android开发之Animation（五）

android开发之Animation的使用（五）

本博文主要讲述的是Animation中的AnimationLisenter的用法，以及此类的一些生命周期函数的调用，代码实比例如以下：

MainActivity.java：

package com.example.animationlistener;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

private ViewGroup viewGroup = null;
private Button addButton = null;
private Button removeButton = null;
private ImageView imageView = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

addButton = (Button)findViewById(R.id.addButton);
addButton.setOnClickListener(new AddButtonListener());

removeButton = (Button)findViewById(R.id.removeButton);
removeButton.setOnClickListener(new RemoveButtonListener());

viewGroup = (ViewGroup)findViewById(R.id.layout_id);

imageView = (ImageView)findViewById(R.id.myImage);

}

//删除imageView控件
class RemoveButtonListener implements OnClickListener{

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//创建一个淡出效果的动画对象
AlphaAnimation alphaAnimation = new AlphaAnimation(1.0f, 0.0f);
alphaAnimation.setDuration(2000);
//给Animation对象设置监听器
alphaAnimation.setAnimationListener(new RemoveAnimationListener());
imageView.startAnimation(alphaAnimation);

}

}

//加入ImageView控件
class AddButtonListener implements OnClickListener{

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
AlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 1.0f);

alphaAnimation.setDuration(2000);

//在当前Activity中创建一个ImageView控件
ImageView addImageView = new ImageView(MainActivity.this);

//给ImageView设置ID
addImageView.setId(R.id.myImage);

//给ImageView控件设置图片资源
addImageView.setImageResource(R.drawable.ic_launcher);

//viewGroup表示的是main.xml中的整个布局
//将imageView加入到布局中
viewGroup.addView(addImageView, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
//alphaAnimation.setAnimationListener(new addAnimationListener());

imageView = addImageView;

addImageView.startAnimation(alphaAnimation);

}

}

//AnimationLinstener主要是在Animation动画效果的開始和结束等周期时，会调用当中的相关函数
class RemoveAnimationListener  implements AnimationListener{

//当Animation效果结束后调用此方法
@Override
public void onAnimationEnd(Animation animation) {
// TODO Auto-generated method stub
System.out.println("Animation end");
//将ImageView在布局中删除
viewGroup.removeView(imageView);
}

//当animation效果反复运行时调用此方法
@Override
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub
System.out.println("Animation repeat");
}

//当animation效果開始运行时调用此方法
@Override
public void onAnimationStart(Animation animation) {
// TODO Auto-generated method stub
System.out.println("Animation start");
}

}

@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;
}

}

主布局文件main.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/layout_id"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/myText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    
   <ImageView 
            android:id="@+id/myImage"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_launcher"
            android:layout_below="@id/myText"
            />
    
    <Button 
        android:id="@+id/addButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/myImage"
        android:text="add image"
        
        />
    
     <Button 
        android:id="@+id/removeButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/addButton"
        android:text="remove image"
        />
    
</RelativeLayout>