android 左右滑动+索引图标实现方法与代码

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; 
} 
}