AB Shakerdemo

gistfile1.java

package ch.chrisii;

import java.util.List;


import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class AB_ShakerDemoActivity extends Activity implements SensorEventListener{
    
	private SensorManager sensorManager;
	private Sensor accelerator;
	private boolean initialized;
	private float lastX;
	private float lastY;
	private float lastZ;
	private final float NOISE = (float) 1.0;
	private View background;
	
	/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //wichtig sensorManager erst in Oncreate() methode instanzieren
        //sonst exception dass der SensorService noch nicht verfügbar ist
        sensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
        //ueber den SensorManager denn accelerometer holen
        accelerator = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        setContentView(R.layout.main);
        background = findViewById(R.id.colorpanel);
        
        //Liste aller Sensoren holen.
        List<Sensor> sensorList = sensorManager.getSensorList(Sensor.TYPE_ALL);
        //Text generieren für Textview
        StringBuilder text = new StringBuilder();
        for(int i=0; i<sensorList.size(); i++){
         text.append(sensorList.get(i).getName());
         text.append("\n");
        }
        //Text setzten
        TextView textView = (TextView)findViewById(R.id.sensors_text);
        textView.setText(text);
        //initialisiert
        initialized = false;
    }

	/* (non-Javadoc)
	 * @see android.app.Activity#onPause()
	 */
	@Override
	protected void onPause() {
		super.onPause();
		//unregister sensor
		sensorManager.unregisterListener(this);
	}

	/* (non-Javadoc)
	 * @see android.app.Activity#onResume()
	 */
	@Override
	protected void onResume() {
		super.onResume();
		//register sensor
		sensorManager.registerListener(this, accelerator, SensorManager.SENSOR_DELAY_NORMAL);
	}

	@Override
	public void onAccuracyChanged(Sensor sensor, int accuracy) {
		// can be safely ingored for this demo
	}

	@Override
	public void onSensorChanged(SensorEvent event) {
		float x = event.values[0];
		float y = event.values[1];
		float z = event.values[2];
		if (!initialized) {
			lastX = x;
			lastY = y;
			lastZ = z;
			initialized=true;
		}else{
			float deltaX = Math.abs(lastX - x);
			float deltaY = Math.abs(lastY - y);
			float deltaZ = Math.abs(lastZ - z);
			if (deltaX < NOISE) deltaX = (float)0.0;
			if (deltaY < NOISE) deltaY = (float)0.0;
			if (deltaZ < NOISE) deltaZ = (float)0.0;
			lastX = x;
			lastY = y;
			lastZ = z;
			if (deltaX > 2 && deltaY > 2){
				background.setBackgroundColor(Color.GREEN);
			}else{
				background.setBackgroundColor(Color.RED);
			}
		}
	}
}