以下会会用到的技术有:
1、ViewFlipper
2、GestureDetector
3、Animation
第一次在iteye写博文,本人又是菜鸟,不喜勿喷,虚心听取建议。
原理:向左向右滑动主要是依赖手势来控制,手势向右滑动就调用 viewFlipper.showNext();方法,同理,向左滑动就会去调用viewFlipper.showPrevious();方法。
话不多少,直接上代码。
main_activity.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" 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" > <ViewFlipper android:id="@+id/viewFlipper" android:layout_width="fill_parent" android:layout_height="fill_parent"></ViewFlipper> </RelativeLayout>
下面是MainActivity内容:
package com.zls.viewflipper; import android.os.Bundle; import android.app.Activity; import android.view.GestureDetector; import android.view.GestureDetector.OnGestureListener; import android.view.Menu; import android.view.MotionEvent; import android.view.Window; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.ImageView; import android.widget.ViewFlipper; /** * 这个程序的功能:手势滑动 * @author zls * */ public class MainActivity extends Activity implements OnGestureListener{ private Animation left_in,left_out,right_in,right_out; private ViewFlipper viewFilpper; private GestureDetector detector; //手势监听 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); //动画效果 left_in = AnimationUtils.loadAnimation(this, R.anim.left_in); left_out = AnimationUtils.loadAnimation(this, R.anim.left_out); right_in = AnimationUtils.loadAnimation(this, R.anim.right_in); right_out = AnimationUtils.loadAnimation(this, R.anim.right_out); //获得viewFlipper viewFilpper = (ViewFlipper) findViewById(R.id.viewFlipper); detector = new GestureDetector(this); //给viewFlipper添加ImageView viewFilpper.addView(getImageView(R.drawable.lufei)); viewFilpper.addView(getImageView(R.drawable.namei)); viewFilpper.addView(getImageView(R.drawable.solong)); } //touch事件交给手势处理 @Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub return this.detector.onTouchEvent(event); } public ImageView getImageView(int id) { ImageView imageView = new ImageView(this); imageView.setImageResource(id); return imageView; } @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; } @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(e2.getX()-e1.getX()<-120) { viewFilpper.setInAnimation(left_in); viewFilpper.setOutAnimation(left_out); viewFilpper.showNext(); return true; } else if(e2.getX()-e1.getX()>120){ viewFilpper.setInAnimation(right_in); viewFilpper.setOutAnimation(right_out); viewFilpper.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; } }
在res文件夹下新建anim文件夹,在里面建4个animation动画的xml文件,具体代码如下:
Left_in.xml:
<?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%p" android:duration="500"/> <alpha android:fromAlpha="0.1" android:toAlpha="1.0" android:duration="500"/> </set> Left_out.xnl: <?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:fromXDelta="0%p" android:toXDelta="-100%p" android:duration="500"/> <alpha android:fromAlpha="1.0" android:toAlpha="0.1" android:duration="500"/> </set>
right_in.xml:
<?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%p" android:duration="500"/> <alpha android:fromAlpha="0.1" android:toAlpha="1.0" android:duration="500"/> </set>
right_out.xml:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:fromXDelta="0%p" android:toXDelta="100%p" android:duration="500"/> <alpha android:fromAlpha="1.0" android:toAlpha="0.1" android:duration="500"/> </set>