Android——Gallery 图片拖动效果

1、XML文件

<?xml version="1.0" encoding="utf-8"?>
<Gallery xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gallery01"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >

</Gallery>

2、ImageAdapter

public class ImageAdapter extends BaseAdapter {
// 定义context
private Context context;
// 定义整型数组，即图片源
private Integer[] imageIds = { R.drawable.button1, R.drawable.button2,
R.drawable.button3, R.drawable.button31 };

// 声明ImageAdapter
public ImageAdapter(Context c) {
context = c;
}

// 获取图片数量
@Override
public int getCount() {
return imageIds.length;
}

// 获取图片在库中的位置
@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;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView = new ImageView(context);
// 给ImageView设置资源
imageView.setImageResource(imageIds[position]);
// 设置布局图片以120*120显示
imageView.setLayoutParams(new Gallery.LayoutParams(120, 120));
// 设置显示比例类型
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
return imageView;
}

}

3、GalleryActivity

public class GalleryActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gallery);
// 获得Gallery对象
Gallery g = (Gallery) findViewById(R.id.gallery01);
g.setAdapter(new ImageAdapter(this));
// 设置gallery背景
// g.setBackgroundResource(R.drawable.button31);
// 设置gallery背景颜色
g.setBackgroundColor(Color.GRAY);
g.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
Toast.makeText(GalleryActivity.this,
"您选择了" + (position + 1) + "号图片", Toast.LENGTH_SHORT)
.show();
}
});
}

}

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