launcher

JVM-双亲委派机制

由 我们两清 提交于 2019-12-27 05:07:51
JVM-双亲委派机制 双亲委派的好处 了解双亲委派之前先说一下双亲委派的 好处 ： 1.主要是为了安全性，避免用户自己编写的类动态替换Java的一些核心类，比如Spring 2.避免类的重复加载，因为JVM中区分不同类，不仅仅根据类名，相同的class文件被不同的ClassLoader加载就是不同的两个类 双亲委派 虚拟机提供了3种类加载器，引导（Bootstrap）类加载器、扩展（Extension）类加载器、应用类加载器，以及父类加载器为AppClassLoader的自定义类加载器。 在Launcher中实现： 1.启动类加载器 启动类加载器主要加载的是JVM自身需要的类，这个类加载使用C++语言实现，是虚拟机自身的一部分，他负责将/lib路径下的核心类库或-Xbootclasspath参数指定路径下的jar包加载到内存中。注意由于虚拟机是按照文件名识别加载jar包的，如果文件名不被虚拟机识别，即使吧jar包丢到lib目录下也是没有用的（处于安全考虑Bootstrap启动类加载器只加载包名为java、javax。sun等开头的）。 2.扩展类加载器 扩展类加载器是指Sun公司（以被Oracle收购）实现的sun.misc.Launcher$ExtClassLoader类，由java语言实现的，是Launcher的静态内部类，它负责加载/lib/ext目录下或者由系统变量

How do i declare my Activity as Launcher?

由 对着背影说爱祢 提交于 2019-12-25 18:23:09
问题 I am trying to build a kind of custom lockscreen. In order to achieve that I need to disable the HOME button. From this post I understand that I can achieve that by declaring my Activity as a Launcher. Please how do I do that? (it is in the Manifest obviously) This is the Manifest. The Activity that "acts" as a lockscreen is LockScreen <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.appengine.paranoid_android.lost"

Python waiting error

由 吃可爱长大的小学妹 提交于 2019-12-25 16:46:13
问题 I tried to find a good code line for making python wait before executing the next code block, but nothing I found worked. Here is a sample of the code below: #This is the eighth Question. print "Q8. What is one of the main bosses in 'Super Smash Brothers Brawl' that is also a boss in 'Kirby the Amazing Mirror?'" print "1) Krazy hand." print "2) Mister hand." print "3) Ganondorf." print "4) Yoshi." choice = input("Answer=") if choice ==1: print "THAT IS INCORRECT! 'Krazy hand' is SUPPOSED to

Replacing default Home Screen Android

由 非 Y 不嫁゛ 提交于 2019-12-25 12:44:36
问题 in my application I achieved the resul that my app is one of the Home Activity that start when my tablet start. The code in the android Manifest is the Following: <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.HOME" /> <category android:name="android.intent.category.DEFAULT" /> The result that i want to achieve is that the user cannot choose if the first activity to start should be the mine activity or the default home activity. I would to

java与javac版本不一致问题

由 ﹥＞﹥吖頭↗ 提交于 2019-12-24 20:59:35
编译的时候 中出现如下异常： Exception in thread "main" Java .lang.UnsupportedClassVersionError: org/apache/ma ven/cli/MavenCli : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14 1) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java

Android 2.3.3 (Windows) emulator doesn't show the phone desktop on startup. Getting a repeated Launcher (com.android.launcher) error

由 空扰寡人 提交于 2019-12-24 15:55:52
问题 When I try to run the Android 2.3.3 emulator, the phone desktop doesn't show. Instead, this error message keeps popping up : The Application Launcher (process com.android.launcher) has stopped unexpectedly. Please try again. I keep force-closing it but it just keeps popping up. However, any application that I try to run (I'm using Eclipse Helios for my IDE) runs fine in the background. How do I get around this? 回答1: you could look into the console view in eclipse. or you could call platform

Get the count of the latest statusbar notifications in Android

由 ♀尐吖头ヾ 提交于 2019-12-24 06:40:45
问题 I have a Google TV and find the Home app can display the count of the latest statusbar notifications. Does anyone know how to implements this function? 回答1: You cannot get the count of notifications sent from other apps in Android. Only system apps can do that. You could keep track of the number of notifications that your app is sending but I don't think that is what you are looking for. 来源： https://stackoverflow.com/questions/10996849/get-the-count-of-the-latest-statusbar-notifications-in

Set WM_CLASS (with wnck, xprop, or something else)

由 ぐ巨炮叔叔 提交于 2019-12-24 05:49:32
问题 I'm trying to group multiple Chrome standalone windows under the same launcher in Ubuntu 14.04. It doesn't seem to be possible simply to specify multiple WM_CLASS variables in the .desktop file (see comments on this answer). The first solution I hit on is to use xprop to change the WM_CLASS of the extra windows to be the same as a chosen master window, after a short delay. This works if I don't specify which window to change at the command line, let it give me a crosshair, and click on the

Android - Show last viewed Activity When press (Home Button-->App Shortcut)

由 自闭症网瘾萝莉.ら 提交于 2019-12-24 02:38:17
问题 I came to do the eternal question, which so far have not found a solution, I searched on the internet the same problem but found a final solution to this problem. when I have 2 activities open and I pull the 'Home Button' and then press the shortcut for my application, it shows me again the first activity (the launcher activity), and then to return to the activity that was displayed, I have to press the back button. what is the solution to this problem? I want to press the shortcut of my

Two shortcut with Two Icons for the same App

由 回眸只為那壹抹淺笑 提交于 2019-12-23 23:43:28
问题 So , i want to have an additional Shortcut with another Icon for the same App , this additional Shortcut , Visible in App Drawer , should launch a Simple Activity/Service , it is Possible , If yes How ? If Possible , Programmaticly , Does its matter with < application > Tag ? , Thanks 回答1: Of course you can have two or more launcher activities in your application. Just set an intent filter with launch attributes. <activity android:name=".SecondActivity" android:icon="@drawable/ic_second
订阅 launcher