Android实战简易教程-第十二枪（ViewFlipper实现幻灯效果）

直接看代码

1.MainActivity.java:

package org.yayun.demo;

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.ViewFlipper;

public class MainActivity extends Activity implements
        android.view.GestureDetector.OnGestureListener {

    private int[] imgs = { R.drawable.img1, R.drawable.img2, R.drawable.img3 };
    private GestureDetector gestureDetector;
    private ViewFlipper viewFlipper;
    private Activity mActivity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mActivity = this;
        viewFlipper = (ViewFlipper) findViewById(R.id.viewflipper);

        gestureDetector = new GestureDetector(this);//手势监听

        for (int i = 0; i < imgs.length; i++) { // 添加图片源
            ImageView iv = new ImageView(this);
            iv.setImageResource(imgs[i]);
            iv.setScaleType(ImageView.ScaleType.FIT_XY);
            viewFlipper.addView(iv, new LayoutParams(LayoutParams.FILL_PARENT,
                    LayoutParams.FILL_PARENT));
        }

        viewFlipper.setAutoStart(true); // 设置自动播放功能（点击事件，前自动播放）
        viewFlipper.setFlipInterval(3000);//间隔3秒
        if (viewFlipper.isAutoStart() && !viewFlipper.isFlipping()) {
            viewFlipper.startFlipping();
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        viewFlipper.stopFlipping(); // 点击事件后，停止自动播放
        viewFlipper.setAutoStart(false);
        return gestureDetector.onTouchEvent(event); // 注册手势事件
    }

    public boolean onDown(MotionEvent arg0) {
        // TODO Auto-generated method stub
        return false;
    }

    public boolean onFling(MotionEvent e1, MotionEvent e2, float arg2,
            float arg3) {
        if (e2.getX() - e1.getX() > 120) { // 从左向右滑动（左进右出）
            Animation rInAnim = AnimationUtils.loadAnimation(mActivity,
                R.layout.push_right_in); // 向右滑动左侧进入的渐变效果（alpha 0.1 -> 1.0）
            Animation rOutAnim = AnimationUtils.loadAnimation(mActivity,
                    R.layout.push_right_out); // 向右滑动右侧滑出的渐变效果（alpha 1.0 -> 0.1）

            viewFlipper.setInAnimation(rInAnim);
            viewFlipper.setOutAnimation(rOutAnim);
            viewFlipper.showPrevious();
            return true;
        } else if (e2.getX() - e1.getX() < -120) { // 从右向左滑动（右进左出）
            Animation lInAnim = AnimationUtils.loadAnimation(mActivity,
                    R.layout.push_left_in); // 向左滑动左侧进入的渐变效果（alpha 0.1 -> 1.0）
            Animation lOutAnim = AnimationUtils.loadAnimation(mActivity,
                    R.layout.push_left_out); // 向左滑动右侧滑出的渐变效果（alpha 1.0 -> 0.1）

            viewFlipper.setInAnimation(lInAnim);
            viewFlipper.setOutAnimation(lOutAnim);
            viewFlipper.showNext();
            return true;
        }
        return true;
    }

    public void onLongPress(MotionEvent arg0) {
        // TODO Auto-generated method stub

    }

    public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2,
            float arg3) {
        // TODO Auto-generated method stub
        return false;
    }

    public void onShowPress(MotionEvent arg0) {
        // TODO Auto-generated method stub

    }

    public boolean onSingleTapUp(MotionEvent arg0) {
        // TODO Auto-generated method stub
        return false;
    }

}

2.active_main.xml:

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    android:orientation="vertical" >  

    <ViewFlipper  
        android:id="@+id/viewflipper"  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"/>  

</LinearLayout>  

下面看四个动画文件，很简单.

1.push_left_in.xml

<?xml version="1.0" encoding="utf-8"?>    
<set xmlns:android="http://schemas.android.com/apk/res/android" >    
    <translate    
        android:duration="1500"    
        android:fromXDelta="100%p"    
        android:toXDelta="0" />  <!-- 位移   -->

    <alpha    
        android:duration="1500"    
        android:fromAlpha="0.1"    
        android:toAlpha="1.0" /> <!-- 渐变    -->
</set> 

2.push_left_out.xml

<?xml version="1.0" encoding="utf-8"?>    
<set xmlns:android="http://schemas.android.com/apk/res/android" >    
    <translate    
        android:duration="1500"    
        android:fromXDelta="0"    
        android:toXDelta="-100%p" />    

    <alpha    
        android:duration="1500"    
        android:fromAlpha="1.0"    
        android:toAlpha="0.1" />    
</set>   

3.push_right_in.xml

<?xml version="1.0" encoding="utf-8"?>    
<set xmlns:android="http://schemas.android.com/apk/res/android" >    
    <translate    
        android:duration="1500"    
        android:fromXDelta="-100%p"    
        android:toXDelta="0" />    

    <alpha    
        android:duration="1500"    
        android:fromAlpha="0.1"    
        android:toAlpha="1.0" />    
</set>  

4.push_right_out.xml

<?xml version="1.0" encoding="utf-8"?>    
<set xmlns:android="http://schemas.android.com/apk/res/android" >    
    <translate    
        android:duration="1500"    
        android:fromXDelta="0"    
        android:toXDelta="100%p" />    

    <alpha    
        android:duration="1500"    
        android:fromAlpha="1.0"    
        android:toAlpha="0.1" />    
</set>

运行实例如下：

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