Android 基于ImageSwitcher实现的左右切换图片
左右切换图片控件大家都用ViewPager, ViewFipper比较多吧,我之前也用ViewPager实现了,使用ViewPager实现左右循环滑动图片,有兴趣的可以去看下,今天介绍的是基于ImageSwitcher实现的左右切换图片,先上截图吧
好了,接下来来看代码吧,第一张图是一个GridView,点击item跳转到第二个界面,第一个界面可以忽略,主要是讲解ImageSwitcher的左右却换图片,先看布局文件
- <?xml version="1.0" encoding="UTF-8"?>
 - <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 - android:layout_width="fill_parent"
 - android:layout_height="fill_parent" >
 - <ImageSwitcher
 - android:id="@+id/imageSwitcher1"
 - android:layout_width="fill_parent"
 - android:layout_height="fill_parent">
 - </ImageSwitcher>
 - <RelativeLayout
 - android:layout_width="fill_parent"
 - android:layout_height="wrap_content"
 - android:orientation="vertical" >
 - <LinearLayout
 - android:id="@+id/viewGroup"
 - android:layout_width="fill_parent"
 - android:layout_height="wrap_content"
 - android:layout_alignParentBottom="true"
 - android:layout_marginBottom="30dp"
 - android:gravity="center_horizontal"
 - android:orientation="horizontal" >
 - </LinearLayout>
 - </RelativeLayout>
 - </FrameLayout>
 
然后就是Activity代码啦,总体来说比较简单,代码我添加了注释
- package com.example.photoalbum;
 - import android.app.Activity;
 - import android.os.Bundle;
 - import android.view.MotionEvent;
 - import android.view.View;
 - import android.view.View.OnTouchListener;
 - import android.view.ViewGroup;
 - import android.view.animation.AnimationUtils;
 - import android.widget.ImageSwitcher;
 - import android.widget.ImageView;
 - import android.widget.LinearLayout;
 - import android.widget.RelativeLayout.LayoutParams;
 - import android.widget.Toast;
 - import android.widget.ViewSwitcher.ViewFactory;
 - public class ShowPhotoActivity extends Activity implements ViewFactory, OnTouchListener{
 - /**
 - * ImagaSwitcher 的引用
 - */
 - private ImageSwitcher mImageSwitcher;
 - /**
 - * 图片id数组
 - */
 - private int[] imgIds;
 - /**
 - * 当前选中的图片id序号
 - */
 - private int currentPosition;
 - /**
 - * 按下点的X坐标
 - */
 - private float downX;
 - /**
 - * 装载点点的容器
 - */
 - private LinearLayout linearLayout;
 - /**
 - * 点点数组
 - */
 - private ImageView[] tips;
 - @Override
 - protected void onCreate(Bundle savedInstanceState) {
 - super.onCreate(savedInstanceState);
 - setContentView(R.layout.show_photo);
 - imgIds = new int[]{R.drawable.item01,R.drawable.item02,R.drawable.item03,R.drawable.item04,
 - R.drawable.item05, R.drawable.item06, R.drawable.item07, R.drawable.item08,R.drawable.item09,
 - R.drawable.item10, R.drawable.item11, R.drawable.item12};
 - //实例化ImageSwitcher
 - mImageSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher1);
 - //设置Factory
 - mImageSwitcher.setFactory(this);
 - //设置OnTouchListener,我们通过Touch事件来切换图片
 - mImageSwitcher.setOnTouchListener(this);
 - linearLayout = (LinearLayout) findViewById(R.id.viewGroup);
 - tips = new ImageView[imgIds.length];
 - for(int i=0; i<imgIds.length; i++){
 - ImageView mImageView = new ImageView(this);
 - tips[i] = mImageView;
 - LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
 - LayoutParams.WRAP_CONTENT));
 - layoutParams.rightMargin = 3;
 - layoutParams.leftMargin = 3;
 - mImageView.setBackgroundResource(R.drawable.page_indicator_unfocused);
 - linearLayout.addView(mImageView, layoutParams);
 - }
 - //这个我是从上一个界面传过来的,上一个界面是一个GridView
 - currentPosition = getIntent().getIntExtra("position", 0);
 - mImageSwitcher.setImageResource(imgIds[currentPosition]);
 - setImageBackground(currentPosition);
 - }
 - /**
 - * 设置选中的tip的背景
 - * @param selectItems
 - */
 - private void setImageBackground(int selectItems){
 - for(int i=0; i<tips.length; i++){
 - if(i == selectItems){
 - tips[i].setBackgroundResource(R.drawable.page_indicator_focused);
 - }else{
 - tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused);
 - }
 - }
 - }
 - @Override
 - public View makeView() {
 - final ImageView i = new ImageView(this);
 - i.setBackgroundColor(0xff000000);
 - i.setScaleType(ImageView.ScaleType.CENTER_CROP);
 - i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
 - return i ;
 - }
 - @Override
 - public boolean onTouch(View v, MotionEvent event) {
 - switch (event.getAction()) {
 - case MotionEvent.ACTION_DOWN:{
 - //手指按下的X坐标
 - downX = event.getX();
 - break;
 - }
 - case MotionEvent.ACTION_UP:{
 - float lastX = event.getX();
 - //抬起的时候的X坐标大于按下的时候就显示上一张图片
 - if(lastX > downX){
 - if(currentPosition > 0){
 - //设置动画,这里的动画比较简单,不明白的去网上看看相关内容
 - mImageSwitcher.setInAnimation(AnimationUtils.loadAnimation(getApplication(), R.anim.left_in));
 - mImageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(getApplication(), R.anim.right_out));
 - currentPosition --;
 - mImageSwitcher.setImageResource(imgIds[currentPosition % imgIds.length]);
 - setImageBackground(currentPosition);
 - }else{
 - Toast.makeText(getApplication(), "已经是第一张", Toast.LENGTH_SHORT).show();
 - }
 - }
 - if(lastX < downX){
 - if(currentPosition < imgIds.length - 1){
 - mImageSwitcher.setInAnimation(AnimationUtils.loadAnimation(getApplication(), R.anim.right_in));
 - mImageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(getApplication(), R.anim.lift_out));
 - currentPosition ++ ;
 - mImageSwitcher.setImageResource(imgIds[currentPosition]);
 - setImageBackground(currentPosition);
 - }else{
 - Toast.makeText(getApplication(), "到了最后一张", Toast.LENGTH_SHORT).show();
 - }
 - }
 - }
 - break;
 - }
 - return true;
 - }
 - }
 
上面切换图片主要用到的就是动画了,用的是translate移动动画,不了解动画的同学到这里看看http://blog.csdn.net/xiaanming/article/details/8997260,我就不介绍了,接下来我吧动画代码贴出来,在res新建一个anim的目录,如下图
左边进入的动画,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"
 - android:duration="500"/>
 - </set>
 
左边出去的动画,left_out.xml
- <?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"/>
 - </set>
 
右边进入的动画,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"
 - android:duration="500"/>
 - </set>
 
右边出去的动画,right_out.xml
- <?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"/>
 - </set>
 
好了,介绍完了,代码写的不是很好,写的不好的地方希望您指出,谢谢
                    
                
                
            
        
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