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PObackground sensing of shake and GPS problems
 

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    <p>MainAcivity.java</p> <pre><code> package com.example.background_shake; import java.util.List; import java.util.Locale; import android.app.Activity; import android.content.Intent; import android.hardware.SensorManager; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.view.WindowManager; import android.widget.Button; public class MainActivity extends Activity implements OnClickListener { Button ON,OFF; private SensorManager sensorManager; private long lastUpdate; Intent i1; public static final String TAG = "ServicesDemo"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); //reseting the window propertys getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); //super method super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ON=(Button)findViewById(R.id.ON); OFF=(Button)findViewById(R.id.OFF); ON.setOnClickListener(this); OFF.setOnClickListener(this); } public void onClick(View src) { switch (src.getId()) { case R.id.ON: Log.d(TAG, "onClick: starting srvice"); startService(new Intent(this, Background_service.class)); break; case R.id.OFF: Log.d(TAG, "onClick: stopping srvice"); stopService(new Intent(this, Background_service.class)); break; } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } } </code></pre> <p>Background_service.java</p> <pre><code> package com.example.background_shake; import java.util.List; import java.util.Locale; import android.app.Service; import android.content.Intent; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.location.Address; import android.location.Geocoder; import android.os.IBinder; import android.util.Log; import android.widget.Toast; public class Background_service extends Service implements SensorEventListener{ boolean flag=false; private long lastUpdate; SensorManager sensorManager; int count=0; @Override public IBinder onBind(Intent intent) { return null; } public void onCreate() { flag=true; Log.d(MainActivity.TAG, "onCreate"); super.onCreate(); } public void onDestroy() { flag=false; Log.d(MainActivity.TAG, "onDestroy"); super.onDestroy(); } public void onStart(Intent intent, int startId) { sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL); lastUpdate = System.currentTimeMillis(); } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } private void getAccelerometer(SensorEvent event) { if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) { float[] values = event.values; // Movement float x = values[0]; float y = values[1]; float z = values[2]; double latitude=0; double longitude=0; String location_message; GPSTracker gps; float accelationSquareRoot = (x * x + y * y + z * z) / (SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH); long actualTime = System.currentTimeMillis(); if (accelationSquareRoot &gt;= 2) // { if (actualTime - lastUpdate &lt; 2000) { count++; return; } lastUpdate = actualTime; { gps=new GPSTracker(Background_service.this); if((gps.canGetLocation())&amp;&amp;(count==3)){ count=0; latitude = gps.getLatitude(); longitude = gps.getLongitude(); // \n is for new line // Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show(); Geocoder gcd = new Geocoder(Background_service.this, Locale.getDefault()); try{ List&lt;Address&gt; addresses = gcd.getFromLocation(latitude, longitude, 1); location_message= addresses.get(0).getLocality(); if ((addresses.size() &gt; 0)&amp;&amp;(flag)) { Toast.makeText(getApplicationContext(), "Your Location is " +addresses.get(0).getLocality() , Toast.LENGTH_LONG).show(); count=0; } }catch(Exception e) { System.out.print(e); } }else{ // can't get location // GPS or Network is not enabled // Ask user to enable GPS/network in settings Toast.makeText(getApplicationContext(), "Switch on gps" , Toast.LENGTH_LONG).show(); gps.showSettingsAlert(); }} /*Toast.makeText(this, "Device was shuffed", Toast.LENGTH_SHORT) .show(); if (color) { view.setBackgroundColor(Color.GREEN); } else { view.setBackgroundColor(Color.RED); }*/ }} } public void onSensorChanged(SensorEvent event) { getAccelerometer(event); } protected void onResume() { //super.onResume(); // register this class as a listener for the orientation and // accelerometer sensors sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL); } protected void onPause() { // unregister listener sensorManager.unregisterListener(this); } </code></pre> <p>}</p> <p>The above code is for an app that senses the shake parameter and gives you the current location. But the problem is even though my GPS is off i am getting my current location.</p> <p>Also i want to know two things 1. Does a Service work even if you lock your phone?If no, what modifications must be made to my code so that it works? 2. My app gives the output if i shake my mobile once but i want my app to give the desired result only if i shake it continuously for 3-4 times.Is it possible to do that?</p>
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