实现图像动画化，或者说都是幻灯片播放

package com.example.notificationdemo;

import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.animation.Animation;
import android.widget.ImageView;

public class AnimationActivity extends AppCompatActivity {
private ImageView iv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_animation);
        iv= (ImageView) findViewById(R.id.iv);
        iv.setBackgroundResource(R.drawable.logo);
        AnimationDrawable an = (AnimationDrawable) iv.getBackground();
        an.start();
    }
}