Source Code

package com.example.idk;

import android.content.Context;

import android.graphics.Color;

import android.hardware.Sensor;

import android.hardware.SensorManager;

import android.support.constraint.ConstraintLayout;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class MainActivity extends AppCompatActivity {

private SensorManager sensorManager;

private final float[] accelerometerReading = new float[3];

private final float[] magnetometerReading = new float[3];

float pitchMin = 180;

float pitchMax = 0;

float rollMin = 180;

float rollMax = 0;

float currentPitch = 0;

float currentRoll = 0;

private Sensor sensor;

private final float[] rotationMatrix = new float[9];

private final float[] orientationAngles = new float[3];

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button btn = findViewById(R.id.button2);

final ConstraintLayout myscreen = findViewById(R.id.myscreen);

sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

sensor = sensorManager.getDefaultSensor(Sensor.TYPE_GAME_ROTATION_VECTOR);

btn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

updateOrientationAngles();

}

});

Button btn2=findViewById(R.id.button3);

btn2.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

updateOrientationAnglesCurrent();

if(pitchMin <= currentPitch && currentPitch <= pitchMax && rollMax <= currentRoll && currentRoll <= rollMax)

myscreen.setBackgroundColor(Color.RED);

}

});

}

public void updateOrientationAngles() {

// Update rotation matrix, which is needed to update orientation angles.

SensorManager.getRotationMatrix(rotationMatrix, null,

accelerometerReading, magnetometerReading);

// "mRotationMatrix" now has up-to-date information.

SensorManager.getOrientation(rotationMatrix, orientationAngles);

if(pitchMin > orientationAngles[1])

pitchMin = orientationAngles[1];

if(pitchMax < orientationAngles[1])

pitchMax = orientationAngles[1];

if(rollMin > orientationAngles[2])

rollMin = orientationAngles[2];

if(rollMax < orientationAngles[2])

rollMax = orientationAngles[2];

// "mOrientationAngles" now has up-to-date information.

}

public void updateOrientationAnglesCurrent() {

// Update rotation matrix, which is needed to update orientation angles.

SensorManager.getRotationMatrix(rotationMatrix, null,

accelerometerReading, magnetometerReading);

// "mRotationMatrix" now has up-to-date information.

SensorManager.getOrientation(rotationMatrix, orientationAngles);

currentPitch = orientationAngles[1];

currentRoll = orientationAngles[2];

// "mOrientationAngles" now has up-to-date information.

}

}

<?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"

tools:context=".MainActivity">

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Tap to calibrate"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent" />

<Button

android:id="@+id/button2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Calibrate"

tools:layout_editor_absoluteX="161dp"

tools:layout_editor_absoluteY="435dp" />

</android.support.constraint.ConstraintLayout>