How to implement Back button functionality in android

Question

I want to implement back button functionality without pressing any hard keys. For example using proximity sensor. when any object comes to near to proximity I want to get previous activity. How to implement this in android is it possible ?. my code is like this :

SensorEventListener accelerometerSensorEventListener
        = new SensorEventListener(){

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

            }

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

                if(event.sensor.getType()==Sensor.TYPE_ACCELEROMETER){              

                     finish();                  
                }

            }

     };

Thanks in advance

Sanket · Accepted Answer · 2016-12-01 00:07:51Z

2

You can use

//On Back Pressed 

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
        // do something on back.
        return true;
    }
    return super.onKeyDown(keyCode, event);
}strong text

edited Dec 1, 2016 at 0:07

user6613600

answered Mar 29, 2012 at 22:14

Sanket

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Comments

Ronak Mehta · Accepted Answer · 2012-03-29 18:57:11Z

1

You can use

@Override
public void onBackPressed() 
{
    Log.d("CDA", "onBackPressed Called"); 
}

or

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  {
  if (keyCode == KeyEvent.KEYCODE_BACK) {
    // do something on back.
    return true;
}
   return super.onKeyDown(keyCode, event);
}

answered Mar 29, 2012 at 18:57

Ronak Mehta

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Comments

guness · Accepted Answer · 2012-03-29 16:28:48Z

0

inside the listener of the sensor, you may finish() the current activity. so it goes back to the caller activity.

answered Mar 29, 2012 at 16:28

guness

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2 Comments

Prasad Over a year ago

Yes I tried it but it is not working. I will edit and post my code plz check it

guness Over a year ago

can you try this: Intent i = new Intent(CurrentActivity.this, CallerActivity.class); i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(i);

biegleux · Accepted Answer · 2012-03-29 16:30:00Z

0

You can call onBackPressed().

answered Mar 29, 2012 at 16:30

biegleux

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1 Comment

biegleux Over a year ago

Have you registered your listener?

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