Android入门笔记 - 界面开发 - 帧动画

今天来介绍一下Android中的帧动画，帧动画其实就是一张一张的图片，以一定的顺序播放，然后形成动画。

先来上一张效果图：

图中两个按钮，start开始播放动画， stop结束动画，来看看代码：

1. res/ drawable / frame_animation.xml :

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false" >
    <item android:drawable="@drawable/ma1" android:duration="100"></item>
    <item android:drawable="@drawable/ma2" android:duration="200"></item>
    <item android:drawable="@drawable/ma3" android:duration="100"></item>
    <item android:drawable="@drawable/ma4" android:duration="200"></item>
    <item android:drawable="@drawable/ma5" android:duration="100"></item>
    <item android:drawable="@drawable/ma6" android:duration="200"></item>
    <item android:drawable="@drawable/ma7" android:duration="100"></item>
    <item android:drawable="@drawable/ma8" android:duration="200"></item>
</animation-list>

2.  res/ layout/ activity_main.xml

<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity" >
	
    <Button 
        android:id="@+id/btn_start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="start"/>
    <Button 
        android:id="@+id/btn_stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="stop"/>
    
    <ImageView 
        android:id="@+id/ma_iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"/>
    

</LinearLayout>

package com.example.demo5_04_frameanimation;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.AnimationDrawable;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {
	private AnimationDrawable ad = null;
	ImageView iv;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		iv = (ImageView) findViewById(R.id.ma_iv);
		iv.setImageResource(R.drawable.frame_animation);
		ad = (AnimationDrawable)iv.getDrawable();
		
		Button btn_start = (Button) findViewById(R.id.btn_start);
		Button btn_stop = (Button) findViewById(R.id.btn_stop);
		btn_start.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				ad.start();
			}
		});
		btn_stop.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				ad.stop();
			}
		});
		
	}

	@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;
	}

}