Animation

public class AnimationTest extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);

		this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
				WindowManager.LayoutParams.FLAG_FULLSCREEN);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(new AnimationView(this));
	}
}

class AnimationView extends View implements AnimationListener {

	private static final String TAG = "Gao";
	private Paint mPaint;
	private Bitmap mBitmap;
	private Animation mAlphaAnimation;
	private Animation mScaleAnimation;
	private Animation mTranslateAnimation;
	private Animation mRotateAnimation;

	public AnimationView(Context context) {
		super(context);

		mPaint = new Paint();
		mPaint.setColor(Color.WHITE);
		mPaint.setAntiAlias(true);
		mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);
		setFocusable(true);
	}

	@Override
	protected void onDraw(Canvas canvas) {
		// TODO Auto-generated method stub
		super.onDraw(canvas);
		canvas.drawColor(Color.BLACK);
		canvas.drawText("方向键↑ 渐变透明度动画效果", 80, this.getHeight() - 80, mPaint);
		canvas.drawText("方向键↓ 渐变尺寸伸缩动画效果", 80, this.getHeight() - 60, mPaint);
		canvas.drawText("方向键← 画面转换位置移动动画效果", 80, this.getHeight() - 40, mPaint);
		canvas.drawText("方向键→ 画面转移旋转动画效果", 80, this.getHeight() - 20, mPaint);
		canvas.drawBitmap(mBitmap,this.getWidth() / 2 - mBitmap.getWidth() / 2, this.getHeight()/ 2 - mBitmap.getHeight() / 2, mPaint);
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		switch (keyCode) {
		case KeyEvent.KEYCODE_DPAD_UP:
			startAlphaAnimation();
			break;
		case KeyEvent.KEYCODE_DPAD_DOWN:
			startScaleAnimation();
			break;
		case KeyEvent.KEYCODE_DPAD_LEFT:
			startTranslateAnimation();
			break;
		case KeyEvent.KEYCODE_DPAD_RIGHT:
			startRotateAnimation();
			break;

		default:
			break;
		}
		return super.onKeyDown(keyCode, event);
	}

	private void startRotateAnimation() {
		mRotateAnimation=new RotateAnimation(0.0f, 360.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
		mRotateAnimation.setAnimationListener(this);
		mRotateAnimation.setDuration(3000);
		this.startAnimation(mRotateAnimation);
	}

	private void startTranslateAnimation() {
		mTranslateAnimation=new TranslateAnimation(0.0f, 100.0f, 0.0f, 100.0f);
		mTranslateAnimation.setAnimationListener(this);
		mTranslateAnimation.setDuration(3000);
		this.startAnimation(mTranslateAnimation);
	}

	private void startScaleAnimation() {
		mScaleAnimation = new ScaleAnimation(0.0f, 2.0f, 1.5f, 1.5f, Animation.RELATIVE_TO_PARENT, 0.5f, Animation.RELATIVE_TO_PARENT, 0.0f);
		mScaleAnimation.setAnimationListener(this);
		mScaleAnimation.setDuration(3000);
		this.startAnimation(mScaleAnimation);
		
	}

	private void startAlphaAnimation() {
		mAlphaAnimation=new AlphaAnimation(0.1f, 1.0f);
		mAlphaAnimation.setAnimationListener(this);
		mAlphaAnimation.setDuration(3000);
		this.startAnimation(mAlphaAnimation);
	}

	@Override
	public void onAnimationEnd(android.view.animation.Animation animation) {
		// TODO Auto-generated method stub
		Log.i(TAG, "onAnimationEnd");
	}

	@Override
	public void onAnimationRepeat(android.view.animation.Animation animation) {
		// TODO Auto-generated method stub
		Log.i(TAG, "onAnimationRepeat");
	}

	@Override
	public void onAnimationStart(android.view.animation.Animation animation) {
		// TODO Auto-generated method stub
		Log.i(TAG, "onAnimationStart");
	}

}

canvas.drawBitmap(mBitmap,this.getWidth() / 2 - mBitmap.getWidth() / 2, this.getHeight()/ 2 - mBitmap.getHeight() / 2, mPaint);

这段代码可以让图片画在屏幕的正中间

每次启动一个Animation都会触发

I/Gao ( 569): onAnimationStart
I/Gao ( 569): onAnimationEnd