How to detect device power button press twice in android programmatically

Question

I am making an android application which needs to detect the event of device power button press twice/thrice & send an SMS in the background. The listener should run in the background (i.e even if my app is not open, it should detect the keypress event and act accordingly).

Below is my tried code which is not working...

My Code:

public class MyBroadCastReciever extends BroadcastReceiver {

     int Count=0;

     @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
               Count++;
               if(Count==2){
                  //Send SMS code..
                 }


            } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
                 //This is for screen ON option.
            }
        }

Manifest file:

  <application
       android:icon="@drawable/ic_launcher"
       android:label="@string/app_name"
       android:theme="@style/AppTheme" >


    <receiver android:name=".MyBroadCastReciever" >
        <intent-filter>
            <action android:name="android.intent.action.SCREEN_OFF" />
            <action android:name="android.intent.action.SCREEN_ON" />
        </intent-filter>
    </receiver>
</application>

Answer 1

This is something I have done,

short description : You just have to detect when the screen turn off and turns on calculate the time difference between them, if its less than 4 seconds(in my case) send the message else don't .

P.S- You can change the intervals of pressing of power buttons.

use it in your BroadcastReceiver:

@Override
public void onReceive(final Context context, final Intent intent) {
 cntx = context;
 vibe = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
 Log.v("onReceive", "Power button is pressed.");
 if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
  a = System.currentTimeMillis();
  seconds_screenoff = a;
  OLD_TIME = seconds_screenoff;
  OFF_SCREEN = true;

  new CountDownTimer(5000, 200) {

   public void onTick(long millisUntilFinished) {


    if (ON_SCREEN) {
     if (seconds_screenon != 0 && seconds_screenoff != 0) {

      actual_diff = cal_diff(seconds_screenon, seconds_screenoff);
      if (actual_diff <= 4000) {
       sent_msg = true;
       if (sent_msg) {

        Toast.makeText(cntx, "POWER BUTTON CLICKED 2 TIMES", Toast.LENGTH_LONG).show();
        vibe.vibrate(100);
        seconds_screenon = 0 L;
        seconds_screenoff = 0 L;
        sent_msg = false;

       }
      } else {
       seconds_screenon = 0 L;
       seconds_screenoff = 0 L;

      }
     }
    }
   }

   public void onFinish() {

    seconds_screenoff = 0 L;
   }
  }.start();



 } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
  a = System.currentTimeMillis();
  seconds_screenon = a;
  OLD_TIME = seconds_screenoff;

  new CountDownTimer(5000, 200) {

   public void onTick(long millisUntilFinished) {
    if (OFF_SCREEN) {
     if (seconds_screenon != 0 && seconds_screenoff != 0) {
      actual_diff = cal_diff(seconds_screenon, seconds_screenoff);
      if (actual_diff <= 4000) {
       sent_msg = true;
       if (sent_msg) {

        Toast.makeText(cntx, "POWER BUTTON CLICKED 2 TIMES", Toast.LENGTH_LONG).show();
        vibe.vibrate(100);
        seconds_screenon = 0 L;
        seconds_screenoff = 0 L;
        sent_msg = false;



       }
      } else {
       seconds_screenon = 0 L;
       seconds_screenoff = 0 L;

      }
     }
    }

   }

   public void onFinish() {

    seconds_screenon = 0 L;
   }
  }.start();



 }
}

private long cal_diff(long seconds_screenon2, long seconds_screenoff2) {
 if (seconds_screenon2 >= seconds_screenoff2) {
  diffrence = (seconds_screenon2) - (seconds_screenoff2);
  seconds_screenon2 = 0;
  seconds_screenoff2 = 0;
 } else {
  diffrence = (seconds_screenoff2) - (seconds_screenon2);
  seconds_screenon2 = 0;
  seconds_screenoff2 = 0;
 }

 return diffrence;
}

}

---

manifest.xml

<receiver android:name=".MyReceiver" >
   <intent-filter>
     <action android:name="android.intent.action.ACTION_SHUTDOWN" >
     </action>
   </intent-filter>
</receiver>

<service
   android:name=".MyService"
   android:exported="false" />

paste it in application tag

---

its works fine for me in background too

Answer 2

Here's the code I'm using to detect if the user is present, screen on/off.

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.userpresent"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />


    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.userpresent.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>

            <service android:name="com.example.userpresent.LockService" >
                <intent-filter>
                    <action android:name="android.intent.action.BOOT_COMPLETED" />
                </intent-filter>
            </service>
    </application>

</manifest>

MainActivity.java

package com.example.userpresent;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        startService(new Intent(getApplicationContext(), LockService.class));
    }
}

LockService.java

package com.example.userpresent;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Binder;
import android.os.IBinder;

public class LockService extends Service {

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        final IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_USER_PRESENT);
        final BroadcastReceiver mReceiver = new ScreenReceiver();
        registerReceiver(mReceiver, filter);
        return super.onStartCommand(intent, flags, startId);
    }
    public class LocalBinder extends Binder {
        LockService getService() {
            return LockService.this;
        }
    }
}

ScreenReceiver.java

package com.example.userpresent;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.util.Log;

public class ScreenReceiver extends BroadcastReceiver {

    public static boolean wasScreenOn = true;

    @Override
    public void onReceive(final Context context, final Intent intent) {
    Log.e("LOB","onReceive");
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            // do whatever you need to do here
            wasScreenOn = false;
            Log.e("LOB","wasScreenOn"+wasScreenOn);
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            // and do whatever you need to do here
            wasScreenOn = true;

        } else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT)){
            Log.e("LOB","userpresent");
            Log.e("LOB","wasScreenOn"+wasScreenOn);
            String url = "http://www.stackoverflow.com";
            Intent i = new Intent(Intent.ACTION_VIEW);
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            i.setData(Uri.parse(url)); 
            context.startActivity(i); 
        }
    }
}