Gravity sensor : Sensor « Hardware « Android

1. Android
2. Hardware
3. Sensor

Gravity sensor

   

package app.test;

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;

public class Test extends Activity implements SensorEventListener {
    private SensorManager mgr;
    private Sensor accelerometer;
    private TextView text;
  private float[] gravity = new float[3];
  private float[] motion = new float[3];
  private double ratio;
  private double mAngle;
  private int counter = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mgr = (SensorManager) this.getSystemService(SENSOR_SERVICE);
        accelerometer = mgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        text = (TextView) findViewById(R.id.text);
    }
    @Override
    protected void onResume() {
        mgr.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_UI);
      super.onResume();
    }

    @Override
    protected void onPause() {
        mgr.unregisterListener(this, accelerometer);
      super.onPause();
    }

  public void onAccuracyChanged(Sensor sensor, int accuracy) {
  }

  public void onSensorChanged(SensorEvent event) {
    for(int i=0; i<3; i++) {
            gravity [i] = (float) (0.1 * event.values[i] + 0.9 * gravity[i]);
            motion[i] = event.values[i] - gravity[i];
    }
      ratio = gravity[1]/SensorManager.GRAVITY_EARTH;
      if(ratio > 1.0) ratio = 1.0;
      if(ratio < -1.0) ratio = -1.0;
      mAngle = Math.toDegrees(Math.acos(ratio));
      if(gravity[2] < 0) {
        mAngle = -mAngle;
      }
      if(counter++ % 10 == 0) {
            String msg = String.format(
                "Raw values\nX: %8.4f\nY: %8.4f\nZ: %8.4f\n" +
          "Gravity\nX: %8.4f\nY: %8.4f\nZ: %8.4f\n" +
          "Motion\nX: %8.4f\nY: %8.4f\nZ: %8.4f\nAngle: %8.1f",
              event.values[0], event.values[1], event.values[2],
              gravity[0], gravity[1], gravity[2],
              motion[0], motion[1], motion[2],
              mAngle);
        text.setText(msg);
        text.invalidate();
        counter=1;
      }
  }
}

//main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"  android:layout_height="fill_parent" >
  <TextView  android:id="@+id/text" android:textSize="20sp"
    android:layout_width="fill_parent"  android:layout_height="wrap_content" />
</LinearLayout>

   
    
    
  

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