實現閃爍燈星星動畫

activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.xwy.xinxing.MainActivity"
    tools:ignore="MergeRootFrame"
    android:background="@drawable/back"
    android:orientation="vertical" >
    <ImageView 
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/star" />
    </FrameLayout>

flare.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
	<alpha android:fromAlpha="1"
	    android:toAlpha="0"
	    android:fillAfter="true"
	    android:repeatMode="reverse"
	    android:repeatCount="infinite"
	    android:duration="2000"/>
</set>

MainActivity.java

package com.xwy.xinxing;

import android.support.v4.app.Fragment;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;

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

		final Animation flare=AnimationUtils.loadAnimation(this, R.anim.flare);	//獲取“透明度變化”動畫資源
        final ImageView iv=(ImageView)findViewById(R.id.imageView1);		//獲取要應用動畫效果的ImageView
        iv.setX(100);	//設定星星的X座標的位置
        iv.setY(50);	//設定星星的Y座標的位置
        iv.startAnimation(flare);	//應用動畫效果
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	/**
	 * A placeholder fragment containing a simple view.
	 */
	public static class PlaceholderFragment extends Fragment {

		public PlaceholderFragment() {
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			View rootView = inflater.inflate(R.layout.fragment_main, container,
					false);
			return rootView;
		}
	}

}