Gallery的学习

代码如下:

Gallery g = (Gallery) findViewById(R.id.gallery);
		g.setAdapter(new ImageAdapter(this));

适配器代码:

package cn.com;

import android.content.Context;
import android.content.res.TypedArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {
	int mGalleryItemBackground;
	private Context mContext;

	private Integer[] mImageIds = { R.drawable.sample_1, R.drawable.sample_1,
			R.drawable.sample_1, R.drawable.sample_1, R.drawable.sample_1,
			R.drawable.sample_1, R.drawable.sample_1 };

	public ImageAdapter(Context c) {
		mContext = c;
		TypedArray a = c.obtainStyledAttributes(R.styleable.HelloGallery);
		mGalleryItemBackground = a.getResourceId(
				R.styleable.HelloGallery_android_galleryItemBackground, 0);
		a.recycle();
	}

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

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

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

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

		i.setImageResource(mImageIds[position]);
		i.setLayoutParams(new Gallery.LayoutParams(150, 100));
		i.setScaleType(ImageView.ScaleType.FIT_CENTER);
		i.setBackgroundResource(mGalleryItemBackground);

		return i;
	}

}

attrs.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
	<declare-styleable name="HelloGallery">
		<attr name="android:galleryItemBackground" />
	</declare-styleable>
</resources>

main.xml:

<?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" />