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();
           }
       });
   }

}

来源：https://www.cnblogs.com/Defry/p/4401417.html

标签

position

gallery