android 左右滑动 +索引图标

public class MGalleryView extends Gallery{

    public MGalleryView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    //一次只能滑动一张图片注：一张图充满全屏
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        int kEvent;
        if (isScrollingLeft(e1, e2)) {
            // Check if scrolling left
            kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
        } else {
            // Otherwise scrolling right
            kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
        }
        onKeyDown(kEvent, null);
        return true;
    }

    private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2) {
        return e2.getX() > e1.getX();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" 
   >
   <!--自定义的Gallery  -->
   <com.example.demo.MGalleryView 
       android:id="@+id/gallery_id"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:spacing="50dp"
       android:layout_marginTop="20dp"/>
   <!--Gallery的索引图片容器  -->
    <LinearLayout 
        android:id="@+id/linearlayout_id"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="-20dp"
        android:orientation="horizontal"
        android:gravity="center_horizontal"></LinearLayout>

</LinearLayout>

public class MGalleryActivity extends Activity {
    int[] data = new int[] { R.drawable.image1, R.drawable.image2,
            R.drawable.image3, R.drawable.image4, R.drawable.image5,
            R.drawable.image6 };
    private ImageView[] imageviews;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.galleryactvity);
        setView();
    }

    private void setView() {
        MGalleryView gallery = (MGalleryView) findViewById(R.id.gallery_id);
        LinearLayout viewgroup = (LinearLayout) findViewById(R.id.linearlayout_id);
        imageviews = setGalleryIndex(viewgroup);
        gallery.setAdapter(new MGalleryAdapter(this, data));
        //Gallery每次滑动都调用这个方法
        gallery.setOnItemSelectedListener(new OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {
                //使用for循环，给所有的gallery索引添加图片
                for (int i = 0; i < imageviews.length; i++) {
                        imageviews[i]
                                .setImageResource(R.drawable.alipay_n);
                }
                //为被选中的gallery的索引添加图片
                imageviews[arg2].setImageResource(R.drawable.alipay_s);
            }
            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
            }
        });
    }
    //设置左右滑动索引
    private ImageView[] setGalleryIndex(LinearLayout viewgroup) {
        ImageView[] images = new ImageView[data.length];
        for (int i = 0; i < images.length; i++) {
            ImageView newimage = new ImageView(this);
            newimage.setLayoutParams(new LayoutParams(20, 10));
            newimage.setPadding(5, 0, 5, 0);
            images[i] = newimage;
            if (i == 0) {
                //默认选择第一张
                images[i].setImageResource(R.drawable.alipay_n);
            } else {
                images[i].setImageResource(R.drawable.alipay_s);
            }
            viewgroup.addView(images[i]);
        }
        return images;
    }
}

public class MGalleryAdapter extends BaseAdapter{
    private int[] data;
    private Context mContext;
    public MGalleryAdapter(Context context,int[] data) {
        this.data=data;
        this.mContext=context;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return data.length;
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView image = new ImageView(mContext);
        image.setImageResource(data[position]);
        return image;
    }

}