android开发中，对返回键事件的监听是要经常用到的，下面以一个例子来演示一下android对返回键的事件监听。

public class BackKeyTest extends Activity
{
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

	}
	
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event)
	{
		if (keyCode == KeyEvent.KEYCODE_BACK )
		{
			// 创建退出对话框
			AlertDialog isExit = new AlertDialog.Builder(this).create();
			// 设置对话框标题
			isExit.setTitle("系统提示");
			// 设置对话框消息
			isExit.setMessage("确定要退出吗");
			// 添加选择按钮并注册监听
			isExit.setButton("确定", listener);
			isExit.setButton2("取消", listener);
			// 显示对话框
			isExit.show();

		}
		
		return false;
		
	}
	/**监听对话框里面的button点击事件*/
	DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener()
	{
		public void onClick(DialogInterface dialog, int which)
		{
			switch (which)
			{
			case AlertDialog.BUTTON_POSITIVE:// "确认"按钮退出程序
				finish();
				break;
			case AlertDialog.BUTTON_NEGATIVE:// "取消"第二个按钮取消对话框
				break;
			default:
				break;
			}
		}
	};	
}

Android监听返回键