Android 使用Gallery实现Tab

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main.xml布局文件:

Java代码  
<?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:

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

values/strings.xml:

Java代码  
<?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:

Java代码  
<?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:

Java代码  
<?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:

Java代码  
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: 176291935@qq.com 
 * </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: