• 关于 activity home 的搜索结果

回答

过一段时间之后回到应用,程序不会从activity的oncreate去执行,因此的的网络请求不会去执行。你应该去学习android中activity的生命周期。 当点击home键退出当前界面的时候,这时候activity就处于“后台”状态了。 情况一:如果系统资源紧张的话,那么有可能你的activity会被回收了,当用户切换到应用界面的时候,该activity重新构建,如果你之前没保存好状态信息的话,那么所有数据就不见了。 情况二:系统资源充足,activity没有被回收,那么activity会从onResume()方法开始重新执行

爱吃鱼的程序员 2020-06-20 17:34:42 0 浏览量 回答数 0

问题

android startActivity 过慢

爵霸 2019-12-01 19:42:20 1622 浏览量 回答数 1

问题

android startActivity 过慢

爵霸 2019-12-01 19:47:12 1240 浏览量 回答数 2

新手开公司,教你化繁为简

开公司到底有没有那么难,传统的手续繁琐,线下跑断腿,场地搞不定等问题,通过阿里云”云上公司注册“解决你的烦恼。

问题

Activity在后台驻留时当时间过长或是内存不足系统有没有可能销毁或析构该页面

蛮大人123 2019-12-01 20:14:55 983 浏览量 回答数 1

问题

Android——Activity和Fragment 的相关问题

爵霸 2019-12-01 19:51:53 1041 浏览量 回答数 0

回答

你可以查看一下Activity的生命周期,当你按home键时,该Activity并没有被销毁,当再次打开时会依次调用onRestart,onStart,onResume再次进入运行状态,你可以在onPause或onStop方法里保存你想要的状态(根据你自己的需求),然后在onRestart方法里去重新加载。总之根据你自己的需求调整

爵霸 2019-12-02 02:50:07 0 浏览量 回答数 0

回答

你可以查看一下Activity的生命周期,当你按home键时,该Activity并没有被销毁,当再次打开时会依次调用onRestart,onStart,onResume再次进入运行状态,你可以在onPause或onStop方法里保存你想要的状态(根据你自己的需求),然后在onRestart方法里去重新加载。总之根据你自己的需求调整

爵霸 2019-12-02 03:15:56 0 浏览量 回答数 0

问题

android 无法直接退出程序

爵霸 2019-12-01 20:01:31 881 浏览量 回答数 1

回答

android.os.Process.killProcess(android.os.Process.myPid()); 当前的activityA是被干掉了,但是还是会被ActivityManager接管返回到前一个activity改成下面 Intent intent=new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_HOME); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); System.exit(0);

爵霸 2019-12-02 02:50:02 0 浏览量 回答数 0

问题

请问Android 5.0 怎么屏蔽HOME键 ?

爵霸 2019-12-01 20:25:02 1686 浏览量 回答数 1

回答

在 Home.java 中调用 main activitybtnBack.setOnClickListener(new OnClickListener(){ private void onClick(){ Intent intent = new Intent(currentActivity.this, Home.class); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP) startActivity(intent); } });

蛮大人123 2019-12-02 02:50:43 0 浏览量 回答数 0

回答

在Activity中重写方法实现: @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_BACK) //放回设置 { // finish(); return false; } else if(keyCode == KeyEvent.KEYCODE_HOME) //home 处理 { //由于Home键为系统键,所以要加权限。并拦截事件,这里就不写了。网上搜“android重写home键”,随随便便就有一堆文章 finish(); return false; } return super.onKeyDown(keyCode, event); }

DM。 2020-05-29 18:58:00 0 浏览量 回答数 0

回答

一般我们会搭配两个方法来使用:public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState)public void onRestoreInstanceState(Bundle savedInstanceState, PersistableBundle persistentState)前一个方法会在下述情形中被调用:点击home键回到主页或长按后选择运行其他程序按下电源键关闭屏幕启动新的Activity横竖屏切换时,肯定会执行,因为横竖屏切换的时候会先销毁Act,然后再重新创建 重要原则:当系统"未经你许可"时销毁了你的activity,则onSaveInstanceState会被系统调用, 这是系统的责任,因为它必须要提供一个机会让你保存你的数据(你可以保存也可以不保存)。而后一个方法,和onCreate同样可以从取出前者保存的数据: 一般是在onStart()和onResume()之间执行! 之所以有两个可以获取到保存数据的方法,是为了避免Act跳转而没有关闭, 然后不走onCreate()方法,而你又想取出保存数据~说回这个Activity拥有了持久化的能力,增加的这个PersistableBundle参数令这些方法 拥有了系统关机后重启的数据恢复能力!而且不影响我们其他的序列化操作, 具体怎么实现的,暂时还不了解,可能是另外弄了个文件保存吧~!另外,API版本需要>=21,就是要5.0以上的版本才有效

蛮大人123 2019-12-02 02:16:46 0 浏览量 回答数 0

回答

一般我们会搭配两个方法来使用: public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) public void onRestoreInstanceState(Bundle savedInstanceState, PersistableBundle persistentState) 前一个方法会在下述情形中被调用: 点击home键回到主页或长按后选择运行其他程序 按下电源键关闭屏幕 启动新的Activity 横竖屏切换时,肯定会执行,因为横竖屏切换的时候会先销毁Act,然后再重新创建 重要原则:当系统"未经你许可"时销毁了你的activity,则onSaveInstanceState会被系统调用, 这是系统的责任,因为它必须要提供一个机会让你保存你的数据(你可以保存也可以不保存)。 而后一个方法,和onCreate同样可以从取出前者保存的数据: 一般是在onStart()和onResume()之间执行! 之所以有两个可以获取到保存数据的方法,是为了避免Act跳转而没有关闭, 然后不走onCreate()方法,而你又想取出保存数据~ 说回这个Activity拥有了持久化的能力,增加的这个PersistableBundle参数令这些方法 拥有了系统关机后重启的数据恢复能力!!而且不影响我们其他的序列化操作, 具体怎么实现的,暂时还不了解,可能是另外弄了个文件保存吧~!另外,API版本需要>=21,就是要5.0以上的版本才有效~

爵霸 2019-12-02 02:22:52 0 浏览量 回答数 0

问题

关于Android 进程的问题(生命周期)

爵霸 2019-12-01 20:21:47 927 浏览量 回答数 1

回答

public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_HOME) { //在这里把所有的Activity finish() } }

爵霸 2019-12-02 02:48:02 0 浏览量 回答数 0

问题

关于android service的问题

爵霸 2019-12-01 20:16:40 718 浏览量 回答数 1

回答

在app 的你要屏蔽home 键的activity 中,只需要添加该标志就可以了getWindow().addFlags(WindowManager.LayoutParams.FLAG_HOMEKEY_DISPATCHED);如果要使home 键有效,再 clearFlags 即可。getWindow().clearFlags(WindowManager.LayoutParams.FLAG_HOMEKEY_DISPATCHED);从上面的代码来看,应该设置 window 的类型也是有效的,但不知为何在 4.0 中不取作用,打Log 看也不取效。不知何故。this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);

爵霸 2019-12-02 02:49:53 0 浏览量 回答数 0

问题

关于android R文件不更新问题,已勾选自动更新

爵霸 2019-12-01 20:13:20 912 浏览量 回答数 1

问题

关于 学习安卓的过程中,关于SampleAdapter的问题

爵霸 2019-12-01 20:07:59 1036 浏览量 回答数 1

回答

详细说下,先在布局里添加一个button和textview控件,然后在mainactivity里实现点击按钮设置textview的显示内容,个人感觉思路很简单啊,代码也没报错,就是一运行就终止,实在不知其所以然了。以下是代码,注意中间一行我给注释了,不注释就会运行停止。 import android.app.Activity; import android.app.ActionBar; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.Button; import android.widget.TextView; import android.os.Build; public class MainActivity extends Activity { private Button button; private TextView textView; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = (Button)findViewById(R.id.button); textView = (TextView)findViewById(R.id.textview); // button.setOnClickListener(new Buttonlistener()); if (savedInstanceState == null) { getFragmentManager().beginTransaction() .add(R.id.container, new PlaceholderFragment()) .commit(); } } public class Buttonlistener implements OnClickListener{ @Override public void onClick(View arg0) { textView.setText("NIHAO "); } } @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; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } /** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment { public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); return rootView; } } }

蛮大人123 2019-12-02 02:52:13 0 浏览量 回答数 0

问题

java 成员变量无缘无故的变成null,怎么办??报错

爱吃鱼的程序员 2020-06-14 15:45:07 0 浏览量 回答数 1

问题

求不允许app后台运行代码 Android问题

DM。 2020-05-28 13:27:39 10 浏览量 回答数 1

问题

findviewbyid 空指针的问题

爵霸 2019-12-01 19:51:37 819 浏览量 回答数 1

问题

android Launcher setComponent 怎么回到那个APK的状态

爵霸 2019-12-01 20:01:37 878 浏览量 回答数 1

问题

请问android Launcher setComponent 怎么回到那个APK的状态

爵霸 2019-12-01 19:23:30 1014 浏览量 回答数 1

回答

回 1楼(cnblogs) 的帖子 http://home.cnblogs.com/activity/aliyun这个 ------------------------- 回 1楼(cnblogs) 的帖子 现在好了,秒开了 ------------------------- 回 4楼(cnblogs) 的帖子 哦,这样哇。看等待服务器响应用了40多秒。。。我以为又是服务器出问题了呢。

xiao2qiangda 2019-12-02 01:03:02 0 浏览量 回答数 0

问题

程序连接mycat的时候报错,后台数据库采用的是阿里的RDS?报错

爱吃鱼的程序员 2020-06-09 13:55:02 0 浏览量 回答数 1

回答

Re:准备改成按流量交费的形式,但是无法确定服务器流量目前是多少怎么 .. 楼主您好, 这个可能需要安装第三方的软件来为流量计数喔。 您的ECS是什么操作系统呢? ------------------------- 回 3楼(michaelz) 的帖子 您好, 这里介绍了很多款,但我没有使用过。仅供参考: http://studyhat.blogspot.com/2010/10/bandwidth-monitoring-tools-for-centos.html ------------------------- 回 7楼(michaelz) 的帖子 您好, 不好意思,那个网址好象不能直接访问,我复制过来。 BandwidthD tracks usage of TCP/IP network subnets and builds html files with graphs to display utilization. Charts are built by individual IPs, and by default display utilization over 2 day, 8 day, 40 day, and 400 day periods. Furthermore, each ip address’s utilization can be logged out at intervals of 3.3 minutes, 10 minutes, 1 hour or 12 hours in cdf format, or to a backend database server. HTTP, TCP, UDP, ICMP, VPN, and P2P traffic are color coded. Project Home Page :- http://bandwidthd.sourceforge.net/ Bmon bmon is a portable bandwidth monitor and rate estimator running on various operating systems. It supports various input methods for different architectures. Various output modes exist including an interactive curses interface,lightweight HTML output but also formatable ASCII output. Bwbar bwbar is a small C-based program for Linux-based machines which produces bandwidth usage statistics for a network interfaces. It was originally written by H. Peter Anvin, and I (Brian Towne) modified it somewhat to better suit my needs. The original program was released under the GPL. A number of people have asked for the modified program and its source, so I have created this page. bwm This is a very tiny bandwidth monitor (not X11). Can monitor up to 16 interfaces in the in the same time, and shows totals too. bwm-ng small and simple console-based bandwidth monitor.Bandwidth Monitor NG is a small and simple console-based live bandwidth monitor. Project Home Page :- http://www.gropp.org/?id=projects&sub=bwm-ng Cacti Cacti is a complete network graphing solution designed to harness the power of RRDTool’s data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with hundreds of devices. Project Home Page :- http://cacti.net/ cbm cbm — the color bandwidth meter — is a small program to display the traffic currently flowing through your network devices. dstat Dstat is a versatile replacement for vmstat, iostat, netstat, nfsstat and ifstat. Dstat overcomes some of their limitations and adds some extra features, more counters and flexibility. Dstat is handy for monitoring systems during performance tuning tests, benchmarks or troubleshooting. Project Home Page :- http://dag.wieers.com/home-made/dstat/ EtherApe EtherApe is a graphical network monitor for Unix modeled after etherman. Featuring link layer, ip and TCP modes, it displays network activity graphically. Hosts and links change in size with traffic. Color coded protocols display. Project Home Page :- http://etherape.sourceforge.net/ gdesklets gDesklets is a system for bringing mini programs (desklets), such as weather forecasts, news tickers, system information displays, or music player controls, onto your desktop, where they are sitting there in a symbiotic relationship of eye candy and usefulness. The possibilities are really endless and they are always there to serve you whenever you need them, just one key-press away. The system is not restricted to one desktop environment, but currently works on most of the modern Unix desktops (including GNOME, KDE, Xfce). Project Home Page :- http://www.gdesklets.de/ GKrellM GKrellM is a single process stack of system monitors which supports applying themes to match its appearance to your window manager, Gtk, or any other theme. Project Home Page :- http://members.dslextreme.com/users/billw/gkrellm/gkrellm.html ipband ipband is a pcap based IP traffic monitor. It tallies per-subnet traffic and bandwidth usage and starts detailed logging if specified threshold for the specific subnet is exceeded. If traffic has been high for a certain period of time, the report for that subnet is generated which can be appended to a file or e-mailed. When bandwidth usage drops below the threshold, detailed logging for the subnet is stopped and memory is freed. Project Home Page :- http://ipband.sourceforge.net/ iftop iftop does for network usage what top does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. Handy for answering the question “why is our ADSL link so slow”. Project Home Page :- http://www.ex-parrot.com/pdw/iftop/ iperf Iperf is a tool to measure maximum TCP bandwidth, allowing the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss. ipfm IP Flow Meter (IPFM) is a bandwidth analysis tool, that measures how much bandwidth specified hosts use on their Internet link. Project Home Page :- http://robert.cheramy.net/ipfm/ ifstat ifstat is a tool to report network interfaces bandwith just like vmstat/iostat do for other system counters. Project Home Page :- http://gael.roualland.free.fr/ifstat/ ibmonitor ibmonitor is an interactive linux console application which shows bandwidth consumed and total data transferred on all interfaces. Project Home Page :- http://ibmonitor.sourceforge.net/ ipaudit IPAudit monitors network activity on a network by host, protocol and port.IPAudit listens to a network device in promiscuous mode, and records every connection between two ip addresses. A unique connection is determined by the ip addresses of the two machines, the protocol used between them, and the port numbers (if they are communicating via udp or tcp). Project Home Page :- http://ipaudit.sourceforge.net/ IPTraf IPTraf is a console-based network statistics utility for Linux. It gathers a variety of figures such as TCP connection packet and byte counts, interface statistics and activity indicators, TCP/UDP traffic breakdowns, and LAN station packet and byte counts. Project Home Page :- http://iptraf.seul.org/ IFStatus IFStatus was developed for Linux users that are usually in console mode. It is a simple, easy to use program for displaying commonly needed / wanted statistics in real time about ingoing and outgoing traffic of multiple network interfaces that is usually hard to find, with a simple and effecient view. It is the substitute for PPPStatus and EthStatus projects. jnettop Jnettop is a traffic visualiser, which captures traffic going through the host it is running from and displays streams sorted by bandwidth they use. Project Home Page :- http://jnettop.kubs.info/wiki/ MRTG The Multi Router Traffic Grapher (MRTG) is a tool to monitor the traffic load on network links. MRTG generates HTML pages containing PNG images which provide a LIVE visual representation of this traffic. Project Home Page :- http://oss.oetiker.ch/mrtg/ moodss moodss is a graphical monitoring application. It is modular so that the code accessing the monitored objects is completely separate from the application core. The core takes care of managing modules (loading and unloading),displaying modules data through sortable tables and diverse graphical viewers, handling user set threshold conditions with email alerts, recording and browsing data history from a database.moodss can even predict the future, using sophisticated statistical methods and artificial neural networks, and therefore be used for capacity planning. Project Home Page :- http://moodss.sourceforge.net/ monitord A lightweight (distributed?) network security monitor for TCP/IP+Ethernet LANs. It will capture certain network events and record them in a relational database. The recorded data will be available for analysis through a CGI based interface. Project Home Page :- http://sourceforge.net/projects/monitord/ Netmrg NetMRG is a tool for network monitoring, reporting, and graphing. Based on RRDTOOL, the best of open source graphing systems, NetMRG is capable of creating graphs of any parameter of your network. Project Home Page :- http://www.netmrg.net nload nload is a console application which monitors network traffic and bandwidth usage in real time. It visualizes the in-and outgoing traffic using two graphs and provides additional info like total amount of transfered data and min/max network usage. Project Home Page :- http://www.roland-riegel.de/nload/index.html ntop ntop shows the current network usage. It displays a list of hosts that are currently using the network and reports information concerning the IP (Internet Protocol) and Fibre Channel (FC) traffic generated by each host. The traffic is sorted according to host and protocol. Default protocol list (this is user configurable). Project Home Page :- http://www.ntop.org netspeed Netspeed is just a little GNOME-applet that shows how much traffic occurs on a specified network device (for example eth0). You get the best impression of it, if you look at the screenshots below. Netwatch Netwatch is a Linux program created to aid in monitoring Network Connections. It is based on a program called “statnet” but has been substantially modified for its Ethernet emphasis. It is a dynamic program which displays the Ethernet status based each the connection’s activity. It has the capability of monitoring hundreds of site statistics simultaneously. The connection’s port number (Well Known Service) and destination address are available as well. There are options which allow router statistics to be measured on simple networks (with one router). External network communication is counted and transfer rates are displayed. Project Home Page :- http://www.slctech.org/~mackay/netwatch.html NOCOL NOCOL is a popular system and network monitoring (network management) software that runs on Unix systems and can monitor network and system devices. It uses a very simple architecture and is very flexible for adding new network management modules Project Home Page :- http://www.netplex-tech.com/nocol/ NeTraMet NeTraMet is an open-source (GPL) implementation of the RTFM architecture for Network Traffic Flow Measurement, developed and supported by Nevil Brownlee at the University of Auckland. Nevil also developed a version of NeTraMet which uses the CoralReef library to read packet headers. This ‘CoralReef NeTraMet meter’ can work with any CoralReef data source; it has been tested on both CAIDA and NLANR trace files, and on DAG and Apptel ATM interface cards. Project Home Page :- http://freshmeat.net/projects/netramet/ NetPIPE NetPIPE is a protocol independent performance tool that visually represents the network performance under a variety of conditions. It performs simple ping-pong tests, bouncing messages of increasing size between two processes, whether across a network or within an SMP system. Message sizes are chosen at regular intervals, and with slight perturbations, to provide a complete test of the communication system. Each data point involves many ping-pong tests to provide an accurate timing. Latencies are calculated by dividing the round trip time in half for small messages ( <64 Bytes ). Project Home Page :- http://www.scl.ameslab.gov/netpipe/ netperf Netperf is a benchmark that can be use to measure various aspect of networking performance. The primary foci are bulk (aka unidirectional) data transfer and request/response performance using either TCP or UDP and the Berkeley Sockets interface. As of this writing, the tests available either unconditionally or conditionally Project Home Page :- http://www.netperf.org/netperf/ potion This is a console utility which will listen on an interface using libpcap, aggregate the traffic into flows and display the top (as many as can fit on your screen) flows with their average throughput. A flow is identified ip protocol, source ip, source port, destination ip, destination port, and type of service flag. pktstat Display a real-time list of active connections seen on a network interface, and how much bandwidth is being used by what. Partially decodes HTTP and FTP protocols to show what filename is being transferred. X11 application names are also shown. Entries hang around on the screen for a few seconds so you can see what just happened. Also accepts filter expressions á la tcpdump. Project Home Page :- http://www.adaptive-enterprises.com.au/~d/software/pktstat/ RTG RTG is a flexible, scalable, high-performance SNMP statistics monitoring system. It is designed for enterprises and service providers who need to collect time-series SNMP data from a large number of targets quickly. All collected data is inserted into a relational database that provides a common interface for applications to generate complex queries and reports. RTG includes utilities that generate configuration and target files, traffic reports, 95th percentile reports and graphical data plots. These utilities may be used to produce a web-based interface to the data. Project Home Page :- http://rtg.sourceforge.net/ speedometer Monitor network traffic or speed/progress of a file transfer. The program can be used for cases like: how long it will take for my 38MB transfer to finish, how quickly is another transfer going, How fast is the upstream on this ADSL line and how fast can I write data to my filesystem. Project Home Page :- http://excess.org/speedometer/ Spong Spong is a simple system-monitoring package written in Perl. It features client based monitoring, monitoring of network services, results displayed via the Web or console, history of problems, and flexible messaging when problems occur. Project Home Page :- http://spong.sourceforge.net/ slurm slurm started as a pppstatus port to FreeBSD. As I ripped off several functions SNIPS SNIPS (System & Network Integrated Polling Software) is a system and network monitoring software that runs on Unix systems and can monitor network and system devices. It is capable of monitoring DNS, NTP, TCP or web ports, host performance, syslogs, radius servers, BGP peers, etc. New monitors can be added easily (via a C or Perl API). Project Home Page :- http://www.navya.com/software/snips/ tcpflow tcpflow is a program that captures data transmitted as part of TCP connections (flows), and stores the data in a way that is convenient for protocol analysis or debugging. A program like tcpdump shows a summary of packets seen on the wire, but usually doesn’t store the data that’s actually being transmitted. In contrast, tcpflow reconstructs the actual data streams and stores each flow in a separate file for later analysis. tcpflow understands TCP sequence numbers and will correctly reconstruct data streams regardless of retransmissions or out-of-order delivery. Project Home Page :- http://www.circlemud.org/~jelson/software/tcpflow/ vnstat vnStat is a network traffic monitor for Linux that keeps a log of daily network traffic for the selected interface(s).vnStat isn’t a packet sniffer. The traffic information is analyzed from the /proc -filesystem, so vnStat can be used without root permissions. However at least a 2.2.x kernel is required. Project Home Page :- http://humdi.net/vnstat/ WMND Shows a graph of incoming/outgoing traffic, activity indicators for rx/tx and current/maximum rate for rx/tx in bytes or packets.Tailored for use with WindowMaker, it will as well work with any other window manager though. Project Home Page :- http://dockapps.org/file.php/id/178

dongshan8 2019-12-02 02:20:45 0 浏览量 回答数 0

问题

java.lang.NullPointerException:尝试在空对象引用上调用接口方法

montos 2020-03-27 16:18:07 0 浏览量 回答数 1
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