菜单按钮，回退键，退出对话框
public boolean onCreateOptionsMenu(Menu menu){ menu.add(0, 0, 0, "关于"); menu.add(0, 1, 1, "退出"); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { super.onOptionsItemSelected(item); switch (item.getItemId()) {case 0:openAboutDialog();break;case 1:openQiutDialog();break;default:break;} return true; } /** * 关于 */ private void openAboutDialog(){ new AlertDialog.Builder(this).setTitle("关于").setMessage("这是关于的练习") .setPositiveButton("确定", new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which) {}}).show(); } /** * 退出 */ private void openQiutDialog(){ new AlertDialog.Builder(this).setTitle("退出").setMessage("你真的要退出吗？") .setPositiveButton("退出", new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which) {finish();}}).setNegativeButton("取消", new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which) {}}).show(); } /** * 回退键提示 * */ @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode==KeyEvent.KEYCODE_BACK){ openQiutDialog(); } return false; }