Android 欢迎页面

1、如图

2、分析
1)使用了透明动画AlphaAnimation
2)根据id找到布局文件view ，把动画设置到view
3)设置动画的监听事件，在onAnimationEnd事件后进行跳转到引导页面PagerActivity

3、源码

public class WelcomeActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_welcome);

        //1.拿到当前acitivity的layout的view
        //2.绑定透明度变化的动画
        //3.动画执行完毕后，进入主页面

        View view = findViewById(R.id.layout_welcome);

        AlphaAnimation anim = new AlphaAnimation(0.1f, 1.0f);
        anim.setDuration(3000);
        view.startAnimation(anim);

        anim.setAnimationListener(listener);
    }

    AnimationListener listener = new AnimationListener() {
        @Override
        public void onAnimationStart(Animation animation) {
        }
        @Override
        public void onAnimationRepeat(Animation animation) {
        }
        @Override
        public void onAnimationEnd(Animation animation) {
            startActivity(new Intent(WelcomeActivity.this, PagerActivity.class));
            finish();
        }
    };

    @Override
    public boolean onKeyDown(int keyCode, android.view.KeyEvent event) {
        return false;//表示按键不处理
    }


}

4、布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_welcome"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#f0f0f0" >

    <ImageView
        android:id="@+id/jing_girl_img"
        style="@style/ImageViewCenter"
        android:layout_marginTop="60dp"
        android:src="@drawable/jing_gril" />

    <ImageView
        android:id="@+id/know_img"
        style="@style/ImageViewCenter"
        android:layout_below="@id/jing_girl_img"
        android:layout_marginTop="30dp"
        android:src="@drawable/know_icon" />

    <ImageView
        android:id="@+id/copyright"
        style="@style/ImageViewCenter"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="20dp"
        android:src="@drawable/copyright" />

</RelativeLayout>