Monitor the Proximity Sensor

Proximity sensor measures the distance that some object is from the device. It is often used to detect the presence of a person’s face next to the device.



Some proximity sensors only support a binary near or far measurement. In this case, the sensor should report its maximum range value in the far state and a lesser value in the near state.

package com.exercise.AndroidProximitySensor;

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 AndroidProximitySensorActivity extends Activity {
    /** Called when the activity is first created. */
 
 TextView ProximitySensor, ProximityMax, ProximityReading;
 
 SensorManager mySensorManager;
 Sensor myProximitySensor;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ProximitySensor = (TextView)findViewById(R.id.proximitySensor);
        ProximityMax = (TextView)findViewById(R.id.proximityMax);
        ProximityReading = (TextView)findViewById(R.id.proximityReading);
        
        mySensorManager = (SensorManager)getSystemService(
          Context.SENSOR_SERVICE);
        myProximitySensor = mySensorManager.getDefaultSensor(
          Sensor.TYPE_PROXIMITY);
        
        if (myProximitySensor == null){
         ProximitySensor.setText("No Proximity Sensor!"); 
        }else{
         ProximitySensor.setText(myProximitySensor.getName());
         ProximityMax.setText("Maximum Range: "
           + String.valueOf(myProximitySensor.getMaximumRange()));
         mySensorManager.registerListener(proximitySensorEventListener,
           myProximitySensor,
           SensorManager.SENSOR_DELAY_NORMAL);
        }
    }
    
    SensorEventListener proximitySensorEventListener
    = new SensorEventListener(){

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
   // TODO Auto-generated method stub
   
  }

  @Override
  public void onSensorChanged(SensorEvent event) {
   // TODO Auto-generated method stub

   if(event.sensor.getType()==Sensor.TYPE_PROXIMITY){
    ProximityReading.setText("Proximity Sensor Reading:"
      + String.valueOf(event.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/proximitySensor"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
    android:id="@+id/proximityMax"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
    android:id="@+id/proximityReading"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>

Download the files.

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