重力小球

package com.android.mypro;import android.R.integer;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class GBall extends SurfaceView implements Callback, Runnable,SensorEventListener {private static final int TIME_IN_FRAME = 50;private Paint ballPaint = null;private SurfaceHolder surfaceHolder = null;private boolean running = false;private Canvas canvas = null;private SensorManager mSensorManager = null;private Sensor sensor = null;private int mWidth = 0;private int mHeight = 0;private int cx = 100;private int cy = 100;private int radius = 30;private float gx = 0;private float gy = 0;private float gz = 0;private Thread thread = null;private static final String TAG = "GBall";public GBall(Context context, SensorManager sensorManager) {super(context);// TODO Auto-generated constructor stub// get surfaceHoldersurfaceHolder = this.getHolder();// add callback functionsurfaceHolder.addCallback(this);// init paintballPaint = new Paint();ballPaint.setAntiAlias(true);ballPaint.setColor(Color.BLACK);thread = new Thread(this);mSensorManager = sensorManager;sensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);mSensorManager.registerListener(this, sensor,SensorManager.SENSOR_DELAY_GAME);}public void unregisterSensor() {mSensorManager.unregisterListener(this);}public void stopThread() {try {this.running = false;thread.join();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}private void revise() {if (cx <= radius) {cx = radius;sx = -sx/2;} else if (cx >= (mWidth - radius)) {cx = mWidth - radius;sx = -sx/2;}if (cy <= radius) {cy = radius;sy = -sy/2;} else if (cy >= (mHeight - radius)) {cy = mHeight - radius;sy = -sy/2;}}protected void myDraw() {canvas = surfaceHolder.lockCanvas();// set screen to whitecanvas.drawColor(Color.WHITE);revise();canvas.drawCircle(cx, cy, radius, ballPaint);surfaceHolder.unlockCanvasAndPost(canvas);}private int sx = 0;private int sy = 0;public void run() {// TODO Auto-generated method stubwhile(running) {cx = cx + sx;cy = cy + sy;myDraw();try {Thread.sleep(20);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stubLog.d(TAG, "surfaceChanged");}public void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stubLog.d(TAG, "surfaceCreated");mWidth = getWidth();mHeight = getHeight();//+++++set background to whitecanvas = surfaceHolder.lockCanvas();canvas.drawColor(Color.WHITE);surfaceHolder.unlockCanvasAndPost(canvas);//-----running = true;thread.start();}public void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stubLog.d(TAG, "surfaceDestroyed");stopThread();unregisterSensor();}public void onAccuracyChanged(Sensor sensor, int accuracy) {// TODO Auto-generated method stub}public void onSensorChanged(SensorEvent event) {// TODO Auto-generated method stubgx = event.values[SensorManager.DATA_X];gy = event.values[SensorManager.DATA_Y];gz = event.values[SensorManager.DATA_Z];sx += -(int)gx/2;sy += (int)gy/2;//Log.d(TAG, "" + gx + " " + gy + " " + gz);}}