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Android实现图片左右滑动效果

2019-12-12 05:02:15
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关于滑动效果,在Android中用得比较多,本示例实现的滑动效果是使用ViewFlipper来实现的,当然也可以使用其它的View来实现。接下来就让我们开始实现这种效果。

接下来我们看一下程序结构图:

MainActivity文件中代码:

package com.android.flip;import android.app.Activity;import android.os.Bundle;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.view.GestureDetector.OnGestureListener;import android.view.animation.AnimationUtils;import android.widget.ImageView;import android.widget.ViewFlipper;/** * Android实现左右滑动效果 * @Description: Android实现左右滑动效果 * @File: MainActivity.java * @Package com.android.flip * @Author Hanyonglu * @Date 2012-02-12 上午10:44:04 * @Version V1.0 */public class MainActivity extends Activity implements OnGestureListener {  private ViewFlipper flipper;  private GestureDetector detector;    /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);        detector = new GestureDetector(this);    flipper = (ViewFlipper) this.findViewById(R.id.ViewFlipper1);    flipper.addView(addImageView(R.drawable.one));    flipper.addView(addImageView(R.drawable.two));    flipper.addView(addImageView(R.drawable.three));    flipper.addView(addImageView(R.drawable.four));    flipper.addView(addImageView(R.drawable.five));  }    private View addImageView(int id) {    ImageView iv = new ImageView(this);    iv.setImageResource(id);    return iv;  }    @Override  public boolean onTouchEvent(MotionEvent event) {    // TODO Auto-generated method stub    return this.detector.onTouchEvent(event);  }    @Override  public boolean onDown(MotionEvent e) {    // TODO Auto-generated method stub    return false;  }    @Override  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,      float velocityY) {    if (e1.getX() - e2.getX() > 120) {      this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in));      this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));      this.flipper.showNext();      return true;    } else if (e1.getX() - e2.getX() < -120) {      this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_in));      this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_out));      this.flipper.showPrevious();      return true;    }        return false;  }    @Override  public void onLongPress(MotionEvent e) {    // TODO Auto-generated method stub      }    @Override  public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,      float distanceY) {    // TODO Auto-generated method stub    return false;  }    @Override  public void onShowPress(MotionEvent e) {    // TODO Auto-generated method stub      }    @Override  public boolean onSingleTapUp(MotionEvent e) {    // TODO Auto-generated method stub    return false;  }}

布局界面相对比较简单,我们只需要加入ViewFlipper就可以,代码如下:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  >  <ViewFlipper android:id="@+id/ViewFlipper1"    android:layout_width="fill_parent"     android:layout_height="fill_parent">  </ViewFlipper></LinearLayout>

为了使其滑动时有一定的特效,我们需要加入Animation效果,说到Animation,我们先看下如何在Android中实现自定义Animation。自定义的Animation是以XML格式定义的,定义好的XML文件存放在res/anim中。

一般的Animation有以下四种类型:

  1. Alpha:渐变透明度动画效果
  2. Scale:渐变尺寸伸缩动画效果
  3. Translate:画面转换位置移动动画效果
  4. Rotate:画面转换位置移动动画效果

push_left_in.xml文件中代码:

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android">  <translate android:fromXDelta="100%p" android:toXDelta="0"    android:duration="500" />  <alpha android:fromAlpha="0.1" android:toAlpha="1.0"    android:duration="500" /></set>  push_left_out.xml文件中代码: <?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android">  <translate android:fromXDelta="0" android:toXDelta="-100%p"    android:duration="500" />  <alpha android:fromAlpha="1.0" android:toAlpha="0.1"    android:duration="500" /></set>

push_right_in.xml文件中代码:

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android">  <translate android:fromXDelta="-100%p" android:toXDelta="0"    android:duration="500" />  <alpha android:fromAlpha="0.1" android:toAlpha="1.0"    android:duration="500" /></set>

push_right_out.xml文件中代码:

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android">  <translate android:fromXDelta="0" android:toXDelta="100%p"    android:duration="500" />  <alpha android:fromAlpha="1.0" android:toAlpha="0.1"    android:duration="500" /></set>

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