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POSensor Reading keeps increasing even after closing app, Android
 

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  1. POSensor Reading keeps increasing even after closing app, Android
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    <p>I have make this app which calculates Linear Acceleration of device of all dimension, combines it, and calculates net acceleration. Top five acceleration values are stored in Shared Preference key-value pairs.</p> <p>The problem is when I close the app and reopen it, I find the values increased to a much higher level. I don't seem to catch the point in the code from where it is happening. </p> <p>Please Help me out.</p> <p>ShakoMeter.java (this is my main activity where all sensor data is collected and stored)</p> <pre><code>package com.example.shake_o_meter; import java.text.DecimalFormat; import java.util.ArrayList; import java.util.Collections; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.graphics.Color; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.os.Handler; import android.preference.PreferenceManager; import android.view.Gravity; import android.view.Menu; import android.view.View; import android.widget.TextView; import android.widget.Toast; public class ShakeOMeter extends Activity implements SensorEventListener{ float ro(double ax2) { DecimalFormat df = new DecimalFormat("#.###"); return Float.valueOf(df.format(ax2)); } SensorManager smngr; Sensor sen; TextView t,t3; double max=-1; double ax = 0,ay = 0,az = 0; SharedPreferences sharedPref; SharedPreferences.Editor editor; ArrayList&lt;Float&gt; list; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_shake_ometer); t = (TextView)findViewById(R.id.TextView1); // Showing initial message TextView textview = new TextView(getApplicationContext()); textview.setText("Get ready to Shake It!!"); textview.setBackgroundColor(Color.BLACK); textview.setTextColor(Color.WHITE); textview.setTextSize(30); textview.setPadding(10,10,10,10); textview.setGravity(Gravity.CENTER_VERTICAL); Toast toast = new Toast(getApplicationContext()); toast.setView(textview); toast.setDuration(Toast.LENGTH_SHORT); toast.setGravity(Gravity.FILL, 0, 0); toast.show(); //Getting Sensor Control smngr = (SensorManager) getSystemService(Context.SENSOR_SERVICE); sen = (Sensor) smngr.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION); //Obtaining SharedPreferance for storing key-value pairs of high scores. sharedPref = PreferenceManager.getDefaultSharedPreferences(this); editor = sharedPref.edit(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.shake_ometer, menu); return true; } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } @Override public void onSensorChanged(SensorEvent event) { list = new ArrayList&lt;Float&gt;(); ax = event.values[0]; ay = event.values[1]; az = event.values[2]; double temp=Math.sqrt(ro(ax)*ro(ax)+ro(ay)*ro(ay)+ro(az)*ro(az)); if(temp&gt;=max){ max=temp; t.setText(ro(max)+""); list.add(sharedPref.getFloat("1", 0)); list.add(sharedPref.getFloat("2", 0)); list.add(sharedPref.getFloat("3", 0)); list.add(sharedPref.getFloat("4", 0)); list.add(sharedPref.getFloat("5", 0)); if(max&gt;list.get(0)){ list.remove(0); list.add((float) max); Collections.sort(list); editor.putFloat("1", list.get(0)); editor.putFloat("2", list.get(1)); editor.putFloat("3", list.get(2)); editor.putFloat("4", list.get(3)); editor.putFloat("5", list.get(4)); editor.commit(); System.out.println(sharedPref.getFloat("5", 0)+" " +sharedPref.getFloat("4", 0)+" " +sharedPref.getFloat("3", 0)+" " +sharedPref.getFloat("2", 0)+" " +sharedPref.getFloat("1", 0)); } } } public void onClickReset(View view){ Intent intent = getIntent(); finish(); startActivity(intent); } public void onClickTopFive(View view){ Intent intent = new Intent(getApplicationContext(),TopFive.class); startActivity(intent); } @Override protected void onResume(){ super.onResume(); final ShakeOMeter sh = this; final Handler handler = new Handler(); handler.postDelayed(new Runnable() { @Override public void run() { // Do something after 5s = 5000ms smngr.registerListener(sh, sen, SensorManager.SENSOR_DELAY_NORMAL); } },3000); } @Override protected void onPause() { super.onPause(); smngr.unregisterListener(this); } protected void onStop(){ super.onStop(); smngr.unregisterListener(this); } public void onDestroy(){ super.onDestroy(); smngr.unregisterListener(this); finish(); } } </code></pre> <p>TopFive.java (This is a sub Activity where top five activities are displayed)</p> <pre><code>package com.example.shake_o_meter; import java.text.DecimalFormat; import android.annotation.TargetApi; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.os.Build; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.NavUtils; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.TextView; public class TopFive extends Activity { float ro(double ax2) { DecimalFormat df = new DecimalFormat("#.###"); return Float.valueOf(df.format(ax2)); } SharedPreferences sharedPref; SharedPreferences.Editor edit; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_top_five); // Show the Up button in the action bar. setupActionBar(); TextView t1 = (TextView) findViewById(R.id.T1); TextView t2 = (TextView) findViewById(R.id.T2); TextView t3 = (TextView) findViewById(R.id.T3); TextView t4 = (TextView) findViewById(R.id.T4); TextView t5 = (TextView) findViewById(R.id.T5); sharedPref = PreferenceManager.getDefaultSharedPreferences(this); edit = sharedPref.edit(); t1.setText(ro(sharedPref.getFloat("1", 0))+""); t2.setText(ro(sharedPref.getFloat("2", 0))+""); t3.setText(ro(sharedPref.getFloat("3", 0))+""); t4.setText(ro(sharedPref.getFloat("4", 0))+""); t5.setText(ro(sharedPref.getFloat("5", 0))+""); } public void onClickReset(View view){ edit.putFloat("1", 0);edit.commit(); edit.putFloat("2", 0);edit.commit(); edit.putFloat("3", 0);edit.commit(); edit.putFloat("4", 0);edit.commit(); edit.putFloat("5", 0);edit.commit(); Intent intent = getIntent(); finish(); startActivity(intent); } /** * Set up the {@link android.app.ActionBar}, if the API is available. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB) private void setupActionBar() { if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.HONEYCOMB) { getActionBar().setDisplayHomeAsUpEnabled(true); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.top_five, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: // This ID represents the Home or Up button. In the case of this // activity, the Up button is shown. Use NavUtils to allow users // to navigate up one level in the application structure. For // more details, see the Navigation pattern on Android Design: // // http://developer.android.com/design/patterns/navigation.html#up-vs-back // NavUtils.navigateUpFromSameTask(this); return true; } return super.onOptionsItemSelected(item); } } </code></pre>
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    1. CODon't know what's causing your problem. But in either case I'd put Sensor listening to a Service.
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      1. POSensor Reading keeps increasing even after closing app, Android
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    2. COso, do I need to create a service and attach it to the activity? would that solve my problem?
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      1. POSensor Reading keeps increasing even after closing app, Android
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    3. COOnly putting the same code to a service wouldn't solve your problem, because Android programming is always solving a long chain of problems ;-)
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      1. POSensor Reading keeps increasing even after closing app, Android
      1. UShgoebl
 

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