Android Sensor(Light Sensor)

In Room With No Light

In Room With Dim Light

In Room With Normal Light

Create new Android Project
Project Name: LightSensor
//tested from 2.3.3 to current android sdk 
Build Target: Android 2.3.3   //or greater than that
Application Name: LightSensor
Package Name: com.shaikhhamadali.blogspot.lightsensor
Create layout file: activity_light_sensor

1.create layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".LightSensor" >
 <TextView
        android:id="@+id/TextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        android:text="Light Sensor"
        android:textColor="#0835C9"
        android:textSize="30sp" />
    <TextView 
    android:id="@+id/tVMaxValue"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@id/TextView"
    android:textSize="20sp"/>
 <TextView 
    android:id="@+id/tVCurrentLight"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@id/tVMaxValue"
    android:layout_marginTop="10dp"
    android:textSize="20sp"
    />

</RelativeLayout>

2.code of activity:

package com.shaikhhamadali.blogspot.lightsensor;

import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
 
public class LightSensor extends Activity implements SensorEventListener{
 //SensorManager lets you access the device's sensors
 //declare Variables
 private SensorManager sensorManager;
    TextView tVMaxValue, tVCurrentLight;
  
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_light_sensor);
        tVMaxValue = (TextView)findViewById(R.id.tVMaxValue);
        tVCurrentLight = (TextView)findViewById(R.id.tVCurrentLight);
  //create instance of sensor manager and get system service to interact with Sensor
        sensorManager= (SensorManager)getSystemService(Context.SENSOR_SERVICE);
        Sensor lightSensor= sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
      
        if (lightSensor == null){
         Toast.makeText(LightSensor.this,"No Light Sensor Found! ",Toast.LENGTH_LONG).show();
        }else{ float max =  lightSensor.getMaximumRange();
          //Get Maximum Value From Light sensor
           tVMaxValue.setText("Max Range: " + String.valueOf(max));
           sensorManager.registerListener(this,lightSensor,SensorManager.SENSOR_DELAY_NORMAL);
        }
    }
     
    @Override
 protected void onResume() {
  super.onResume();
  // register this class as a listener for the lightSensor
  sensorManager.registerListener(this,
    sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT),
    SensorManager.SENSOR_DELAY_NORMAL);
 }
    @Override
 protected void onPause() {
  // unregister listener
  super.onPause();
  sensorManager.unregisterListener(this);
 }
 @Override
 public void onAccuracyChanged(Sensor sensor, int accuracy) {
  
 }
 // called when sensor value have changed
 @Override
 public void onSensorChanged(SensorEvent event) {
  // The light sensor returns a single value.
     // Many sensors return 3 values, one for each axis.
     if(event.sensor.getType()==Sensor.TYPE_LIGHT){
       float currentLight = event.values[0];
       if(currentLight<1){tVCurrentLight.setText("Current light: " + "no Light");}
       else if(currentLight<5){tVCurrentLight.setText("Current light is Dim:" + String.valueOf(currentLight));}
       else if(currentLight<10){tVCurrentLight.setText("Current light is Normal:" + String.valueOf(currentLight));}
       else if(currentLight<100){tVCurrentLight.setText("Current light is Bright(Room):" + String.valueOf(currentLight));}
       else tVCurrentLight.setText("Current light is Bright(Sun):" + String.valueOf(currentLight));
 }}
}

3. note that:

• you can use TYPE_LIGHT sensor to check the Light reading as i used to create Light Sensor or for any other reasons you want related to light.
• must unregister Sensor on pause and register on resume.
• Learn More About Barometer-Pressure sensor
• Learn more about Sensors and multiple types of sensors.
• Learn about how to get device Sensor List.
• Learn about use Of Type Accelerometer Sensor.

4. conclusion:

• Some information about how to use TYPE_LIGHT sensor.
• know what are Sensors and how to use Sensors.
• know that light readings change in different light.

5. About the post:

• The code seems to explain itself due to comments, but if you have any questions you can freely ask too!
•  Don’t mind to write a comment whatever you like to ask, to know,to suggest or recommend.
•  Hope you enjoy it!

6. Source Code:

        you can download the source code here