Android Open Source - android-accelerometer-gps Calibration Activity

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Back to project page android-accelerometer-gps.

License

The source code is released under:

MIT License

Java Source Code

package com.szlosek.whenmoving;
// w ww .  j av a2  s  . com
import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;




public class CalibrationActivity extends Activity implements AdapterView.OnItemSelectedListener, SensorEventListener {
  private TextView mStatus;
  private ArrayAdapter<CharSequence> mAdapter;
  private Spinner mThreshold;
  private SensorManager mSensorManager;
  private int iAccelReadings, iAccelSignificantReadings;
  private long iAccelTimestamp;
  private SharedPreferences sp;

  @Override
  protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.calibration_activity);
    
    /*
    setContentView(R.layout.calibration_activity);
    mThreshold = (MapView) findViewById(R.id.calibration_threshold);
    
    mThreshold.setMinValue(1);
    mThreshold.setMaxValue(100);
    */
    
    sp = PreferenceManager.getDefaultSharedPreferences(MainApplication.getInstance());
    mStatus = (TextView) findViewById(R.id.calibration_status);
    
    Spinner spinner = (Spinner) findViewById(R.id.calibration_threshold);
    if (spinner == null) return;
    // Create an ArrayAdapter using the string array and a default spinner layout
    mAdapter = ArrayAdapter.createFromResource(
      this,
      R.array.pref_thresholdValues,
      android.R.layout.simple_spinner_item
    );
    // Specify the layout to use when the list of choices appears
    mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    // Apply the adapter to the spinner
    spinner.setAdapter(mAdapter);
    spinner.setOnItemSelectedListener(this);
  }
  
  @Override
  protected void onResume() {
    super.onResume();
    Spinner spinner = (Spinner) findViewById(R.id.calibration_threshold);
    String threshold = sp.getString("pref_threshold", "0.30");
    CharSequence threshold2 = threshold.subSequence(0, threshold.length() );
    Log.d("WM", String.format("pos %d", mAdapter.getPosition( threshold2 ) ) );
    spinner.setSelection( mAdapter.getPosition( threshold2 ) );
    
    startAccelerometer();
  }
  
  @Override
  protected void onPause() {
    super.onPause();
    stopAccelerometer();
  }
  
  @Override
  protected void onDestroy() {
    super.onDestroy();
  }
  
  @Override
  public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
    // An item was selected. You can retrieve the selected item using
    String s;
    String threshold;
    SharedPreferences.Editor spe;
    
    s = (String) parent.getItemAtPosition(pos);
    threshold = s.substring(0,4);

    spe = sp.edit();
    spe.putString("pref_threshold", threshold);
    spe.commit();
    
    MainApplication.onPreferenceChange();
    }
  public void onNothingSelected(AdapterView<?> parent) {
        // Another interface callback
    }
  
  
  
  public void startAccelerometer() {
    iAccelReadings = 0;
    iAccelSignificantReadings = 0;
    iAccelTimestamp = System.currentTimeMillis();
    // should probably store handles to these earlier, when service is created
    mSensorManager = (SensorManager) getSystemService(this.SENSOR_SERVICE);
    Sensor mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
  }

  public void stopAccelerometer() {
    mSensorManager.unregisterListener(this);
  }

  @Override
  public void onSensorChanged(SensorEvent event) {
    double accel, x, y, z;
    if (event.sensor.getType() != Sensor.TYPE_ACCELEROMETER) {
      return;
    }

    iAccelReadings++;
    x = event.values[0];
    y = event.values[1];
    z = event.values[2];
    
    accel = Math.abs(
      Math.sqrt(
        Math.pow(x,2)
        +
        Math.pow(y,2)
        +
        Math.pow(z,2)
      )
    );
    if (accel > MainApplication.prefThreshold2) {
      iAccelSignificantReadings++;
    }
    
    //Log.d("When", String.format("event: %f %f %f %f %f", x, y, z, accel, 0.600));
    
    // Get readings for 2 seconds
    if ( (System.currentTimeMillis() - iAccelTimestamp) < 2000) return;
    
    // Appeared to be moving 30% of the time?
    // If the bar is this low, why not report motion at the first significant reading and be done with it?
    if (((1.0*iAccelSignificantReadings) / iAccelReadings) > 0.30) {
      mStatus.setText("Moving");
      
      
    } else {
      mStatus.setText("Stationary");
     }
    iAccelTimestamp = System.currentTimeMillis();
    iAccelReadings = 0;
    iAccelSignificantReadings = 0;
  }
  
  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // can be safely ignored
  }
}

Java Source Code List

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