Android开发_Animation

新建项目：

http://www.cnblogs.com/hongten/gallery/image/112163.html

项目结构：

http://www.cnblogs.com/hongten/gallery/image/112162.html

p1.png是自己添加进去的，当然也可以使用其他图片

main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layoutId"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        >
            <!-- 添加图片 -->
            <Button
                android:id="@+id/btn_add"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="添加图片"    
            />
            <!-- 删除图片 -->
            <Button
                android:id="@+id/btn_delete"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="删除图片"
            />
        </LinearLayout>
        <!-- 显示图片  -->    
        <ImageView
            android:id="@+id/iv_image"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:layout_marginTop="120dip"
            android:layout_marginLeft="50dip"
            android:src="@drawable/p1"
        />
</RelativeLayout>

Main.java

package com.b510;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
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 Main extends Activity {
    private static final String TAG="Main";
    /** 添加图片 */
    private Button addButton;
    /** 删除图片 */
    private Button deleteButton;
    /** 显示图片 */
    private ImageView imageView;
    /** RaletvieLayout布局，他是包含了</br>Button，ImageView控件,定义在main.xml文件中 */
    private ViewGroup viewGroup;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        // 从main.xml文件中找到对应的控件
        addButton = (Button) findViewById(R.id.btn_add);
        deleteButton = (Button) findViewById(R.id.btn_delete);
        imageView = (ImageView) findViewById(R.id.iv_image);
        viewGroup = (ViewGroup) findViewById(R.id.layoutId);

        deleteButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // 申明一个AlphaAnimation对象，从完全不透明到完全透明
                AlphaAnimation alphaAnimation = new AlphaAnimation(1.0f, 0.0f);
                // 设置动画持续时间为2秒钟
                alphaAnimation.setDuration(2000);
                // 执行动画前，延迟0.5秒钟
                alphaAnimation.setStartOffset(500);
                //为Animation对象设置监听器
                alphaAnimation.setAnimationListener(new AnimationListener() {
                    @Override
                    public void onAnimationStart(Animation animation) {
                        Log.i(TAG, "start");
                    }
                    
                    @Override
                    public void onAnimationRepeat(Animation animation) {
                        Log.i(TAG, "repeat");
                    }
                    
                    @Override
                    public void onAnimationEnd(Animation animation) {
                        Log.i(TAG, "end");
                        //从viewGroup中移除imageView
                        viewGroup.removeView(imageView);
                    }
                });
                imageView.startAnimation(alphaAnimation);
            }
        });

        addButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // 申明一个AlphaAnimation对象，从完全透明到完全不透明
                AlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 1.0f);
                // 设置动画持续时间为2秒钟
                alphaAnimation.setDuration(2000);
                // 执行动画前，延迟0.5秒钟
                alphaAnimation.setStartOffset(500);
                viewGroup.addView(imageView);
                // 启动动画
                imageView.startAnimation(alphaAnimation);
            }
        });
    }
}

运行效果

1.初始化

http://www.cnblogs.com/hongten/gallery/image/112164.html

2.点击删除图片按钮

http://www.cnblogs.com/hongten/gallery/image/112165.html

3.点击添加图片按钮

http://www.cnblogs.com/hongten/gallery/image/112166.html

4.后台运行情况

http://www.cnblogs.com/hongten/gallery/image/112167.html

当我们点击删除按钮的时候，android系统会自动调用onAnimationStart()方法，再调用onAnimationEnd()方法。