android图片拖动Gallery

2.布局代码

<?xml version="1.0" encoding="utf-8"?>
<Gallery xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/Gallery"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</Gallery>

3.用一个类继承自BaseAdapter来充当容器
public class ImageAdapter extends BaseAdapter {

private Context mContext;

private Integer[] mImageIds = {
R.drawable.img1,
R.drawable.img2,
R.drawable.img3,
R.drawable.img4,
R.drawable.img5,
R.drawable.img6,
R.drawable.img7,
R.drawable.img8
};
public ImageAdapter(Context c){
this.mContext = c;
}
@Override
public int getCount() {
return mImageIds.length;//获取图片的个数

}

@Override
public Object getItem(int position) {
return position;//获取图片在库中的位置

}

@Override
public long getItemId(int position) {
return position;//获取图片在库中的位置

}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
Log.i("TAG", position+"");
ImageView imageView = new ImageView(mContext);
imageView.setImageResource(mImageIds[position]);
imageView.setLayoutParams(new Gallery.LayoutParams(100,100));//设置图片大小

imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);//设置显示比例类型

return imageView;
}

}


4.使用时的java代码：
public class Test_Gallery extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Gallery g = (Gallery) this.findViewById(R.id.Gallery);
g.setAdapter(new ImageAdapter(this));
g.setBackgroundResource(R.drawable.bg0);
g.setOnItemClickListener(new OnItemClickListener(){

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Toast.makeText(Test_Gallery.this, "选择了"+(arg2+1)+"号图片", Toast.LENGTH_SHORT).show();
}

});
}
}