Android 使用Gallery实现Tab

main.xml布局文件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<Gallery android:id="@+id/gallery" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:layout_marginTop="30dp"
		android:unselectedAlpha="1" android:spacing="1dip" />
</LinearLayout>

values/attrs.xml:

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

values/strings.xml:

<?xml version="1.0" encoding="utf-8"?>  
<resources>  
    <string name="hello">Hello World, Date!</string>  
    <string name="app_name">丸子-Widget</string>  
</resources>  

drawable/tab_button_select.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
	<gradient android:startColor="#FF1B1B1B" android:endColor="#FF969696"
		android:angle="90.0">
	</gradient>
</shape>

drawable/tab_button_unselect.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
	<gradient android:startColor="#FF000000" android:endColor="#FF474747"
		android:angle="90.0">
	</gradient>
</shape>

IaiaiActivity.java类:

package com.iaiai.activity;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.TextView;

/**
 * 
 * <p>
 * Title: IaiaiActivity.java
 * </p>
 * <p>
 * E-Mail: [e-mail]
 * </p>
 * <p>
 * QQ: 176291935
 * </p>
 * <p>
 * Http: iaiai.iteye.com
 * </p>
 * <p>
 * Create time: 2011-6-26
 * </p>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class IaiaiActivity extends Activity {

	private Gallery gallery;
	private TabAdapter textAdapter;

	private static final String[] PROGRAM_NAMES = { "中央一台", "中央二台", "中央三台",
			"中央四台", "中央五台", "中央六台", "中央七台", "中央八台", };

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		gallery = (Gallery) findViewById(R.id.gallery);
		textAdapter = new TabAdapter(this, Arrays.asList(PROGRAM_NAMES));
		gallery.setAdapter(textAdapter);
		gallery.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				TabAdapter adapter = (TabAdapter) parent.getAdapter();
				adapter.setSelectedPos(position);
			}

		});
	}

	public class TabAdapter extends BaseAdapter {
		private Context mContext;
		private List<String> mList;
		private int mSelectedPos;

		public TabAdapter(Context context, List<String> list) {
			mContext = context;
			TypedArray a = obtainStyledAttributes(R.styleable.Gallery);
			a.recycle();
			if (list == null)
				list = Collections.emptyList();
			mList = list;
		}

		public void setSelectedPos(int pos) {
			if (pos != mSelectedPos) {
				mSelectedPos = pos;
				notifyDataSetChanged();
			}
		}

		public int getSelectedPos() {
			return mSelectedPos;
		}

		public int getCount() {
			return mList.size();
		}

		public Object getItem(int position) {
			return mList.get(position);
		}

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

		public View getView(int position, View convertView, ViewGroup parent) {
			TextView text = null;
			if (convertView == null) {
				text = new TextView(mContext);
			} else {
				text = (TextView) convertView;
			}

			text.setTextColor(Color.WHITE);
			text.setText(mList.get(position));

			text.setLayoutParams(new Gallery.LayoutParams(102, 40));
			text.setGravity(Gravity.CENTER);

			if (position == mSelectedPos)
				text.setBackgroundResource(R.drawable.tab_button_select);
			else
				text.setBackgroundResource(R.drawable.tab_button_unselect);

			return text;
		}
	}

}

运行结果: