package com.example1.backtest;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.view.KeyEvent;
import android.view.Menu;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
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(-1,"确定", listener);
isExit.setButton(-2,"取消", listener);
// 显示对话框
isExit.show();
}
return false;
}
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;
}
}
};
}