Tuesday, February 1, 2011

Implement SensorEventListener to monitor Android light sensor

Last exercise "Get Light Sensor of Android device", this exercise further implement a SensorEventListener to monitor light sensor changed.

SensorEventListener to monitor Android light sensor

package com.exercise.AndroidLightSensor;

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;

public class AndroidLightSensor extends Activity {

SensorManager mySensorManager;
Sensor myLightSensor;
TextView textLightSensorData;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView textLightSensor = (TextView)findViewById(R.id.lightsensor);
textLightSensorData = (TextView)findViewById(R.id.lightsensordata);

mySensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
myLightSensor = mySensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);

if (myLightSensor == null){
textLightSensor.setText("No Light Sensor!");
}else{
textLightSensor.setText(myLightSensor.getName());

mySensorManager.registerListener(lightSensorEventListener,
myLightSensor,
SensorManager.SENSOR_DELAY_NORMAL);
}
}

SensorEventListener lightSensorEventListener
= new SensorEventListener(){

@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub

}

@Override
public void onSensorChanged(SensorEvent arg0) {
// TODO Auto-generated method stub
if(arg0.sensor.getType()==Sensor.TYPE_LIGHT){
textLightSensorData.setText("Light Sensor Date:"
+ String.valueOf(arg0.values[0]));
}
}};
}


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<TextView
android:id="@+id/lightsensor"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/lightsensordata"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>


Download the files.

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