安卓欢迎页的写法

layout :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:background="#fff"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
   <ImageView


        android:id="@+id/imageView_welcome"


        android:layout_width="match_parent"


        android:layout_height="match_parent"


        android:src="@drawable/wellcom" />  


</LinearLayout>

java:

public class Wellcom extends Activity implements AnimationListener{
private ImageView  imageView = null;


    private Animation alphaAnimation = null;


    protected void onCreate(Bundle savedInstanceState) {


        // TODO Auto-generated method stub


        super.onCreate(savedInstanceState);


        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.wellcome);


        imageView = (ImageView)findViewById(R.id.imageView_welcome);


        alphaAnimation = AnimationUtils.loadAnimation(this, R.anim.welcom_alpha);


        alphaAnimation.setFillEnabled(true); //启动Fill保持


        alphaAnimation.setFillAfter(true);  //设置动画的最后一帧是保持在View上面


        imageView.setAnimation(alphaAnimation);


        alphaAnimation.setAnimationListener(this);  //为动画设置监听


    }
    




    public void onAnimationEnd(Animation animation) {


       //动画结束时结束欢迎界面并转到软件的主界面


       Intent intent = new Intent(this, Bluetoothoyl.class);


       startActivity(intent);


       this.finish();


   }


public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub

}


public void onAnimationStart(Animation animation) {
// TODO Auto-generated method stub

}
@Override


public boolean onKeyDown(int keyCode, KeyEvent event) {


   //在欢迎界面屏蔽BACK键,在退出的时候就不会返回这个欢迎页


   if(keyCode==KeyEvent.KEYCODE_BACK) {


     return false;


     }


   return false;


   }


}

anim:

<set xmlns:android="http://schemas.android.com/apk/res/android"


android:interpolator="@android:anim/accelerate_interpolator">


<alpha 


    android:fromAlpha="0.0"


    android:toAlpha="1.0"


    android:duration="500" 


/>


<alpha 


    android:fromAlpha="1.0"


    android:toAlpha="0.2"


    android:startOffset="1000"


    android:duration="300" 


/>


</set>