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   源码介绍

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package com.JavaTiger;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class Main extends Activity {
	@Override
	public void onCreate(Bundle savedInstanceState) {
		setTheme(R.style.CustomTheme);
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
		setContentView(R.layout.main);
		getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title);
		tvTitle = (TextView) findViewById(R.id.Titletext);
		tvTitle.setText("标题栏返回按钮测试界面1");

		btnBack = (Button) findViewById(R.id.TitleBackBtn);

		btnBack.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				KeyEvent newEvent = new KeyEvent(KeyEvent.ACTION_DOWN,
						KeyEvent.KEYCODE_BACK);
				onKeyDown(KeyEvent.KEYCODE_BACK, newEvent);
			}
		});

		btnNext = (Button) findViewById(R.id.Button);

		btnNext.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				Intent intent = new Intent();
				intent.setClass(Main.this, Next.class);
				startActivity(intent);
			}
		});
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
			// 按下的如果是BACK，同时没有重复
			askForOut();

			return true;
		}

		return super.onKeyDown(keyCode, event);
	}

	private void askForOut() {
		AlertDialog.Builder builder = new AlertDialog.Builder(this);

		builder.setTitle("确定退出").setMessage("确定退出？").setPositiveButton("确定",
				new DialogInterface.OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						finish();
					}
				}).setNegativeButton("取消",
				new DialogInterface.OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						dialog.cancel();
					}
				}).setCancelable(false).show();
	}

	public TextView tvTitle;
	public Button btnBack;
	public Button btnNext;
}