// Acceleration - print accelerometer values 
// (c) Tero Karvinen & Kimmo Karvinen http://BotBook.com
 
package fi.sulautetut.android.acceleration;
 
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.TextView;
 
public class Acceleration 
    extends Activity 
    implements SensorEventListener 
{
    TextView statusTv; 
    TextView messagesTv;
    SensorManager sensorManager;
    Sensor sensor;
    float g=9.81f; // m/s**2 
    float x, y, z; // gravity along axis, times earth gravity 
 
    /*** Main - automatically called methods ***/
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initGUI();
    }
 
    @Override
    public void onResume() 
    {
        super.onResume(); 
        initAccel(); 
        msg("Running. ");
    } 
 
    @Override
    public void onPause() {
        super.onPause();
        closeAccel(); 
        msg("Paused. \n");
    }
 
    @Override
    public void onSensorChanged(SensorEvent event) { 
        x=event.values[1]/g;    // earth gravity along axis results 1.0
        y=event.values[2]/g;
        z=event.values[0]/g;
        statusTv.setText(String.format( 
                "x: %3.2f y: %3.2f, z: %3.2f", 
                x, y, z));
    }
 
    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // Must have when Activity implements SensorEventListener. 
    }
 
 
 
    /*** Accelerometer ***/
 
    void initAccel()
    {
        msg("Accelerometer initialization... ");
        sensorManager=(SensorManager) getSystemService(SENSOR_SERVICE); 
        sensor=sensorManager.getDefaultSensor( 
                Sensor.TYPE_ACCELEROMETER);
        sensorManager.registerListener(
                this, 
                sensor, 
                sensorManager.SENSOR_DELAY_NORMAL );
    }
 
    void closeAccel()
    {
        msg("Accelerometer closing... ");
        sensorManager.unregisterListener(this, sensor);
    }
 
 
 
    /*** User interface ***/
 
    void initGUI()
    {
        // Window
        setRequestedOrientation(
                ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        getWindow().setFlags(
                WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, 
                WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        // Contents 
        LinearLayout container=new LinearLayout(this);
        container.setOrientation(android.widget.LinearLayout.VERTICAL);
        statusTv = new TextView(this);
        container.addView(statusTv);
        messagesTv = new TextView(this);
        messagesTv.setText("");
        container.addView(messagesTv);
        setContentView(container); 
        msg("User interface created. ");
    }
 
    public void msg(String s)
    {
        if (7<=messagesTv.getLineCount()) messagesTv.setText(""); 
        messagesTv.append(s);
    }
}