Android 启动程序时动画效果

1、当你打开一个应用程序时，总会看到前面有一个加载动画页面，下面我们就看看怎么来实现

2、新建一个.xml 文件，添加一个ImageView 组件，该组件用来加载图片

package com.example.activity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.Animation.AnimationListener;import android.widget.ImageView;public class MainActivity extends Activity {    private ImageView welcomeImg = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        welcomeImg = (ImageView) this.findViewById(R.id.welcome_img);        AlphaAnimation anima = new AlphaAnimation(0.3f, 1.0f);        anima.setDuration(3000);// 设置动画显示时间        welcomeImg.startAnimation(anima);        anima.setAnimationListener(new AnimationImpl());    }    private class AnimationImpl implements AnimationListener {        @Override        public void onAnimationStart(Animation animation) {            welcomeImg.setBackgroundResource(R.drawable.welcome);        }        @Override        public void onAnimationEnd(Animation animation) {            skip(); // 动画结束后跳转到别的页面        }        @Override        public void onAnimationRepeat(Animation animation) {        }    }    private void skip() {        startActivity(new Intent(this, OtherActivity.class));        finish();    }}