Android TabSwitcher自定义控件

先来看下效果:


main.xml

<?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" android:background="#ffffff">
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
		android:id="@+id/tab" android:orientation="vertical"
		android:layout_width="fill_parent" android:layout_height="wrap_content"
		android:background="#ffffff">
	</LinearLayout>
</LinearLayout>

TabSwitcher.java

package com.iaiai.activity;

import android.content.Context;
import android.graphics.Color;
import android.view.Gravity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

/**
 * 
 * <p>
 * Title: TabSwitcher.java
 * </p>
 * <p>
 * E-Mail: 176291935@qq.com
 * </p>
 * <p>
 * QQ: 176291935
 * </p>
 * <p>
 * Http: iaiai.iteye.com
 * </p>
 * <p>
 * Create time: 2011-8-11
 * </p>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class TabSwitcher extends LinearLayout {

	private Context context;
	private String[] texts;
	private int selectedPosition = 0;
	private int oldPosition = selectedPosition;
	private int[] background = { R.drawable.tabswitcher_short,
			Color.TRANSPARENT };
	private TextView[] tvs;

	public TabSwitcher(Context context, String[] texts) {
		super(context);
		this.texts = texts;
		this.context = context;
		setOrientation(HORIZONTAL);
		LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
				LinearLayout.LayoutParams.FILL_PARENT,
				LinearLayout.LayoutParams.WRAP_CONTENT);
		setLayoutParams(params);
		setBackgroundResource(R.drawable.tabswitcher_long);
	}

	@Override
	protected void onFinishInflate() {
		// TODO Auto-generated method stub
		super.onFinishInflate();
		tvs = new TextView[texts.length];
		LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
				LinearLayout.LayoutParams.FILL_PARENT,
				LinearLayout.LayoutParams.WRAP_CONTENT);
		params.weight = 1;
		params.gravity = Gravity.CENTER_VERTICAL;
		for (int i = 0; i < texts.length; i++) {
			TextView child = new TextView(context);
			child.setTag(i);
			child.setTextSize(16);
			child.setTextColor(Color.BLACK);
			child.setGravity(Gravity.CENTER);

			tvs[i] = child;
			child.setOnClickListener(listener);
			this.addView(child, params);
		}
	}

	OnClickListener listener = new OnClickListener() {

		@Override
		public void onClick(View v) {
			selectedPosition = (Integer) v.getTag();
			if (selectedPosition != oldPosition) {
				tvs[oldPosition].setBackgroundColor(background[1]);
				oldPosition = selectedPosition;
				((TextView) v).setBackgroundResource(background[0]);
				if (onItemClickLisener != null) {
					onItemClickLisener.onItemClickLisener(v, selectedPosition);
				}
			}
		}

	};

	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		super.onSizeChanged(w, h, oldw, oldh);
		oldPosition = selectedPosition;
		for (int i = 0; i < texts.length; i++) {
			tvs[i].setText(texts[i]);
			if (selectedPosition == i) {
				tvs[i].setBackgroundResource(background[0]);
			} else {
				tvs[i].setBackgroundColor(background[1]);
			}
		}
	}

	private OnItemClickLisener onItemClickLisener;

	public void setOnItemClickLisener(OnItemClickLisener onItemClickLisener) {
		this.onItemClickLisener = onItemClickLisener;
	}

	public interface OnItemClickLisener {
		void onItemClickLisener(View view, int position);
	}

	public void setTexts(String[] texts) {
		this.texts = texts;
	}

	public void setSelectedPosition(int selectedPosition) {
		this.selectedPosition = selectedPosition;
	}

}

IaiaiActivity.java

package com.iaiai.activity;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;

import com.iaiai.activity.TabSwitcher.OnItemClickLisener;

/**
 * 
 * <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: 2011-8-11
 * </p>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class IaiaiActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		TabSwitcher tabSwitcher = new TabSwitcher(this, new String[] { "1",
				"2", "3", "4" });
		tabSwitcher.setSelectedPosition(1);
		tabSwitcher.setOnItemClickLisener(onItemClickLisener);
		tabSwitcher.onFinishInflate();
		
		LinearLayout linearLayout = (LinearLayout) findViewById(R.id.tab);
		linearLayout.addView(tabSwitcher, new LinearLayout.LayoutParams(
				LinearLayout.LayoutParams.FILL_PARENT,
				LinearLayout.LayoutParams.WRAP_CONTENT));
	}

	OnItemClickLisener onItemClickLisener = new OnItemClickLisener() {
		@Override
		public void onItemClickLisener(View view, int position) {
			// TODO Auto-generated method stub
			//
			switch (position) {
			case 0:
			case 1:
			case 2:
				Toast.makeText(IaiaiActivity.this,
						"position clicked:" + position, Toast.LENGTH_SHORT)
						.show();
				break;
			default:
				break;
			}
		}

	};
}

tabswitcher_long.9.png:

tabswitcher_short.9.png: