Gallery 模仿Flash广告栏

转自：http://androiddada.iteye.com/blog/1498261

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先上个效果图~

http://androiddada.iteye.com/

思路是这样的，功能方面：

首先这个是个左右循环的Gallery（其实是Integer.MAX_VALUE =?2147483647 这么多的个啦，接近无限了）。

这个网上有很多，不再赘述。代码里面也有，可以直接下载~

然后就是Gallery的样式，我这里 设置成无阴影的，间距 android:spacing="0dip"。

最后就是下面的指示条了，我使用FrameLayout布局，里面的指示点 radiobuttion.(因为只要一个是点亮的，用于指示当前位置，所以在一个group中)

下面是重要代码：

布局：

Xml代码??

1. <span?style="font-size:?small;"><?xml?version="1.0"?encoding="utf-8"?>??
2. <LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"??
3. ????android:layout_width="fill_parent"??
4. ????android:layout_height="fill_parent"??
5. ????android:orientation="vertical"?>??
6. ??<FrameLayout??
7. ????????????android:layout_width="fill_parent"??
8. ????????????android:layout_height="150dip"?>??
9. ??
10. ????????????<com.test.AdvGallery??
11. ?????????????????android:fadingEdge="none"???
12. ????????????????android:id="@+id/home_advs_gallery"???
13. ????????????????android:spacing="0dip"??
14. ????????????????android:layout_width="fill_parent"??
15. ????????????????android:layout_height="150dip"?/>??
16. ??
17. ????????????<LinearLayout??
18. ????????????????android:layout_width="fill_parent"??
19. ????????????????android:layout_height="20dip"??
20. ????????????????android:layout_gravity="bottom"??
21. ????????????????android:background="#55999999"??
22. ????????????????android:gravity="center"??
23. ????????????????android:orientation="horizontal"?>??
24. ??
25. ????????????????<RadioGroup??
26. ????????????????????android:gravity="center"??
27. ????????????????????android:id="@+id/home_advs_gallery_mark"??
28. ????????????????????android:orientation="horizontal"??
29. ????????????????????android:layout_width="fill_parent"??
30. ????????????????????android:layout_height="wrap_content"?>??
31. ???????????
32. ????????????????</RadioGroup>??
33. ????????????</LinearLayout>??
34. ????????</FrameLayout>??
35. ??
36. </LinearLayout></span>??

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自定义Gallery，为了解决Gallery拖拽滑动过快：

Java代码??

1. <span?style="font-size:?small;">public?class?AdvGallery?extends?Gallery?{??
2. ????public?AdvGallery(Context?context)?{??
3. ????????super(context);??
4. ????????//?TODO?Auto-generated?constructor?stub??
5. ????}??
6. ??????
7. ??
8. ????public?AdvGallery(Context?context,?AttributeSet?attrs)?{??
9. ????????super(context,?attrs);??
10. ????????//?TODO?Auto-generated?constructor?stub??
11. ????}??
12. ??
13. ????@Override??
14. ????public?boolean?onFling(MotionEvent?e1,?MotionEvent?e2,?float?velocityX,??
15. ????????????float?velocityY)?{??
16. ????????????//返回false?解决Gallery拖拽滑动过快??
17. ????????return?false;??
18. ????}??
19. ??
20. ????@Override??
21. ????public?void?setUnselectedAlpha(float?unselectedAlpha)?{??
22. ????????//?TODO?Auto-generated?method?stub??
23. ????????unselectedAlpha?=?1.0f;??
24. ????????super.setUnselectedAlpha(unselectedAlpha);??
25. ????}??
26. ??????
27. ????</span>??

adapter中的 getview方法：

Java代码??

1. <span?style="font-size:?small;">@Override??
2. ????public?View?getView(int?position,?View?convertView,?ViewGroup?parent)?{??
3. ????????//?TODO?Auto-generated?method?stub??
4. ????????????ImageView?imageView?=?new?ImageView(context);????
5. ????????????String?curr_URL?=?imgURL.get(position%imgURL.size());??
6. ????????????imageView.setTag(curr_URL);??
7. ?????????????Drawable?cachedImage?=?asyncImageLoader.loadDrawable(context,curr_URL,new?ImageCallback1()?{??
8. ????????????????????@Override??
9. ????????????????????public?void?imageLoaded(Drawable?imageDrawable,?String?imageUrl)?{??
10. ????????????????????????ImageView?imageViewByTag?=?(ImageView)?gallery.findViewWithTag(imageUrl);??
11. ????????????????????????if?(imageViewByTag?!=?null?&&?imageDrawable?!=?null?)?{???
12. ????????????????????????????imageViewByTag.setImageDrawable(imageDrawable);??
13. ????????????????????????????notifyDataSetChanged();??
14. ????????????????????????}??
15. ????????????????????}??
16. ????????????????});??
17. ?????????????if?(cachedImage?!=?null)?{??
18. ??????????????????imageView.setImageDrawable(cachedImage);??
19. ????????????}else{??
20. ????????????????imageView.setImageResource(R.drawable.ic_launcher);??
21. ????????????}??
22. ????????????//?设置边界对齐??
23. ?????????????imageView.setAdjustViewBounds(true);??
24. ?????????????imageView.setLayoutParams(new?Gallery.LayoutParams(??
25. ????????????????????LayoutParams.FILL_PARENT,?LayoutParams.FILL_PARENT));??
26. ????????????//设置比例类型????
27. //???????????imageView.setScaleType(ImageView.ScaleType.FIT_XY);??
28. ????????return?imageView;??
29. ????}</span>??

main中的oncreate：

Java代码??

1. <span?style="font-size:?small;">??@Override??
2. ????public?void?onCreate(Bundle?savedInstanceState)?{??
3. ????????super.onCreate(savedInstanceState);??
4. ????????setContentView(R.layout.main);??
5. ??????????
6. ????????_radioGroup?=?(RadioGroup)?findViewById(R.id.home_advs_gallery_mark);??
7. ????????_adv_Gallery?=?(Gallery)?findViewById(R.id.home_advs_gallery);??
8. ????????_advGalleryAdapter?=?new?AdvGalleryAdapter(ADV_GalleryActivity.this,_adv_imgURL,_adv_Gallery);??
9. ??????????
10. ????????_adv_Gallery.setAdapter(_advGalleryAdapter);??
11. ????????_adv_Gallery.setSelection(Integer.MAX_VALUE?>>?1);??
12. ????????_adv_Gallery.setOnItemSelectedListener(new?AdapterView.OnItemSelectedListener()?{??
13. ????????????@Override??
14. ????????????public?void?onItemSelected(AdapterView<?>?arg0,?View?arg1,??
15. ????????????????????int?arg2,?long?arg3)?{??
16. ????????????????//?TODO?Auto-generated?method?stub??
17. ????????????????_radioGroup.check(arg2%_adv_imgURL.size());?//Gallery焦点图片改变时?更改RadioGroup??
18. ????????????}??
19. ??
20. ????????????@Override??
21. ????????????public?void?onNothingSelected(AdapterView<?>?arg0)?{??
22. ????????????????//?TODO?Auto-generated?method?stub??
23. ????????????}??
24. ??
25. ????????});???
26. ????????//图片地址??
27. ????????_adv_imgURL.add("http://www.baidu.com/img/baidu_sylogo1.gif");??
28. ????????_adv_imgURL.add("http://www.iteye.com/images/logo.gif?1308833136");??
29. ????????_adv_imgURL.add("http://csdnimg.cn/www/images/csdnindex_logo.gif");??
30. ??????????
31. ????????for(int?i=0;i<_adv_imgURL.size();i++){??
32. ????????????RadioButton?rb?=?new?RadioButton(ADV_GalleryActivity.this);??
33. ????????????rb.setId(i);??
34. ????????????rb.setButtonDrawable(R.drawable.adv_gallery_mark_selector);??
35. ????????????rb.setClickable(false);??
36. ????????????_radioGroup.addView(rb);??
37. ????????}??
38. ??????????
39. ????}</span>??

http://androiddada.iteye.com/

由于代码比较多，放上源码，希望大家能用到~！

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