Android(安卓)启动程序时动画效果（渐变）

转自http://blog.csdn.net/nmsoftklb/article/details/12943483

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

[html] view plaincopyprint?

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/welcome_img"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
RelativeLayout>

3、创建一个Activity,用来启动与实现渐变效果

[java] view plaincopyprint?

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();      }  }

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