2010.06.05日志:Android Gallery左右循环旋转方法

如图：

先在attr.xml里写个Gallery的样式

1:  <?xml version="1.0" encoding="utf-8"?>

2:  <resources>

3:      <declare-styleable name="Gallery">

4:          <attr name="android:galleryItemBackground" />

5:      </declare-styleable>

6:      <!-- 定义Layout外部resources 的xml文件，用来改变Layout的背景图 -->

7:  </resources>

8:  

然后在mainActivity里的OnCreate里：

1:  setContentView(R.layout.main);

2:  

3:          imageAdapter = new myImageAdapter(this);

4:  

5:          gallery = (Gallery) findViewById(R.id.Gallery_preView);

6:          imageView = (ImageView) findViewById(R.id.ImageView_photo);

7:  

8:          gallery.setAdapter(imageAdapter);

9:          gallery.setSelection(200);//设置Gallery的起始位置

下面是imageAdapter的类，它继承BaseAdapter

图片资源：

1:  protected int[] myImageIds = { R.drawable.vista_1, R.drawable.vista_2,

2:              R.drawable.vista_3, R.drawable.vista_4, R.drawable.vista_5,

3:              R.drawable.vista_6, };

构造里：

 1:  public myImageAdapter(Context context) {

 2:          mContext = context;

 3:          /* 使用res/values/attr.xml中的<declare-styleable>定义的Gallery属性 */

 4:          TypedArray typed_array = context

 5:                  .obtainStyledAttributes(R.styleable.Gallery);

 6:          mGalleryItemBackground = typed_array.getResourceId(

 7:                  R.styleable.Gallery_android_galleryItemBackground, 0);

 8:          /* 让对象的styleable 属性能够反复使用 */

 9:          typed_array.recycle();

10:      }

11:  

getCount()方法：

1:  @Override

2:      public int getCount() {

3:          // TODO Auto-generated method stub

4:          // return myImageIds.length;

5:          return Integer.MAX_VALUE;

6:      }

getView()方法：

 1:  @Override

 2:      public View getView(int position, View convertView, ViewGroup parent) {

 3:          ImageView i = new ImageView(mContext);

 4:          

 5:          if (position < 0) {

 6:              position = position + myImageIds.length;

 7:          }

 8:          i.setImageResource(myImageIds[position % myImageIds.length]);

 9:          i.setScaleType(ImageView.ScaleType.FIT_XY);

10:          i.setLayoutParams(new Gallery.LayoutParams(128, 128));

11:          i.setBackgroundResource(mGalleryItemBackground);

12:          return i;

13:      }