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 Android教程網 >> Android技術 >> 關於Android編程 >> android開發之Animation(五)

android開發之Animation(五)

編輯:關於Android編程

android開發之Animation的使用(五)

本博文主要講述的是Animation中的AnimationLisenter的使用方法,以及此類的一些生命周期函數的調用,代碼實例如下:

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);

}

//刪除imageView控件
class RemoveButtonListener implements OnClickListener{


@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//創建一個淡出效果的動畫對象
AlphaAnimation alphaAnimation = new AlphaAnimation(1.0f, 0.0f);
alphaAnimation.setDuration(2000);
//給Animation對象設置監聽器
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);

//在當前Activity中創建一個ImageView控件
ImageView addImageView = new ImageView(MainActivity.this);

//給ImageView設置ID
addImageView.setId(R.id.myImage);

//給ImageView控件設置圖片資源
addImageView.setImageResource(R.drawable.ic_launcher);

//viewGroup表示的是main.xml中的整個布局
//將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動畫效果的開始和結束等周期時,會調用其中的相關函數
class RemoveAnimationListener implements AnimationListener{


//當Animation效果結束後調用此方法
@Override
public void onAnimationEnd(Animation animation) {
// TODO Auto-generated method stub
System.out.println("Animation end");
//將ImageView在布局中刪除
viewGroup.removeView(imageView);
}


//當animation效果重復執行時調用此方法
@Override
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub
System.out.println("Animation repeat");
}

//當animation效果開始執行時調用此方法
@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: 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" >


android:id="@+id/myText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

android:id="@+id/myImage"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher"
android:layout_below="@id/myText"
/>

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