AccelerometerActivity.java

package com.google.mcommerce.sample.android.chapter08.sensor;

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

import com.google.mcommerce.sample.android.R;

public class AccelerometerActivity extends Activity implements
		SensorEventListener {
	private SensorManager mgr;
	private Sensor accelerometer;
	private TextView text;
	private int mRotation;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.c08_sensor_accelerometer);

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

		accelerometer = mgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

		text = (TextView) findViewById(R.id.text);

		WindowManager window = (WindowManager) this
				.getSystemService(WINDOW_SERVICE);
		int apiLevel = Integer.parseInt(Build.VERSION.SDK);
		// Toast.makeText(this, "API level is " + apiLevel,
		// Toast.LENGTH_LONG).show();
		if (apiLevel < 8) {
			mRotation = window.getDefaultDisplay().getOrientation();
		} else {
			mRotation = window.getDefaultDisplay().getRotation();
		}
	}

	@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) {
		// ignore
	}

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