android中无限循环滑动的gallery实例

android中无限循环滑动的gallery实例

1.点击图片有变暗的效果，使用imageview.setAlpha(),并且添加ontouchListener

 public void init() {
         dots = new ImageView[len];
         for (int j = 0; j < len; j++) {
             // 添加图片
             final ImageView iv = new ImageView(this);
             iv.setImageResource(res[j]);
             views.add(iv);
             iv.setOnTouchListener(new OnTouchListener() {

                 @Override
                 public boolean onTouch(View v, MotionEvent event) {
                     if (event.getAction() == MotionEvent.ACTION_DOWN) {
                         iv.setAlpha(70);
                         slideHandler.removeCallbacks(slideRun);
                     }
                     return false;
                 }
             });
             // 添加索引
             ImageView imageView = new ImageView(this);
             imageView.setLayoutParams(new LayoutParams(15, 15));
             dots[j] = imageView;
             TextView tv = new TextView(this);
             tv.setText("  ");
             if (j == 0) {
                 // 默认进入程序后第一张图片被选中;
                 dots[j].setBackgroundResource(R.drawable.yst_i_pageon);
             } else {
                 dots[j].setBackgroundResource(R.drawable.yst_i_pageoff);
             }

             layout_point.addView(tv);
             layout_point.addView(imageView);
         }
         gallery.setAdapter(new ImageAdapter());
         gallery.setSelection((Integer.MAX_VALUE / 2) - (Integer.MAX_VALUE / 2)
                 % len);
         gallery.setOnItemSelectedListener(selectListener);
         ((MyGallery) gallery).setViews(views);
         // TODO 定时滑动
         startSlide();
     }

2.无限滑动，自定义adapter,设置count为最大值，图片总数循环从0到图片的总长度

 public class ImageAdapter extends BaseAdapter {

         public int getCount() {
             if (views != null) {
                 return Integer.MAX_VALUE;
             } else {
                 return 0;
             }
         }

         public Object getItem(int position) {
             if (position >= len) {
                 position = position % len;
             }

             return position;
         }

         public long getItemId(int position) {
             if (position >= len) {
                 position = position % len;
             }
             return position;
         }

         public View getView(int position, View convertView, ViewGroup parent) {
             View view = convertView;
             if (position >= len) {
                 position = position % len;
             }
             if (view == null) {
                 view = views.get(position);
             }

             return view;
         }
     }

3.自动滑动，自定义gallery,重写onFling方法，触摸时，停止滑动，弹起时继续滑动

 public class MyGallery extends Gallery {

     private List<ImageView> views;
     /** 左边 */
     public static final int LEFT = 0;
     /** 右边 */
     public static final int RIGHT = 1;

     public MyGallery(Context context) {
         super(context);
         // TODO Auto-generated constructor stub
     }

     public MyGallery(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
         // TODO Auto-generated constructor stub
     }

     public MyGallery(Context context, AttributeSet attrs) {
         super(context, attrs);
         // TODO Auto-generated constructor stub
     }

     /** 设置视图 */
     public void setViews(List<ImageView> views) {
         this.views = views;
     }

     @Override
     public boolean onTouchEvent(MotionEvent event) {
         // TODO Auto-generated method stub
         if (event.getAction() == MotionEvent.ACTION_UP) {
             // 遍历views 设置alpha
             if (views != null && !views.isEmpty()) {
                 for (ImageView iv : views) {
                     iv.setAlpha(255);
                 }
             }
             Context context = this.getContext();
             if (context != null && context instanceof MainActivity) {
                    MainActivity main=(MainActivity) context;
                    main.startSlide();
             }
         }
         return super.onTouchEvent(event);
     }

     /** 滑动 direction=1向右，-1向左 */
     public void slide(int direction) {
         // MotionEvent e1 = MotionEvent.obtain(SystemClock.uptimeMillis(),
         // SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN,
         // 89.333336f, 265.33334f, 0);
         // MotionEvent e2 = MotionEvent.obtain(SystemClock.uptimeMillis(),
         // SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, 300.0f,
         // 238.00003f, 0);
         if (direction == this.RIGHT)
             this.onFling(null, null, -1200, 0);
         else {
             this.onFling(null, null, 1200, 0);
         }
     }
 }

下面贴出完整代码：
布局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:background="@android:color/background_light"
    tools:context=".MainActivity" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:gravity="center"
        android:orientation="vertical" >

        <com.allen.gallery.MyGallery
            android:id="@+id/mygallery"
            android:layout_width="fill_parent"
            android:layout_height="160dp"
            android:fadingEdge="horizontal|vertical"
            android:fadingEdgeLength="20dp" />

        <LinearLayout
            android:id="@+id/layout_dots"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:orientation="horizontal" >
        </LinearLayout>
    </LinearLayout>

</RelativeLayout>

2.完整的实现代码：

 package com.allen.gallery;

 import java.util.ArrayList;
 import java.util.List;

 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.OnTouchListener;
 import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 import android.widget.AdapterView;
 import android.widget.BaseAdapter;
 import android.widget.Gallery;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;

 public class MainActivity extends Activity {
     private List<ImageView> views = new ArrayList<ImageView>();
     /** 图片资源 */
     private int[] res = new int[] { R.drawable.image1, R.drawable.image2,
             R.drawable.image3, R.drawable.image4 };
     private ImageView[] dots;
     int len = 4;
     int currentItem = 0;// 当前选中的viewPager的item
     private Gallery gallery;
     private LinearLayout layout_point;
     /** 定时滑动 */
     private final Handler slideHandler = new Handler();
     /** 滑动 */
     private final Runnable slideRun = new Runnable() {

         @Override
         public void run() {
             // TODO Auto-generated method stub
             currentItem++;
             currentItem = checkPosition(currentItem);
             ((MyGallery) gallery).slide(MyGallery.RIGHT);
             slideHandler.postDelayed(this, 2000);
         }
     };

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         // 初始化中间
         layout_point = (LinearLayout) this.findViewById(R.id.layout_dots);
         gallery = (Gallery) findViewById(R.id.mygallery);
         gallery.setSpacing(20);
         init();
     }

     public void init() {
         dots = new ImageView[len];
         for (int j = 0; j < len; j++) {
             // 添加图片
             final ImageView iv = new ImageView(this);
             iv.setImageResource(res[j]);
             views.add(iv);
             iv.setOnTouchListener(new OnTouchListener() {

                 @Override
                 public boolean onTouch(View v, MotionEvent event) {
                     if (event.getAction() == MotionEvent.ACTION_DOWN) {
                         iv.setAlpha(70);
                         slideHandler.removeCallbacks(slideRun);
                     }
                     return false;
                 }
             });
             // 添加索引
             ImageView imageView = new ImageView(this);
             imageView.setLayoutParams(new LayoutParams(15, 15));
             dots[j] = imageView;
             TextView tv = new TextView(this);
             tv.setText("  ");
             if (j == 0) {
                 // 默认进入程序后第一张图片被选中;
                 dots[j].setBackgroundResource(R.drawable.yst_i_pageon);
             } else {
                 dots[j].setBackgroundResource(R.drawable.yst_i_pageoff);
             }

             layout_point.addView(tv);
             layout_point.addView(imageView);
         }
         gallery.setAdapter(new ImageAdapter());
         gallery.setSelection((Integer.MAX_VALUE / 2) - (Integer.MAX_VALUE / 2)
                 % len);
         gallery.setOnItemSelectedListener(selectListener);
         ((MyGallery) gallery).setViews(views);
         // TODO 定时滑动
         startSlide();
     }

     private AdapterView.OnItemSelectedListener selectListener = new AdapterView.OnItemSelectedListener() {

         @Override
         public void onItemSelected(AdapterView<?> parent, View view,
                 int position, long id) {
             // TODO Auto-generated method stub
             if (position >= len) {
                 position = position % len;
                 currentItem = position;
             }
             selectPage();
         }

         @Override
         public void onNothingSelected(AdapterView<?> parent) {
             // TODO Auto-generated method stub
         }
     };

     public class ImageAdapter extends BaseAdapter {

         public int getCount() {
             if (views != null) {
                 return Integer.MAX_VALUE;
             } else {
                 return 0;
             }
         }

         public Object getItem(int position) {
             if (position >= len) {
                 position = position % len;
             }

             return position;
         }

         public long getItemId(int position) {
             if (position >= len) {
                 position = position % len;
             }
             return position;
         }

         public View getView(int position, View convertView, ViewGroup parent) {
             View view = convertView;
             if (position >= len) {
                 position = position % len;
             }
             if (view == null) {
                 view = views.get(position);
             }

             return view;
         }
     }

     /** 开始滑动 */
     public void startSlide() {
         slideHandler.postDelayed(slideRun, 2000);
     }

     public int checkPosition(int position) {
         if (position >= len) {
             position = position % len;
         }

         return position;
     }

     /** 设置当前选中页 */
     private void selectPage() {
         /** 设置当前显示的页码 */
         for (int i = 0; i < len; i++) {
             dots[currentItem].setBackgroundResource(R.drawable.yst_i_pageon);
             if (currentItem != i) {
                 dots[i].setBackgroundResource(R.drawable.yst_i_pageoff);
             }
         }
     }
 }

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