measurement

问题 I have next view hiererchy: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:paddingLeft="10dp" android:paddingRight="10dp" android:gravity="center"> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="@drawable/group_bg" android:gravity="center_vertical" android:baselineAligned="false"> <LinearLayout android:id="@+id/itemplace" android

问题 I'm using this: int wi=getWindowManager().getDefaultDisplay().getWidth(); to get the screen size in pixels. Is there a way to get the screen size in dpi ??? I'm doing this to select different layouts base on the screen size. 回答1: Is there a way to get the escreen size in dpi??? DisplayMetrics can tell you the screen size in pixels, plus the screen density. From there, you can calculate the screen size in dp . I'm doing this to select different layouts base on the screen size. This is

问题 I've been using the Measurement object to convert from mostly lengths. But I have a strange issue. If I convert from miles to feet I get almost the right answer. import Foundation let heightFeet = Measurement(value: 6, unit: UnitLength.feet) // 6.0ft let heightInches = heightFeet.converted(to: UnitLength.inches) // 72.0 in let heightMeters = heightFeet.converted(to: UnitLength.meters) // 1.8288 m let lengthMiles = Measurement(value: 1, unit: UnitLength.miles) // 1.0 mi let lengthFeet =

问题 I would like to analyze battery usage of my application, I mean the parts of the app, such as broadcastreceivers, listeners, services, etc.., how much battery uses. I need a detailed list, and from the list, I would like to optimize battery usage. Method would be similar than using Memory Analyzer (http://android-developers.blogspot.hu/2011/03/memory-analysis-for-android.html) Is there any tool for it? I used some battery tracking app from PlayStore, but global battery usage of application is

问题 Assuming a single machine with 8 cores. In Haskell, you can compile using the threaded option, then during runtime use +RTS -Nx to specify the number of cores to be used. e.g. $ myprg args // sequential run $ myprg args +RTS -N1 // parallel run on 1..8 cores $ myprg args +RTS -N2 $ myprg args +RTS -N4 $ myprg args +RTS -N8 From this, you get the runtimes using increasing number of cores, which you can then use to get speedups and plot a graph. How would you do this in F#, assuming I have a

问题 I'm new to the language F# and currently I'm doing a short study on the F# performance. So what I would like to do is benchmark my F# code. I've already found the Stopwatch class, which was pretty obvious, but as for the rest of what you should be able to test, I found no clear leads. What I would wish to do is to find out memory and cpu usage of the F# code when I run it. Is there anyone here that might be able to give me some advices on how to do this? 回答1: For quick prototyping, fsi's

问题 Can we find the internet bandwidth from the time it takes to ping a server if yes how is it done 回答1: No, ping tells you nothing about the bandwidth, it just measures latency. Measuring bandwidth is best done by a dedicated test, i.e. transferring a bunch of bits and measuring how long time it takes. You might want to consider that the bandwidth can vary dramatically with many factors, such as: Direction; A to B might be faster than B to A, or vice versa Time of day; depending on general load

问题 Can we find the internet bandwidth from the time it takes to ping a server if yes how is it done 回答1: No, ping tells you nothing about the bandwidth, it just measures latency. Measuring bandwidth is best done by a dedicated test, i.e. transferring a bunch of bits and measuring how long time it takes. You might want to consider that the bandwidth can vary dramatically with many factors, such as: Direction; A to B might be faster than B to A, or vice versa Time of day; depending on general load

问题 I've an Android app where user has to register. On sending registration, I want to send the parameters from the PlayStore (utm_source, etc.) to know from which campaign user comes from. So the idea was to use a own BroadcastReceiver for INSTALL_REFERRER, where I save parameters to a file. When user registers i will read the file and send the content. So I made receiver: public class CampaignBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent

问题 I'm currently using VisualVM , but the problem I'm having is that I can't save the graphs it generates. I need to report some data about its memory usage and running time, though running time is easy to get with System.nanoTime() . I've also tried the NetBeans profiler but it isn't what I want, since I'm not looking for specific parts that would be slowing it down or anything, so that would be overkill. The biggest problem with it is that it eats up too much processing time. Also doesn't let