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POMoving an image using Accelerometer of android
 

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    <p>I have read articles/tutorial about accessing the phone's accelerometer (acceleration and orientation) values. I am trying to build a simple app where I can move a ball image using the these values. Here is my code:</p> <pre><code>import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.drawable.ShapeDrawable; import android.graphics.drawable.shapes.OvalShape; 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 Accelerometer extends Activity implements SensorEventListener { /** Called when the activity is first created. */ CustomDrawableView mCustomDrawableView = null; ShapeDrawable mDrawable = new ShapeDrawable(); int x ; int y ; private SensorManager sensorManager = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Get a reference to a SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); mCustomDrawableView = new CustomDrawableView(this); setContentView(mCustomDrawableView); // setContentView(R.layout.main); } // This method will update the UI on new sensor events public void onSensorChanged(SensorEvent sensorEvent) { { if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER) { int someNumber = 100; float xChange = someNumber * sensorEvent.values[1]; //values[2] can be -90 to 90 float yChange = someNumber * 2 * sensorEvent.values[2]; x = x + (int)xChange; y = y + (int)yChange; } if (sensorEvent.sensor.getType() == Sensor.TYPE_ORIENTATION) { } } } // I've chosen to not implement this method public void onAccuracyChanged(Sensor arg0, int arg1) { // TODO Auto-generated method stub } @Override protected void onResume() { super.onResume(); // Register this class as a listener for the accelerometer sensor sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL); // ...and the orientation sensor sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_NORMAL); } @Override protected void onStop() { // Unregister the listener sensorManager.unregisterListener(this); super.onStop(); } public class CustomDrawableView extends View { public CustomDrawableView(Context context) { super(context); int width = 50; int height = 50; mDrawable = new ShapeDrawable(new OvalShape()); mDrawable.getPaint().setColor(0xff74AC23); mDrawable.setBounds(x, y, x + width, y + height); } protected void onDraw(Canvas canvas) { mDrawable.draw(canvas); invalidate(); } } } </code></pre> <p>I am getting an oval shape displayed on the screen but nothing happens after that.</p> <p>thanks</p>
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    1. USsankara rao bhatta
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    1. COIn your onDraw you aren't doing anything to move your shape. You should add code in there that sets the location of your drawable (from the X,Y values you are storing)
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    2. COhow do i do it.. can you give me some sample code
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    3. COTry putting this in your onDraw method "RectF oval = new RectF(Accelerometer.x, Accelerometer.y, Accelerometer.x + width, Accelerometer.y + height); //set bounds of rectangle Paint p = new Paint(); //set some paint options canvas.drawOval(oval, p);" You'll need to make your X and Y variables public members and your width / height will need to be static values in your CustomDrawableView class.
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