Android App Development ฉบับสมบูรณ์

import android.view.Window;
import android.view.WindowManager;
import android.view.SurfaceHolder.Callback;
public class SimpleBouncingBallActivity extends Activity implements Callback,
SensorListener {
private static final int BALL_RADIUS = 50;
private SurfaceView surface;
private SurfaceHolder holder;
private final Ball ball = new Ball(BALL_RADIUS);
private MyThread thread ;
private Paint backgroundPaint;
private Paint ballPaint;
private SensorManager sensorMgr;
private long lastSensorUpdate = -1;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(R.layout.main);
surface = (SurfaceView) findViewById(R.id.bouncing_ball_surface);
holder = surface.getHolder();
surface.getHolder().addCallback(this);
backgroundPaint = new Paint();
backgroundPaint.setColor(Color.WHITE);
}
ballPaint = new Paint();
ballPaint.setColor(Color.BLUE);
ballPaint.setAntiAlias(true);
protected void onPause() {
super.onPause();
}
ball.setVibrator(null);
sensorMgr.unregisterListener(this, SENSOR_ACCELEROMETER);
sensorMgr = null;
ball.setAccel(0, 0);
protected void onResume() {
super.onResume();
sensorMgr = (SensorManager) getSystemService(SENSOR_SERVICE);
boolean accelSupported = sensorMgr.registerListener(this,
SENSOR_ACCELEROMETER, SENSOR_DELAY_GAME);
}
if (!accelSupported) {
// on accelerometer on this device
sensorMgr.unregisterListener(this, SENSOR_ACCELEROMETER);
}
Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
ball.setVibrator(vibrator);
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Android App Development ฉบับสมบูรณ์