android中怎么退出应用程序
<span style="font-size:18px;">public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
// 确认对话框
final AlertDialog isExit = new AlertDialog.Builder(this).create();
// 对话框标题
isExit.setTitle("系统提示");
// 对话框消息
isExit.setMessage("确定要退出吗?");
// 实例化对话框上的按钮点击事件监听
DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case AlertDialog.BUTTON1:// "确认"按钮退出程序
NotificationManager notificationManager = (NotificationManager) MainActivity.this
.getSystemService(NOTIFICATION_SERVICE);
notificationManager.cancel(0);
String packagename = getPackageName();
ActivityManager manager = (ActivityManager)getSystemService(ACTIVITY_SERVICE);
finish();
if(getSystemVersion()<8){
manager.restartPackage(getPackageName());
}else{
manager.killBackgroundProcesses(packagename);
}
break;
case AlertDialog.BUTTON2:// "取消"第二个按钮取消对话框
isExit.cancel();
break;
default:
break;
}
}
};
// 注册监听
isExit.setButton("确定", listener);
isExit.setButton2("取消", listener);
// 显示对话框
isExit.show();
return false;
}
return false;
}</span>