Proximity Sensor in Android Part-2

In my previous post, We have some basic understanding of Proximity sensor in android. You can go through that post if you have not seen yet.

http://androidconceptspp.blogspot.in/2015/02/proximity-sensor-in-android-part-1.html

In this post we will have some fun with proximity sensor. The sample application is something like below picture. When you put your finger near the proximity sensor, image will changed from icon launcher to heart shape and when you put away your finger launcher icon will be restored. Also a text will be displayed showing number of time this sensor has produced the value.

Now, let us create the required source code for the application.

MainActivity.java

import android.app.Activity; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.widget.ImageView; import android.widget.TextView; public class MainActivity extends Activity implements SensorEventListener { SensorManager sManager; Sensor proximity; TextView counter; ImageView imageView; static int count=0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sManager = (SensorManager) getSystemService(SENSOR_SERVICE); counter = (TextView) findViewById(R.id.sensor_counter); counter.setText(""); proximity = sManager.getDefaultSensor(Sensor.TYPE_PROXIMITY); if (proximity == null) { counter.setText("Proximity Sensor Not Available"); } imageView = (ImageView)findViewById(R.id.imageView1); } @Override protected void onResume() { super.onResume(); sManager.registerListener(this, proximity, SensorManager.SENSOR_DELAY_NORMAL); } @Override protected void onPause() { super.onPause(); sManager.unregisterListener(this); } @Override public void onSensorChanged(SensorEvent event) { count++; counter.setText("Count: "+count); float approx = event.values[0]; if(approx<2.0){ imageView.setImageResource(R.drawable.ic_action_favorite); }else{ imageView.setImageResource(R.drawable.ic_launcher); } } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } }

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/LinearLayout1"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    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="test.example.proximitysensoactivity.MainActivity" >    <TextView        android:id="@+id/textView1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:text="Proximity Sensor Fun"        android:textSize="25sp"        android:textStyle="bold"        android:typeface="serif" />    <TextView        android:id="@+id/sensor_counter"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:layout_marginTop="30dp"        android:text="Medium Text"        android:textAppearance="?android:attr/textAppearanceMedium" />    <ImageView        android:id="@+id/imageView1"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_margin="50dp"        android:layout_weight="1"        android:src="@drawable/ic_launcher" /> </LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="test.example.proximitysensoactivity"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="10"        android:targetSdkVersion="19" />        <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application> </manifest>