRightOf="@+id/editText"
        app:layout_constraintTop_toTopOf="parent">>

        <RadioButton
            android:id="@+id/radioButton"
            android:layout_width="75dp"
            android:layout_height="26dp"
            android:layout_marginLeft="14dp"
            android:layout_marginTop="30dp"
            android:scaleX="0.5"
            android:scaleY="0.5"
            android:text="Female"
            android:textSize="12sp"
            app:layout_constraintLeft_toRightOf="@+id/radioButton2"
            app:layout_constraintTop_toTopOf="parent" />

        <RadioButton
            android:id="@+id/radioButton2"
            android:layout_width="64dp"
            android:layout_height="27dp"
            android:layout_marginLeft="14dp"
            android:layout_marginTop="29dp"
            android:scaleX="0.5"
            android:scaleY="0.5"
            android:text="Male"
            android:textSize="12sp"
            app:layout_constraintLeft_toRightOf="@+id/editText"
            app:layout_constraintTop_toTopOf="parent" />
    </RadioGroup>
</android.support.constraint.ConstraintLayout>