android开发之Animation的使用（五）
本博文主要讲述的是Animation中的AnimationLisenter的使用方法，以及此类的一些生命周期函数的调用，代码实例如下：
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);
}
}
//添加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添加到布局中
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动画效果的开始和结束等周期时，会调用其中的相关函数
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效果重复执行时调用此方法
@Override
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub
System.out.println("Animation repeat");
}
//当animation效果开始执行时调用此方法
@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>