ImageView淡入淡出成效

ImageView淡入淡出效果

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public class FadeInAndOut extends Activity {private int intCounter = 0;private Handler mHandler = new Handler();private ImageView mImageView01;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.fade_in_out);mImageView01 = (ImageView) findViewById(R.id.imageView1);mImageView01.setImageResource(R.drawable.img1);mImageView01.setAlpha(0);mHandler.post(fadeInTask);}/* 设定ImageView的透明度渐显出来 */private Runnable fadeInTask = new Runnable() {public void run() {intCounter = intCounter + 1;mImageView01.setAlpha(intCounter * 15);if(intCounter == 17)mHandler.postDelayed(fadeOutTask, 50);else mHandler.postDelayed(fadeInTask, 50);}};/* 设定ImageView的透明度渐暗下去 */private Runnable fadeOutTask = new Runnable() {public void run() {intCounter = intCounter - 1;mImageView01.setAlpha(intCounter * 15);if(intCounter == 0)mHandler.postDelayed(fadeInTask, 50);else mHandler.postDelayed(fadeOutTask, 50);}};}