Android真正简单的教程-第十二枪（ViewFlipper实现滑动效果）

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++) { // 加入图片源
			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); // 设置自己主动播放功能（点击事件，前自己主动播放）
		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。停止自己主动播放
		viewFlipper.setAutoStart(false);
		return gestureDetector.onTouchEvent(event); // 注冊手势事件
	}

	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); // 向右滑动左側进入的渐变效果（alpha 0.1 -> 1.0）
			Animation rOutAnim = AnimationUtils.loadAnimation(mActivity,
					R.layout.push_right_out); // 向右滑动右側滑出的渐变效果（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); // 向左滑动左側进入的渐变效果（alpha 0.1 -> 1.0）
			Animation lOutAnim = AnimationUtils.loadAnimation(mActivity,
					R.layout.push_left_out); // 向左滑动右側滑出的渐变效果（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>  

以下看四个动画文件，非常easy.

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>

执行实比例如以下：

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