android欢迎界面动画加载

欢迎界面 WelcomeActivity .java

public class WelcomeActivity extends Activity implements AnimationListener {
private ImageView  imageView = null;
private Animation alphaAnimation = null;

@Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.welcome);
imageView = (ImageView)findViewById(R.id.welcome_image_view);
alphaAnimation = AnimationUtils.loadAnimation(this, R.anim.welcome_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
  }

@Override
public void onAnimationStart(Animation animation) {

}

@Override
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, MainActivity.class);
startActivity(intent);
this.finish();
}

@Override
public void onAnimationRepeat(Animation animation) {

}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
//在欢迎界面屏蔽BACK键
if(keyCode==KeyEvent.KEYCODE_BACK) {
return false;
}
return false;
}

}

登录后的主界面MainActivity .java

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}

布局文件

welcome_alpha.xml

<?xml version="1.0" encoding="utf-8"?>
<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="2000" 
/>
<alpha 
android:fromAlpha="1.0"
android:toAlpha="0.0"
android:startOffset="3000"
android:duration="3000" 
/>
</set>

welcome.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" 
    android:gravity="center_vertical|center_horizontal">
<ImageView
   android:id="@+id/welcome_image_view" 
   android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/welcome"
   />
</LinearLayout>

main.xml

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


    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="软件主界面" />


</LinearLayout>