Compass sensor : Sensor « Hardware « Android

1. Android
2. Hardware
3. Sensor

Compass 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 compass;
    private TextView text;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mgr = (SensorManager) this.getSystemService(SENSOR_SERVICE);

        compass = mgr.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
        
        text = (TextView) findViewById(R.id.text);
    }

    @Override
    protected void onResume() {
        mgr.registerListener(this, compass, SensorManager.SENSOR_DELAY_NORMAL);
      super.onResume();
    }

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

  public void onAccuracyChanged(Sensor sensor, int accuracy) {

  }

  public void onSensorChanged(SensorEvent event) {
            String msg = String.format("X: %8.4f\nY: %8.4f\nZ: %8.4f",
              event.values[0], event.values[1], event.values[2]);
        text.setText(msg);
        text.invalidate();
  }
}

//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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