gallery与ImageSwitcher

public class mainactivity extends Activity implements
OnItemSelectedListener, ViewFactory {
private ImageSwitcher is;
private Gallery gallery;

private Integer[] mThumbIds = { R.drawable.b, R.drawable.c,
R.drawable.d, R.drawable.f, R.drawable.g};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);

//绑定控件，并为ImageSwitcher设置工厂

is = (ImageSwitcher) findViewById(R.id.switcher);
is.setFactory(this);

//设置ImageSwitcher显示图像的动画效果
is.setInAnimation(AnimationUtils.loadAnimation(this,
android.R.anim.fade_in));
is.setOutAnimation(AnimationUtils.loadAnimation(this,
android.R.anim.fade_out));

//绑定控件，并设置设配器
gallery = (Gallery) findViewById(R.id.gallery);
gallery.setAdapter(new ImageAdapter(this));
gallery.setOnItemSelectedListener(this);
}

//为ImageSwitcher创建View对象以显示图片
@Override
public View makeView() {
ImageView i = new ImageView(this);
i.setBackgroundColor(0xFF000000);//ImageSwitcher背景
i.setScaleType(ImageView.ScaleType.FIT_CENTER);//图片显示位置

//ImageSwitcher的显示位置
i.setLayoutParams(new ImageSwitcher.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
return i;
}

public class ImageAdapter extends BaseAdapter {
public ImageAdapter(Context c) {
mContext = c;
}

public int getCount() {
return mThumbIds.length;
}

public Object getItem(int position) {
return position;
}

public long getItemId(int position) {
return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = new ImageView(mContext);

i.setImageResource(mThumbIds[position]);
i.setAdjustViewBounds(true);
i.setLayoutParams(new Gallery.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
i.setBackgroundResource(R.drawable.e);
return i;
}

private Context mContext;

}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
is.setImageResource(mImageIds[position]);

}

@Override
public void onNothingSelected(AdapterView<?> parent) {
}
}