Workshops

package tk.pixilab.android;
 
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.ImageView;
 
public class CompassAppActivity extends Activity implements SensorEventListener {
 
	private SensorManager sensorManager;
	private Sensor sensor;
 
	private Matrix matrix;
	private ImageView iv_compass;
	private Bitmap bitmap, rot_bitmap;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
 
        sensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
        sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
        sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_GAME);
 
        iv_compass = (ImageView)findViewById(R.id.main_iv_compass);
        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.compass_nadel);
        matrix = new Matrix();
    }
 
	@Override
	public void onAccuracyChanged(Sensor sensor, int accuracy) {
		// TODO Auto-generated method stub
 
	}
 
	@Override
	public void onSensorChanged(SensorEvent event) {
		if(event.sensor == sensor) {
			int winkel = (int)event.values[0];
			int swinkel = -winkel+(winkel>180?360:0);
 
			matrix.setRotate(swinkel);
			rot_bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
			iv_compass.setImageBitmap(rot_bitmap);
		}
 
	}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FFFFFF"
    >
	<ImageView
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:src="@drawable/compass"
	    android:layout_centerInParent="true"
	    />
	<ImageView
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:src="@drawable/compass_nadel"
	    android:layout_centerInParent="true"
	    android:id="@+id/main_iv_compass"
	    />
</RelativeLayout>